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Ivo Labbe - One of the best experts on this subject based on the ideXlab platform.
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first frontier Field constraints on the cosmic star formation rate density at z 10 the impact of lensing shear on completeness of high redshift galaxy samples
The Astrophysical Journal, 2015Co-Authors: P A Oesch, R J Bouwens, Garth D Illingworth, Marijn Franx, S M Ammons, P G Van Dokkum, Michele Trenti, Ivo LabbeAbstract:We search the complete Hubble Frontier Field data set of Abell 2744 and its Parallel Field for sources to further refine the evolution of the cosmic star formation rate density (SFRD) between and . We independently confirm two images of the recently discovered triply imaged source by Zitrin et al. and set an upper limit for similar galaxies with red colors of in the Parallel Field of Abell 2744. We utilize extensive simulations to derive the effective selection volume of Lyman-break galaxies at , both in the lensed cluster Field and in the adjacent Parallel Field. Particular care is taken to include position-dependent lensing shear to accurately account for the expected sizes and morphologies of highly magnified sources. We show that both source blending and shear reduce the completeness at a given observed magnitude in the cluster, particularly near the critical curves. These effects have a significant, but largely overlooked, impact on the detectability of high-redshift sources behind clusters, and substantially reduce the expected number of highly magnified sources. The detections and limits from both pointings result in an SFRD which is consistent within the uncertainties with previous estimates at from blank Fields. The combination of these new results with all other estimates is also consistent with a rapidly declining SFRD in the 170 Myr from to as predicted by cosmological simulations and dark-matter halo evolution in ?CDM. Once biases introduced by magnification-dependent completeness are accounted for, the full six cluster and Parallel Frontier Field program will be an extremely powerful new data set to probe the evolution of the galaxy population at before the advent of the James Webb Space Telescope.
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first frontier Field constraints on the cosmic star formation rate density at z 10 the impact of lensing shear on completeness of high redshift galaxy samples
The Astrophysical Journal, 2015Co-Authors: P A Oesch, R J Bouwens, Garth D Illingworth, Marijn Franx, S M Ammons, P G Van Dokkum, Michele Trenti, Ivo LabbeAbstract:We search the complete Hubble Frontier Field data set of Abell 2744 and its Parallel Field for z ∼ 10 sources to further refine the evolution of the cosmic star formation rate density (SFRD) between z ∼ 8 and z ∼ 10. We independently confirm two images of the recently discovered triply imaged z ∼ 9.8 source by Zitrin et al. and set an upper limit for similar z ∼ 10 galaxies with red colors of J - H 1.2 in the Parallel Field of Abell 2744. We utilize extensive simulations to derive the effective selection volume of Lyman-break galaxies at z ∼ 10, both in the lensed cluster Field and in the adjacent Parallel Field. Particular care is taken to include position-dependent lensing shear to accurately account for the expected sizes and morphologies of highly magnified sources. We show that both source blending and shear reduce the completeness at a given observed magnitude in the cluster, particularly near the critical curves. These effects have a significant, but largely overlooked, impact on the detectability of high-redshift sources behind clusters, and substantially reduce the expected number of highly magnified sources. The detections and limits from both pointings result in an SFRD which is consistent within the uncertainties with previous estimates at z ∼ 10 from blank Fields. The combination of these new results with all other estimates is also consistent with a rapidly declining SFRD in the 170 Myr from z ∼ 8 to z ∼ 10 as predicted by cosmological simulations and dark-matter halo evolution in as predicted by cosmological simulations and dark-matter halo evolution in ΛCDM. Once biases introduced by magnification-dependent completeness are accounted for, the full six cluster and Parallel Frontier Field program will be an extremely powerful new data set to probe the evolution of the galaxy population at z > 8 before the advent of the James Webb Space Telescope. 125 160
