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J E Carlstrom - One of the best experts on this subject based on the ideXlab platform.
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the evolution of the intracluster medium Metallicity in sunyaev zel dovich selected galaxy clusters at 0 z 1 5
The Astrophysical Journal, 2016Co-Authors: M Mcdonald, Esra Bulbul, T De Haan, Eric D Miller, B A Benson, L E Bleem, Mark Brodwin, J E CarlstromAbstract:We present the results of an X-ray spectral analysis of 153 galaxy clusters observed with the Chandra, XMM-Newton, and Suzaku space telescopes. These clusters, which span 0 = 0.23 +/- 0.01 Z(circle dot) and a scatter of sigma Z = 0.08 +/- 0.01 Z(circle dot). These results imply that the emission-weighted Metallicity has not changed by more than 40% since z = 1 (at 95% confidence), consistent with the picture of an early (z > 1) enrichment. We find, in agreement with previous works, a significantly higher mean value for the Metallicity in the centers of cool core clusters versus non-cool core clusters. We find weak evidence for evolution in the central Metallicity of cool core clusters (dZ/dz = -0.21 +/- 0.11 Z(circle dot)), which is sufficient to account for this enhanced central Metallicity over the past similar to 10 Gyr. We find no evidence for Metallicity evolution outside of the core (dZ/dz = -0.03 +/- 0.06 Z(circle dot)), and no significant difference in the core-excised Metallicity between cool core and non-cool core clusters. This suggests that strong radio-mode active galactic nucleus feedback does not significantly alter the distribution of metals at r > 0.15R(500). Given the limitations of current-generation X-ray telescopes in constraining the ICM Metallicity at z > 1, significant improvements on this work will likely require next-generation X-ray missions.
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the evolution of the intracluster medium Metallicity in sunyaev zel dovich selected galaxy clusters at 0 z 1 5
arXiv: Cosmology and Nongalactic Astrophysics, 2016Co-Authors: M Mcdonald, Esra Bulbul, T De Haan, Eric D Miller, B A Benson, L E Bleem, Mark Brodwin, J E CarlstromAbstract:We present the results of an X-ray spectral analysis of 153 galaxy clusters observed with the Chandra, XMM-Newton, and Suzaku space telescopes. These clusters, which span 0 = 0.23 +/- 0.01 Zsun and a scatter of 0.08 +/- 0.01 Zsun. These results imply that >60% of the metals in the ICM were already in place at z=1 (at 95% confidence), consistent with the picture of an early (z>1) enrichment. We find, in agreement with previous works, a significantly higher mean value for the Metallicity in the centers of cool core clusters versus non-cool core clusters. We find weak evidence for evolution in the central Metallicity of cool core clusters (dZ/dz = -0.21 +/- 0.11 Zsun), which is sufficient to account for this enhanced central Metallicity over the past ~10 Gyr. We find no evidence for Metallicity evolution outside of the core (dZ/dz = -0.03 +/- 0.06 Zsun), and no significant difference in the core-excised Metallicity between cool core and non-cool core clusters. This suggests that strong radio-mode AGN feedback does not significantly alter the distribution of metals at r>0.15R500. Given the limitations of current-generation X-ray telescopes in constraining the ICM Metallicity at z>1, significant improvements on this work will likely require next-generation X-ray missions.
L E Bleem - One of the best experts on this subject based on the ideXlab platform.
