2010MNRAS.405.2737B

Query : 2010MNRAS.405.2737B

2010MNRAS.405.2737B - Mon. Not. R. Astron. Soc., 405, 2737-2753 (2010/July-2)

A Very Large Telescope imaging and spectroscopic survey of the Wolf-Rayet population in NGC7793.

BIBBY J.L. and CROWTHER P.A.

Abstract (from CDS):

We present a Very Large Telescope/Focal Reducer and Low Dispersion Spectrograph #1 (VLT/FORS1) imaging and spectroscopic survey of the Wolf-Rayet (WR) population in the Sculptor group spiral galaxy NGC7793. We identify 74 emission-line candidates from archival narrow-band imaging, from which 39 were observed with the Multi Object Spectroscopy mode of FORS1. 85 per cent of these sources displayed WR features. Additional slits were used to observe HII regions, enabling an estimate of the metallicity gradient of NGC7793 using strong line calibrations, from which a central oxygen content of log (O/H) + 12 = 8.6 was obtained, falling to 8.25 at R25. We have estimated WR populations using a calibration of line luminosities of Large Magellanic Cloud stars, revealing ∼27 WN and ∼25 WC stars from 29 sources spectroscopically observed. Photometric properties of the remaining candidates suggest an additional ∼27 WN and ∼8 WC stars. A comparison with the WR census of the LMC suggests that our imaging survey has identified ∼80 per cent of WN stars and ∼90 per cent for the WC subclass. Allowing for incompleteness, NGC7793 hosts ∼105 WR stars for which N(WC)/N(WN) ∼ 0.5. From our spectroscopy of HII regions in NGC7793, we revise the global Hα star formation rate of Kennicutt et al. upward by 50 per cent to 0.45 M☉/yr. This allows us to obtain N(WR)/N(O) ∼ 0.018, which is somewhat lower than that resulting from the WR census by Schild et al. of another Sculptor group spiral NGC 300, whose global physical properties are similar to NGC7793. Finally, we also report the fortuitous detection of a bright (mV= 20.8mag) background quasar Q2358-32 at z ∼ 2.02 resulting from Civ λ1548-51 redshifted to the λ4684 passband.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): stars: Wolf-Rayet - ISM: HII regions - galaxies: individual: NGC7793 - galaxies: stellar content - galaxies: ISM

Nomenclature: Table 2: [BC2010] NNa N=99 among (Nos 1-74b). Table 7: [BC2010] GHR NN (Nos 1-15), [BC2010] GHR A (Nos A-D).