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first frontier Field constraints on the cosmic star formation rate density at z 10 the impact of lensing shear on completeness of high redshift galaxy samples
arXiv: Astrophysics of Galaxies, 2014Co-Authors: P A Oesch, R J Bouwens, Garth D Illingworth, Marijn Franx, S M Ammons, P G Van Dokkum, Michele Trenti, Ivo LabbeAbstract:We search the complete Hubble Frontier Field dataset of Abell 2744 and its Parallel Field for z~10 sources to further refine the evolution of the cosmic star-formation rate density (SFRD) at z>8. We independently confirm two images of the recently discovered triply-imaged z~9.8 source by Zitrin et al. (2014) and set an upper limit for similar z~10 galaxies with red colors of J_125-H_160>1.2 in the Parallel Field of Abell 2744. We utilize extensive simulations to derive the effective selection volume of Lyman-break galaxies at z~10, both in the lensed cluster Field and in the adjacent Parallel Field. Particular care is taken to include position-dependent lensing shear to accurately account for the expected sizes and morphologies of highly-magnified sources. We show that both source blending and shear reduce the completeness at a given observed magnitude in the cluster, particularly near the critical curves. These effects have a significant, but largely overlooked, impact on the detectability of high-redshift sources behind clusters, and substantially reduce the expected number of highly-magnified sources. The detections and limits from both pointings result in a SFRD which is higher by 0.4+-0.4 dex than previous estimates at z~10 from blank Fields. Nevertheless, the combination of these new results with all other estimates remain consistent with a rapidly declining SFRD in the 170 Myr from z~8 to z~10 as predicted by cosmological simulations and dark-matter halo evolution in LambdaCDM. Once biases introduced by magnification-dependent completeness are accounted for, the full six cluster and Parallel Frontier Field program will be an extremely powerful new dataset to probe the evolution of the galaxy population at z>8 before the advent of the JWST.
P A Oesch - One of the best experts on this subject based on the ideXlab platform.
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first frontier Field constraints on the cosmic star formation rate density at z 10 the impact of lensing shear on completeness of high redshift galaxy samples
The Astrophysical Journal, 2015Co-Authors: P A Oesch, R J Bouwens, Garth D Illingworth, Marijn Franx, S M Ammons, P G Van Dokkum, Michele Trenti, Ivo LabbeAbstract:We search the complete Hubble Frontier Field data set of Abell 2744 and its Parallel Field for sources to further refine the evolution of the cosmic star formation rate density (SFRD) between and . We independently confirm two images of the recently discovered triply imaged source by Zitrin et al. and set an upper limit for similar galaxies with red colors of in the Parallel Field of Abell 2744. We utilize extensive simulations to derive the effective selection volume of Lyman-break galaxies at , both in the lensed cluster Field and in the adjacent Parallel Field. Particular care is taken to include position-dependent lensing shear to accurately account for the expected sizes and morphologies of highly magnified sources. We show that both source blending and shear reduce the completeness at a given observed magnitude in the cluster, particularly near the critical curves. These effects have a significant, but largely overlooked, impact on the detectability of high-redshift sources behind clusters, and substantially reduce the expected number of highly magnified sources. The detections and limits from both pointings result in an SFRD which is consistent within the uncertainties with previous estimates at from blank Fields. The combination of these new results with all other estimates is also consistent with a rapidly declining SFRD in the 170 Myr from to as predicted by cosmological simulations and dark-matter halo evolution in ?CDM. Once biases introduced by magnification-dependent completeness are accounted for, the full six cluster and Parallel Frontier Field program will be an extremely powerful new data set to probe the evolution of the galaxy population at before the advent of the James Webb Space Telescope.
