2000A&AS..142..433S


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.22CET15:51:12

2000A&AS..142..433S - Astron. Astrophys., Suppl. Ser., 142, 433-441 (2000/March-2)

X-ray and optical observations of three clusters of galaxies: Abell 901, Abell 1437, and Abell 3570.

SCHINDLER S.

Abstract (from CDS):

We analyse three clusters of galaxies, Abell 901 (z=0.17), Abell 1437 (z=0.13) and Abell 3570 (z=0.037). They have low to intermediate X-ray fluxes and an irregular morphology in the ROSAT All-Sky Survey (RASS). These clusters are chosen to test the abilities and limitations of the RASS in terms of cluster fluxes and cluster morphologies. Therefore some ``worst'' cases are used here. X-ray observations with the ROSAT/HRI and optical spectroscopic observations are carried out. The ROSAT/HRI observations, which have a much better spatial resolution than the RASS, reveal in two of the three cases a significantly different morphology than seen in the RASS. The reasons are point sources which could not be resolved in the RASS and were therefore confused with the cluster emission. For A3570 we could confirm the relaxed state of the cluster by the optical determination of a small velocity dispersion. In the cluster with the lowest flux (Abell 901) the countrate measurement is strongly affected by point sources, in the two other cases the countrate measurements of the RASS are reliable, i.e. they are reproduced by the ROSAT/HRI measurement. We conclude that for clusters with a flux of a few times 10–12erg/cm2/s or smaller, which show at the same time a non-relaxed morphology, the flux measurement of the RASS can be seriously affected by fore- or background sources. We point out that an all-sky survey of a second ABRIXAS mission would provide a much clearer source distinction for low-flux clusters and thus a much improved countrate determination.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: Abell 901, Abell 1437, Abell 3570 - intergalactic medium - cosmology: observations - X-rays: galaxies

Nomenclature: Table 2: [S2000b] JHHMMSS.s+DDMMSS N=3+17. Table 4: [S2000b] ACO 901 A (Nos A-F), [S2000b] ACO 1437 A (No. A), [S2000b] ACO 3570 A (Nos A-E).

Simbad objects: 36

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Number of rows : 36

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 851 ClG 09 42 56.6 +46 59 22           ~ 306 0
2 2MASX J09545764-1011498 GiC 09 54 57.6247653197 -10 11 50.544651494           ~ 2 0
3 2MASX J09553838-1010189 GiC 09 55 38.386 -10 10 18.94           ~ 4 0
4 ACO 901 ClG 09 55 56.9256 -10 01 46.519           ~ 97 1
5 [GGA2007] 80 X 09 56 18.1 -09 53 57           ~ 3 0
6 [S2000b] ACO 901 E ? 09 56 22.3 -09 55 07           ~ 2 0
7 2MASX J09562824-0957195 G 09 56 28.2150873960 -09 57 19.175255434   17       ~ 9 0
8 [GGA2007] 64 EB* 09 56 30.6 -10 00 12   14 13.06     ~ 4 0
9 [GGA2007] 62 X 09 56 35.3172215124 -10 04 54.483539260           ~ 2 0
10 [GGA2007] 3 X 09 56 35.6 -10 10 08           ~ 4 0
11 2MASX J09565328-1010146 GiC 09 56 53.3113843923 -10 10 15.142382118           ~ 2 0
12 ACO 1437 ClG 12 00 24.5 +03 19 52           ~ 61 0
13 2MASX J12005531+0326561 BiC 12 00 55.2745548687 +03 26 55.631478976   17.80   15.89   ~ 8 0
14 ESO 325-13 GiC 13 45 17.3763231523 -38 10 23.312778433   15.50   14.13   ~ 17 0
15 2MASX J13454616-3756488 GiC 13 45 46.1686463134 -37 56 48.295286874   15.93   14.51   ~ 13 0
16 2MASX J13454973-3737177 GiC 13 45 49.731 -37 37 17.79           ~ 2 0
17 2MASX J13461010-3800016 GiC 13 46 10.0741141149 -38 00 02.065788664   16.88   15.77   ~ 3 0
18 2MASX J13461861-3820196 GiC 13 46 18.6507283364 -38 20 19.244319165   16.74   15.44   ~ 8 0
19 ESO 325-16 BiC 13 46 23.9900022802 -37 58 15.856356232   14.91   13.48   ~ 32 1
20 ACO 3570 ClG 13 46 50 -37 55.0           ~ 48 3
21 [S2000b] J134654.0-375148 GiC 13 46 54.0 -37 51 48           ~ 1 0
22 2MASX J13470422-3803595 GiC 13 47 04.226 -38 03 59.56           ~ 2 0
23 2MASX J13470907-3755246 GiC 13 47 09.075 -37 55 24.60   16.53   15.09   ~ 6 0
24 2MASX J13471183-3807346 GiC 13 47 11.8260817470 -38 07 34.595218173   16.95   15.60   ~ 6 0
25 [S2000b] ACO 3570 A X 13 47 12.5 -37 57 15           ~ 1 0
26 [S2000b] ACO 3570 E PM* 13 47 15.5227911093 -37 45 06.442498381           ~ 1 0
27 2MASX J13472411-3751026 GiC 13 47 24.115 -37 51 02.63   16.84   15.43   ~ 3 0
28 [S2000b] ACO 3570 C X 13 47 25.6 -38 03 30           ~ 1 0
29 2MASX J13472741-3757556 GiC 13 47 27.418 -37 57 55.62   16.77   15.83   ~ 3 0
30 [S2000b] ACO 3570 B X 13 47 40.7 -37 50 38           ~ 1 0
31 2MASX J13474594-3750438 GiC 13 47 45.9510423845 -37 50 43.792013037           ~ 2 0
32 2MASX J13475124-3800549 GiC 13 47 51.2280892419 -38 00 54.737304919           ~ 2 0
33 2MASX J13475767-3756319 GiC 13 47 57.675 -37 56 31.93           ~ 7 0
34 2MASX J13480726-3816489 GiC 13 48 07.2991820152 -38 16 48.872405887   16.52   15.15   ~ 5 0
35 LEDA 618613 GiC 13 48 38.3 -37 43 41           ~ 2 0
36 2MASX J13491214-3755553 GiC 13 49 12.1212817654 -37 55 55.496694171   16.12   14.85   ~ 6 0

    Equat.    Gal    SGal    Ecl

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2020.02.22-15:51:12

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