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Query : 1998ApJ...499..650I |
1998ApJ...499..650I - Astrophys. J., 499, 650-669 (1998/June-1)
ROSAT X-ray colors and emission mechanisms in early-type galaxies.
IRWIN J.A. and SARAZIN C.L.
Abstract (from CDS):
Galaxies with the lowest LX/LB values appear to be lacking a hot interstellar component. Their X-ray colors are consistent with those derived from the bulges of the spiral galaxies M31 and NGC 1291. In M31, the X-ray emission is resolved into discrete sources and is apparently due primarily to low-mass X-ray binaries (LMXBs). We therefore suggest that the bulk of the X-ray emission in the faintest elliptical galaxies is also due to LMXBs. Previously, the X-ray spectra of X-ray-faint galaxies had been found to be described by a hard component, which was attributed to LMXB emission, and a very soft component of unknown origin. We show that the very soft component also likely results from LMXBs, as a very soft component is seen in the X-ray spectra of the nearby LMXB Her X-1 and LMXBs in the bulge of M31. If the X-ray emission in X-ray-faint galaxies is primarily from stellar sources, then a range in LX/LB among these galaxies suggests that the stellar X-ray luminosity does not scale with optical luminosity, at least for galaxies of low optical luminosities. This could be the result of a decrease in the proportion of LMXBs with decreasing optical luminosity and/or the effects of fluctuations in the small number of LMXBs expected.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Abundances - Galaxies: Elliptical and Lenticular, cD - Galaxies: Halos - Galaxies: ISM - X-Rays: Galaxies - X-Rays: ISM
Simbad objects: 71
Number of rows : 71 |
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 | M 110 | GiG | 00 40 22.0572349992 | +41 41 07.507220136 | 8.92 | 8.07 | ~ | 1308 | 1 | |||
2 | M 32 | GiG | 00 42 41.82480 | +40 51 54.6120 | 9.51 | 9.03 | 8.08 | ~ | 2154 | 2 | ||
3 | M 31 | AGN | 00 42 44.330 | +41 16 07.50 | 4.86 | 4.36 | 3.44 | ~ | 12645 | 1 | ||
4 | NGC 507 | BiC | 01 23 39.950 | +33 15 22.22 | 13.0 | ~ | 440 | 3 | ||||
5 | NGC 524 | GiP | 01 24 47.7429545736 | +09 32 20.089023900 | 11.5 | ~ | 462 | 1 | ||||
6 | NGC 533 | GiG | 01 25 31.4074984248 | +01 45 33.236656812 | 13.1 | 14.11 | ~ | 227 | 0 | |||
7 | NGC 596 | GiG | 01 32 51.9046959816 | -07 01 53.646821220 | 11.5 | ~ | 240 | 0 | ||||
8 | 2E 0150.5-1358 | ClG | 01 53 00.40 | -13 44 18.0 | ~ | 387 | 0 | |||||
9 | NGC 720 | Sy1 | 01 53 00.523 | -13 44 19.25 | 12.4 | 10.36 | ~ | 522 | 0 | |||
10 | NAME Magellanic Clouds | GrG | 03 00 | -71.0 | ~ | 7064 | 0 | |||||
11 | NGC 1199 | GiP | 03 03 38.4220343160 | -15 36 48.461862600 | 13.99 | 12.97 | 12.31 | 11.59 | ~ | 184 | 1 | |
12 | NGC 1269 | EmG | 03 17 18.5785534752 | -41 06 28.628735184 | 9.85 | 9.83 | 8.81 | 8.72 | ~ | 422 | 1 | |