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first frontier Field constraints on the cosmic star formation rate density at z 10 the impact of lensing shear on completeness of high redshift galaxy samples
The Astrophysical Journal, 2015Co-Authors: P A Oesch, R J Bouwens, Garth D Illingworth, Marijn Franx, S M Ammons, P G Van Dokkum, Michele Trenti, Ivo LabbeAbstract:We search the complete Hubble Frontier Field data set of Abell 2744 and its Parallel Field for z ∼ 10 sources to further refine the evolution of the cosmic star formation rate density (SFRD) between z ∼ 8 and z ∼ 10. We independently confirm two images of the recently discovered triply imaged z ∼ 9.8 source by Zitrin et al. and set an upper limit for similar z ∼ 10 galaxies with red colors of J - H 1.2 in the Parallel Field of Abell 2744. We utilize extensive simulations to derive the effective selection volume of Lyman-break galaxies at z ∼ 10, both in the lensed cluster Field and in the adjacent Parallel Field. Particular care is taken to include position-dependent lensing shear to accurately account for the expected sizes and morphologies of highly magnified sources. We show that both source blending and shear reduce the completeness at a given observed magnitude in the cluster, particularly near the critical curves. These effects have a significant, but largely overlooked, impact on the detectability of high-redshift sources behind clusters, and substantially reduce the expected number of highly magnified sources. The detections and limits from both pointings result in an SFRD which is consistent within the uncertainties with previous estimates at z ∼ 10 from blank Fields. The combination of these new results with all other estimates is also consistent with a rapidly declining SFRD in the 170 Myr from z ∼ 8 to z ∼ 10 as predicted by cosmological simulations and dark-matter halo evolution in as predicted by cosmological simulations and dark-matter halo evolution in ΛCDM. Once biases introduced by magnification-dependent completeness are accounted for, the full six cluster and Parallel Frontier Field program will be an extremely powerful new data set to probe the evolution of the galaxy population at z > 8 before the advent of the James Webb Space Telescope. 125 160
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first frontier Field constraints on the cosmic star formation rate density at z 10 the impact of lensing shear on completeness of high redshift galaxy samples
arXiv: Astrophysics of Galaxies, 2014Co-Authors: P A Oesch, R J Bouwens, Garth D Illingworth, Marijn Franx, S M Ammons, P G Van Dokkum, Michele Trenti, Ivo LabbeAbstract:We search the complete Hubble Frontier Field dataset of Abell 2744 and its Parallel Field for z~10 sources to further refine the evolution of the cosmic star-formation rate density (SFRD) at z>8. We independently confirm two images of the recently discovered triply-imaged z~9.8 source by Zitrin et al. (2014) and set an upper limit for similar z~10 galaxies with red colors of J_125-H_160>1.2 in the Parallel Field of Abell 2744. We utilize extensive simulations to derive the effective selection volume of Lyman-break galaxies at z~10, both in the lensed cluster Field and in the adjacent Parallel Field. Particular care is taken to include position-dependent lensing shear to accurately account for the expected sizes and morphologies of highly-magnified sources. We show that both source blending and shear reduce the completeness at a given observed magnitude in the cluster, particularly near the critical curves. These effects have a significant, but largely overlooked, impact on the detectability of high-redshift sources behind clusters, and substantially reduce the expected number of highly-magnified sources. The detections and limits from both pointings result in a SFRD which is higher by 0.4+-0.4 dex than previous estimates at z~10 from blank Fields. Nevertheless, the combination of these new results with all other estimates remain consistent with a rapidly declining SFRD in the 170 Myr from z~8 to z~10 as predicted by cosmological simulations and dark-matter halo evolution in LambdaCDM. Once biases introduced by magnification-dependent completeness are accounted for, the full six cluster and Parallel Frontier Field program will be an extremely powerful new dataset to probe the evolution of the galaxy population at z>8 before the advent of the JWST.
Matthieu Schaller - One of the best experts on this subject based on the ideXlab platform.
