2019ApJ...875...85L

Query : 2019ApJ...875...85L

2019ApJ...875...85L - Astrophys. J., 875, 85-85 (2019/April-3)

A new, larger sample of supernova remnants in NGC 6946.

LONG K.S., WINKLER P.F. and BLAIR W.P.

Abstract (from CDS):

The relatively nearby spiral galaxy NGC 6946 is one of the most actively star-forming galaxies in the local universe. Ten supernovae (SNe) have been observed since 1917, and hence NGC 6946 surely contains a large number of supernova remnants (SNRs). Here we report a new optical search for these SNRs using narrowband images obtained with the WIYN telescope. We identify 147 emission nebulae as likely SNRs, based on elevated [S II]:Hα ratios compared to H II regions. We have obtained spectra of 102 of these nebulae with Gemini North-GMOS; of these, 89 have [S II]:Hα ratios greater than 0.4, the canonical optical criterion for identifying SNRs. There is very little overlap between our sample and the SNR candidates identified by Lacey et al. from radio data. Also, very few of our SNR candidates are known X-ray sources, unlike the situation in some other galaxies such as M33 and M83. The emission-line ratios, e.g., [N II]:Hα, of the candidates in NGC 6946 are typical of those observed in SNR samples from other galaxies with comparable metallicity. None of the candidates observed in our low-resolution spectra show evidence of anomalous abundances or significant velocity broadening. A search for emission at the sites of all the historical SNe in NGC 6946 resulted in detections for only two: SN 1980K and SN 2004et. Spectra of both show very broad, asymmetric line profiles, consistent with the interaction between SN ejecta and the progenitor star's circumstellar material, as seen in late spectra from other core-collapse SNe of similar age.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: individual: NGC 6946 - ISM: supernova remnants - supernovae: individual: (SN 1980K, SN 2004et)

VizieR on-line data: <Available at CDS (J/ApJ/875/85): table2.dat table4.dat>

Nomenclature: Table 2: [LWB2019] NNN (Nos 1-147).

