Martin Haas et al. 2009 ApJ 695 724 doi:10.1088/0004-637X/695/1/724
CLUSTERING OF RED GALAXIES AROUND THE z = 1.53 QUASAR 3C 270.1
FREE ISSUEMartin Haas1, S. P. Willner2,5, Frank Heymann1,3, M. L. N. Ashby2,5, G. G. Fazio2, Belinda J. Wilkes2, Rolf Chini1, Ralf Siebenmorgen3 and Daniel Stern4
Show affiliationsIn 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 3C 270.1 with the Spitzer Space Telescope at 3.6-24 μm and with the 6.5 m MMT in the z' and Y bands allow the 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 protocluster around the quasar. The spectral energy distributions of 3/4 of the EROs are better fitted with passive elliptical galaxies than with dust-reddened starbursts, and of four sources well detected on an archival Hubble Space Telescope (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 (2σ) 24 μm detection indicating a dust-enshrouded starburst. The EROs are more luminous than L 
(H = –23.6 AB mag at z 
1.5).
- Keywords
galaxies: clusters: individual (3C270.1); infrared: galaxies; quasars: general
- Dates
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Issue 1 (2009 April 10)
Received 2008 August 24, accepted for publication 2009 January 13
Published 2009 April 1
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Clustering of Red Galaxies Around the z = 1.53 Quasar 3C 270.1
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