Spitzer Observations of the Prototypical Extremely Red Objects HR 10 and LBDS 53W091: Separating Dusty Starbursts from Old Elliptical Galaxies (original) (raw)
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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×1011 Msolar. 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.
Publication:
The Astronomical Journal
Pub Date:
September 2006
DOI:
10.48550/arXiv.astro-ph/0607507
arXiv:
Bibcode:
Keywords:
- Galaxies: Evolution;
- galaxies: individual (HR 10);
- galaxies: individual (LBDS 53W069);
- galaxies: individual (LBDS 53W091);
- Infrared: Galaxies;
- Astrophysics
E-Print:
23 pages, 4 figures