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setting the scene for buffalo a study of the matter distribution in the hff galaxy cluster macs j0416 1 2403 and its Parallel Field
Monthly Notices of the Royal Astronomical Society, 2020Co-Authors: Charles L Steinhardt, J Remolina D Gonzalez, J M Diego, Thomas Connor, Douglas Clowe, David J Barnes, A M Koekemoer, Anna Niemiec, David Harvey, Matthieu SchallerAbstract:In the context of the Beyond Ultradeep Frontier Fields And Legacy Observations (BUFFALO) survey, we present a new analysis of the merging galaxy cluster MACS J0416.1−2403 (z = 0.397) and its Parallel Field using Hubble Frontier Fields (HFF) data. We measure the surface mass density from a weak-lensing analysis and characterize the overall matter distribution in both the cluster and Parallel Fields. The surface mass distribution derived for the Parallel Field shows clumpy overdensities connected by filament-like structures elongated in the direction of the cluster core. We also characterize the X-ray emission in the Parallel Field and compare it with the lensing mass distribution. We identify five mass peaks at the >5σ level over the two Fields, four of them being in the cluster one. Three of them are located close to galaxy overdensities and one is also close to an excess in the X-ray emission. Nevertheless, two of them have neither optical nor X-ray counterpart and are located close to the edges of the Field of view, thus further studies are needed to confirm them as substructures. Finally, we compare our results with the predicted subhalo distribution of one of the Hydrangea/C-EAGLE simulated cluster. Significant differences are obtained suggesting the simulated cluster is at a more advanced evolutionary stage than MACS J0416.1−2403. Our results anticipate the upcoming BUFFALO observations that will link the two HFF Fields, extending further the HST coverage.
Hakim Atek - One of the best experts on this subject based on the ideXlab platform.
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are ultra faint galaxies at z 6 8 responsible for cosmic reionization combined constraints from the hubble frontier Fields clusters and Parallels
The Astrophysical Journal, 2015Co-Authors: Hakim Atek, Johan Richard, Mathilde Jauzac, J P Kneib, Priyamvada Natarajan, Marceau Limousin, Daniel Schaerer, Eric Jullo, H EbelingAbstract:We use deep Hubble Space Telescope imaging of the Frontier Fields to accurately measure the galaxy rest-frame ultraviolet luminosity function (UV LF) in the redshift range z ∼ 6–8. We combine observations in three lensing clusters, A2744, MACS 0416, and MACS 0717, and their associated ParallelFields to select high-redshift dropout candidates. We use the latest lensing models to estimate the flux magnification and the effective survey volume in combination with completeness simulations performed in the source plane. We report the detection of 227 galaxy candidates at z = 6–7 and 25 candidates at z ∼ 8. While the total survey area is about 4 arcmin 2 in each Parallel Field, it drops to about 0.6–1 arcmin 2 in the cluster core Fields because of the strong lensing. We compute the UV LF at z ∼ 7 using the combined galaxy sample and perform Monte Carlo simulations to determine the best-fit Schechter parameters. We are able to reliably constrain the LF down to an absolute magnitude of M UV = −15.25, which corresponds to 0.005 L a. More importantly, we find that the faint-end slope remains steep down to this magnitude limit with 2.04. 0.17 0.13 a =-+ We find a characteristic magnitude of M 20.89 0.72 0.60 =-+ and log (f a) = 3.54. 0.45 0.48-+ Our results confirm the most recent results in deep blank Fields but extend the LF measurements more than two magnitudes deeper. The UV LF at z ∼ 8 is not very well constrained below M UV = −18 owing to the small number statistics and incompleteness uncertainties. To assess the contribution of galaxies to cosmic reionization, we derive the UV luminosity density at z ∼ 7 by integrating the UV LF down to an observational limit of M UV = −15. We show that our determination of log(ρ UV) = 26.2 ± 0.13 (erg s −1 Hz −1 Mpc −3) can be sufficient to maintain reionization with an escape fraction of ionizing radiation of f esc = 10%–15%. Future Hubble Frontier Fields observations will certainly improve the constraints on the UV LF at the epoch of reionization, paving the way to more ambitious programs using cosmic telescopes with the next generation of large aperture telescopes such as the James Webb Space Telescope and the European Extremely Large Telescope.