Simbad objects: 167

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Number of rows : 167
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11145 1
2 SNR B0102-72.3 SNR 01 04 01.2 -72 01 52           ~ 397 1
3 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5838 1
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17428 0
5 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1125 1
6 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2572 2
7 SN 1957D SN* 13 37 03.57 -29 49 40.7   15.0 15.0     ~ 118 1
8 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1328 1
9 [LWB2019] 1 EmO 20 34 15.00 +60 10 44.3           ~ 3 0
10 [LWB2019] 2 EmO 20 34 15.48 +60 07 31.6           ~ 3 0
11 [LWB2019] 3 EmO 20 34 15.78 +60 08 26.0           ~ 3 0
12 [LWB2019] 4 EmO 20 34 16.41 +60 08 27.3           ~ 3 0
13 [LWB2019] 5 EmO 20 34 16.68 +60 07 30.8           ~ 3 0
14 [LWB2019] 6 SNR 20 34 17.54 +60 10 58.3           ~ 3 0
15 [LWB2019] 7 SNR 20 34 17.95 +60 10 00.4           ~ 3 0
16 [LWB2019] 8 EmO 20 34 18.39 +60 10 47.3           ~ 3 0
17 [LWB2019] 9 SNR 20 34 18.84 +60 11 08.9           ~ 3 0
18 [LWB2019] 10 SNR 20 34 19.17 +60 08 57.5           ~ 3 0
19 [LWB2019] 11 SNR 20 34 20.60 +60 09 06.8           ~ 3 0
20 [LWB2019] 12 EmO 20 34 21.96 +60 08 57.8           ~ 3 0
21 [LWB2019] 13 SNR 20 34 22.70 +60 06 13.4           ~ 3 0
22 [LWB2019] 14 SNR 20 34 23.30 +60 08 18.6           ~ 6 0
23 [LWB2019] 15 SNR 20 34 23.39 +60 11 35.3           ~ 3 0
24 SN 1939C SN* 20 34 24.0678381888 +60 09 29.851268436   13.7 13.8     SNI: 40 1
25 [LWB2019] 16 SNR 20 34 24.43 +60 11 25.8           ~ 3 0
26 [LWB2019] 17 EmO 20 34 24.93 +60 09 46.5           ~ 3 0
27 [LWB2019] 18 EmO 20 34 25.37 +60 08 56.4           ~ 3 0
28 [LWB2019] 19 SNR 20 34 26.00 +60 11 10.6           ~ 6 0
29 [LWB2019] 20 EmO 20 34 26.06 +60 13 22.8           ~ 3 0
30 [LWB2019] 21 EmO 20 34 26.17 +60 10 11.9           ~ 3 0
31 [LWB2019] 22 EmO 20 34 27.65 +60 11 12.2           ~ 3 0
32 [LWB2019] 23 EmO 20 34 28.22 +60 11 37.9           ~ 3 0
33 [LWB2019] 24 EmO 20 34 28.32 +60 13 21.9           ~ 3 0
34 [LWB2019] 25 SNR 20 34 28.33 +60 07 04.2           ~ 3 0
35 [LWB2019] 26 EmO 20 34 28.40 +60 08 09.5           ~ 3 0
36 [LWB2019] 27 EmO 20 34 28.44 +60 07 33.4           ~ 3 0
37 [LWB2019] 28 EmO 20 34 28.86 +60 07 45.4           ~ 3 0
38 [FHL2008] NGC 6946 8 EmO 20 34 29.17 +60 10 51.1           ~ 3 0
39 [LWB2019] 30 SNR 20 34 30.13 +60 10 24.4           ~ 3 0
40 [LWB2019] 31 SNR 20 34 31.67 +60 10 28.0           ~ 3 0
41 [LWB2019] 32 EmO 20 34 32.60 +60 10 27.9           ~ 3 0
42 [LWB2019] 33 SNR 20 34 33.05 +60 11 25.7           ~ 3 0
43 [LWB2019] 34 EmO 20 34 33.31 +60 09 46.7           ~ 3 0
44 [LWB2019] 35 SNR 20 34 33.60 +60 09 52.4           ~ 6 0
45 [HSH2003] 15 SNR 20 34 36.48 +60 09 30.4           ~ 18 0
46 [LWB2019] 37 SNR 20 34 36.63 +60 11 34.4           ~ 3 0
47 [LWB2019] 38 SNR 20 34 37.38 +60 07 15.0           ~ 3 0
48 [LWB2019] 39 SNR 20 34 37.44 +60 11 31.4           ~ 3 0
49 [LWB2019] 40 SNR 20 34 37.60 +60 08 52.7           ~ 7 0
50 [LWB2019] 41 SNR 20 34 37.80 +60 11 54.5           ~ 6 0
51 [LWB2019] 42 SNR 20 34 37.90 +60 07 22.5           ~ 6 0
52 [LWB2019] 43 EmO 20 34 38.36 +60 06 09.4           ~ 3 0
53 [LWB2019] 44 SNR 20 34 38.90 +60 06 57.7           ~ 3 0
