The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
P M Garnavich - One of the best experts on this subject based on the ideXlab platform.
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improved constraints on type ia supernova host galaxy properties using multi wavelength Photometry and their correlations with supernova properties
The Astrophysical Journal, 2011Co-Authors: R R Gupta, C B Dandrea, M Sako, Charlie Conroy, Mathew Smith, Bruce A Bassett, J Frieman, P M GarnavichAbstract:We improve estimates of the stellar mass and mass-weighted average age of Type Ia supernova (SN Ia) host galaxies by combining UV and near-IR Photometry with optical Photometry in our analysis. Using 206 SNe Ia drawn from the full three-year Sloan Digital Sky Survey (SDSS-II) Supernova Survey (median redshift of z 0.2) and multi-wavelength host-galaxy Photometry from SDSS, the Galaxy Evolution Explorer, and the United Kingdom Infrared Telescope Infrared Deep Sky Survey, we present evidence of a correlation (1.9? confidence level) between the residuals of SNe Ia about the best-fit Hubble relation and the mass-weighted average age of their host galaxies. The trend is such that older galaxies host SNe Ia that are brighter than average after standard light-curve corrections are made. We also confirm, at the 3.0? level, the trend seen by previous studies that more massive galaxies often host brighter SNe Ia after light-curve correction.
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improved constraints on type ia supernova host galaxy properties using multi wavelength Photometry and their correlations with supernova properties
arXiv: Cosmology and Nongalactic Astrophysics, 2011Co-Authors: R R Gupta, C B Dandrea, M Sako, Charlie Conroy, Mathew Smith, Bruce A Bassett, J Frieman, P M GarnavichAbstract:We improve estimates of stellar mass and mass-weighted average age of Type Ia supernova (SN Ia) host galaxies by combining UV and near-IR Photometry with optical Photometry in our analysis. Using 206 SNe Ia drawn from the full three-year SDSS-II Supernova Survey (median redshift of z {\approx} 0.2) and multi-wavelength host-galaxy Photometry from SDSS, GALEX, and UKIDSS, we present evidence of a correlation (1.9{\sigma} confidence level) between the residuals of SNe Ia about the best-fit Hubble relation and the mass-weighted average age of their host galaxies. The trend is such that older galaxies host SNe Ia that are brighter than average after standard light-curve corrections are made. We also confirm, at the 3.0{\sigma} level, the trend seen by previous studies that more massive galaxies often host brighter SNe Ia after light-curve correction.
J Frieman - One of the best experts on this subject based on the ideXlab platform.
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improved constraints on type ia supernova host galaxy properties using multi wavelength Photometry and their correlations with supernova properties
The Astrophysical Journal, 2011Co-Authors: R R Gupta, C B Dandrea, M Sako, Charlie Conroy, Mathew Smith, Bruce A Bassett, J Frieman, P M GarnavichAbstract:We improve estimates of the stellar mass and mass-weighted average age of Type Ia supernova (SN Ia) host galaxies by combining UV and near-IR Photometry with optical Photometry in our analysis. Using 206 SNe Ia drawn from the full three-year Sloan Digital Sky Survey (SDSS-II) Supernova Survey (median redshift of z 0.2) and multi-wavelength host-galaxy Photometry from SDSS, the Galaxy Evolution Explorer, and the United Kingdom Infrared Telescope Infrared Deep Sky Survey, we present evidence of a correlation (1.9? confidence level) between the residuals of SNe Ia about the best-fit Hubble relation and the mass-weighted average age of their host galaxies. The trend is such that older galaxies host SNe Ia that are brighter than average after standard light-curve corrections are made. We also confirm, at the 3.0? level, the trend seen by previous studies that more massive galaxies often host brighter SNe Ia after light-curve correction.
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improved constraints on type ia supernova host galaxy properties using multi wavelength Photometry and their correlations with supernova properties
arXiv: Cosmology and Nongalactic Astrophysics, 2011Co-Authors: R R Gupta, C B Dandrea, M Sako, Charlie Conroy, Mathew Smith, Bruce A Bassett, J Frieman, P M GarnavichAbstract:We improve estimates of stellar mass and mass-weighted average age of Type Ia supernova (SN Ia) host galaxies by combining UV and near-IR Photometry with optical Photometry in our analysis. Using 206 SNe Ia drawn from the full three-year SDSS-II Supernova Survey (median redshift of z {\approx} 0.2) and multi-wavelength host-galaxy Photometry from SDSS, GALEX, and UKIDSS, we present evidence of a correlation (1.9{\sigma} confidence level) between the residuals of SNe Ia about the best-fit Hubble relation and the mass-weighted average age of their host galaxies. The trend is such that older galaxies host SNe Ia that are brighter than average after standard light-curve corrections are made. We also confirm, at the 3.0{\sigma} level, the trend seen by previous studies that more massive galaxies often host brighter SNe Ia after light-curve correction.
Bruce A Bassett - One of the best experts on this subject based on the ideXlab platform.
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improved constraints on type ia supernova host galaxy properties using multi wavelength Photometry and their correlations with supernova properties
The Astrophysical Journal, 2011Co-Authors: R R Gupta, C B Dandrea, M Sako, Charlie Conroy, Mathew Smith, Bruce A Bassett, J Frieman, P M GarnavichAbstract:We improve estimates of the stellar mass and mass-weighted average age of Type Ia supernova (SN Ia) host galaxies by combining UV and near-IR Photometry with optical Photometry in our analysis. Using 206 SNe Ia drawn from the full three-year Sloan Digital Sky Survey (SDSS-II) Supernova Survey (median redshift of z 0.2) and multi-wavelength host-galaxy Photometry from SDSS, the Galaxy Evolution Explorer, and the United Kingdom Infrared Telescope Infrared Deep Sky Survey, we present evidence of a correlation (1.9? confidence level) between the residuals of SNe Ia about the best-fit Hubble relation and the mass-weighted average age of their host galaxies. The trend is such that older galaxies host SNe Ia that are brighter than average after standard light-curve corrections are made. We also confirm, at the 3.0? level, the trend seen by previous studies that more massive galaxies often host brighter SNe Ia after light-curve correction.
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improved constraints on type ia supernova host galaxy properties using multi wavelength Photometry and their correlations with supernova properties
arXiv: Cosmology and Nongalactic Astrophysics, 2011Co-Authors: R R Gupta, C B Dandrea, M Sako, Charlie Conroy, Mathew Smith, Bruce A Bassett, J Frieman, P M GarnavichAbstract:We improve estimates of stellar mass and mass-weighted average age of Type Ia supernova (SN Ia) host galaxies by combining UV and near-IR Photometry with optical Photometry in our analysis. Using 206 SNe Ia drawn from the full three-year SDSS-II Supernova Survey (median redshift of z {\approx} 0.2) and multi-wavelength host-galaxy Photometry from SDSS, GALEX, and UKIDSS, we present evidence of a correlation (1.9{\sigma} confidence level) between the residuals of SNe Ia about the best-fit Hubble relation and the mass-weighted average age of their host galaxies. The trend is such that older galaxies host SNe Ia that are brighter than average after standard light-curve corrections are made. We also confirm, at the 3.0{\sigma} level, the trend seen by previous studies that more massive galaxies often host brighter SNe Ia after light-curve correction.
Elizabeth J Barton - One of the best experts on this subject based on the ideXlab platform.
