2001ApJ...554..202I

Query : 2001ApJ...554..202I

2001ApJ...554..202I - Astrophys. J., 554, 202-215 (2001/June-2)

ROSAT X-ray observations of the spiral galaxy M81.

IMMLER S. and WANG Q.D.

Abstract (from CDS):

We present results from the analysis of deep ROSAT HRI and PSPC observations of the spiral galaxy M81. The inferred total (0.5-2 keV band) luminosity of M81 is ∼3x1040 ergs.s–1, excluding the contribution from identified interlopers found within the D25 ellipse. The nucleus of the galaxy alone accounts for about 65% of this luminosity. The rest is due to 26 other X-ray sources (contributing ∼10%) and to apparently diffuse emission, which is seen across much of the galactic disk and is particularly bright in the bulge region around the nucleus. Spectral analysis further gives evidence for a soft component, which can be characterized by a two-temperature optically thin plasma with temperature at ∼0.15 and 0.60 keV and an absorption of the galactic foreground only. These components, accounting for ∼13% of the X-ray emission from the region, apparently arise in a combination of hot gas and faint discrete sources. We find interesting spatial coincidences of luminous (1037-1040 ergs.s–1) and variable X-ray sources with shock-heated optical nebulae. Three of them are previously classified as supernova remnant candidates. The other one is far off the main body of M81 but is apparently associated with a dense H I concentration produced most likely by the tidal interactions of the galaxy with its companions. These associations suggest that such optical nebulae may be powered by outflows from luminous X-ray binaries, which are comparable to, or more luminous than, Galactic ``microquasars.''

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Individual: Messier Number: M81 - Galaxies: General - Galaxies: Spiral - X-Rays: Galaxies - X-Rays: General - X-Rays: ISM

VizieR on-line data: <Available at CDS (J/ApJ/554/202): table3.dat table4.dat table5.dat table6.dat>

Nomenclature: Table 3: [IW2001] HNN (Nos H1-H46). Table 4: [IW2001] PNN (Nos P1-P69).

