1998ApJ...508L..33S

Query : 1998ApJ...508L..33S

1998ApJ...508L..33S - Astrophys. J., 508, L33-L36 (1998/November-3)

Discovery of a nuclear X-ray source in NGC 7331: evidence for a massive black hole.

STOCKDALE C.J., ROMANISHIN W. and COWAN J.J.

Abstract (from CDS):

Using ROSAT, we have made the first deep X-ray observations of NGC 7331, discovering a nuclear X-ray source coincident with the previously determined radio and optical nuclear centers. The positions, luminosities, and fluxes of X-ray sources in the field are compared with previously identified radio and optical sources. The nucleus of NGC 7331 has been analyzed to discern any new evidence supporting the presence of a massive black hole, and comparisons are made with other low-ionization nuclear emission-line region (LINER) galaxies. The flux ratio of core radio to soft X-ray emission in NGC 7331 is lower than in other LINERs included in our sample.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Individual: NGC Number: NGC 7331 - Galaxies: Individual: NGC Number: NGC 7335 - Galaxies: Nuclei - X-Rays: Galaxies

Nomenclature: Table 1: [SRC98] NN (Nos 1-10).

Simbad objects: 22

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Number of rows : 22
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
3 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
4 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1476 3
5 NGC 3147 Sy2 10 16 53.6388580752 +73 24 02.641798224   11.43 10.61     ~ 533 2
6 NGC 3628 LIN 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 853 3
7 NGC 3642 LIN 11 22 17.9010437568 +59 04 28.275641436   14.86 14.04     ~ 220 0
8 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
9 M 58 Sy2 12 37 43.59747 +11 49 05.1240 10.80 10.48 9.66     ~ 1140 2
10 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1465 2
11 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1476 2
12 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
13 [SRC98] 9 X 22 35 54.60 +34 13 51.3           ~ 1 0
14 1AXG J223603+3412 X 22 36 03.43 +34 12 15.0           ~ 2 0
15 [SRC98] 3 X 22 36 29.38 +34 25 56.8           ~ 1 0
16 [SRC98] 4 X 22 36 33.13 +34 30 11.5           ~ 1 0
17 [SRC98] 7 X 22 37 03.48 +34 09 47.9           ~ 1 0
18 NGC 7331 LIN 22 37 04.0506038088 +34 24 56.800076508 10.65 10.35 9.48     ~ 1284 2
19 NGC 7335 GiG 22 37 19.4112839184 +34 26 52.260650124 14.76 14.44 13.35     ~ 37 1
20 [SRC98] 5 X 22 37 28.97 +34 25 25.5           ~ 1 0
21 [SRC98] 6 * 22 37 38.1016107624 +34 22 27.058951272           ~ 2 0
22 [SRC98] 8 X 22 37 51.93 +34 28 29.4           ~ 1 0

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