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Full-Text Articles in Physics
Recovering Stellar Population Parameters Via Two Full-Spectrum Fitting Algorithms In The Absence Of Model Uncertainties, Junqiang Ge, Renbin Yan, Michele Cappellari, Shude Mao, Hongyu Li, Youjun Lu
Recovering Stellar Population Parameters Via Two Full-Spectrum Fitting Algorithms In The Absence Of Model Uncertainties, Junqiang Ge, Renbin Yan, Michele Cappellari, Shude Mao, Hongyu Li, Youjun Lu
Physics and Astronomy Faculty Publications
Using mock spectra based on Vazdekis/MILES library fitted within the wavelength region 3600–7350 Å, we analyse the bias and scatter on the resulting physical parameters induced by the choice of fitting algorithms and observational uncertainties, but avoid effects of those model uncertainties. We consider two full-spectrum fitting codes: PPXF and STARLIGHT, in fitting for stellar population age, metallicity, mass-to-light ratio, and dust extinction. With PPXF, we find that both the bias μ in the population parameters and the scatter σ in the recovered logarithmic values follows the expected trend μ ∝ σ ∝ 1/(S/N). The bias increases for younger ages …
Sdss-Iv Manga: The Spatially Resolved Stellar Initial Mass Function In ~400 Early-Type Galaxies, Taniya Parikh, Daniel Thomas, Claudia Maraston, Kyle B. Westfall, Daniel Goddard, Jianhui Lian, Sofia Meneses-Goytia, Amy Jones, Sam Vaughan, Brett H. Andrews, Matthew Bershady, Dmitry Bizyaev, Jonathan Brinkmann, Joel R. Brownstein, Kevin Bundy, Niv Drory, Eric Emsellem, David R. Law, Jeffrey A. Newman, Alexandre Roman-Lopes, David Wake, Renbin Yan, Zheng Zheng
Sdss-Iv Manga: The Spatially Resolved Stellar Initial Mass Function In ~400 Early-Type Galaxies, Taniya Parikh, Daniel Thomas, Claudia Maraston, Kyle B. Westfall, Daniel Goddard, Jianhui Lian, Sofia Meneses-Goytia, Amy Jones, Sam Vaughan, Brett H. Andrews, Matthew Bershady, Dmitry Bizyaev, Jonathan Brinkmann, Joel R. Brownstein, Kevin Bundy, Niv Drory, Eric Emsellem, David R. Law, Jeffrey A. Newman, Alexandre Roman-Lopes, David Wake, Renbin Yan, Zheng Zheng
Physics and Astronomy Faculty Publications
Mapping Nearby Galaxies at Apache Point Observatory provides the opportunity to make precise spatially resolved measurements of the IMF slope in galaxies owing to its unique combination of spatial resolution, wavelength coverage, and sample size. We derive radial gradients in age, element abundances, and IMF slope analysing optical and near-infrared absorption features from stacked spectra out to the half-light radius of 366 early-type galaxies with masses 9.9–10.8 log M/M⊙. We find flat gradients in age and [α/Fe] ratio, as well as negative gradients in metallicity, consistent with the literature. We further derive significant negative gradients …
Sdss Iv Manga – Ssfr Profiles And The Slow Quenching Of Discs In Green Valley Galaxies, Francesco Belfiore, Roberto Maiolino, Kevin Bundy, Karen Masters, Matthew Bershady, Grecco A. Oyarzún, Lihwai Lin, Mariana Cano-Diaz, David Wake, Ashley Spindler, Daniel Thomas, Joel R. Brownstein, Niv Drory, Renbin Yan
Sdss Iv Manga – Ssfr Profiles And The Slow Quenching Of Discs In Green Valley Galaxies, Francesco Belfiore, Roberto Maiolino, Kevin Bundy, Karen Masters, Matthew Bershady, Grecco A. Oyarzún, Lihwai Lin, Mariana Cano-Diaz, David Wake, Ashley Spindler, Daniel Thomas, Joel R. Brownstein, Niv Drory, Renbin Yan
Physics and Astronomy Faculty Publications
We study radial profiles in H α equivalent width and specific star formation rate (sSFR) derived from spatially resolved SDSS-IV MaNGA spectroscopy to gain insight on the physical mechanisms that suppress star formation and determine a galaxy’s location in the SFR-M⋆ diagram. Even within the star-forming ‘main sequence’, the measured sSFR decreases with stellar mass, in both an integrated and spatially resolved sense. Flat sSFR radial profiles are observed for log(M⋆/M⊙) < 10.5, while star-forming galaxies of higher mass show a significant decrease in sSFR in the central regions, a likely consequence of both larger bulges and an inside-out growth history. Our primary focus is the green valley, constituted by galaxies lying below the star formation main sequence, but not fully passive. In the green valley we find sSFR profiles that are suppressed with respect to star-forming galaxies of the same mass at all galactocentric distances out to 2 effective radii. The responsible quenching mechanism therefore appears to affect the entire galaxy, not simply an …
Sdss-Iv Manga: Stellar Angular Momentum Of About 2300 Galaxies: Unveiling The Bimodality Of Massive Galaxy Properties, Mark T. Graham, Michele Cappellari, Hongyu Li, Shude Mao, Matthew A. Bershady, Dmitry Bizyaev, Jonathan Brinkmann, Joel R. Brownstein, Kevin Bundy, Niv Drory, David R. Law, Kaike Pan, Daniel Thomas, David A. Wake, Anne-Marie Weijmans, Kyle Westfall, Renbin Yan
Sdss-Iv Manga: Stellar Angular Momentum Of About 2300 Galaxies: Unveiling The Bimodality Of Massive Galaxy Properties, Mark T. Graham, Michele Cappellari, Hongyu Li, Shude Mao, Matthew A. Bershady, Dmitry Bizyaev, Jonathan Brinkmann, Joel R. Brownstein, Kevin Bundy, Niv Drory, David R. Law, Kaike Pan, Daniel Thomas, David A. Wake, Anne-Marie Weijmans, Kyle Westfall, Renbin Yan
Physics and Astronomy Faculty Publications
We measure λRe, a proxy for galaxy specific stellar angular momentum within one effective radius, and the ellipticity, ϵ, for about 2300 galaxies of all morphological types observed with integral field spectroscopy as part of the Mapping Nearby Galaxies at Apache Point Observatory survey, the largest such sample to date. We use the (λRe, ϵ) diagram to separate early-type galaxies into fast and slow rotators. We also visually classify each galaxy according to its optical morphology and two-dimensional stellar velocity field. Comparing these classifications to quantitative λRe measurements reveals tight …
The [Cii] 158ΜM Line Emission In High-Redshift Galaxies, Guilaine Lagache, Morgane Cousin, Marios Chatzikos
The [Cii] 158ΜM Line Emission In High-Redshift Galaxies, Guilaine Lagache, Morgane Cousin, Marios Chatzikos
Physics and Astronomy Faculty Publications
Gas is a crucial component of galaxies, providing the fuel to form stars, and it is impossible to understand the evolution of galaxies without knowing their gas properties. The [CII] fine structure transition at 158 μm is the dominant cooling line of cool interstellar gas, and is the brightest of emission lines from star forming galaxies from FIR through metre wavelengths, almost unaffected by attenuation. With the advent of ALMA and NOEMA, capable of detecting [CII]-line emission in high-redshift galaxies, there has been a growing interest in using the [CII] line as a probe of the physical conditions of …