Spitzer Observations of the Prototypical Extremely Red Objects HR 10 and LBDS 53W091: Separating Dusty Starbursts from Old Elliptical Galaxies

September 2006 • 2006AJ....132.1405S

Authors • Stern, Daniel • Chary, Ranga-Ram • Eisenhardt, Peter R. M. • Moustakas, Leonidas A.

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 M_solar. 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.

Links

• PREPRINT http://arxiv.org/abs/astro-ph/0607507
• NED https://ned.ipac.caltech.edu/uri/NED::InRefcode/2006AJ....132.1405S
• ELECTR https://doi.org/10.1086%2F506347
• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2006AJ....132.1405S
• PDF https://stacks.iop.org/1538-3881/132/1405/pdf
• DATA https://archive.stsci.edu/mastbibref.php?bibcode=2006AJ....132.1405S
• DATA https://hst.esac.esa.int/ehst/#/pages/search;bibcode=2006AJ....132.1405S
• DATA https://irsa.ipac.caltech.edu/bibdata/2006/S/2006AJ....132.1405S.html
• SPIRES http://inspirehep.net/search?p=find+eprint+astro-ph/0607507