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cfa3 185 type ia supernova light curves from the cfa
The Astrophysical Journal, 2009Co-Authors: Malcolm Hicken, Peter Challis, Saurabh W Jha, Robert P Kirshner, Thomas Matheson, Maryam Modjaz, Armin Rest, Michael W Woodvasey, G A Bakos, Elizabeth J BartonAbstract:We present multiband Photometry of 185 type-Ia supernovae (SNe Ia), with over 11,500 observations. These were acquired between 2001 and 2008 at the F. L. Whipple Observatory of the Harvard-Smithsonian Center for Astrophysics (CfA). This sample contains the largest number of homogeneously observed and reduced nearby SNe Ia (z 0.08) published to date. It more than doubles the nearby sample, bringing SN Ia cosmology to the point where systematic uncertainties dominate. Our natural system Photometry has a precision of 0.02 mag in BVRIr'i' and 0.04 mag in U for points brighter than 17.5 mag. We also estimate a systematic uncertainty of 0.03 mag in our SN Ia standard system BVRIr'i' Photometry and 0.07 mag for U. Comparisons of our standard system Photometry with published SN Ia light curves and comparison stars, where available for the same SN, reveal agreement at the level of a few hundredths mag in most cases. We find that 1991bg-like SNe Ia are sufficiently distinct from other SNe Ia in their color and light-curve-shape/luminosity relation that they should be treated separately in light-curve/distance fitter training samples. The CfA3 sample will contribute to the development of better light-curve/distance fitters, particularly in the few dozen cases where near-infrared Photometry has been obtained and, together, can help disentangle host-galaxy reddening from intrinsic supernova color, reducing the systematic uncertainty in SN Ia distances due to dust.
H Sana - One of the best experts on this subject based on the ideXlab platform.
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the vlt flames tarantula survey xvi the optical and nir extinction laws in 30 doradus and the photometric determination of the effective temperatures of ob stars
Astronomy and Astrophysics, 2014Co-Authors: Maiz J Apellaniz, C J Evans, R H Barba, G Grafener, J M Bestenlehner, P A Crowther, M Garcia, A Herrero, H SanaAbstract:Context. The commonly used extinction laws of Cardelli et al. (1989, ApJ, 345, 245) have limitations that, among other issues, hamper the determination of the effective temperatures of O and early B stars from optical and near-infrared (NIR) Photometry. Aims. We aim to develop a new family of extinction laws for 30 Doradus, check their general applicability within that region and elsewhere, and apply them to test the feasibility of using optical and NIR Photometry to determine the effective temperature of OB stars. Methods. We use spectroscopy and NIR Photometry from the VLT-FLAMES Tarantula Survey and optical Photometry from HST/WFC3 of 30 Doradus and we analyze them with the software code CHORIZOS using different assumptions, such as the family of extinction laws. Results. We derive a new family of optical and NIR extinction laws for 30 Doradus and confirm its applicability to extinguished Galactic O-type systems. We conclude that by using the new extinction laws it is possible to measure the effective temperatures of OB stars with moderate uncertainties and only a small bias, at least up to E(4405 − 5495) ∼ 1. 5m ag.
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the vlt flames tarantula survey xvi the optical nir extinction laws in 30 doradus and the photometric determination of the effective temperatures of ob stars
arXiv: Astrophysics of Galaxies, 2014Co-Authors: Maiz J Apellaniz, C J Evans, R H Barba, G Grafener, J M Bestenlehner, P A Crowther, M Garcia, A Herrero, H Sana, S SimondiazAbstract:Context: The commonly used extinction laws of Cardelli et al. (1989) have limitations that, among other issues, hamper the determination of the effective temperatures of O and early B stars from optical+NIR Photometry. Aims: We aim to develop a new family of extinction laws for 30 Doradus, check their general applicability within that region and elsewhere, and apply them to test the feasibility of using optical+NIR Photometry to determine the effective temperature of OB stars. Methods: We use spectroscopy and NIR Photometry from the VLT-FLAMES Tarantula Survey and optical Photometry from HST/WFC3 of 30 Doradus and we analyze them with the software code CHORIZOS using different assumptions such as the family of extinction laws. Results: We derive a new family of optical+NIR extinction laws for 30 Doradus and confirm its applicability to extinguished Galactic O-type systems. We conclude that by using the new extinction laws it is possible to measure the effective temperatures of OB stars with moderate uncertainties and only a small bias, at least up to E(4405-5495) ~ 1.5 mag.
