Spitzer Observations of the Prototypical Extremely Red Objects HR 10 and LBDS 53W091: Separating Dusty Starbursts from Old Elliptical Galaxies
Abstract
We present Spitzer Space Telescope observations of the well-studied extremely red objects (EROs) HR 10 and LBDS 53W091 from 3.6 to 160 μm. These galaxies are the prototypes of the two primary classes of EROs: dusty starbursts and old, evolved galaxies, respectively. Both galaxies, as well as LBDS 53W069, another example of an old, quiescent galaxy, are well detected out to 8 μm. However, only the dusty starburst HR 10 is detected in the far-infrared. All three EROs have stellar masses of a few × 10^(11) M_☉. Using evolutionary model fits to their multiband photometry, we predict the infrared colors of similar EROs at 1 < z < 2. We find that blueward of observed 10 μm, the two ERO classes are virtually indistinguishable photometrically. Deep spectroscopy and 24 μm data allow the classes to be separated.
Additional Information
© 2006 American Astronomical Society. Received 2005 December 22; accepted 2006 May 21. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a NASA contract. Support was provided by NASA through an award issued by JPL/Caltech.Attached Files
Published - STEaj06.pdf
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Additional details
- Eprint ID
- 24571
- Resolver ID
- CaltechAUTHORS:20110727-113602556
- NASA/JPL/Caltech
- Created
-
2011-07-27Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)