1997A&A...318..361T

Query : 1997A&A...318..361T

1997A&A...318..361T - Astronomy and Astrophysics, volume 318, 361-375 (1997/2-2)

ROSAT PSPC observations of 5 X-ray bright early type galaxies.

TRINCHIERI G., FABBIANO G. and KIM D.-W.

Abstract (from CDS):

We report on the ROSAT PSPC observations of 5 X-ray bright early-type galaxies. Their X-ray morphology is more complex than Einstein data had shown, ranging from the ellipsoidal shape of NGC 533 to the ∼200kpc tail of NGC 7619. Hot gas at an average temperature of 0.8-1keV dominates their X-ray emission. The spectral analysis is based on the assumption of a hot thin plasma at cosmic abundances, since the spectral resolution of the PSPC does not allow unambiguous measures of the model parameters (temperatures, low energy cut-off, metal abundance). However, the estimated temperature are not strongly affected by this choice. A temperature distribution of the hot interstellar medium is also derived. Higher temperatures are in some cases observed at larger radii, while the innermost 1' region is cooler in all of the objects studied. Due to the large range in distances however this corresponds to significantly different galaxy radii, from 5kpc in NGC 4649 to 30kpc in NGC 533. The temperature and density distributions derived are used to estimate the total mass of these systems, which span from MT∼1012-1013M☉ and corresponding mass-to-light ratios M/L∼10-150 in solar units. Formal errors on the derived masses are estimated to be >25%. Care must be taken in comparing results for different systems, since some of the emission attributed to these objects could suffer from the contribution for the groups and clusters they belong to. Accordingly, our mass estimates could reflect the effect of the cluster/group potential.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual: NGC 533 - galaxies: individual: NGC 2563 - galaxies: individual: NGC 4649 - galaxies: individual: NGC 7619 - galaxies: individual: NGC 7626 - X-rays: galaxies

Nomenclature: Table 6: [TFK97] Peg I NN (Nos 1-11). Table 7: [TFK97] NGC 2563 NN (Nos 1-27).

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 - 2024 		#notes
1 NGC 507 BiC 01 23 39.950 +33 15 22.22   13.0       ~ 440 3
2 NGC 521 LSB 01 24 33.7729923840 +01 43 52.911826680   12.5   12.3 12.0 ~ 111 0
3 NGC 533 GiG 01 25 31.4074984248 +01 45 33.236656812   13.1 14.11     ~ 227 0
4 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1570 1
5 [TFK97] NGC 2563 1 X 08 18 38.5 +20 46 43           ~ 1 0
6 [TFK97] NGC 2563 2 X 08 18 40.3 +21 02 16           ~ 1 0
7 [TFK97] NGC 2563 3 X 08 18 52.6 +21 23 25           ~ 1 0
8 NGC 2557 LIN 08 19 10.7409346440 +21 26 08.859066540   14.6       ~ 47 0
9 [TFK97] NGC 2563 5 X 08 19 13.2 +21 10 50           ~ 1 0
10 Z 119-53 GiG 08 19 19.7925848664 +21 03 31.880836692   15.5       ~ 70 0
11 [TFK97] NGC 2563 7 X 08 19 28.9 +21 10 49           ~ 1 0
12 [TFK97] NGC 2563 8 X 08 19 34.6 +20 57 09           ~ 1 0
13 SDSS J081936.68+204248.4 QSO 08 19 36.6853144824 +20 42 48.489038100   19.74 19.51     ~ 22 0
14 UGC 4332 Sy2 08 19 37.7 +21 06 53   15.96 14.89     ~ 88 0
15 [TFK97] NGC 2563 10 X 08 19 40.3 +21 06 27           ~ 1 0
16 [TFK97] NGC 2563 11 X 08 19 47.1 +21 18 13           ~ 1 0
17 NGC 2560 LIN 08 19 51.8925748104 +20 59 05.944189164   14.9       ~ 60 0
18 [TFK97] NGC 2563 13 X 08 19 52.9 +21 01 32           ~ 1 0
19 [TFK97] NGC 2563 14 X 08 19 58.6 +21 07 02           ~ 1 0
20 [TFK97] NGC 2563 15 X 08 20 02.5 +20 55 28           ~ 1 0
21 [TFK97] NGC 2563 16 X 08 20 18.0 +21 13 35           ~ 1 0
22 [TFK97] NGC 2563 17 X 08 20 20.1 +21 05 07           ~ 1 0
23 NGC 2562 LIN 08 20 23.6548261560 +21 07 53.266910376   14.0       ~ 69 0
24 [TFK97] NGC 2563 19 X 08 20 30.6 +20 56 15           ~ 1 0
25 [TFK97] NGC 2563 20 X 08 20 33.2 +21 24 47           ~ 1 0
26 NGC 2563 GiG 08 20 35.6870161656 +21 04 04.111020012   13.7 12.39     ~ 155 1
27 [TFK97] NGC 2563 21 X 08 20 42.1 +20 57 19           ~ 1 0
28 [TFK97] NGC 2563 22 X 08 20 43.4 +21 08 30           ~ 1 0
29 NAME Cancer Cluster ClG 08 20 54 +21 04.5           ~ 155 0
30 [TFK97] NGC 2563 23 X 08 21 01.5 +21 28 48           ~ 1 0
31 [TFK97] NGC 2563 24 X 08 21 02.6 +20 47 31           ~ 1 0
32 [TFK97] NGC 2563 25 X 08 21 07.1 +21 17 26           ~ 1 0
33 [TFK97] NGC 2563 26 * 08 21 24.7029821592 +21 27 26.674520940           ~ 1 0
34 2MASX J08221623+2105334 LIN 08 22 16.232 +21 05 33.48   15.5       ~ 23 0
35 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1223 0
36 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6645 0
37 NAME NGC 4636 Group GrG 12 42 49.5 +02 41 08           ~ 562 0
38 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1117 1
39 M 60 GiP 12 43 39.9680 +11 33 09.696   10.3       ~ 1348 1
40 NGC 5044 BiC 13 15 23.9607836592 -16 23 07.547751744   11.9   10.74   ~ 501 0
41 [TFK97] Peg I 1 X 23 19 26.3 +08 07 26           ~ 1 0
42 [TFK97] Peg I 2 X 23 19 28.6 +08 17 21           ~ 1 0
43 RX J2319.6+0819 X 23 19 37.1 +08 19 32           ~ 4 0
44 [TFK97] Peg I 5 X 23 20 11.1 +08 07 54           ~ 1 0
45 RX J2320.1+0810 GrG 23 20 11.3 +08 12 05           ~ 6 0
46 NGC 7619 GiG 23 20 14.524 +08 12 22.63   12.7       ~ 449 0
47 [TFK97] Peg I 6 X 23 20 33.0 +08 18 30           ~ 1 0
48 [TFK97] Peg I 7 X 23 20 38.1 +08 21 26           ~ 1 0
49 NGC 7626 rG 23 20 42.524 +08 13 01.43   12.8       ~ 426 1
50 RX J2320.7+0829 X 23 20 50.28 +08 29 30.8           ~ 2 0
51 [TFK97] Peg I 9 X 23 20 55.1 +08 02 46           ~ 1 0
52 NAME Peg I ClG 23 21 +08.3           ~ 70 0
53 1RXS J232112.6+081017 X 23 21 12.6 +08 10 17           ~ 1 0
54 [TFK97] Peg I 11 X 23 21 31.6 +08 02 05           ~ 1 0

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