2005AJ....129.1350S


Query : 2005AJ....129.1350S

2005AJ....129.1350S - Astron. J., 129, 1350-1368 (2005/March-0)

Chandra X-ray imaging of the interacting starburst galaxy system NGC 7714/7715: tidal ultraluminous X-ray sources, emergent wind, and resolved H II regions.

SMITH B.J., STRUCK C. and NOWAK M.A.

Abstract (from CDS):

We present high spatial resolution X-ray imaging data for the interacting galaxy pair NGC 7714/7715 (Arp 284) from the Chandra X-ray telescope. In addition to the unresolved starburst nucleus, a variable point source with LX~1040 ergs/s was detected 1".5 (270 pc) to the northwest of the nucleus, coincident with a blue, extremely optically luminous (MV~-14.1) point source on Hubble Space Telescope images. Eleven other candidate pointlike ultraluminous X-ray sources (ULXs) were also detected in the vicinity of NGC 7714/7715, two of which exceed 1040 ergs/s. Ten of these appear to be associated with interaction-induced features, but only two are associated with star formation regions. We also found diffuse emission with LX~3x1040 ergs/s extending 11" (1.9 kpc) to the north of the nucleus. Its spectrum can be fitted with either a two-temperature MEKAL function (kT=0.59+0.05–0.06 and 8+10–3keV) or a 0.6 keV MEKAL function plus a power law (Γ=1.8±0.2). The hard component may be due to high-mass X-ray binaries (HMXBs) with possible contributions from inverse Compton radiation, while the soft component is likely from a superwind. Superbubble models imply an expansion age of ~15 Myr, supporting previous assertions of an intermediate-age nuclear stellar population in addition to a 5 Myr starburst. We also detected extended X-ray emission associated with four extranuclear H II region complexes. The emission from these H II regions and the nuclear starburst could be due to either an enhanced population of HMXBs relative to Local Group galactic averages or to diffuse gas heated by winds from supernovae, if the X-ray production efficiency LX/Lmechis high (~5%). To estimate LX/Lmech, we collected published data for well-studied H II regions and superbubbles in nearby galaxies. For H II regions with ages less than 3.5 Myr, the median LX/Lmech~0.02%, while for older star formation regions, LX/Lmech~0.2%-7%. Thus, it is possible that gas heating by supernovae may be sufficient to account for the observed X-rays from these H II regions. In galaxies much more distant than NGC 7714, for example, the Cartwheel galaxy, H II region complexes similar to those in NGC 7714 will be unresolved by Chandra and will mimic ULXs. No X-ray emission was detected from the Type Ib supernova SN 1999dn, with an upper limit of ~2x1038 ergs/s.

Abstract Copyright:

Journal keyword(s): Galaxies: Individual: NGC Number: NGC 7714 - Galaxies: Individual: NGC Number: NGC 7715 - Galaxies: Interactions - Galaxies: Starburst

Nomenclature: Fig.8, Table 1: [SSN2005] NN (Nos 1-13). Fig.5, Table 3: [SSN2005] A (Nos A-E).