13 | NGC 1316 | BL? | 03 22 41.789 | -37 12 29.52 | 9.81 | 9.15 | 8.53 | 7.66 | ~ | 1387 | 1 | |
14 | NGC 1332 | GiP | 03 26 17.321 | -21 20 07.33 | 11.45 | 9.84 | ~ | 350 | 0 | |||
15 | NGC 1340 | GiG | 03 28 19.6251763296 | -31 04 05.435465520 | 11.20 | 10.32 | 9.70 | ~ | 214 | 1 | ||
16 | NGC 1380 | Sy2 | 03 36 27.590 | -34 58 34.68 | 11.32 | 10.94 | 9.93 | 9.37 | ~ | 429 | 1 | |
17 | NGC 1381 | GiP | 03 36 31.6592184144 | -35 17 42.739221912 | 12.90 | 12.47 | 11.50 | 11.02 | ~ | 254 | 1 | |
18 | NGC 1387 | Sy2 | 03 36 57.0337458600 | -35 30 23.675934060 | 12.18 | 11.75 | 10.69 | 10.16 | ~ | 262 | 1 | |
19 | NGC 1399 | BiC | 03 38 29.083 | -35 27 02.67 | 11.05 | 9.74 | 9.59 | 8.12 | ~ | 1570 | 1 | |
20 | NGC 1395 | SyG | 03 38 29.789 | -23 01 39.69 | 10.71 | 8.99 | ~ | 279 | 0 | |||
21 | NGC 1404 | GiP | 03 38 51.917 | -35 35 39.81 | 11.53 | 10.69 | 10.00 | 9.03 | ~ | 751 | 1 | |
22 | NGC 1400 | EmG | 03 39 30.851 | -18 41 17.25 | 12.48 | 12.01 | 10.96 | 10.45 | ~ | 299 | 1 | |
23 | NGC 1407 | GiG | 03 40 11.904 | -18 34 49.36 | 10.64 | 9.67 | 9.13 | ~ | 585 | 1 | ||
24 | NGC 1427 | GiG | 03 42 19.4455150392 | -35 23 33.169251120 | 11.89 | 10.44 | ~ | 281 | 0 | |||
25 | NGC 1549 | GiP | 04 15 45.223 | -55 35 32.50 | 11.22 | 10.48 | 9.79 | 9.08 | ~ | 240 | 1 | |
26 | NGC 1553 | GiP | 04 16 10.4697802536 | -55 46 48.072797400 | 10.76 | 10.10 | 9.40 | 8.74 | ~ | 377 | 2 | |
27 | NGC 2300 | AG? | 07 32 20.486 | +85 42 31.90 | 12.2 | ~ | 335 | 0 | ||||
28 | NGC 3091 | BiC | 10 00 14.125 | -19 38 11.32 | 12.04 | 10.61 | 10.56 | 9.25 | ~ | 184 | 0 | |
29 | NGC 3115 | GiG | 10 05 13.9270507008 | -07 43 06.982712292 | 11 | 9.37 | ~ | 1013 | 2 | |||
30 | NGC 3193 | GiP | 10 18 24.884 | +21 53 38.32 | 12.29 | 11.83 | 10.88 | 12.19 | ~ | 289 | 1 | |
31 | NGC 3585 | GiG | 11 13 17.109 | -26 45 17.96 | 10.64 | 9.22 | ~ | 289 | 0 | |||
32 | [VV2006] J111654.8+180304 | QSO | 11 16 54.7 | +18 03 06 | 13.84 | 12.76 | ~ | 467 | 0 | |||
33 | NGC 3608 | LIN | 11 16 58.967 | +18 08 54.71 | 11.7 | ~ | 508 | 0 | ||||
34 | NGC 3610 | GiG | 11 18 25.2827189856 | +58 47 10.433735988 | 11.4 | ~ | 311 | 0 | ||||
35 | NGC 3640 | GiG | 11 21 06.852 | +03 14 05.15 | 11.89 | 11.36 | 10.44 | ~ | 275 | 3 | ||
36 | NGC 3665 | rG | 11 24 43.630 | +38 45 46.05 | 13.71 | 13.26 | 11.62 | ~ | 344 | 1 | ||
37 | NGC 4125 | GiP | 12 08 06.017 | +65 10 26.88 | 11.14 | 10.65 | 9.72 | ~ | 427 | 2 | ||
38 | NGC 4261 | LIN | 12 19 23.2160630 | +05 49 29.700024 | 13.92 | 12.87 | ~ | 1223 | 0 | |||
39 | NGC 4291 | GiG | 12 20 17.699 | +75 22 15.47 | 17.0 | ~ | 304 | 1 | ||||
40 | NGC 4365 | GiG | 12 24 28.228 | +07 19 03.07 | 11.5 | ~ | 841 | 0 | ||||
41 | NGC 4371 | GiG | 12 24 55.4333579760 | +11 42 15.144247584 | 12.35 | 11.79 | 10.81 | ~ | 318 | 1 | ||
