2011AJ....142...20P

Query : 2011AJ....142...20P

2011AJ....142...20P - Astron. J., 142, 20 (2011/July-0)

A Chandra observation of the nearby Sculptor group sd galaxy NGC 7793.

PANNUTI T.G., SCHLEGEL E.M., FILIPOVIC M.D., PAYNE J.L., PETRE R., HARRUS I.M., STAGGS W.D. and LACEY C.K.

Abstract (from CDS):

We conducted a Chandra ACIS observation of the nearby Sculptor Group Sd galaxy NGC 7793 as part of a multiwavelength study of supernova remnants (SNRs) in nearby galaxies. At the assumed distance to NGC 7793 of 3.91 Mpc, the limiting unabsorbed luminosity of the detected discrete X-ray sources is LX(0.2-10.0 keV) ~3x1036 erg/s. A total of 22 discrete sources were detected at the ∼3σ level or greater including one ultraluminous X-ray source (ULX). Based on multiwavelength comparisons, we identify X-ray sources coincident with one SNR, the candidate microquasar N7793-S26, one H II region, and two foreground Galactic stars. We also find that the X-ray counterpart to the candidate radio SNR R3 is time variable in its X-ray emission: we therefore rule out the possibility that this source is a single SNR. A marked asymmetry is seen in the distribution of the discrete sources with the majority lying in the eastern half of this galaxy. All of the sources were analyzed using quantiles to estimate spectral properties and spectra of the four brightest sources (including the ULX) were extracted and analyzed. We searched for time variability in the X-ray emission of the detected discrete sources using our measured fluxes along with fluxes measured from prior Einstein and Röntgensatellit observations. From this study, three discrete X-ray sources are established to be significantly variable. A spectral analysis of the galaxy's diffuse emission is characterized by a temperature of kT = 0.19-0.25 keV. The luminosity function of the discrete sources shows a slope with an absolute value of Γ = -0.65±0.11 if we exclude the ULX. If the ULX is included, the luminosity function has a long tail to high LX with a poor-fitting slope of Γ = -0.62±0.2. The ULX-less slope is comparable to the slopes measured for the distributions of NGC 6946 and NGC 2403 but much shallower than the slopes measured for the distributions of IC 5332 and M83. Lastly, we comment on the multiwavelength properties of the SNR population of NGC 7793.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual: NGC 7793 - galaxies: spiral - ISM: supernova remnants - X-rays: binaries - X-rays: galaxies

Simbad objects: 55

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Number of rows : 55
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 ESO 349-31 AG? 00 08 13.1536 -34 34 47.836   15.54   14.99   ~ 156 3
2 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
3 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
4 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 526 0
5 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
6 NGC 1637 Sy2 04 41 28.1926876152 -02 51 28.667815488   11.4   11.0 11.3 ~ 444 0
7 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
8 HK Ho II 18 HII 08 18 55.0 +70 42 54           ~ 8 0
9 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
10 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 777 0
11 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
12 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
13 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
14 SS 433 HXB 19 11 49.5647697480 +04 58 57.827127648   16.854 14.643     A7Ib 2253 4
15 SNR G039.7-02.0 SNR 19 12 20 +04 55.0           ~ 378 1
16 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2661 2
17 IC 5332 GiG 23 34 27.488 -36 06 03.89 11.59 11.27 10.72 10.50 11.2 ~ 216 0
18 MCG-05-56-001 G 23 43 45.549 -31 57 24.37 14.55 14.03 13.73 13.63   ~ 162 1
19 CXOU J234750.8-323726 X 23 47 50.8 -32 37 26           ~ 1 0
20 [PDL2002] NGC 7793 R1 SNR 23 57 40.2 -32 37 38           ~ 3 0
21 CXOU J235743.8-323633 HXB 23 57 43.80 -32 36 33.6           ~ 3 0
22 CXO J235746.7-323607 HXB 23 57 46.70 -32 36 07.4           ~ 3 0
23 [PDL2002] NGC 7793 R3 SR? 23 57 46.8 -32 36 07           ~ 2 0
24 [RP99] P10 X 23 57 47.1 -32 36 05           ~ 3 0
25 CXOU J235747.2-323523 X 23 57 47.20 -32 35 23.8           ~ 3 0
26 [BL97] N7793-S11 HXB 23 57 48.110 -32 36 56.16           ~ 10 0
27 [PDL2002] NGC 7793 R4 SNR 23 57 48.4 -32 36 15           ~ 3 0
28 [RP99] P6 * 23 57 48.5 -32 32 30   16.1       ~ 3 0
29 USNO-B1.0 0574-01250312 HXB 23 57 48.6941603112 -32 32 33.743902020   16.8   15.4   ~ 3 0
30 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1188 2
31 CXOU J235750.9-323728 X 23 57 50.90 -32 37 28.5           ~ 2 0
32 NAME NGC 7793 P13 ULX 23 57 50.90 -32 37 26.6           ~ 225 0
33 2MASS J23575272-3233100 HXB 23 57 52.7679474360 -32 33 09.809798940   17.9       ~ 5 0
34 CXOU J235756.2-323136 X 23 57 56.20 -32 31 36.5           ~ 1 0
35 CXOU J235756.3-323444 HXB 23 57 56.30 -32 34 44.9           ~ 3 0
36 CXO J235756.5-323559 HXB 23 57 56.40 -32 35 59.8           ~ 3 0
37 [BL97] N7793-S24 SR? 23 57 58.950 -32 36 06.75           ~ 9 0
38 CXOU J235759.8-323240 X 23 57 59.80 -32 32 40.9           ~ 2 0
39 CXO J235800.2-323325 HXB 23 58 00.10 -32 33 25.4           ~ 3 0
40 [BL97] N7793-S26 SNR 23 58 00.27 -32 33 22.1           ~ 64 0
41 CXOU J235800.3-323455 HXB 23 58 00.30 -32 34 55.0           ~ 3 0
42 [PDL2002] NGC 7793 R5 SNR 23 58 00.7 -32 35 06           ~ 3 0
43 CXOU J235800.7-323239 X 23 58 00.70 -32 32 39.5           ~ 1 0
44 CXO J235802.8-323614 QSO 23 58 02.8902579384 -32 36 14.244348960   20.99 20.79     ~ 4 0
45 [RP99] P11 X 23 58 03.1 -32 36 34           ~ 3 0
46 CXOU J235803.5-323643 HXB 23 58 03.50 -32 36 43.8           ~ 3 0
47 CXOU J235805.5-323250 X 23 58 05.50 -32 32 50.8           ~ 1 0
48 CXOU J235806.6-323757 X 23 58 06.60 -32 37 57.1           ~ 2 0
49 CXOU J235807.8-323614 HXB 23 58 07.80 -32 36 14.4           ~ 3 0
50 [RP99] P9 X 23 58 08.70 -32 34 03.7   21.2       ~ 13 0
51 CXOU J235809.6-323617 HXB 23 58 09.60 -32 36 17.0           ~ 3 0
52 CXOU J235810.4-323357 X 23 58 10.40 -32 33 57.6           ~ 3 0
53 [DD80] 40 HII ~ ~           ~ 2 0
54 [DD80] 22 HII ~ ~           ~ 2 0
55 NAME Local Group GrG ~ ~           ~ 9325 0

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