Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stellar mass estimates in early-type galaxies from lensing+dynamical and
  photometric measurements   In this paper we compare two different diagnostics for estimating stellar
masses in early-type galaxies and we establish their level of reliability. In
particular, we consider the well-studied sample of 15 field elliptical galaxies
selected from the Sloan Lens ACS (SLACS) Survey (z = 0.06-0.33). We examine
here the correlation between the stellar mass values, enclosed inside the
Einstein radius of each lens, based on analyses of lensing and stellar dynamics
combined and based on multiwavelength photometry spectral template fitting. The
lensing+dynamics stellar mass is obtained from the published SLACS Survey
results, assuming a two-component density distribution model and a prior from
the fundamental plane on the mass-to-light ratio for the lens galaxies. The
photometric stellar mass is measured by fitting the observed spectral energy
distribution of the galaxies (from the SDSS multi-band photometry over 354-913
nm) with composite stellar population templates, under the assumption that
light traces stellar mass. The two methods are completely independent. They
rely on several different assumptions, and so, in principle, both can have
significant biases. Based on our sample of massive galaxies, we find
consistency between the lensing+dynamics and the photometric mass estimates. We
obtain a Pearson linear correlation coefficient of 0.94 and a median value of
the ratio between the former and the latter mass measurements of 1.1+/-0.1.
This suggests that both methods can separately yield reliable stellar masses of
early-type galaxies, and confirms that photometric mass estimates are accurate,
as long as optical/near-IR rest frame photometry is available.

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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph