2004ApJ...617..262S


Query : 2004ApJ...617..262S

2004ApJ...617..262S - Astrophys. J., 617, 262-280 (2004/December-2)

Chandra observations of diffuse gas and luminous X-ray sources around the x-ray-bright elliptical galaxy NGC 1600.

SIVAKOFF G.R., SARAZIN C.L. and CARLIN J.L.

Abstract (from CDS):

We observed the X-ray-bright E3 galaxy NGC 1600 and nearby members of the NGC 1600 group with the Chandra X-Ray Observatory ACIS-S3 to study their X-ray properties. Unresolved emission dominates the observation; however, we resolved some of the emission into 71 sources, most of which are low-mass X-ray binaries associated with NGC 1600. Twenty-one of the sources have LX>2x1039 ergs/s (0.3-10.0 keV; assuming they are at the distance of NGC 1600), marking them as ultraluminous X-ray point source (ULX) candidates; we expect that only 11±2 are unrelated foreground/background sources. NGC 1600 may have the largest number of ULX candidates in an early-type galaxy to date; however, cosmic variance in the number of background active galactic nuclei cannot be ruled out. The spectrum and luminosity function (LF) of the resolved sources are more consistent with sources found in other early-type galaxies than with sources found in star-forming regions of galaxies. The source LF and the spectrum of the unresolved emission both indicate that there are a large number of unresolved point sources. We propose that these sources are associated with globular clusters (GCs) and that NGC 1600 has a large GC specific frequency. Observations of the GC population in NGC 1600 would be very useful for testing this prediction. Approximately 50%-75% of the unresolved flux comes from diffuse gaseous emission. The spectral fits, hardness ratios, and X-ray surface brightness profile all point to two gas components. We interpret the soft inner component (a≲25'', kT∼0.85 keV) as the interstellar medium of NGC 1600 and the hotter outer component (a≳25'', kT∼1.5 keV) as the intragroup medium of the NGC 1600 group. The X-ray image shows several interesting structures. First, there is a central region of excess emission that is roughly cospatial with Hα and dust filaments immediately west of the center of NGC 1600. There appear to be holes in the X-ray emission to the north and south of the galaxy center that are roughly coincident with the lobes of the NGC 1600 radio source. On larger scales, there is excess emission to the northeast, which we suggest may indicate the center of the group potential. The group galaxy NGC 1603 shows a tail of X-ray emission to its west that is probably due to ram pressure stripping.

Abstract Copyright:

Journal keyword(s): Galaxies: Elliptical and Lenticular, cD - Galaxies: ISM - Galaxies: Intergalactic Medium - X-Rays: Binaries - X-Rays: Galaxies - X-Rays: ISM

VizieR on-line data: <Available at CDS (J/ApJ/617/262): table1.dat>

Nomenclature: Table 1: [SSC2004b] NN (Nos 1-71).

Simbad objects: 82

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Number of rows : 82
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 2E 0150.5-1358 ClG 01 53 00.40 -13 44 18.0           ~ 386 0
2 NGC 720 GiG 01 53 00.523 -13 44 19.25   12.4   10.36   ~ 504 0
3 NGC 1269 GiG 03 17 18.5785534752 -41 06 28.628735184 9.85 9.83 8.81 8.72   ~ 398 1
4 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1515 1
5 NGC 1407 GiG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 556 1
6 NGC 1553 GiP 04 16 10.4697802536 -55 46 48.072797400 10.76 10.10 9.40 8.74   ~ 366 2
7 CXOU J043123.9-050546 X 04 31 23.95 -05 05 46.2           ~ 1 0
8 CXOU J043124.2-050232 X 04 31 24.22 -05 02 32.3           ~ 1 0
9 CXOU J043125.4-050540 X 04 31 25.43 -05 05 40.6           ~ 1 0
10 CXOU J043126.0-050639 X 04 31 26.07 -05 06 39.6           ~ 1 0
11 CXOU J043126.5-050729 X 04 31 26.51 -05 07 29.7           ~ 1 0
12 2XMMi J043127.7-051021 AG? 04 31 27.75 -05 10 21.0           ~ 2 0
13 CXOU J043127.7-050405 X 04 31 27.75 -05 04 05.9           ~ 1 0
14 CXOU J043127.8-050537 X 04 31 27.82 -05 05 37.5           ~ 1 0
15 CXOU J043130.2-050918 X 04 31 30.29 -05 09 18.3           ~ 1 0
16 TYC 4742-254-1 * 04 31 30.4397900376 -05 02 56.327722404   11.61 11.04 10.5   ~ 2 0
17 CXOU J043131.2-050832 X 04 31 31.21 -05 08 32.6           ~ 1 0
18 CXOU J043131.3-050411 X 04 31 31.34 -05 04 11.8           ~ 1 0
19 CXOU J043132.1-050428 X 04 31 32.13 -05 04 28.6           ~ 1 0
20 CXOU J043132.2-050712 X 04 31 32.25 -05 07 12.0           ~ 1 0
21 CXOU J043132.2-050422 X 04 31 32.25 -05 04 22.6           ~ 1 0
22 CXOU J043132.6-050513 X 04 31 32.61 -05 05 13.1           ~ 1 0
23 CXOU J043134.2-050205 X 04 31 34.21 -05 02 05.2           ~ 1 0
24 CXOU J043134.2-050431 X 04 31 34.25 -05 04 31.1           ~ 2 0
25 CXOU J043134.6-050826 X 04 31 34.68 -05 08 26.8           ~ 1 0
26 CXOU J043135.1-050502 X 04 31 35.17 -05 05 02.6           ~ 2 0
27 CXOU J043135.5-050222 X 04 31 35.50 -05 02 22.7           ~ 1 0
28 CXOU J043136.0-050542 X 04 31 36.04 -05 05 42.2           ~ 1 0
29 2MASS J04313613-0503081 NIR 04 31 36.14 -05 03 08.2           ~ 1 0
30 CXOU J043137.3-050536 X 04 31 37.31 -05 05 36.0           ~ 2 0
31 CXOU J043137.3-050457 X 04 31 37.33 -05 04 57.2           ~ 2 0
32 CXOU J043137.8-050818 X 04 31 37.80 -05 08 18.3           ~ 1 0
33 CXOU J043138.1-050456 X 04 31 38.15 -05 04 56.9           ~ 1 0
34 CXOU J043138.2-050245 X 04 31 38.21 -05 02 45.4           ~ 1 0
35 CXOU J043138.3-050536 X 04 31 38.30 -05 05 36.7           ~ 2 0
36 CXOU J043138.6-051011 X 04 31 38.65 -05 10 11.1           ~ 1 0
37 CXOU J043139.5-050711 X 04 31 39.58 -05 07 11.5           ~ 1 0
38 CXOU J043139.7-050456 X 04 31 39.71 -05 04 56.6           ~ 2 0
39 CXOU J043139.7-050436 X 04 31 39.75 -05 04 36.3           ~ 1 0
40 CXOU J043139.8-050407 X 04 31 39.81 -05 04 07.1           ~ 2 0
41 CXOU J043139.8-050552 X 04 31 39.84 -05 05 52.3           ~ 1 0
42 NGC 1600 GiG 04 31 39.858 -05 05 09.97   8.9   10.81   ~ 356 0
43 CXOU J043139.8-050511 X 04 31 39.87 -05 05 10.5           ~ 2 0
44 CXOU J043139.9-050339 X 04 31 39.93 -05 03 39.2           ~ 1 0
45 CXOU J043140.0-050504 X 04 31 40.05 -05 05 04.7           ~ 1 0
46 CXOU J043140.1-050540 X 04 31 40.15 -05 05 40.7           ~ 1 0
47 CXOU J043141.2-050543 X 04 31 41.23 -05 05 43.0           ~ 2 0
48 CXOU J043141.2-050654 X 04 31 41.25 -05 06 54.3           ~ 1 0
49 CXOU J043141.5-050421 X 04 31 41.50 -05 04 21.0           ~ 2 0
50 CXOU J043141.6-050653 X 04 31 41.61 -05 06 53.5           ~ 2 0
51 NGC 1601 GiG 04 31 41.7550507104 -05 03 37.159019244   16       ~ 31 0
52 CXOU J043141.8-050252 X 04 31 41.84 -05 02 52.5           ~ 1 0
53 CXOU J043141.9-050550 X 04 31 41.99 -05 05 50.8           ~ 2 0
54 CXOU J043142.2-050257 X 04 31 42.24 -05 02 57.2           ~ 1 0
55 CXOU J043142.9-050213 X 04 31 42.98 -05 02 13.3           ~ 1 0
56 CXOU J043143.2-050411 X 04 31 43.27 -05 04 11.3           ~ 1 0
57 CXOU J043143.6-050627 X 04 31 43.65 -05 06 27.6           ~ 1 0
58 CXOU J043144.8-050331 X 04 31 44.80 -05 03 31.9           ~ 1 0
59 CXOU J043145.0-050438 X 04 31 45.06 -05 04 38.1           ~ 1 0
60 CXOU J043145.0-050511 * 04 31 45.0931755264 -05 05 11.255705700     19.4     ~ 1 0
61 CXOU J043146.0-050735 X 04 31 46.08 -05 07 35.7           ~ 1 0
62 CXOU J043146.4-050338 X 04 31 46.48 -05 03 38.4           ~ 1 0
63 CXOU J043147.0-050308 X 04 31 47.07 -05 03 08.7           ~ 2 0
64 CXOU J043147.1-050353 X 04 31 47.18 -05 03 53.5           ~ 1 0
65 CXOU J043147.4-050212 X 04 31 47.45 -05 02 12.5           ~ 1 0
66 CXOU J043147.5-050612 X 04 31 47.55 -05 06 12.6           ~ 1 0
67 CXOU J043148.6-050415 X 04 31 48.60 -05 04 15.9           ~ 2 0
68 CXOU J043148.8-050328 X 04 31 48.83 -05 03 28.1           ~ 1 0
69 NGC 1603 GiG 04 31 49.9567979040 -05 05 39.982065972   15.5       ~ 38 0
70 CXOU J043149.8-050539 X 04 31 49.9567979040 -05 05 39.982065972           ~ 2 0
71 CXOU J043150.1-050304 X 04 31 50.16 -05 03 04.7           ~ 1 0
72 CXOU J043150.8-050953 X 04 31 50.83 -05 09 53.3           ~ 1 0
73 CXOU J043150.9-050730 X 04 31 50.96 -05 07 30.7           ~ 1 0
74 CXOU J043153.0-050659 X 04 31 53.06 -05 06 59.0           ~ 2 0
75 CXOU J043153.6-050408 X 04 31 53.68 -05 04 08.6           ~ 2 0
76 CXOU J043153.9-050656 X 04 31 53.90 -05 06 56.8           ~ 1 0
77 CXOU J043155.4-050311 X 04 31 55.43 -05 03 11.5           ~ 1 0
78 CXOU J043155.9-050255 X 04 31 55.98 -05 02 55.1           ~ 1 0
79 CXOU J043157.3-051006 X 04 31 57.39 -05 10 06.5           ~ 1 0
80 NAME NGC 1600 Group ClG 04 32 -05.0           ~ 17 0
81 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1424 0
82 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 835 0

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2022.08.11-19:02:04

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