54 [LWB2019] 45 EmO 20 34 39.15 +60 09 19.0           ~ 3 0
55 [LWB2019] 46 SNR 20 34 39.19 +60 08 13.9           ~ 3 0
56 [LWB2019] 47 EmO 20 34 39.65 +60 07 26.0           ~ 3 0
57 [LWB2019] 48 SNR 20 34 40.63 +60 06 53.5           ~ 3 0
58 [LWB2019] 49 SNR 20 34 40.73 +60 08 34.0           ~ 3 0
59 [LWB2019] 50 EmO 20 34 41.02 +60 05 57.9           ~ 3 0
60 [LWB2019] 52 EmO 20 34 41.32 +60 04 54.9           ~ 3 0
61 [LWB2019] 51 SNR 20 34 41.32 +60 11 13.0           ~ 3 0
62 [LWB2019] 53 SNR 20 34 41.53 +60 11 30.0           ~ 3 0
63 [LWB2019] 54 SNR 20 34 41.93 +60 05 50.0           ~ 3 0
64 [LWB2019] 55 SNR 20 34 42.44 +60 09 16.0           ~ 3 0
65 [LWB2019] 56 EmO 20 34 43.08 +60 11 39.4           ~ 3 0
66 [LWB2019] 57 EmO 20 34 43.32 +60 10 11.1           ~ 3 0
67 [LWB2019] 58 EmO 20 34 43.53 +60 07 51.7           ~ 3 0
68 [LWB2019] 59 SNR 20 34 43.90 +60 08 24.6           ~ 6 0
69 SN 2017eaw SN* 20 34 44.238 +60 11 36.00           SNIIP 113 0
70 SN 2002hh SN* 20 34 44.29 +60 07 19.0     17.18     SNIIP 152 1
71 [LWB2019] 60 SNR 20 34 44.61 +60 08 17.3           ~ 3 0
72 [LWB2019] 61 SNR 20 34 45.13 +60 12 36.4           ~ 3 0
73 SN 2008S ev 20 34 45.33 +60 05 58.4   19.89 18.79 17.93   SNIIn? 239 1
74 [LWB2019] 62 SNR 20 34 45.67 +60 07 21.2           ~ 3 0
75 SN 1917A SN* 20 34 46.9 +60 07 29   13.6       SNII 51 1
76 [LWB2019] 63 SNR 20 34 46.92 +60 12 19.4           ~ 3 0
77 [LWB2019] 64 SNR 20 34 47.19 +60 08 20.2           ~ 3 0
78 [LWB2019] 65 SNR 20 34 47.37 +60 08 22.7           ~ 3 0
79 [LDG97] 34 SNR 20 34 47.75 +60 09 58.7           ~ 5 0
80 [LWB2019] 67 SNR 20 34 48.09 +60 07 50.5           ~ 3 0
81 [LWB2019] 68 SNR 20 34 48.64 +60 09 24.4           ~ 3 0
82 [LWB2019] 69 SNR 20 34 48.72 +60 08 23.4           ~ 3 0
83 [LWB2019] 70 SNR 20 34 49.66 +60 07 37.0           ~ 3 0
84 [LWB2019] 71 EmO 20 34 49.80 +60 09 41.3           ~ 3 0
85 [LWB2019] 72 SNR 20 34 49.95 +60 07 53.5           ~ 3 0
86 [LWB2019] 73 EmO 20 34 50.02 +60 09 43.3           ~ 3 0
87 [LWB2019] 74 SNR 20 34 50.36 +60 09 45.2           ~ 3 0
88 [LWB2019] 75 EmO 20 34 50.37 +60 09 51.8           ~ 3 0
89 [BML2014] 20 SNR 20 34 50.8152 +60 07 47.949           ~ 4 0
90 [FHL2008] NGC 6946 45 SNR 20 34 50.94 +60 10 20.6           ~ 10 0
91 [LWB2019] 78 EmO 20 34 51.29 +60 05 20.4           ~ 3 0
92 SN 1969P SN* 20 34 51.3 +60 06 14   14.2       ~ 32 1
93 [LDG97] 51 SNR 20 34 51.50 +60 07 39.0           ~ 11 0
94 [FHL2008] NGC 6946 47 SNR 20 34 51.50 +60 09 09.1           ~ 6 0
95 [LWB2019] 81 EmO 20 34 51.66 +60 09 57.2           ~ 3 0
96 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2527 2
97 [LWB2019] 82 SNR 20 34 52.50 +60 07 28.3           ~ 6 0
98 [LWB2019] 83 SNR 20 34 52.51 +60 10 01.9           ~ 3 0
99 [LWB2019] 84 SNR 20 34 52.56 +60 10 52.3           ~ 3 0
100 [LWB2019] 85 SNR 20 34 53.09 +60 08 14.1           ~ 3 0
101 [LDG97] 68 SNR 20 34 53.71 +60 07 13.9           ~ 5 0
102 [LWB2019] 87 SNR 20 34 54.20 +60 11 03.5           ~ 6 0
103 [LWB2019] 88 SNR 20 34 54.41 +60 10 55.9           ~ 3 0
104 [LWB2019] 89 SNR 20 34 54.55 +60 05 08.6           ~ 3 0
105 [LWB2019] 90 SNR 20 34 54.80 +60 10 06.8           ~ 3 0
106 [LWB2019] 91 SNR 20 34 54.87 +60 10 34.6           ~ 3 0
107 [LWB2019] 92 EmO 20 34 55.62 +60 11 13.7           ~ 3 0