Simbad objects: 67

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Number of rows : 67
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 NAME Cartwheel G 00 37 41.1133192392 -33 42 58.515101748   19.26   18.52   ~ 264 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10320 1
3 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 462 0
4 NGC 1637 AGN 04 41 28.1926876152 -02 51 28.667815488   11.4   11.0 11.3 ~ 395 0
5 LHA 120-N 185 EmO 04 53 58.9 -70 00 53           ~ 37 0
6 LHA 120-N 11 HII 04 56 51.4 -66 24 24           ~ 247 0
7 LHA 120-N 186 EmO 04 59 45.5 -70 09 45           ~ 36 0
8 NGC 1800 G 05 06 25.737 -31 57 15.21 13.51 13.19 12.70 12.48 12.9 ~ 169 1
9 LHA 120-N 44 EmO 05 22 06.9 -67 56 46           ~ 184 1
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16164 1
11 M 42 HII 05 35 17.3 -05 23 28           ~ 3919 0
12 NAME Ori A MoC 05 38 -07.1           ~ 2861 0
13 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1114 2
14 LHA 120-N 70 HII 05 43 17.5 -67 50 48           ~ 80 0
15 NGC 2244 OpC 06 32 11 +04 54.8           ~ 590 1
16 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4201 3
17 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5619 6
18 GUM 29 HII 10 24 14.6 -57 46 58           ~ 199 0
19 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 805 2
20 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 953 2
21 NGC 3603 OpC 11 15 11 -61 15.5           ~ 1017 1
22 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1304 1
23 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1631 0
24 NGC 4039 GiP 12 01 53.8 -18 53 06   11.08   9.77   ~ 1148 1
25 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 915 1
26 SDSS J122153.96+042742.5 HII 12 21 53.969 +04 27 42.59           ~ 5 0
27 M 61 Sy2 12 21 54.9282582888 +04 28 25.597367184 10.07 10.18 9.65     ~ 940 2
28 [JSM2003] j HII 12 21 56.3 +04 29 28           ~ 4 0
29 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1076 1
30 NGC 4565 LIN 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 919 0
31 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1033 2
32 IC 819 AGN 12 46 10.060 +30 43 54.64           ~ 264 1
33 NGC 4676 IG 12 46 10.18 +30 43 53.7   14.1       ~ 305 0
34 NGC 5204 LSB 13 29 36.508 +58 25 07.43   11.84   11.37   ~ 445 0
35 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2411 2
36 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1316 4
37 NGC 5455 H2G 14 03 01.17 +54 14 29.4           ~ 97 0
38 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2728 2
39 NGC 5461 HII 14 03 40.96 +54 19 02.4           ~ 179 0
40 NGC 5462 HII 14 03 53.0997760440 +54 22 06.493306404           ~ 78 0
41 M 8 HII 18 03 37 -24 23.2           ~ 585 1
42 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1554 0
43 W 51 SNR 19 23 50 +14 06.0           ~ 1219 1
44 NGC 7112 GiP 21 42 22.8445729008 +12 29 53.895361632   15.19       ~ 60 1
45 CXOU J233609.1+021007 X 23 36 09.1 +02 10 07           ~ 1 0
46 CXOU J233610.0+020900 X 23 36 10.0 +02 09 00           ~ 3 0
47 CXOU J233610.1+020923 X 23 36 10.1 +02 09 23           ~ 2 0
48 CXOU J233611.5+020853 X 23 36 11.5 +02 08 53           ~ 2 0
49 CXOU J233612.3+020905 X 23 36 12.3 +02 09 05           ~ 2 0
50 CXOU J233613.2+020902 X 23 36 13.2 +02 09 02           ~ 2 0
51 CXOU J233613.9+020936 X 23 36 13.9 +02 09 36           ~ 2 0
52 NGC 7714 GiP 23 36 14.1257730600 +02 09 18.197422668   14.91 14.36     ~ 750 1
53 CXOU J233614.2+020908 X 23 36 14.2 +02 09 08           ~ 2 0
54 SN 1999dn SN* 23 36 14.70 +02 09 08.8     16.0     SNIb 103 1
55 CXOU J233615.1+020904 X 23 36 15.1 +02 09 04           ~ 2 0
56 CXOU J233615.6+020923 X 23 36 15.6 +02 09 23           ~ 2 0
57 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 605 0
58 CXOU J233619.3+020839 X 23 36 19.3 +02 08 39           ~ 1 0
59 NGC 7715 GiP 23 36 21.768 +02 09 25.30   11.81 12.14     ~ 135 0
60 CXOU J233622.1+020923 X 23 36 22.1 +02 09 23           ~ 1 0
61 CXOU J233623.5+020933 X 23 36 23.5 +02 09 33           ~ 1 0
62 [SSN2005] D HII ~ ~           ~ 2 0
63 [SSN2005] C HII ~ ~           ~ 2 0
64 [SSN2005] A HII ~ ~           ~ 2 0
65 [SSN2005] B HII ~ ~           ~ 2 0
66 NAME Local Group GrG ~ ~           ~ 7726 0
67 [SSN2005] E HII ~ ~           ~ 2 0

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2022.08.17-09:35:26

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