42 | M 84 | Sy2 | 12 25 03.74333 | +12 53 13.1393 | 12.67 | 12.09 | 10.49 | ~ | 1762 | 2 | ||
43 | M 85 | GiP | 12 25 24.053 | +18 11 27.89 | 10.2 | ~ | 644 | 0 | ||||
44 | M 86 | GiG | 12 26 11.814 | +12 56 45.49 | 10.32 | 9.83 | 8.90 | 7.50 | ~ | 1084 | 1 | |
45 | M 49 | Sy2 | 12 29 46.8 | +08 00 01 | 13.21 | 12.17 | ~ | 2093 | 2 | |||
46 | NGC 4474 | GiG | 12 29 53.5396737408 | +14 04 06.881708604 | 12.6 | ~ | 262 | 0 | ||||
47 | NGC 4477 | Sy2 | 12 30 02.1955766304 | +13 38 11.543715888 | 11.98 | 11.38 | 10.42 | ~ | 396 | 2 | ||
48 | M 87 | AGN | 12 30 49.42338414 | +12 23 28.0436859 | 10.16 | 9.59 | 8.63 | 7.49 | ~ | 7192 | 3 | |
49 | IRAS 12315+0758 | GiG | 12 34 03.029 | +07 41 56.90 | 10.6 | ~ | 670 | 0 | ||||
50 | NGC 4550 | GiP | 12 35 30.5913588048 | +12 13 14.921166792 | 12.97 | 12.56 | 11.68 | ~ | 537 | 1 | ||
51 | M 89 | LIN | 12 35 39.80733343 | +12 33 22.8308657 | 11.29 | 10.73 | 9.75 | ~ | 995 | 2 | ||
52 | NGC 4638 | GiP | 12 42 47.4239240016 | +11 26 32.970950556 | 12.2 | 11.23 | ~ | 281 | 1 | |||
53 | NAME NGC 4636 Group | GrG | 12 42 49.5 | +02 41 08 | ~ | 562 | 0 | |||||
54 | NGC 4636 | LIN | 12 42 49.8333280080 | +02 41 15.951929028 | 12.62 | 11.84 | ~ | 1117 | 1 | |||
55 | M 60 | GiP | 12 43 39.9680 | +11 33 09.696 | 10.3 | ~ | 1348 | 1 | ||||
56 | NGC 4697 | GiG | 12 48 35.8981498824 | -05 48 02.482374564 | 10.97 | 9.83 | ~ | 859 | 0 | |||
57 | NGC 4696 | BiC | 12 48 49.2724775784 | -41 18 39.304053252 | 11.21 | 10.7 | ~ | 490 | 3 | |||
58 | NGC 4880 | GiG | 13 00 10.5729961968 | +12 28 59.886650244 | 13.3 | ~ | 86 | 0 | ||||
59 | NGC 5044 | BiC | 13 15 23.9607836592 | -16 23 07.547751744 | 11.9 | 10.74 | ~ | 501 | 0 | |||
60 | NGC 5102 | EmG | 13 21 57.6100832352 | -36 37 48.395156160 | 9.74 | 9.65 | 8.47 | 10.2 | ~ | 367 | 1 | |
61 | IC 4296 | AGN | 13 36 39.03253319 | -33 57 57.0730368 | 11.52 | 12.99 | 10.00 | 10.79 | ~ | 494 | 2 | |
62 | IC 4329 | BiC | 13 49 05.314 | -30 17 45.20 | 11.96 | 11.54 | 10.31 | ~ | 190 | 2 | ||
63 | NGC 5322 | SyG | 13 49 15.24 | +60 11 25.8 | 11.3 | ~ | 415 | 2 | ||||
64 | NGC 5353 | GiP | 13 53 26.6998 | +40 16 58.872 | 11.8 | 10.57 | ~ | 288 | 1 | |||
65 | NGC 5846 | BiC | 15 06 29.253 | +01 36 20.29 | 11.9 | 9.74 | ~ | 849 | 1 | |||
66 | M 102 | SyG | 15 06 29.561 | +55 45 47.91 | 11.12 | 10.74 | 9.89 | ~ | 552 | 3 | ||
67 | V* HZ Her | LXB | 16 57 49.8110126616 | +35 20 32.486555472 | 11.90 | 14.89 | 13.63 | 13.88 | B3/6ep | 2076 | 0 | |
68 | ESO 185-54 | BiC | 20 03 27.0429278400 | -55 56 49.742007324 | 12.11 | 10.57 | ~ | 60 | 0 | |||
69 | NGC 7144 | GiG | 21 52 42.4890937656 | -48 15 13.729791132 | 11.87 | 10.71 | 10.39 | ~ | 152 | 1 | ||
70 | NGC 7619 | GiG | 23 20 14.524 | +08 12 22.63 | 12.7 | ~ | 449 | 0 | ||||
71 | NGC 7626 | rG | 23 20 42.524 | +08 13 01.43 | 12.8 | ~ | 426 | 1 |
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