2003ApJ...586..826K

Query : 2003ApJ...586..826K

2003ApJ...586..826K - Astrophys. J., 586, 826-849 (2003/April-1)

Chandra X-ray observations of NGC 1316 (Fornax A).

KIM D.-W. and FABBIANO G.

Abstract (from CDS):

We report the results of the Chandra ACIS subarcsecond resolution X-ray observation of the archetypal merger radio galaxy NGC 1316 (Fornax A). We confirm the presence of fine substructures in the hot interstellar medium (ISM). Some of these are likely to result from interaction with the radio jets, while others may be related to a complex intermingling of different phases of the ISM. We detect a low-luminosity X-ray active galactic nucleus (AGN) with LX=5x1039 ergs.s–1 (in 0.3-8 keV) and a Γ=1.7 power-law energy spectrum. We also detect 81 point sources within the 25th magnitude isophotal ellipse of NGC 1316 (LXin the range of 2x1037 to 2x1039 ergs.s–1), with hard (kT∼5 keV) X-ray spectra, typical of X-ray binaries, and a spatial radial distribution consistent with that of the optical (i.e., stellar) surface brightness. We derive the X-ray luminosity function (XLF) of these sources, correcting for the incompleteness at the faint end caused by the presence of the diffuse emission from the hot ISM in the central regions of NGC 1316 and by the widening of the Chandra point-spread functions at increasing distance from the aim point. With these corrections, the XLF is well reproduced by a single–unbroken–power law with a slope of -1.3 down to our threshold luminosity of ∼3x1037 ergs.s–1. The hot ISM has temperatures in the 0.5-0.6 keV range, its surface brightness distribution is more centrally concentrated than that of the point sources, and its temperature appears to decrease at larger radii. These properties suggest that the ISM may be subject to partial winds. Taking into account the spectral complexity of the ISM, and the presence of unresolved low luminosity X-ray sources (which can be inferred from the spectra), we constrain the metal abundance of the hot ISM to be Z=0.25-1.3 Z☉(90% confidence).

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Abundances - Galaxies: Individual: NGC Number: NGC 1316 - galaxies: individual (NGC 1317) - Galaxies: ISM - X-Rays: Galaxies

