Clustering of red galaxies around the z=1.53 quasar 3C270.1

Details Clustering of red galaxies around the z=1.53 quasar 3C270.1 Clustering of red galaxies around the z=1.53 quasar 3C270.1

2009-01-05

arxiv.org/abs/0901.0452v1

Astrophys.J.695:724-731,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

12 pages, 7 figures, accepted by ApJ

Scientific paper

10.1088/0004-637X/695/1/724

In the paradigm of hierarchical galaxy formation, luminous radio galaxies mark mass assembly peaks that should contain clusters of galaxies. Observations of the z=1.53 quasar 3C270.1 with the Spitzer Space Telescope at 3.6-24 micron and with the 6.5-m MMT in the z'- and Y-bands allow detection of potential cluster members via photometric redshifts. Compared with nearby control fields, there is an excess of 11 extremely red objects (EROs) at 1.33 < z_phot < 1.73, consistent with a proto-cluster around the quasar. The spectral energy distributions (SEDs) of 3/4 of the EROs are better fitted with passive elliptical galaxies than withdust-reddened starbursts, and of four sources well-detected on an archival HST snapshot image, all have undisturbed morphologies. However, one ERO, not covered by the HST image, is a double source with 0.8" separation on the z' image and a marginal (2sigma) 24 micron detection indicating a dust-enshrouded starburst. The EROs are more luminous than L* (H = -23.6 AB mag at z=1.5).

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