2004A&A...422..453V


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST07:11:12

2004A&A...422..453V - Astronomy and Astrophysics, volume 422, 453-463 (2004/8-1)

An overdensity of extremely red objects around faint mid-IR galaxies.

VAEISAENEN P. and JOHANSSON P.H.

Abstract (from CDS):

We have searched for Extremely Red Objects (EROs) around faint mid-IR selected galaxies in ELAIS fields. We find a significant overdensity, by factors of 2 to 5, of these EROs compared to field EROs in the same region and literature random field ERO counts. The excess is similar to that found previously in the fields of known high redshift quasars and AGN. While with the present data it cannot be definitely shown whether the overdensity is physically connected to the mid-IR source, a derived radial distribution does suggest this. The fraction of EROs among K-selected galaxies is high in the mid-IR fields in agreement with the picture that the EROs responsible for the overdensity are members of high redshift clusters of galaxies. We find R-K>5 selected EROs to be more clustered around the mid-IR galaxies than I-K>4 EROs, though statistics are weak because of small numbers. However, this would be consistent with a cluster/galaxy group scenario if, as we argue, the former colour selection finds preferentially more strongly clustered early type galaxies, whereas the latter selection includes a larger fraction of dusty EROs. Finally, using the mid-IR data, we are able to limit the fraction of ULIRG type very dusty EROs at K<18 mag to less than ∼10% of the total ERO population.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - infrared: galaxies - cosmology: observations - galaxies: clusters: general

Nomenclature: Table 2: [VJ2004a] NN (Nos 1-40).

Status in Simbad:  will not be processed

CDS comments: Table 4, col(1): numbering 'NN' not used in SIMBAD, objects are ELAISC15 JHHMMSS+DDMMSS in SIMBAD, as in col(2).

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 ELAISC15 J160718+544406 IR 16 07 18.90 +54 44 06.2           ~ 3 0
2 SWIRE J160741.21+550153.7 G 16 07 41.24 +55 01 53.7 22.69         ~ 4 0
3 ELAISC15 J161013+550648 IR 16 10 13.46 +55 06 48.6           ~ 3 0
4 ELAISC15 J161101+543331 IR 16 11 01.31 +54 33 31.5           ~ 3 0
5 2MASS J16110311+5432224 IR 16 11 03.117 +54 32 22.48 21.13         ~ 3 0
6 2MASS J16335914+4109152 IR 16 33 59.144 +41 09 15.24           ~ 3 0
7 2MASX J16341416+4103188 G 16 34 14.195 +41 03 19.05 19.82         ~ 8 0
8 ELAISC15 J163417+405653 IR 16 34 17.87 +40 56 52.3 22.41         ~ 4 0
9 EMNO 7 AGN 16 35 15.6548 +40 56 07.706 22.98       22.52 ~ 8 0
10 [VV96] J163531.2+410024 QSO 16 35 31.0615626814 +41 00 27.382489228 18.07 19.42 19.09   18.50 ~ 33 0
11 5MUSES 264 G 16 35 41.69 +40 59 00.4 20.34         ~ 6 0
12 ELAISC15 J163543+410750 IR 16 35 43.16 +41 07 51.2           ~ 4 0
13 ELAISC15 J163615+404759 IR 16 36 15.77 +40 47 59.1           ~ 5 0
14 ELAISC15 J163629+411441 IR 16 36 29.10 +41 14 41.8           ~ 3 0
15 2MASS J16363999+4055382 IR 16 36 39.997 +40 55 38.24 20.93         ~ 3 0
16 [VV2006] J163655.8+405909 QSO 16 36 55.769 +40 59 09.86 22.63   23.07 23.00 23.02 ~ 20 0
17 ELAISC15 J163730+410447 IR 16 37 30.93 +41 04 47.3 21.76         ~ 3 0

    Equat.    Gal    SGal    Ecl

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2019.10.18-07:11:12

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