Simbad objects: 138

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Number of rows : 138
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 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
2 CD-34 239 PM* 00 41 30.4739854200 -33 37 32.030888686 13.138 11.969 10.525 9.619 8.741 K9V 116 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
5 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 526 0
6 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
7 NGC 1313 AG? 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 723 2
8 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1987 2
9 LP 995-86 Pe* 03 48 22.6125679056 -39 08 37.013680104   13.61 13.15     F 104 0
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
11 HD 269546 WR* 05 26 45.3202797576 -68 49 52.787839260 9.00 9.83 9.86 9.76 9.76 WN5b(h)+B3I 111 0
12 HD 269828 WR* 05 35 58.8736700492 -69 11 47.838658000     13.031   12.837 WN7+O3 84 0
13 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
14 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
15 PG 1323-086 HS* 13 25 39.4669501176 -08 49 19.067387484 12.660 13.341 13.481 13.529 13.608 sdB3IHe8 144 1
16 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
17 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
18 [DD80] 1 HII 23 57 31.543 -32 35 00.29           ~ 1 0
19 [BC2010] 2 * 23 57 33.067 -32 35 45.77   20.81 20.96     ~ 1 0
20 [DD80] 2 HII 23 57 35.837 -32 33 43.87   20.39 20.40     ~ 1 0
21 [BC2010] 4 WR* 23 57 37.240 -32 35 00.03   22.36 22.48     WC4-6 1 0
22 [BC2010] 5b * 23 57 38.858 -32 36 11.06   20.16 20.41     ~ 1 0
23 [BC2010] 5a * 23 57 38.942 -32 36 11.27   19.67 19.53     ~ 1 0
24 [BC2010] 6 HII 23 57 39.0938434680 -32 36 51.094182924   20.54 20.11     ~ 1 0
25 [BC2010] 7a HII 23 57 39.381 -32 35 58.98   19.97 20.25     ~ 1 0
26 [BC2010] 7b HII 23 57 39.450 -32 35 59.03   20.65 20.81     ~ 1 0
27 [BC2010] 8 WR* 23 57 39.5407992624 -32 37 24.665298672   20.76 20.97     WN10 1 0
28 [BC2010] 9 WR* 23 57 40.2639907056 -32 36 35.279164044   20.9 21.12     WN8 1 0
29 [BC2010] 10 WR* 23 57 40.827 -32 35 36.48   20.2 20.17     WN2-4b 3 0
30 [DD80] 14 HII 23 57 41.1 -32 34 50           ~ 4 0
31 [BC2010] 11c HII 23 57 41.105 -32 34 50.26   20.79 20.73     ~ 1 0
32 [BC2010] 12b EmO 23 57 41.158 -32 35 50.17   20.28 20.17     ~ 1 0
33 [BC2010] 12a EmO 23 57 41.165 -32 35 51.11   19.48 19.57     ~ 1 0
34 [BC2010] GHR 1 HII 23 57 41.166 -32 35 50.89           ~ 1 0
35 [BC2010] 11b EmO 23 57 41.197 -32 34 50.34   20.06 20.12     ~ 1 0
36 [BC2010] 11a HII 23 57 41.2410625032 -32 34 51.386223936   19.27 19.20     ~ 1 0
37 [BC2010] 13 EmO 23 57 41.340 -32 35 52.79   19.43 19.32     ~ 1 0
38 [DD80] 15 HII 23 57 41.416 -32 35 34.74           ~ 3 0
39 [BC2010] 14 WR* 23 57 41.417 -32 35 35.97   21.32 21.27     WC4 3 0
40 [BC2010] 15 * 23 57 41.738 -32 37 17.16   22.22 22.28     ~ 1 0
41 [BC2010] 16 WR* 23 57 42.040 -32 37 15.88   21.14 21.35     WN2-4 1 0
42 [BC2010] GHR 5 HII 23 57 43.2 -32 35 49           ~ 1 0
43 [BC2010] 17 * 23 57 43.2757726896 -32 35 49.889556420   19.77 19.84     ~ 1 0
44 [BC2010] 18 * 23 57 43.434 -32 33 38.17   22.04 22.05     ~ 1 0
45 [BC2010] 19b * 23 57 44.072 -32 36 31.77   20.11 20.38     ~ 1 0