VizieR on-line data: <Available at CDS (J/ApJ/586/826): table1.dat>

Simbad objects: 108

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Number of rows : 108
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 NGC 507 rG 01 23 39.950 +33 15 22.22   13.0       ~ 459 1
3 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
4 CXOU J032137.5-371454 X 03 21 37.5 -37 14 54           ~ 2 0
5 CXOU J032145.8-370430 X 03 21 45.8 -37 04 30           ~ 1 0
6 2XMM J032147.0-370721 AG? 03 21 47.1 -37 07 23           ~ 2 0
7 CXOU J032159.4-370515 X 03 21 59.4 -37 05 15           ~ 1 0
8 CXOU J032200.7-371918 X 03 22 00.7 -37 19 18           ~ 1 0
9 CXOU J032211.1-370954 X 03 22 11.1 -37 09 54           ~ 1 0
10 CXOU J032212.6-371212 X 03 22 12.6 -37 12 12           ~ 1 0
11 CXOU J032215.4-371656 UX? 03 22 15.49 -37 16 59.5           ~ 2 0
12 CXOU J032219.5-371338 X 03 22 19.5 -37 13 38           ~ 1 0
13 CXOU J032219.9-371322 X 03 22 19.9 -37 13 22           ~ 1 0
14 CXOU J032225.6-371145 X 03 22 25.6 -37 11 45           ~ 1 0
15 CXOU J032225.7-370912 X 03 22 25.7 -37 09 12           ~ 3 0
16 CXOU J032227.5-371223 X 03 22 27.5 -37 12 23           ~ 1 0
17 CXOU J032228.9-371242 X 03 22 28.9 -37 12 42           ~ 1 0
18 CXOU J032228.9-371443 X 03 22 28.9 -37 14 43           ~ 1 0
19 CXOU J032229.1-371023 X 03 22 29.1 -37 10 23           ~ 1 0
20 CXOU J032229.5-371511 X 03 22 29.5 -37 15 11           ~ 1 0
21 CXOU J032230.4-371025 X 03 22 30.4 -37 10 25           ~ 1 0
22 CXOU J032230.8-370736 X 03 22 30.8 -37 07 36           ~ 1 0
23 CXOU J032232.6-371309 X 03 22 32.6 -37 13 09           ~ 1 0
24 CXOU J032235.2-371205 X 03 22 35.2 -37 12 05           ~ 1 0
25 CXOU J032235.2-371127 X 03 22 35.2 -37 11 27           ~ 1 0
26 CXOU J032235.3-371248 X 03 22 35.3 -37 12 48           ~ 1 0
27 CXOU J032235.5-371313 X 03 22 35.5 -37 13 13           ~ 1 0
28 CXOU J032235.6-371248 X 03 22 35.6 -37 12 48           ~ 1 0
29 CXOU J032235.7-371218 X 03 22 35.7 -37 12 18           ~ 1 0
30 CXOU J032235.9-371135 X 03 22 35.9 -37 11 35           ~ 1 0
31 CXOU J032235.9-371256 X 03 22 35.9 -37 12 56           ~ 1 0
32 CXOU J032236.4-370842 X 03 22 36.4 -37 08 42           ~ 1 0
33 CXOU J032236.4-371324 X 03 22 36.4 -37 13 24           ~ 1 0
34 CXOU J032236.6-371054 X 03 22 36.6 -37 10 54           ~ 1 0
35 CXOU J032236.6-371306 X 03 22 36.6 -37 13 06           ~ 1 0
36 CXOU J032237.2-371212 X 03 22 37.2 -37 12 12           ~ 1 0
37 CXOU J032237.4-371301 X 03 22 37.4 -37 13 01           ~ 1 0
38 CXOU J032237.5-371428 X 03 22 37.5 -37 14 28           ~ 1 0
39 CXOU J032237.6-371252 X 03 22 37.6 -37 12 52           ~ 1 0
40 CXOU J032238.7-371422 X 03 22 38.7 -37 14 22           ~ 1 0
41 CXOU J032238.7-371221 X 03 22 38.7 -37 12 21           ~ 1 0
42 CXOU J032239.1-371148 X 03 22 39.1 -37 11 48           ~ 2 0
43 CXOU J032239.3-371313 X 03 22 39.3 -37 13 13           ~ 1 0
44 CXOU J032239.4-371256 X 03 22 39.4 -37 12 56           ~ 1 0
45 CXOU J032239.4-371252 X 03 22 39.4 -37 12 53           ~ 1 0
46 CXOU J032239.6-371243 X 03 22 39.72 -37 12 41.9           ~ 1 0
47 CXOU J032239.9-371056 X 03 22 39.9 -37 10 56           ~ 1 0
48 CXOU J032240.1-371310 X 03 22 40.1 -37 13 10           ~ 1 0
49 CXOU J032240.4-371244 X 03 22 40.4 -37 12 45           ~ 2 0
50 CXOU J032240.5-371227 X 03 22 40.5 -37 12 27           ~ 2 0
51 CXOU J032240.7-371151 X 03 22 40.7 -37 11 51           ~ 1 0
52 CXOU J032240.7-370518 X 03 22 40.7 -37 05 18           ~ 1 0
53 CXOU J032240.8-371224 ULX 03 22 40.8 -37 12 24           ~ 3 0
54 CXOU J032241.1-371235 ULX 03 22 41.07 -37 12 35.3           ~ 4 0