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are ultra faint galaxies at z 6 8 responsible for cosmic reionization combined constraints from the hubble frontier Fields clusters and Parallels
arXiv: Astrophysics of Galaxies, 2015Co-Authors: Hakim Atek, Johan Richard, Mathilde Jauzac, J P Kneib, Priyamvada Natarajan, Marceau Limousin, Daniel Schaerer, Eric Jullo, H EbelingAbstract:We use deep Hubble Space Telescope imaging of the Frontier Fields to accurately measure the galaxy rest-frame ultraviolet luminosity function (UV LF) in the redshift range $z \sim 6-8$. We combine observations in three lensing clusters A2744, MACS0416, MACS0717 and their associated Parallels Fields to select high-redshift dropout candidates. We use the latest lensing models to estimate the flux magnification and the effective survey volume in combination with completeness simulations performed in the source plane. We report the detection of 227 galaxy candidates at $z=6-7$ and 25 candidates at $z \sim 8$. While the total survey area is about 4 arcmin$^{2}$ in each Parallel Field, it drops to about 0.6 to 1 arcmin$^{2}$ in the cluster core Fields because of the strong lensing. We compute the UV luminosity function at $z \sim 7$ using the combined galaxy sample and perform Monte Carlo simulations to determine the best fit Schechter parameters. We are able to reliably constrain the LF down to an absolute magnitude of $M_{UV}=-15.25$, which corresponds to 0.005$L^{\star}$. More importantly, we find that the faint-end slope remains steep down to this magnitude limit with $\alpha=-2.04_{-0.17}^{+0.13}$. Our results confirm the most recent results in deep blank Fields but extend the LF measurements more than two magnitudes deeper. The UV LF at $z \sim 8$ is not very well constrained below $M_{UV}=-18$ due to the small number statistics and incompleteness uncertainties. To assess the contribution of galaxies to cosmic reionization we derive the UV luminosity density at $z\sim7$ by integrating the UV LF down to an observationally constrained limit of $M_{UV} = -15$. We show that our determination of Log($\rho_{UV}$)=$26.2\pm0.13$ (erg s$^{-1}$ Hz$^{-1}$ Mpc$^{-3}$) can be sufficient to maintain the IGM ionized.
R J Bouwens - One of the best experts on this subject based on the ideXlab platform.
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first frontier Field constraints on the cosmic star formation rate density at z 10 the impact of lensing shear on completeness of high redshift galaxy samples
The Astrophysical Journal, 2015Co-Authors: P A Oesch, R J Bouwens, Garth D Illingworth, Marijn Franx, S M Ammons, P G Van Dokkum, Michele Trenti, Ivo LabbeAbstract:We search the complete Hubble Frontier Field data set of Abell 2744 and its Parallel Field for sources to further refine the evolution of the cosmic star formation rate density (SFRD) between and . We independently confirm two images of the recently discovered triply imaged source by Zitrin et al. and set an upper limit for similar galaxies with red colors of in the Parallel Field of Abell 2744. We utilize extensive simulations to derive the effective selection volume of Lyman-break galaxies at , both in the lensed cluster Field and in the adjacent Parallel Field. Particular care is taken to include position-dependent lensing shear to accurately account for the expected sizes and morphologies of highly magnified sources. We show that both source blending and shear reduce the completeness at a given observed magnitude in the cluster, particularly near the critical curves. These effects have a significant, but largely overlooked, impact on the detectability of high-redshift sources behind clusters, and substantially reduce the expected number of highly magnified sources. The detections and limits from both pointings result in an SFRD which is consistent within the uncertainties with previous estimates at from blank Fields. The combination of these new results with all other estimates is also consistent with a rapidly declining SFRD in the 170 Myr from to as predicted by cosmological simulations and dark-matter halo evolution in ?CDM. Once biases introduced by magnification-dependent completeness are accounted for, the full six cluster and Parallel Frontier Field program will be an extremely powerful new data set to probe the evolution of the galaxy population at before the advent of the James Webb Space Telescope.
