2009ApJ...695..724H

Query : 2009ApJ...695..724H

2009ApJ...695..724H - Astrophys. J., 695, 724-731 (2009/April-2)

Clustering of red galaxies around the z = 1.53 quasar 3C 270.1.

HAAS M., WILLNER S.P., HEYMANN F., ASHBY M.L.N., FAZIO G.G., WILKES B.J., CHINI R., SIEBENMORGEN R. and STERN D.

Abstract (from CDS):

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 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 ≤ zphot≤ 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).

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Journal keyword(s): galaxies: clusters: individual: 3C270.1 - infrared: galaxies - quasars: general

Nomenclature: Table 1: [HWH2009] NN (Nos 1-29).

Simbad objects: 34

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Number of rows : 34
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
2 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
3 [HWH2009] 1 G 12 20 27.90 +33 43 11.5           ~ 1 0
4 [HWH2009] 2 G 12 20 28.72 +33 41 51.9           ~ 1 0
5 [HWH2009] 3 G 12 20 29.20 +33 42 10.5           ~ 1 0
6 [HWH2009] 4 G 12 20 30.06 +33 43 18.1           ~ 1 0
7 [HWH2009] 5 G 12 20 30.66 +33 44 50.0           ~ 1 0
8 [HWH2009] 6 G 12 20 30.73 +33 44 39.4           ~ 1 0
9 [HWH2009] 7 G 12 20 31.18 +33 43 14.1           ~ 1 0
10 [HWH2009] 8 G 12 20 32.49 +33 43 20.3           ~ 1 0
11 QSO B1223+338B QSO 12 20 32.6961968640 +33 43 55.976842884   19.41 18.91     ~ 11 0
12 [HWH2009] 9 G 12 20 33.50 +33 42 25.4           ~ 1 0
13 [HWH2009] 10 G 12 20 33.57 +33 44 08.3           ~ 1 0
14 [HWH2009] 11 G 12 20 33.85 +33 45 37.5           ~ 1 0
15 7C 1218+3359 QSO 12 20 33.8756544048 +33 43 12.026168040   18.80 18.61     ~ 271 1
16 [HWH2009] 12 G 12 20 33.90 +33 42 34.6           ~ 1 0
17 [HWH2009] 13 G 12 20 34.79 +33 41 55.4           ~ 1 0
18 [HWH2009] 14 G 12 20 34.95 +33 42 41.0           ~ 1 0
19 [HWH2009] 15 G 12 20 35.20 +33 42 09.6           ~ 1 0
20 [HWH2009] 16 G 12 20 35.88 +33 43 32.2           ~ 1 0
21 [HWH2009] 17 G 12 20 36.50 +33 43 30.6           ~ 1 0
22 [HWH2009] 18 G 12 20 37.70 +33 41 18.2           ~ 1 0
23 [HWH2009] 19 G 12 20 38.52 +33 43 04.2           ~ 1 0
24 [HWH2009] 20 G 12 20 38.78 +33 43 50.2           ~ 1 0
25 [HWH2009] 21 G 12 20 39.16 +33 44 31.9           ~ 1 0
26 [HWH2009] 22 G 12 20 40.10 +33 43 20.5           ~ 1 0
27 [HWH2009] 23 G 12 20 40.49 +33 43 21.9           ~ 1 0
28 [HWH2009] 24 G 12 20 40.55 +33 43 17.3           ~ 1 0
29 [HWH2009] 25 G 12 20 40.62 +33 43 00.2           ~ 1 0
30 [HWH2009] 26 G 12 20 43.31 +33 42 51.2           ~ 1 0
31 [HWH2009] 27 G 12 20 43.32 +33 44 19.8           ~ 1 0
32 [HWH2009] 28 G 12 20 44.17 +33 44 03.9           ~ 1 0
33 [HWH2009] 29 G 12 20 45.13 +33 43 18.9           ~ 1 0
34 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4

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