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the evolution of the intracluster medium Metallicity in sunyaev zel dovich selected galaxy clusters at 0 z 1 5
The Astrophysical Journal, 2016Co-Authors: M Mcdonald, Esra Bulbul, T De Haan, Eric D Miller, B A Benson, L E Bleem, Mark Brodwin, J E CarlstromAbstract:We present the results of an X-ray spectral analysis of 153 galaxy clusters observed with the Chandra, XMM-Newton, and Suzaku space telescopes. These clusters, which span 0 = 0.23 +/- 0.01 Z(circle dot) and a scatter of sigma Z = 0.08 +/- 0.01 Z(circle dot). These results imply that the emission-weighted Metallicity has not changed by more than 40% since z = 1 (at 95% confidence), consistent with the picture of an early (z > 1) enrichment. We find, in agreement with previous works, a significantly higher mean value for the Metallicity in the centers of cool core clusters versus non-cool core clusters. We find weak evidence for evolution in the central Metallicity of cool core clusters (dZ/dz = -0.21 +/- 0.11 Z(circle dot)), which is sufficient to account for this enhanced central Metallicity over the past similar to 10 Gyr. We find no evidence for Metallicity evolution outside of the core (dZ/dz = -0.03 +/- 0.06 Z(circle dot)), and no significant difference in the core-excised Metallicity between cool core and non-cool core clusters. This suggests that strong radio-mode active galactic nucleus feedback does not significantly alter the distribution of metals at r > 0.15R(500). Given the limitations of current-generation X-ray telescopes in constraining the ICM Metallicity at z > 1, significant improvements on this work will likely require next-generation X-ray missions.
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the evolution of the intracluster medium Metallicity in sunyaev zel dovich selected galaxy clusters at 0 z 1 5
arXiv: Cosmology and Nongalactic Astrophysics, 2016Co-Authors: M Mcdonald, Esra Bulbul, T De Haan, Eric D Miller, B A Benson, L E Bleem, Mark Brodwin, J E CarlstromAbstract:We present the results of an X-ray spectral analysis of 153 galaxy clusters observed with the Chandra, XMM-Newton, and Suzaku space telescopes. These clusters, which span 0 = 0.23 +/- 0.01 Zsun and a scatter of 0.08 +/- 0.01 Zsun. These results imply that >60% of the metals in the ICM were already in place at z=1 (at 95% confidence), consistent with the picture of an early (z>1) enrichment. We find, in agreement with previous works, a significantly higher mean value for the Metallicity in the centers of cool core clusters versus non-cool core clusters. We find weak evidence for evolution in the central Metallicity of cool core clusters (dZ/dz = -0.21 +/- 0.11 Zsun), which is sufficient to account for this enhanced central Metallicity over the past ~10 Gyr. We find no evidence for Metallicity evolution outside of the core (dZ/dz = -0.03 +/- 0.06 Zsun), and no significant difference in the core-excised Metallicity between cool core and non-cool core clusters. This suggests that strong radio-mode AGN feedback does not significantly alter the distribution of metals at r>0.15R500. Given the limitations of current-generation X-ray telescopes in constraining the ICM Metallicity at z>1, significant improvements on this work will likely require next-generation X-ray missions.
B A Benson - One of the best experts on this subject based on the ideXlab platform.
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the evolution of the intracluster medium Metallicity in sunyaev zel dovich selected galaxy clusters at 0 z 1 5
The Astrophysical Journal, 2016Co-Authors: M Mcdonald, Esra Bulbul, T De Haan, Eric D Miller, B A Benson, L E Bleem, Mark Brodwin, J E CarlstromAbstract:We present the results of an X-ray spectral analysis of 153 galaxy clusters observed with the Chandra, XMM-Newton, and Suzaku space telescopes. These clusters, which span 0 = 0.23 +/- 0.01 Z(circle dot) and a scatter of sigma Z = 0.08 +/- 0.01 Z(circle dot). These results imply that the emission-weighted Metallicity has not changed by more than 40% since z = 1 (at 95% confidence), consistent with the picture of an early (z > 1) enrichment. We find, in agreement with previous works, a significantly higher mean value for the Metallicity in the centers of cool core clusters versus non-cool core clusters. We find weak evidence for evolution in the central Metallicity of cool core clusters (dZ/dz = -0.21 +/- 0.11 Z(circle dot)), which is sufficient to account for this enhanced central Metallicity over the past similar to 10 Gyr. We find no evidence for Metallicity evolution outside of the core (dZ/dz = -0.03 +/- 0.06 Z(circle dot)), and no significant difference in the core-excised Metallicity between cool core and non-cool core clusters. This suggests that strong radio-mode active galactic nucleus feedback does not significantly alter the distribution of metals at r > 0.15R(500). Given the limitations of current-generation X-ray telescopes in constraining the ICM Metallicity at z > 1, significant improvements on this work will likely require next-generation X-ray missions.