46 [BC2010] 19a * 23 57 44.092 -32 36 32.53   19.81 19.82     ~ 1 0
47 [BC2010] 20 WR* 23 57 44.329 -32 35 53.13   22.46 22.50     WC4 1 0
48 [BC2010] 22b HII 23 57 44.413 -32 35 52.01     21.51     ~ 1 0
49 [BC2010] 21b * 23 57 44.416 -32 35 19.87   20.79 20.89     ~ 1 0
50 [BC2010] 21a * 23 57 44.416 -32 35 17.09   19.99 19.64     ~ 1 0
51 [BC2010] 22a HII 23 57 44.4929967336 -32 35 52.227658968   19.99 20.10     ~ 1 0
52 [BC2010] GHR 14 HII 23 57 44.494 -32 35 52.03           ~ 1 0
53 [BC2010] 22c EmO 23 57 44.588 -32 35 51.56     21.43     ~ 1 0
54 [DD80] 27 HII 23 57 44.744 -32 34 24.99           ~ 2 0
55 [BC2010] 23 WR* 23 57 45.610 -32 36 56.14   22.96 23.15     WC4 1 0
56 [BC2010] 24 WR* 23 57 46.647 -32 36 00.28   22.01 21.90     WC4 1 0
57 [BC2010] GHR 6 HII 23 57 46.711 -32 36 06.69           ~ 1 0
58 [BC2010] 25 WR* 23 57 46.805 -32 34 06.49   21.75 21.81     WC4 1 0
59 [BC2010] 26 WR* 23 57 47.049 -32 35 48.11   22.33 22.49     WC4-6 1 0
60 [BC2010] 27 WR* 23 57 47.868 -32 34 06.32   22.31 22.42     WC4 2 0
61 [BC2010] 28 * 23 57 47.933 -32 33 41.44   21.12 21.22     ~ 1 0
62 [BC2010] 29c * 23 57 47.943 -32 34 29.45   20.52 20.43     ~ 1 0
63 [DD80] 47 HII 23 57 48.000 -32 33 04.10           ~ 2 0
64 [BC2010] 29d * 23 57 48.035 -32 34 31.40   20.68 20.63     ~ 1 0
65 [BC2010] 29b * 23 57 48.064 -32 34 29.28   19.39 19.53     ~ 1 0
66 [BC2010] 29a * 23 57 48.184 -32 34 29.49   19.16 19.08     ~ 1 0
67 [DD80] 49 HII 23 57 48.209 -32 36 15.03           ~ 4 0
68 [BC2010] 30b * 23 57 48.376 -32 34 33.60   20.91 21.01     ~ 1 0
69 [DD80] 55 HII 23 57 48.391 -32 34 34.25           ~ 3 0
70 [BC2010] 30a * 23 57 48.479 -32 34 33.48   20.22 20.40     ~ 1 0
71 [BC2010] 31b * 23 57 48.487 -32 37 01.57   19.9 20.31     ~ 1 0
72 [BC2010] 31a * 23 57 48.535 -32 37 02.62   19.44 19.75     ~ 1 0
73 [BC2010] 32b * 23 57 48.560 -32 34 46.00           ~ 1 0
74 [BC2010] 32a * 23 57 48.644 -32 34 46.86   20.94 20.94     ~ 1 0
75 [BC2010] 31c * 23 57 48.665 -32 37 02.84   20.4 20.48     ~ 1 0
76 [BC2010] 33 * 23 57 48.7975059168 -32 34 35.574308112   19.4 19.56     ~ 1 0
77 [BC2010] 34 WR* 23 57 48.816 -32 34 53.27   17.86 18.07     WN5-6:WC4 1 0
78 [BC2010] 35 WR* 23 57 48.855 -32 34 32.86   21.58 21.57     WC5-6 1 0
79 [BC2010] GHR 3 HII 23 57 48.889 -32 34 53.13           ~ 1 0
80 [BC2010] 36 WR* 23 57 48.8956149408 -32 34 56.308093392   20.94 20.88     WC6 1 0
81 [BC2010] 37 WR* 23 57 48.958 -32 36 58.16   21.22 21.22     WC4-6 1 0
82 [BC2010] 38 * 23 57 49.051 -32 33 32.36   22.83 22.90     ~ 1 0
83 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1188 2
84 [DD80] 73 HII 23 57 50.798 -32 34 17.55           ~ 3 0
85 [DD80] 74 HII 23 57 51.194 -32 36 48.75           ~ 3 0
86 [BC2010] 39 WR* 23 57 51.522 -32 35 01.33           WN2-4 1 0
87 [BC2010] 40 * 23 57 52.025 -32 35 21.30   19.65 19.70     ~ 1 0
88 [BC2010] 41 * 23 57 53.045 -32 35 13.44   21.31 21.43     ~ 1 0
89 [BC2010] 42b WR* 23 57 53.540 -32 36 42.24   21.21 20.99     WC4 1 0
90 [BC2010] 42a EmO 23 57 53.621 -32 36 42.98   20.62 20.65     ~ 1 0
91 [BC2010] 43 WR* 23 57 53.975 -32 35 15.25   23.45 23.29     WC4-6 1 0
92 [BC2010] 44 * 23 57 54.090 -32 35 46.91           ~ 1 0
