1999A&A...341....8R

Query : 1999A&A...341....8R

1999A&A...341....8R - Astronomy and Astrophysics, volume 341, 8 (1999/1-1)

ROSAT observations of the Sculptor galaxy NGC 7793.

READ A.M. and PIETSCH W.

Abstract (from CDS):

We report here the results of spectral imaging observations with the ROSAT PSPC of the field surrounding the very nearby (D=3.38Mpc) Sculptor galaxy, NGC 7793. Many point sources are detected within the field, several of them showing evidence for variability. Seven sources are seen to lie within the optical confines of the system, the brightest (LX≃9x1038erg/s), lying to the southern edge of NGC 7793. This source, also observed to be variable, is seen now, not to be associated with a z=0.071 redshift QSO, as was previously thought. A number of the other sources within the NGC 7793 disc are likely to be due to X-ray binaries, supernova remnants or superbubbles within the galaxy itself. Other sources may be associated with background AGN. In addition to the point source emission, rather uniform unresolved emission is detected in and around NGC 7793 extending to a radius of perhaps 4kpc. This emission is likely to be contaminated to some degree by unresolved point sources, as its temperature (kT≃1keV) is rather hotter than is seen for the diffuse gas components in other nearby spiral galaxies. Comparing the X-ray properties of NGC 7793 with those of the remaining Sculptor group members, suggests that it may, in terms of activity, lie somewhere between its quiescent and starburst neighbours.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Sculptor - galaxies: individual: NGC 7793 - galaxies: ISM - X-rays: galaxies

Nomenclature: Table 1: [RP99] PNN (Nos P1-P27).

Simbad objects: 45

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Number of rows : 45
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 24 EmG 00 09 56.542 -24 57 47.27 12.12 12.20 11.58 11.46 11.5 ~ 249 1
2 NGC 45 Sy2 00 14 04.0072128696 -23 10 55.132646808 11.92 11.21 10.73 10.58 10.4 ~ 255 1
3 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 778 2
4 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 441 2
5 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3336 2
6 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1503 2
7 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 509 0
8 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1359 4
9 SN 1986J SN* 02 22 31.33 +42 19 56.4   18.4 18.4     SNII 322 1
10 SN 1978K SN* 03 17 38.620 -66 33 03.40   13.0       SNII 205 1
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17434 0
12 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1417 1
13 SN 1979C SN* 12 22 58.58 +15 47 52.7   11.6       SNIIL 585 1
14 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2914 2
15 SN 1980K SN* 20 35 30.07 +60 06 23.7   11.6       SNIIL 464 1
16 2MASX J23565719-3243301 G 23 56 57.1801229208 -32 43 30.075177972   13.9       ~ 1 0
17 [RP99] P24 X 23 56 57.5 -32 46 34   22.3       ~ 1 0
18 [RP99] P16 G 23 57 12.0 -32 38 22   18.3       ~ 1 0
19 [RP99] P1 X 23 57 12.9 -32 23 57   24.1       ~ 2 0
20 [RP99] P26 * 23 57 14.0 -32 47 11   19.4       ~ 1 0
21 [RP99] P17 X 23 57 17.8 -32 39 50   21.2       ~ 1 0
22 [RP99] P18 G 23 57 25.3 -32 42 28   12.6       ~ 1 0
23 [RP99] P14 * 23 57 31.5 -32 37 25   20.3       ~ 1 0
24 [RP99] P25 X 23 57 41.8 -32 46 53   21.2       ~ 1 0
25 [RP99] P5 X 23 57 44.3 -32 28 46   23.0       ~ 1 0
26 [RP99] P10 X 23 57 47.1 -32 36 05           ~ 3 0
27 [RP99] P6 * 23 57 48.5 -32 32 30   16.1       ~ 3 0
28 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1107 2
29 [RP99] P23 X 23 57 49.9 -32 45 48   21.7       ~ 1 0
30 NAME NGC 7793 P13 ULX 23 57 50.90 -32 37 26.6           ~ 190 0
31 [RP99] P21 G 23 57 51.4 -32 42 53   19.1       ~ 1 0
32 LEDA 3096760 SyG 23 57 52.5541781128 -32 38 17.023671824     18.2     ~ 8 0
33 2MASS J23575272-3233100 HXB 23 57 52.7679474360 -32 33 09.809798940   17.9       ~ 4 0
34 [RP99] P4 * 23 57 53.1 -32 28 10   21.3       ~ 1 0
35 [BL97] N7793-S24 SR? 23 57 58.950 -32 36 06.75           ~ 8 0
36 [BL97] N7793-S26 SNR 23 58 00.27 -32 33 22.1           ~ 57 0
37 [RP99] P11 X 23 58 03.1 -32 36 34           ~ 3 0
38 [RP99] P9 X 23 58 08.70 -32 34 03.7   21.2       ~ 10 0
39 [RP99] P27 * 23 58 21.2 -32 47 17   18.8       ~ 1 0
40 [RP99] P20 X 23 58 28.5 -32 42 50   20.9       ~ 1 0
41 [RP99] P2 * 23 58 28.8 -32 24 42   20.8       ~ 1 0
42 [RP99] P15 X 23 58 32.6 -32 38 16   20.9       ~ 1 0
43 [RP99] P12 G 23 58 38.6 -32 37 10   18.3       ~ 1 0
44 [RP99] P3 * 23 58 42.4 -32 26 09   19.5       ~ 1 0
45 [RP99] P19 * 23 58 50.0 -32 42 45   19.3       ~ 1 0

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