Simbad objects: 90

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Number of rows : 90
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 X LMC X-1 HXB 05 39 38.8284304464 -69 44 35.531553624   14.8 14.5 14.924   O8(f)p 700 0
3 [IW2001] P1 X 09 52 39.86 +69 03 59.8     16.52     ~ 2 0
4 [IW2001] P2 X 09 52 44.0 +69 02 52           ~ 1 0
5 [IW2001] P3 X 09 52 47.4 +69 09 01           ~ 1 0
6 [IW2001] P4 X 09 52 49.86 +68 59 25.3           ~ 2 0
7 [IW2001] P5 X 09 52 59.76 +69 07 43.1           ~ 2 0
8 GSC 04383-01079 X 09 53 10.04 +69 00 07.6     16.72     ~ 2 0
9 USNO-A2.0 1575-03022008 X 09 53 17.01 +69 06 46.0     20.83     ~ 2 0
10 [IW2001] P8 X 09 53 27.53 +69 04 19.3           ~ 2 0
11 TYC 4383-727-1 PM* 09 53 27.8973445008 +68 58 43.213881576   12.22 11.31 11.0   ~ 4 0
12 [IW2001] P10 X 09 53 37.0 +69 05 36           ~ 1 0
13 SDSS J095341.90+685917.4 BiC 09 53 41.904 +68 59 17.44   22.2 21.11     ~ 4 0
14 [IW2001] P12 X 09 53 43.6 +69 16 00           ~ 1 0
15 USNO-A2.0 1575-03022935 X 09 53 49.15 +68 52 42.2           ~ 1 0
16 [IW2001] P14 X 09 53 51.88 +69 02 49.9           ~ 2 0
17 [LB2005] NGC 3031 X22 X 09 53 57.04 +69 03 57.0           ~ 3 0
18 [IW2001] H7 X 09 54 16.49 +69 16 27.8           ~ 1 0
19 [IW2001] P16 X 09 54 21.0 +69 00 03           ~ 1 0
20 [IW2001] P17 X 09 54 21.7 +68 54 36           ~ 1 0
21 [IW2001] P18 X 09 54 33.16 +68 52 29.0           ~ 2 0
22 USNO-A2.0 1575-03024392 X 09 54 39.3 +69 19 13           ~ 1 0
23 [IW2001] P20 X 09 54 41.3 +69 04 51           ~ 1 0
24 [IW2001] H9 X 09 54 41.966 +69 02 43.71           ~ 3 0
25 GSC 04383-00613 SB* 09 54 45.3326590200 +68 56 59.091599220   12.8 13.81 12.26   ~ 7 0
26 USNO-A2.0 1575-03024612 X 09 54 47.6 +69 11 22           ~ 1 0
27 [LB2005] NGC 3031 X12 X 09 55 00.054 +69 07 44.96     22.7     ~ 7 0
28 [IW2001] P24 X 09 55 00.2 +69 19 14           ~ 1 0
29 BD+69 541B PM* 09 55 01.0230525048 +68 56 22.460563788   11.33 10.58 10.409   G 10 0
30 [IW2001] P26 X 09 55 01.665 +69 10 40.34           ~ 3 0
31 [IW2001] H12 X 09 55 02.43 +68 50 50.9           ~ 1 0
32 PSK 136 HII 09 55 05.733 +68 58 53.03           ~ 5 0
33 [LB2005] NGC 3031 X6 SNR 09 55 09.7677914952 +69 04 07.639352256   18.64 18.13     ~ 15 0
34 [LB2005] NGC 3031 X7 X 09 55 10.278 +69 05 02.34     22.79     ~ 9 0
35 [IW2001] P30 SNR 09 55 10.602 +69 08 43.17     22.86     ~ 7 0
36 [IW2001] P32 X 09 55 14.384 +69 12 35.51           ~ 4 0
37 [IW2001] H16 X 09 55 21.8839591800 +69 06 37.632821616     17.14     ~ 4 0
38 [LB2005] NGC 3031 X4 X 09 55 22.111 +69 05 10.56           ~ 4 0
39 2E 2194 X 09 55 24.260 +69 09 57.25           ~ 8 0
40 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1507 1
41 [IW2001] H19 X 09 55 25.78 +69 15 49.8           ~ 2 0
42 [IW2001] H20 X 09 55 28.822 +69 06 13.07           ~ 3 0
43 [FK2005] 7 SNR 09 55 32.95 +69 00 33.6   23.87 23.89     ~ 86 1
44 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
45 [F88] X-5 X 09 55 33.32 +69 03 57.5     15.42     ~ 10 0
46 [IW2001] H23 X 09 55 35.244 +69 03 16.10           ~ 3 0
47 [IW2001] H24 X 09 55 35.306 +68 55 11.79           ~ 3 0
48 [IW2001] P39 X 09 55 41.0 +69 17 21           ~ 1 0
49 NAME M81-ULS1 ULX 09 55 42.146 +69 03 36.51     21.67     ~ 33 0
50 [IW2001] H27 X 09 55 43.732 +68 59 05.29           ~ 3 0
51 PSK 284 HII 09 55 47.002 +69 05 51.16     18.63     ~ 5 0
52 [IW2001] H29 X 09 55 49.388 +68 58 36.86           ~ 3 0
53 [IW2001] H30 X 09 55 49.399 +69 08 11.67           ~ 3 0
54 CXO J095549.7+690531 LXB 09 55 49.7917670976 +69 05 31.963477596   22.04 20.77   19.92 ~ 16 0
55 [SPZ2011] 151 LXB 09 55 58.542 +69 05 26.07     26.37     ~ 4 0
56 [IW2001] H33 X 09 56 01.925 +68 58 59.74           ~ 3 0
57 [IW2001] H34 X 09 56 02.655 +68 59 35.66           ~ 3 0
58 [LB2005] NGC 3031 X11 X 09 56 08.982 +69 01 06.92           ~ 5 0
59 [LB2005] NGC 3031 X23 X 09 56 09.128 +69 12 48.17           ~ 4 0
60 [IW2001] H37 X 09 56 13.556 +69 06 31.50     24.75     ~ 3 0
61 2MASS J09561381+6857239 * 09 56 13.7980778784 +68 57 24.029934480           ~ 8 0
62 USNO-A2.0 1575-03027973 X 09 56 36.87 +69 00 30.1           ~ 1 0
63 GSC 04383-00776 X 09 56 43.7 +68 53 51           ~ 1 0
64 [IW2001] P50 X 09 56 46.0 +68 54 40           ~ 1 0
65 [IW2001] P51 X 09 56 52.0 +69 07 41           ~ 1 0
66 [IW2001] P52 X 09 56 52.6 +69 10 42           ~ 1 0
67 [IW2001] P53 X 09 56 52.9 +69 11 59           ~ 1 0
68 [IW2001] P54 X 09 56 55.8 +69 09 00           ~ 1 0
69 USNO-A2.0 1575-03028666 X 09 57 01.6 +68 56 49           ~ 1 0
70 [IW2001] P57 X 09 57 10.9 +69 05 01           ~ 1 0
71 GSC 04383-00612 X 09 57 14.4 +69 11 35           ~ 1 0
72 [IW2001] P59 X 09 57 17.2 +69 10 12           ~ 1 0
73 [IW2001] P60 X 09 57 17.5 +68 58 27           ~ 1 0
74 [IW2001] P61 X 09 57 26.9 +68 53 16           ~ 1 0
75 [IW2001] P62 X 09 57 28.4 +69 13 30           ~ 1 0
76 MCG+12-10-012 AG? 09 57 32.8632 +69 02 50.735 15.19 15.15 14.10 14.12   ~ 327 4
77 [IW2001] P65 X 09 57 35.7 +69 16 07           ~ 1 0
78 2XMM J095735.6+690007 AGN 09 57 35.7767968560 +69 00 07.067899260           ~ 3 0
79 2MASS J09575151+6903323 * 09 57 51.4499527632 +69 03 32.198272236           ~ 2 0
80 RX J0957.9+6903 ULX 09 57 53.290 +69 03 48.20           ~ 246 4
81 [IW2001] H45 X 09 57 56.44 +69 11 39.2           ~ 1 0
82 [IW2001] P68 X 09 57 57.3 +69 06 11           ~ 1 0
83 [LB2005] NGC 3031 X25 X 09 58 02.94 +68 57 10.1           ~ 2 0
84 NGC 5447 HII 14 02 28.0 +54 16 34           ~ 73 0
85 NGC 5455 H2G 14 03 01.17 +54 14 29.4           ~ 105 0
86 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
87 NGC 5461 HII 14 03 40.96 +54 19 02.4           ~ 195 0
88 NGC 5462 HII 14 03 53.0997760440 +54 22 06.493306404           ~ 85 0
89 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 2172 0
90 [IW2001] P55 X ~ ~           ~ 1 0

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