93 [BC2010] 45 WR* 23 57 54.122 -32 35 27.83           WC4-6 1 0
94 [DD80] 95 HII 23 57 54.250 -32 33 59.78           ~ 3 0
95 [BC2010] 46 WR* 23 57 54.3528208608 -32 33 59.974464744   20.08 20.10     WC4 1 0
96 [BC2010] 47 WR* 23 57 54.704 -32 35 30.35   20.72 21.04     WC6 1 0
97 [BC2010] 48 * 23 57 54.849 -32 35 29.64   19.97 20.02     ~ 1 0
98 [BC2010] 49 WR* 23 57 55.219 -32 33 55.78   22.42 22.12     WN3 1 0
99 [BC2010] 50c * 23 57 55.8888358728 -32 34 41.522558448           ~ 1 0
100 [BC2010] 50a WR* 23 57 55.8888358728 -32 34 41.522558448   20.86 20.90     WC4 1 0
101 [BC2010] 50b * 23 57 55.979 -32 34 43.09   21.05 21.22     ~ 1 0
102 [BC2010] 51 * 23 57 56.310 -32 36 12.84   22.98 22.90     ~ 1 0
103 [BC2010] 52a * 23 57 56.875 -32 33 47.67   20 20.04     ~ 1 0
104 [BC2010] 52b * 23 57 56.919 -32 33 46.60   20.23 20.19     ~ 1 0
105 [DD80] 111 HII 23 57 56.968 -32 33 48.35           ~ 7 1
106 [DD80] 110 HII 23 57 57.041 -32 36 08.62           ~ 3 0
107 [BC2010] 53 * 23 57 57.171 -32 36 08.72   19.51 19.70     ~ 1 0
108 [BC2010] 54 * 23 57 57.2423143800 -32 36 11.349008136   20.65 20.56     ~ 1 0
109 [BC2010] 55 WR* 23 57 57.649 -32 35 39.16   23.44 23.84     WC5-6 1 0
110 [BC2010] 56 WR* 23 57 57.867 -32 34 50.81   23.17 23.46     WN2-4 1 0
111 [BC2010] 57 * 23 57 58.175 -32 35 40.98   22.08 21.96     ~ 1 0
112 [BC2010] 58a * 23 57 58.548 -32 34 32.92   20.08 20.12     ~ 1 0
113 [BC2010] 58b * 23 57 58.602 -32 34 30.72   20.36 20.41     ~ 1 0
114 [BC2010] 59 WR* 23 57 58.635 -32 35 46.19   22.86 23.21     ~ 1 0
115 [BC2010] 60 * 23 57 58.929 -32 36 46.90           ~ 1 0
116 [BC2010] 61a * 23 57 59.098 -32 36 50.32   19.66 19.72     ~ 1 0
117 [BC2010] 61b * 23 57 59.098 -32 36 48.96   19.96 19.96     ~ 1 0
118 [BC2010] 62 WR* 23 57 59.560 -32 36 42.42   22.44 22.16     WN2-4 1 0
119 [BC2010] 63 WR* 23 57 59.822 -32 34 23.47   45.38 23.38     WN2-4 1 0
120 [BC2010] GHR C HII 23 57 59.967 -32 33 23.84           ~ 1 0
121 [BC2010] 64 * 23 58 00.161 -32 35 33.11   19.77 20.03     ~ 1 0
122 [BC2010] 65 * 23 58 00.186 -32 33 22.03           ~ 1 0
123 [BC2010] 66 * 23 58 00.222 -32 34 01.40           ~ 1 0
124 [BC2010] 67 * 23 58 00.239 -32 34 46.21   21.16 21.07     ~ 1 0
125 [BC2010] 68 * 23 58 00.511 -32 34 10.54   20.55 20.52     ~ 1 0
126 [BC2010] 69 WR* 23 58 00.718 -32 35 48.95   20.75 20.92     WN2-4 1 0
127 [BC2010] 70b WR* 23 58 00.933 -32 33 56.59   20.42 20.63     WN2-4 1 0
128 [BC2010] 70a EmO 23 58 00.984 -32 33 56.22   20.04 20.16     ~ 1 0
129 [BC2010] 71 * 23 58 01.194 -32 33 37.19   20.31 20.31     ~ 1 0
130 [BC2010] 72 WR* 23 58 01.720 -32 33 46.37   22.14 22.37     WN2-4 1 0
131 CXO J235802.8-323614 QSO 23 58 02.8902579384 -32 36 14.244348960   20.99 20.79     ~ 4 0
132 [BC2010] 73a WR* 23 58 06.631 -32 34 53.44           WC4 1 0
133 [BC2010] 73b * 23 58 06.666 -32 34 51.68           ~ 1 0
134 [BC2010] GHR B HII 23 58 06.730 -32 34 58.00           ~ 1 0
135 [BC2010] 74a * 23 58 06.898 -32 34 56.17           ~ 1 0
136 [BC2010] 74b * 23 58 07.005 -32 34 55.94           ~ 1 0
137 [BC2010] GHR D HII 23 58 08.807 -32 36 47.68           ~ 1 0
138 NAME Local Group GrG ~ ~           ~ 9325 0

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