55 CXOU J032241.3-371117 X 03 22 41.3 -37 11 17           ~ 2 0
56 CXOU J032241.7-371343 X 03 22 41.7 -37 13 43           ~ 1 0
57 CXOU J032241.7-371229 X 03 22 41.7 -37 12 29           ~ 1 0
58 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
59 CXOU J032241.8-371225 X 03 22 41.8 -37 12 25           ~ 1 0
60 CXOU J032241.8-371207 X 03 22 41.8 -37 12 07           ~ 1 0
61 CXOU J032241.9-371305 X 03 22 41.9 -37 13 05           ~ 2 0
62 CXOU J032241.9-371238 X 03 22 41.9 -37 12 38           ~ 1 0
63 CXOU J032242.0-371246 X 03 22 42.0 -37 12 46           ~ 1 0
64 CXOU J032242.0-371256 X 03 22 42.0 -37 12 56           ~ 1 0
65 CXOU J032242.0-371218 X 03 22 42.0 -37 12 19           ~ 2 0
66 CXOU J032242.1-371123 X 03 22 42.1 -37 11 23           ~ 2 0
67 CXOU J032242.3-371300 X 03 22 42.3 -37 13 00           ~ 1 0
68 CXOU J032242.5-371258 X 03 22 42.5 -37 12 58           ~ 2 0
69 CXOU J032242.5-371222 ULX 03 22 42.5 -37 12 22           ~ 2 0
70 CXOU J032242.7-371217 X 03 22 42.7 -37 12 17           ~ 2 0
71 CXOU J032242.8-371222 X 03 22 42.8 -37 12 22           ~ 1 0
72 CXOU J032243.2-371206 X 03 22 43.2 -37 12 06           ~ 1 0
73 CXOU J032243.3-371104 X 03 22 43.3 -37 11 04           ~ 1 0
74 CXOU J032243.7-371215 X 03 22 43.7 -37 12 15           ~ 1 0
75 CXOU J032243.8-371233 X 03 22 43.8 -37 12 33           ~ 1 0
76 CXOU J032243.9-371203 X 03 22 43.9 -37 12 03           ~ 1 0
77 CXOU J032244.2-371053 X 03 22 44.2 -37 10 53           ~ 1 0
78 NGC 1317 GiP 03 22 44.2823209512 -37 06 13.180903956 12.20 11.78 11.02 10.22   ~ 240 1
79 CXOU J032244.3-370614 X 03 22 44.41 -37 06 12.6           ~ 2 0
80 CXOU J032244.8-371210 X 03 22 44.8 -37 12 10           ~ 1 0
81 CXOU J032245.2-371423 X 03 22 45.2 -37 14 23           ~ 1 0
82 CXOU J032245.4-371306 X 03 22 45.4 -37 13 06           ~ 1 0
83 CXOU J032245.4-371226 X 03 22 45.4 -37 12 25           ~ 1 0
84 CXOU J032245.6-371207 X 03 22 45.6 -37 12 07           ~ 1 0
85 CXOU J032245.8-371214 X 03 22 45.8 -37 12 14           ~ 1 0
86 CXOU J032246.1-370552 X 03 22 46.1 -37 05 52           ~ 1 0
87 CXOU J032247.1-371408 X 03 22 47.1 -37 14 08           ~ 1 0
88 CXOU J032247.5-371240 X 03 22 47.5 -37 12 40           ~ 1 0
89 CXOU J032248.3-371159 X 03 22 48.3 -37 11 59           ~ 1 0
90 CXOU J032249.3-371152 X 03 22 49.3 -37 11 52           ~ 1 0
91 CXOU J032249.4-371033 X 03 22 49.4 -37 10 33           ~ 1 0
92 CXOU J032250.9-370813 X 03 22 50.9 -37 08 13           ~ 1 0
93 CXOU J032251.0-371206 X 03 22 51.0 -37 12 06           ~ 1 0
94 CXOU J032251.2-370949 UX? 03 22 51.22 -37 09 49.5           ~ 8 1
95 CXOU J032252.2-371158 X 03 22 52.2 -37 11 58           ~ 1 0
96 CXOU J032253.6-371211 X 03 22 53.6 -37 12 11           ~ 1 0
97 CXOU J032254.3-371027 X 03 22 54.3 -37 10 27           ~ 1 0
98 CXOU J032254.7-370706 X 03 22 54.7 -37 07 07           ~ 1 0
99 CXOU J032259.7-371128 X 03 22 59.7 -37 11 28           ~ 1 0
100 [SGT2004] J032305.74-371112.4 X 03 23 05.74 -37 11 12.4           ~ 2 0
101 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1987 2
102 ACO 780 ClG 09 18 30 -12 15.7           ~ 469 0
103 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1841 2
104 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 895 0
105 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
106 BAX 299.8681+40.7339 ClG 19 59 30.3 +40 44 11           ~ 143 0
107 IC 1459 rG 22 57 10.60682195 -36 27 43.9966421   10.96 11.85 9.34 10.3 ~ 652 2
108 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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