2004A&A...421..821V

Query : 2004A&A...421..821V

2004A&A...421..821V - Astronomy and Astrophysics, volume 421821-832 (2004/7-3)

Number counts of bright extremely red objects: Evolved massive galaxies at z ∼1.

VAEISAENEN P. and JOHANSSON P.H.

Abstract (from CDS):

We present results on number counts of Extremely Red Objects (EROs) in a 2850 arcmin2 near-infrared survey performed in European Large Area ISO Survey (ELAIS) fields at K<17.5. Counts of EROs are extended to brighter levels than available previously, giving 0.002±0.001arcmin–2 at K<16.5 and consistent numbers with literature values at fainter magnitudes. Photometric redshifts from HYPERZ as well as GRASIL model SEDs of galaxies imply that our EROs are located in the range z=0.7-1.5, with the bulk of the population at z∼1. Taking advantage of the ISO data in the fields, we use mid-IR detections to constrain the number of dusty EROs, and also discuss the superior capabilities of Spitzer Space Telescope to detect dusty EROs. Both the mid-IR data and the use of colour-colour diagrammes indicate that at most 10-20% of the EROs in this bright regime are dusty starbursting systems. The space density of our EROs, interpreted to be counterparts of local >2-3L* massive galaxies at around z∼1, is estimated to be ≃2x10–5Mpc–3, which is consistent with local values. Furthermore, the cumulative number counts at our bright magnitudes are remarkably well fitted by pure luminosity evolution models.

Abstract Copyright: ∼

Journal keyword(s): galaxies: evolution - galaxies: formation - infrared: galaxies - cosmology: observations - galaxies: starburst - galaxies: elliptical and lenticular, cD

Nomenclature: Table 1: [VJ2004b] NN (Nos 1-54).

Simbad objects: 54

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Number of rows : 54
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 [VJ2004b] 18 G 16 06 52.7 +54 46 37           ~ 1 0
2 [VJ2004b] 19 G 16 08 15.6 +54 41 52           ~ 1 0
3 SDSS J160838.73+550019.2 rG 16 08 38.73618 +55 00 19.2432           ~ 4 0
4 [VJ2004b] 1 G 16 08 57.0 +54 43 12           ~ 1 0
5 [VJ2004b] 21 G 16 08 59.4 +54 56 34           ~ 1 0
6 [VJ2004b] 2 G 16 08 59.8 +54 57 11           ~ 1 0
7 [VJ2004b] 22 G 16 09 00.0 +54 56 26           ~ 1 0
8 HSCS J160910.71+545637.8 G 16 09 10.71474 +54 56 37.8685           ~ 2 0
9 [VJ2004b] 23 G 16 10 21.0 +55 07 28           ~ 1 0
10 HSCS J161026.65+550407.2 G 16 10 26.65650 +55 04 07.2305           ~ 2 0
11 [VJ2004b] 24 G 16 10 30.3 +55 08 21           ~ 1 0
12 HSCS J161033.83+550931.4 G 16 10 33.83260 +55 09 31.4505           ~ 2 0
13 [VJ2004b] 51 G 16 10 35.1 +55 10 04           ~ 1 0
14 [VJ2004b] 25 G 16 10 40.4 +55 05 26           ~ 1 0
15 [VJ2004b] 6 G 16 10 41.2 +54 13 31           ~ 1 0
16 [VJ2004b] 7 G 16 10 42.8 +55 01 27           ~ 1 0
17 [VJ2004b] 8 G 16 10 45.2 +55 04 50           ~ 1 0
18 [VJ2004b] 26 G 16 10 51.0 +55 12 06           ~ 1 0
19 [VJ2004b] 27 G 16 10 59.1 +54 31 26           ~ 1 0
20 [VJ2004b] 28 G 16 11 08.9 +54 50 18           ~ 1 0
21 SDSS J161112.65+550823.5 AGN 16 11 12.667 +55 08 23.72       21.00 21.25 ~ 10 0
22 [VJ2004b] 52 G 16 11 13.3 +54 52 48           ~ 1 0
23 [VJ2004b] 30 G 16 11 14.7 +55 05 32           ~ 1 0
24 [VJ2004b] 9 G 16 11 19.1 +55 07 46           ~ 1 0
25 [VJ2004b] 31 G 16 11 58.4 +54 53 57           ~ 1 0
26 HSCS J161215.14+545338.2 G 16 12 15.14533 +54 53 38.2206           ~ 2 0
27 [VJ2004b] 32 G 16 34 14.4 +41 14 43           ~ 1 0
28 [VJ2004b] 53 G 16 34 21.4 +40 57 56           ~ 1 0
29 [VJ2004b] 33 G 16 34 22.8 +40 56 07           ~ 1 0
30 [VJ2004b] 12 G 16 34 45.9 +40 48 26           ~ 1 0
31 [VJ2004b] 34 G 16 34 52.1 +40 50 50           ~ 1 0
32 [VJ2004b] 35 G 16 34 58.4 +40 52 55           ~ 1 0
33 [VJ2004b] 36 G 16 35 12.1 +40 37 31           ~ 1 0
34 [VJ2004b] 11 G 16 35 12.2 +40 48 36           ~ 1 0
35 [VJ2004b] 54 G 16 35 46.0 +41 14 39           ~ 1 0
36 [VJ2004b] 37 G 16 36 01.0 +41 05 59           ~ 1 0
37 [VJ2004b] 38 G 16 36 07.5 +41 21 42           ~ 1 0
38 [VJ2004b] 39 G 16 36 07.8 +41 03 41           ~ 1 0
39 [VJ2004b] 13 G 16 36 17.9 +41 15 40           ~ 1 0
40 [VJ2004b] 14 G 16 36 52.8 +40 53 56           ~ 1 0
41 [VJ2004b] 40 G 16 36 58.1 +40 49 44           ~ 1 0
42 [VJ2004b] 41 G 16 37 23.9 +41 01 16           ~ 1 0
43 [VJ2004b] 42 G 16 37 27.5 +40 55 44           ~ 1 0
44 [VJ2004b] 43 G 16 37 31.0 +40 53 36           ~ 1 0
45 [VJ2004b] 44 G 16 37 38.6 +40 56 59           ~ 1 0
46 [VJ2004b] 15 G 16 37 39.6 +40 53 17           ~ 1 0
47 [VJ2004b] 45 G 16 37 40.2 +40 54 22           ~ 1 0
48 [VJ2004b] 46 G 16 37 49.6 +40 55 44           ~ 1 0
49 [VJ2004b] 47 G 16 37 57.2 +41 19 38           ~ 1 0
50 [VJ2004b] 48 G 16 37 58.1 +41 09 48           ~ 1 0
51 [VJ2004b] 16 G 16 38 01.3 +40 57 00           ~ 1 0
52 [VJ2004b] 49 G 16 38 20.3 +41 03 43           ~ 1 0
53 [VJ2004b] 17 G 16 38 33.7 +41 07 52           ~ 1 0
54 [VJ2004b] 50 G 16 38 46.1 +41 08 19           ~ 1 0

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