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first frontier Field constraints on the cosmic star formation rate density at z 10 the impact of lensing shear on completeness of high redshift galaxy samples
The Astrophysical Journal, 2015Co-Authors: P A Oesch, R J Bouwens, Garth D Illingworth, Marijn Franx, S M Ammons, P G Van Dokkum, Michele Trenti, Ivo LabbeAbstract:We search the complete Hubble Frontier Field data set of Abell 2744 and its Parallel Field for z ∼ 10 sources to further refine the evolution of the cosmic star formation rate density (SFRD) between z ∼ 8 and z ∼ 10. We independently confirm two images of the recently discovered triply imaged z ∼ 9.8 source by Zitrin et al. and set an upper limit for similar z ∼ 10 galaxies with red colors of J - H 1.2 in the Parallel Field of Abell 2744. We utilize extensive simulations to derive the effective selection volume of Lyman-break galaxies at z ∼ 10, both in the lensed cluster Field and in the adjacent Parallel Field. Particular care is taken to include position-dependent lensing shear to accurately account for the expected sizes and morphologies of highly magnified sources. We show that both source blending and shear reduce the completeness at a given observed magnitude in the cluster, particularly near the critical curves. These effects have a significant, but largely overlooked, impact on the detectability of high-redshift sources behind clusters, and substantially reduce the expected number of highly magnified sources. The detections and limits from both pointings result in an SFRD which is consistent within the uncertainties with previous estimates at z ∼ 10 from blank Fields. The combination of these new results with all other estimates is also consistent with a rapidly declining SFRD in the 170 Myr from z ∼ 8 to z ∼ 10 as predicted by cosmological simulations and dark-matter halo evolution in as predicted by cosmological simulations and dark-matter halo evolution in ΛCDM. Once biases introduced by magnification-dependent completeness are accounted for, the full six cluster and Parallel Frontier Field program will be an extremely powerful new data set to probe the evolution of the galaxy population at z > 8 before the advent of the James Webb Space Telescope. 125 160
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first frontier Field constraints on the cosmic star formation rate density at z 10 the impact of lensing shear on completeness of high redshift galaxy samples
arXiv: Astrophysics of Galaxies, 2014Co-Authors: P A Oesch, R J Bouwens, Garth D Illingworth, Marijn Franx, S M Ammons, P G Van Dokkum, Michele Trenti, Ivo LabbeAbstract:We search the complete Hubble Frontier Field dataset of Abell 2744 and its Parallel Field for z~10 sources to further refine the evolution of the cosmic star-formation rate density (SFRD) at z>8. We independently confirm two images of the recently discovered triply-imaged z~9.8 source by Zitrin et al. (2014) and set an upper limit for similar z~10 galaxies with red colors of J_125-H_160>1.2 in the Parallel Field of Abell 2744. We utilize extensive simulations to derive the effective selection volume of Lyman-break galaxies at z~10, both in the lensed cluster Field and in the adjacent Parallel Field. Particular care is taken to include position-dependent lensing shear to accurately account for the expected sizes and morphologies of highly-magnified sources. We show that both source blending and shear reduce the completeness at a given observed magnitude in the cluster, particularly near the critical curves. These effects have a significant, but largely overlooked, impact on the detectability of high-redshift sources behind clusters, and substantially reduce the expected number of highly-magnified sources. The detections and limits from both pointings result in a SFRD which is higher by 0.4+-0.4 dex than previous estimates at z~10 from blank Fields. Nevertheless, the combination of these new results with all other estimates remain consistent with a rapidly declining SFRD in the 170 Myr from z~8 to z~10 as predicted by cosmological simulations and dark-matter halo evolution in LambdaCDM. Once biases introduced by magnification-dependent completeness are accounted for, the full six cluster and Parallel Frontier Field program will be an extremely powerful new dataset to probe the evolution of the galaxy population at z>8 before the advent of the JWST.
