2004MNRAS.351....1S

Query : 2004MNRAS.351....1S

2004MNRAS.351....1S - Mon. Not. R. Astron. Soc., 351, 1-17 (2004/June-2)

Chandra and XMM-Newton observations of NGC 5253: analysis of the X-ray emission from a dwarf starburst galaxy.

SUMMERS L.K., STEVENS I.R., STRICKLAND D.K. and HECKMAN T.M.

Abstract (from CDS):

We present Chandra and XMM-Newton X-ray data of NGC 5253, a local starbursting dwarf elliptical galaxy, in the early stages of a starburst episode. Contributions to the X-ray emission come from discrete point sources and extended diffuse emission, in the form of what appear to be multiple superbubbles, and smaller bubbles probably associated with individual star clusters. Chandra detects 17 sources within the optical extent of NGC 5253 down to a completeness level corresponding to a luminosity of 1.5 x 1037 erg/s. The slope of the point-source X-ray luminosity function is -0.54±0.210.16, similar to that of other nearby dwarf starburst galaxies. Several different types of source are detected within the galaxy, including X-ray binaries and the emission associated with star clusters.

Comparison of the diffuse X-ray emission with the observed Hα emission shows similarities in their extent. The best spectral fit to the diffuse emission is obtained with an absorbed, two-temperature model giving temperatures for the two gas components of ∼0.24 and ∼0.75 keV. The derived parameters of the diffuse X-ray emitting gas are as follows: a total mass of ∼1.4x106f1/2 M☉, where f is the volume-filling factor of the X-ray emitting gas, and a total thermal energy content for the hot X-ray emitting gas of ∼3.4 x 1054f1/2 erg. The pressure in the diffuse gas is P/k∼ 106f–1/2 K/cm3. We find that these values are broadly commensurate with the mass and energy injection from the starburst population. Analysis of the kinematics of the starburst region suggests that the stellar ejecta contained within it can escape the gravitational potential well of the galaxy, and pollute the surrounding intergalactic medium.


Abstract Copyright: 2004 RAS

Journal keyword(s): ISM: jets and outflows - galaxies: individual: NGC 5253 - galaxies: starburst - X-rays: galaxies

Nomenclature: Table 2: [SSS2004] NN (Nos 1-31).

Simbad objects: 39

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Number of rows : 39
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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
2 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
3 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 808 0
4 Z 266-55 AGN 10 32 31.956 +54 24 03.53 13.29 13.66 13.13 12.71 12.27 ~ 381 1
5 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 1017 1
6 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1192 1
7 CXOU J133937.7-314015 X 13 39 37.73 -31 40 15.8           ~ 1 0
8 CXOU J133939.1-313606 X 13 39 39.16 -31 36 06.9           ~ 1 0
9 CXOU J133939.1-313609 X 13 39 39.17 -31 36 09.2           ~ 1 0
10 CXOU J133943.1-313920 X 13 39 43.15 -31 39 20.2           ~ 1 0
11 CXOU J133945.1-313658 X 13 39 45.12 -31 36 58.2           ~ 1 0
12 CXOU J133945.5-314206 X 13 39 45.53 -31 42 06.1           ~ 1 0
13 CXOU J133946.6-314228 X 13 39 46.69 -31 42 28.0           ~ 1 0
14 [SSS2004] 8 X 13 39 47.27 -31 41 40.7           ~ 1 0
15 [SSS2004] 9 HXB 13 39 50.66 -31 39 20.7           ~ 3 0
16 [SSS2004] 10 HXB 13 39 51.17 -31 38 40.8           ~ 3 0
17 CXOU J133951.6-314016 X 13 39 51.62 -31 40 16.2           ~ 1 0
18 CXOU J133951.9-314143 X 13 39 51.96 -31 41 43.9           ~ 1 0
19 CXOU J133952.0-313859 HXB 13 39 52.07 -31 38 59.7           ~ 2 0
20 SN 1972E SN* 13 39 52.7 -31 40 09   8.49 8.30     SNIa 309 1
21 CXOU J133953.3-314343 X 13 39 53.36 -31 43 43.9           ~ 1 0
22 [OWB2005] NGC 5253 P1 HXB 13 39 53.80 -31 38 32.7           ~ 4 0
23 CXOU J133955.3-313833 HXB 13 39 55.41 -31 38 33.6           ~ 5 0
24 CXOU J133955.6-313831 X 13 39 55.69 -31 38 31.5           ~ 2 0
25 [SSS2004] 18 HXB 13 39 55.85 -31 38 22.8           ~ 2 0
26 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
27 CXOU J133956.0-313824 HXB 13 39 56.04 -31 38 24.8           ~ 2 0
28 CXOU J133956.1-313835 HXB 13 39 56.15 -31 38 35.9           ~ 2 0
29 [SSS2004] 21 HXB 13 39 56.35 -31 38 20.5           ~ 3 0
30 [SSS2004] 22 HXB 13 39 56.45 -31 38 25.8           ~ 2 0
31 CXOU J133956.6-314245 X 13 39 56.67 -31 42 45.3           ~ 1 0
32 [SSS2004] 24 HXB 13 39 57.43 -31 37 32.5           ~ 2 0
33 [SSS2004] 25 HXB 13 39 59.27 -31 37 50.2           ~ 3 0
34 [SSS2004] 26 HXB 13 40 02.19 -31 37 19.1           ~ 3 0
35 [SSS2004] 27 HXB 13 40 03.40 -31 37 14.5           ~ 3 0
36 CXOU J134003.8-314403 X 13 40 03.84 -31 44 03.7           ~ 1 0
37 [SSS2004] 29 HXB 13 40 04.29 -31 37 30.3           ~ 3 0
38 CXOU J134004.9-314203 X 13 40 04.97 -31 42 03.0           ~ 1 0
39 CXOU J134010.8-314033 X 13 40 10.81 -31 40 33.2           ~ 1 0

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