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Date and Time of the Query: 2019-05-25 T19:34:02 PDT
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For refcode 2008ApJ...677..828S:
Retrieve 32 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2008ApJ...677..828S On the Stellar Populations in Faint Red Galaxies in the Hubble Ultra Deep Field Stutz, Amelia M.; Papovich, Casey; Eisenstein, Daniel J. Abstract. We study the nature of faint red-selected galaxies at z~2-3 using the Hubble Ultra Deep Field (HUDF) and Spitzer Infrared Array Camera (IRAC) photometry. Given the magnitude limit of the HST data, we detect candidate galaxies to H_AB_<26 mag, probing lower luminosity (lower mass) galaxies at these redshifts. We identify 32 galaxies satisfying the (J_110_-H_160_)_AB_>1.0 mag color selection, 16 of which have unblended [3.6 micron] and [4.5 micron] photometry from Spitzer. Using this multiwavelength data set, we derive photometric redshifts, masses, and stellar population parameters for these objects. We find that the selected objects span a diverse range of properties over a large range of redshifts, 1<~z<~3.5. A substantial fraction (11/32) of the (J_110_-H_160_)_AB_>1.0 mag population appear to be lower redshift (z<~2.5), heavily obscured dusty galaxies or edge-on spiral galaxies, while others (12/32) appear to be galaxies at 2<~z<~3.5 whose light at rest-frame optical wavelengths is dominated by evolved stellar populations. We argue that longer wavelength data (>~1 micron, rest frame) are essential for interpreting the properties of the stellar populations in red-selected galaxies at these redshifts. Interestingly, by including Spitzer data, many candidates for galaxies dominated by evolved stellar populations are rejected, and for only a subset of the sample (6/16) do the data favor this interpretation. These objects have a surface density of ~1 arcmin^-2^. We place an upper limit on the space density of candidate massive evolved galaxies with 2.5<z<3.5 and H_AB160_<=26 mag of n=6.6^+2.0^_-3.0_x10^-4^ Mpc^-3^, with a corresponding upper limit on the stellar mass density of {rho}^*^=5.6^+4.4^_-2.8_x10^7^ M_sun_ Mpc^-3^. The z>2.5 objects that are dominated by evolved stellar populations have a space density at most one-third that of z~0 red early-type galaxies. Therefore, at least two-thirds of present-day early-type galaxies assemble or evolve into their current configuration at redshifts below 2.5. We find a dearth of candidates for low-mass (<~2x10^10^ M_sun_) galaxies at 1.5<z<~3 that are dominated by passively evolving stellar populations even though the data should be sensitive to them; thus, at these redshifts, galaxies whose light is dominated by evolved stellar populations are restricted to only those galaxies that have assembled high stellar mass. Key words: Galaxies: High-Redshift
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