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the evolution of the intracluster medium Metallicity in sunyaev zel dovich selected galaxy clusters at 0 z 1 5
arXiv: Cosmology and Nongalactic Astrophysics, 2016Co-Authors: M Mcdonald, Esra Bulbul, T De Haan, Eric D Miller, B A Benson, L E Bleem, Mark Brodwin, J E CarlstromAbstract:We present the results of an X-ray spectral analysis of 153 galaxy clusters observed with the Chandra, XMM-Newton, and Suzaku space telescopes. These clusters, which span 0 = 0.23 +/- 0.01 Zsun and a scatter of 0.08 +/- 0.01 Zsun. These results imply that >60% of the metals in the ICM were already in place at z=1 (at 95% confidence), consistent with the picture of an early (z>1) enrichment. We find, in agreement with previous works, a significantly higher mean value for the Metallicity in the centers of cool core clusters versus non-cool core clusters. We find weak evidence for evolution in the central Metallicity of cool core clusters (dZ/dz = -0.21 +/- 0.11 Zsun), which is sufficient to account for this enhanced central Metallicity over the past ~10 Gyr. We find no evidence for Metallicity evolution outside of the core (dZ/dz = -0.03 +/- 0.06 Zsun), and no significant difference in the core-excised Metallicity between cool core and non-cool core clusters. This suggests that strong radio-mode AGN feedback does not significantly alter the distribution of metals at r>0.15R500. Given the limitations of current-generation X-ray telescopes in constraining the ICM Metallicity at z>1, significant improvements on this work will likely require next-generation X-ray missions.
Lisa J. Kewley - One of the best experts on this subject based on the ideXlab platform.
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High Metallicity LGRB Hosts
arXiv: High Energy Astrophysical Phenomena, 2015Co-Authors: J. F. Graham, Lisa J. Kewley, A. S. Fruchter, Emily M. Levesque, Nial R. Tanvir, Andrew J. Levan, Sandeep K. Patel, Kuntal Misra, K. H. Huang, Daniel E. ReichartAbstract:We present our imaging and spectroscopic observations of the host galaxies of two dark long bursts with anomalously high metallicities, LGRB 051022 and LGRB 020819B, which in conjunction with another LGRB event with an optical afterglow comprise the three LGRBs with high Metallicity host galaxies in the Graham & Fruchter (2013) sample. In Graham & Fruchter (2013), we showed that LGRBs exhibit a strong and apparently intrinsic preference for low Metallicity environments (12+log(O/H) < 8.4 in the KK04 scale) in spite of these three cases with abundances of about solar and above. These exceptions however are consistent with the general star-forming galaxy population of comparable brightness & redshift. This is surprising: even among a preselected sample of high Metallicity LGRBs, were the metal aversion to remain in effect for these objects, we would expect their Metallicity to still be lower than the typical Metallicity for the galaxies at that luminosity and redshift. Therefore we deduce that it is possible to form an LGRB in a high Metallicity environment although with greater rarity. From this we conclude that there are three possible explanations for the presence of the LGRBs observed in high Metallicity hosts as seen to date: (1) LGRBs do not occur in high Metallicity environments and those seen in high Metallicity hosts are in fact occurring in low Metallicity environments that have become associated with otherwise high Metallicity hosts but remain unenriched. (2) The LGRB formation mechanism while preferring low Metallicity environments does not strictly require it resulting in a gradual decline in burst formation with increasing Metallicity. (3) The typical low Metallicity LGRBs and the few high Metallicity cases are the result of physically different burst formation pathways with only the former affected by the Metallicity and the later occurring much more infrequently.
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The Metallicity Evolution of Interacting Galaxies
The Astrophysical Journal, 2012Co-Authors: Paul Torrey, Lisa J. Kewley, Thomas J. Cox, Lars HernquistAbstract:Nuclear inflows of metal-poor interstellar gas triggered by galaxy interactions can account for the systematically lower central oxygen abundances observed in local interacting galaxies. Here, we investigate the Metallicity evolution of a large set of simulations of colliding galaxies. Our models include cooling, star formation, feedback, and a new stochastic method for tracking the mass recycled back to the interstellar medium from stellar winds and supernovae. We study the influence of merger-induced inflows, enrichment, gas consumption, and galactic winds in determining the nuclear Metallicity. The central Metallicity is primarily a competition between the inflow of low-Metallicity gas and enrichment from star formation. An average depression in the nuclear Metallicity of ~0.07 is found for gas-poor disk-disk interactions. Gas-rich disk-disk interactions, on the other hand, typically have an enhancement in the central Metallicity that is positively correlated with the gas content. The simulations fare reasonably well when compared to the observed mass-Metallicity and separation-Metallicity relationships, but further study is warranted.
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galaxy mergers and the mass Metallicity relation evidence for nuclear metal dilution and flattened gradients from numerical simulations
The Astrophysical Journal, 2010Co-Authors: David S N Rupke, Lisa J. Kewley, Joshua E BarnesAbstract:Recent results comparing interacting galaxies to the mass-Metallicity relation show that their nuclear oxygen abundances are unexpectedly low. We present analysis of N-body/smoothed-particle hydrodynamics numerical simulations of equal-mass mergers that confirm the hypothesis that these underabundances are accounted for by radial inflow of low-Metallicity gas from the outskirts of the two merging galaxies. The underabundances arise between first and second pericenters, and the simulated abundance dilution is in good agreement with observations. The simulations further predict that the radial Metallicity gradients of the disk galaxies flatten shortly after first passage, due to radial mixing of gas. These predictions will be tested by future observations of the radial Metallicity distributions in interacting galaxies.
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Metallicity calibrations and the mass Metallicity relation for star forming galaxies
The Astrophysical Journal, 2008Co-Authors: Lisa J. Kewley, Sara L. EllisonAbstract:We investigate the effect of Metallicity calibrations, AGN classification, and aperture covering fraction on the local mass-Metallicity relation using 27,730 star-forming galaxies from the Sloan Digital Sky Survey (SDSS) Data Release 4. We analyse the SDSS mass-Metallicity relation with 10 Metallicity calibrations, including theoretical and empirical methods. We show that the choice of Metallicity calibration has a significant effect on the shape and y-intercept(12+log(O/H)) of the mass-Metallicity relation. The absolute Metallicity scale (y-intercept) varies up to �[log(O/H)] = 0.7 dex, depending on the calibration used, and the change in shape is substantial. These results indicate that it is critical to use the same Metallicity calibration when comparing different luminosity-Metallicity or mass-Metallicity relations. We present new Metallicity conversions that allow metallicities that have been derived using different strong-line calibrations to be converted to the same base calibration. These conversions facilitate comparisons between different samples, particularly comparisons between galaxies at different redshifts for which different suites of emission-lines are available. Our new conversions successfully remove the large 0.7 dex discrepancies between the Metallicity calibrations, and we reach agreement in the mass-Metallicity relation to within 0.03 dex on average. We investigate the effect of AGN classification and aperture covering fraction on the mass-Metallicity relation. We find that different AGN classification methods have negligible effect on the SDSS MZ-relation. We compare the SDSS mass-Metallicity relation with nuclear and global relations from the Nearby Field Galaxy Survey (NFGS). The turn over of the mass-Metallicity relation at M∗ ∼ 10 10 M⊙ depends on aperture covering fraction. We find that a lower redshift limit of z 10 10 M⊙) galaxies. Subject headings: galaxies: starburst—galaxies: abundances—galaxies: fundamental parameters— galaxies: spiral—techniques: spectroscopic
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Metallicity Calibrations and the Mass-Metallicity Relation for Star-Forming Galaxies
The Astrophysical Journal, 2008Co-Authors: Lisa J. Kewley, Sara L. EllisonAbstract:(Abridged) We investigate the effect of Metallicity calibrations, AGN classification, and aperture covering fraction on the local mass-Metallicity (MZ) relation using 27,730 star-forming galaxies from the Sloan Digital Sky Survey (SDSS) Data Release 4. We analyse the SDSS MZ relation with 10 Metallicity calibrations, including theoretical and empirical methods. We show that the choice of Metallicity calibration has a significant effect on the shape and y-intercept(12+log(O/H)) of the MZ relation. The absolute Metallicity scale (y-int) varies up to 0.7 dex, depending on the calibration used, and the change in shape is substantial. These results indicate that it is critical to use the same Metallicity calibration when comparing different luminosity-Metallicity or mass-Metallicity relations. We present new Metallicity conversions that allow metallicities that have been derived using different strong-line calibrations to be converted to the same base calibration. These conversions facilitate comparisons between different samples, particularly comparisons between galaxies at different redshifts for which different suites of emission-lines are available.Our new conversions successfully remove the large 0.7 dex discrepancies between the Metallicity calibrations, and we reach agreement in the MZ relation to within 0.03 dex on average. We find that different AGN classification methods have negligible effect on the SDSS MZ relation. We compare the SDSS MZ relation with nuclear and global relations from the Nearby Field Galaxy Survey (NFGS). The turn over of the MZ relation depends on aperture covering fraction. We find that a lower redshift limit of z
M Mcdonald - One of the best experts on this subject based on the ideXlab platform.
