1998A&A...334..765A

Query : 1998A&A...334..765A

1998A&A...334..765A - Astronomy and Astrophysics, volume 334, 765-769 (1998/6-3)

Deep probing of the Coma cluster.

ADAMI C., NICHOL R.C., MAZURE A., DURRET F., HOLDEN B. and LOBO C.

Abstract (from CDS):

As a continuation of our study of the faint galaxy luminosity function in the Coma cluster of galaxies, we report here on the first spectroscopic observations of very faint galaxies (R≤21.5) in the direction of the core of this cluster. Out of these 34 galaxies, only one may have a redshift consistent with Coma, all others are background objects. The predicted number of Coma galaxies is 6.7±6.0, according to Bernstein et al. (1995AJ....110.1507B, B95). If we add the 17 galaxies observed by Secker (1997, Proc. "A new vision of an old cluster: untangling Coma Berenis", Marseille June 1997), we end up with 5 galaxies belonging to Coma, while the expected number is 16.0±11.0 according to B95. Notice that these two independent surveys lead to the same results. Although the observations and predicted values agree within the error, such results raise into question the validity of statistical subtraction of background objects commonly used to derive cluster luminosity functions (e.g. B95). More spectroscopic observations in this cluster and others are therefore urgently needed. As a by-product, we report on the discovery of a physical structure at a redshift z≃0.5.

Abstract Copyright: ∼

Journal keyword(s): cluster: individual: Coma cluster - clusters: general - galaxies: catalogs - galaxies: distances and redshifts - galaxies: luminosity function, mass function

Nomenclature: Table 1: [ANM98] +X.xx+Y.yy N=32.

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 [ANM98] +5.02+0.87 GiC 12 59 19.0 +27 54 17           ~ 1 0
2 [ANM98] +4.69-2.96 GiC 12 59 20.6 +27 50 27           ~ 1 0
3 [ANM98] +4.61+0.01 GiC 12 59 20.9 +27 53 26           ~ 1 0
4 [ANM98] +4.15+1.35 GiC 12 59 23.0 +27 54 46           ~ 1 0
5 [ANM98] +3.70-0.80 GiC 12 59 25.0 +27 52 37           ~ 1 0
6 [ANM98] +3.22-2.69 GiC 12 59 27.341 +27 50 43.24   24.37 23.45 22.96 22.87 ~ 2 0
7 [ANM98] +2.95+1.33 GiC 12 59 28.4 +27 54 45           ~ 1 0
8 [ANM98] +2.45-2.32 GiC 12 59 30.7 +27 51 06           ~ 1 0
9 CAIRNS J125933.66+275613.2 GiC 12 59 33.66 +27 56 13.2           ~ 2 0
10 CAIRNS J125934.26+275426.4 GiC 12 59 34.26 +27 54 26.4           ~ 2 0
11 CAIRNS J125935.57+275520.5 GiC 12 59 35.57 +27 55 20.5           ~ 2 0
12 [ANM98] +1.35-0.55 GiC 12 59 35.7 +27 52 52           ~ 1 0
13 NGC 4874 LIN 12 59 35.7093764280 +27 57 33.293892204 13.01 13.7 11.40 12.122 11.386 ~ 780 3
14 [ANM98] +1.26-0.75 GiC 12 59 36.1 +27 52 40           ~ 1 0
15 [ANM98] +1.08-0.22 GiC 12 59 36.9 +27 53 12           ~ 1 0
16 CAIRNS J125937.08+275329.5 GiC 12 59 37.08 +27 53 29.5           ~ 2 0
17 [ANM98] +0.83-1.30 GiC 12 59 38.0 +27 52 07           ~ 1 0
18 [ANM98] +0.62+0.15 GiC 12 59 39.0 +27 53 34           ~ 1 0
19 [ANM98] +0.20-0.92 GiC 12 59 40.9 +27 52 30           ~ 1 0
20 CAIRNS J125943.54+275619.8 G 12 59 43.533 +27 56 20.66 21.04 20.57 19.86 19.08 18.9 ~ 14 0
21 CAIRNS J125944.23+275227.8 GiC 12 59 44.23 +27 52 27.8           ~ 2 0
22 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4796 2
23 CAIRNS J125945.30+275536.8 GiC 12 59 45.30 +27 55 36.8           ~ 2 0
24 [ANM98] -0.93+2.03 GiC 12 59 46.0 +27 55 27           ~ 1 0
25 CAIRNS J125946.79+275603.3 GiC 12 59 46.79 +27 56 03.3           ~ 2 0
26 [ANM98] -1.72-1.26 GiC 12 59 49.6 +27 52 10           ~ 1 0
27 [ANM98] -1.95+2.25 GiC 12 59 50.6 +27 55 41           ~ 1 0
28 [ANM98] -2.15-1.56 GiC 12 59 51.5 +27 51 52           ~ 1 0
29 [ANM98] -2.37+1.11 GiC 12 59 52.5 +27 54 32           ~ 1 0
30 [ANM98] -2.61+2.64 GiC 12 59 53.6 +27 56 04           ~ 1 0
31 [ANM98] -2.77+1.41 GiC 12 59 54.3 +27 54 50           ~ 1 0
32 [ANM98] -2.81+0.58 GiC 12 59 54.5 +27 54 00           ~ 1 0
33 [ANM98] -3.03+0.37 GiC 12 59 55.5 +27 53 48           ~ 1 0
34 [ANM98] -3.14+1.22 GiC 12 59 56.0 +27 54 39           ~ 1 0
35 NGC 4889 EmG 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 704 1

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