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the evolution of the intracluster medium Metallicity in sunyaev zel dovich selected galaxy clusters at 0 z 1 5
The Astrophysical Journal, 2016Co-Authors: M Mcdonald, Esra Bulbul, T De Haan, Eric D Miller, B A Benson, L E Bleem, Mark Brodwin, J E CarlstromAbstract:We present the results of an X-ray spectral analysis of 153 galaxy clusters observed with the Chandra, XMM-Newton, and Suzaku space telescopes. These clusters, which span 0 = 0.23 +/- 0.01 Z(circle dot) and a scatter of sigma Z = 0.08 +/- 0.01 Z(circle dot). These results imply that the emission-weighted Metallicity has not changed by more than 40% since z = 1 (at 95% confidence), consistent with the picture of an early (z > 1) enrichment. We find, in agreement with previous works, a significantly higher mean value for the Metallicity in the centers of cool core clusters versus non-cool core clusters. We find weak evidence for evolution in the central Metallicity of cool core clusters (dZ/dz = -0.21 +/- 0.11 Z(circle dot)), which is sufficient to account for this enhanced central Metallicity over the past similar to 10 Gyr. We find no evidence for Metallicity evolution outside of the core (dZ/dz = -0.03 +/- 0.06 Z(circle dot)), and no significant difference in the core-excised Metallicity between cool core and non-cool core clusters. This suggests that strong radio-mode active galactic nucleus feedback does not significantly alter the distribution of metals at r > 0.15R(500). Given the limitations of current-generation X-ray telescopes in constraining the ICM Metallicity at z > 1, significant improvements on this work will likely require next-generation X-ray missions.
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the evolution of the intracluster medium Metallicity in sunyaev zel dovich selected galaxy clusters at 0 z 1 5
arXiv: Cosmology and Nongalactic Astrophysics, 2016Co-Authors: M Mcdonald, Esra Bulbul, T De Haan, Eric D Miller, B A Benson, L E Bleem, Mark Brodwin, J E CarlstromAbstract:We present the results of an X-ray spectral analysis of 153 galaxy clusters observed with the Chandra, XMM-Newton, and Suzaku space telescopes. These clusters, which span 0 = 0.23 +/- 0.01 Zsun and a scatter of 0.08 +/- 0.01 Zsun. These results imply that >60% of the metals in the ICM were already in place at z=1 (at 95% confidence), consistent with the picture of an early (z>1) enrichment. We find, in agreement with previous works, a significantly higher mean value for the Metallicity in the centers of cool core clusters versus non-cool core clusters. We find weak evidence for evolution in the central Metallicity of cool core clusters (dZ/dz = -0.21 +/- 0.11 Zsun), which is sufficient to account for this enhanced central Metallicity over the past ~10 Gyr. We find no evidence for Metallicity evolution outside of the core (dZ/dz = -0.03 +/- 0.06 Zsun), and no significant difference in the core-excised Metallicity between cool core and non-cool core clusters. This suggests that strong radio-mode AGN feedback does not significantly alter the distribution of metals at r>0.15R500. Given the limitations of current-generation X-ray telescopes in constraining the ICM Metallicity at z>1, significant improvements on this work will likely require next-generation X-ray missions.