108 [LWB2019] 93 SNR 20 34 55.90 +60 07 49.2           ~ 6 0
109 [FHL2008] NGC 6946 53 SNR 20 34 56.58 +60 08 19.9           ~ 3 0
110 [BML2014] 25 SNR 20 34 57.80 +60 08 10.0           ~ 7 0
111 SN 1968D SN* 20 34 58.40 +60 09 34.4   13.5 13.5     SNII 71 1
112 [LWB2019] 96 SNR 20 34 58.49 +60 08 01.8           ~ 3 0
113 [LWB2019] 97 SNR 20 35 00.30 +60 11 46.2           ~ 8 0
114 NAME NGC 6946 SNR SNR 20 35 00.74 +60 11 30.6           ~ 107 0
115 [LWB2019] 99 SNR 20 35 01.10 +60 12 00.3           ~ 6 0
116 [LWB2019] 100 SNR 20 35 02.24 +60 11 05.2           ~ 3 0
117 [LWB2019] 101 SNR 20 35 02.30 +60 06 31.2           ~ 6 0
118 [LWB2019] 104 SNR 20 35 02.90 +60 05 26.7           ~ 6 0
119 [LWB2019] 102 SNR 20 35 02.93 +60 11 27.2           ~ 3 0
120 [LWB2019] 103 SNR 20 35 03.17 +60 10 41.9           ~ 3 0
121 [LWB2019] 105 EmO 20 35 03.59 +60 06 23.4           ~ 3 0
122 [LDG97] 88 SNR 20 35 04.04 +60 09 54.3           ~ 6 0
123 [LWB2019] 106 SNR 20 35 04.06 +60 11 15.6           ~ 3 0
124 [LWB2019] 107 EmO 20 35 04.19 +60 11 18.5           ~ 3 0
125 [LWB2019] 109 SNR 20 35 04.27 +60 06 52.1           ~ 3 0
126 [LWB2019] 110 EmO 20 35 05.00 +60 05 32.9           ~ 3 0
127 [LWB2019] 111 SNR 20 35 05.50 +60 10 01.0           ~ 6 0
128 [LDG97] 95 SNR 20 35 05.69 +60 11 07.6           ~ 5 0
129 [LWB2019] 113 SNR 20 35 06.89 +60 07 58.4           ~ 3 0
130 [LWB2019] 114 SNR 20 35 06.96 +60 09 57.0           ~ 3 0
131 [LWB2019] 115 EmO 20 35 07.07 +60 05 57.3           ~ 3 0
132 [LWB2019] 116 SNR 20 35 08.80 +60 06 03.0           ~ 6 0
133 [LWB2019] 117 EmO 20 35 08.89 +60 10 13.0           ~ 3 0
134 [LWB2019] 118 EmO 20 35 09.56 +60 09 13.1           ~ 3 0
135 [LWB2019] 119 SNR 20 35 09.60 +60 12 30.2           ~ 6 0
136 [LWB2019] 120 EmO 20 35 09.87 +60 06 13.3           ~ 3 0
137 [LWB2019] 121 SNR 20 35 10.22 +60 06 26.7           ~ 3 0
138 [LWB2019] 122 EmO 20 35 10.54 +60 06 41.3           ~ 3 0
139 [LWB2019] 123 SNR 20 35 10.63 +60 10 40.9           ~ 3 0
140 [FHL2008] NGC 6946 74 EmO 20 35 10.89 +60 08 56.9           ~ 3 0
141 [LWB2019] 125 SNR 20 35 11.04 +60 08 27.1           ~ 3 0
142 [LWB2019] 126 SNR 20 35 11.45 +60 11 11.9           ~ 3 0
143 [LWB2019] 127 SNR 20 35 11.60 +60 07 41.2           ~ 6 0
144 [LWB2019] 128 SNR 20 35 11.90 +60 09 28.6           ~ 3 0
145 [LWB2019] 129 EmO 20 35 11.94 +60 04 03.7           ~ 3 0
146 [LWB2019] 130 EmO 20 35 12.25 +60 06 37.6           ~ 3 0
147 [LWB2019] 131 SNR 20 35 12.62 +60 09 09.7           ~ 3 0
148 [LWB2019] 132 SNR 20 35 13.62 +60 08 58.9           ~ 3 0
149 [LWB2019] 133 SNR 20 35 14.44 +60 07 12.7           ~ 3 0
150 [LWB2019] 134 EmO 20 35 16.52 +60 07 50.1           ~ 3 0
151 [LWB2019] 135 SNR 20 35 16.90 +60 11 05.8           ~ 6 0
152 [LWB2019] 136 SNR 20 35 17.33 +60 10 27.3           ~ 3 0
153 [LWB2019] 137 EmO 20 35 17.56 +60 07 19.3           ~ 3 0
154 [FHL2008] NGC 6946 82 SNR 20 35 20.08 +60 09 33.9           ~ 3 0
155 [LWB2019] 139 EmO 20 35 20.80 +60 09 52.7           ~ 3 0
156 [LWB2019] 140 SNR 20 35 21.10 +60 08 44.4           ~ 6 0
157 SN 1948B SN* 20 35 21.5 +60 10 16   14.0 14.0     SNIIP 75 1
158 [LWB2019] 141 SNR 20 35 23.02 +60 08 21.2           ~ 3 0
159 [LWB2019] 142 EmO 20 35 23.66 +60 08 47.7           ~ 3 0
160 [LWB2019] 143 EmO 20 35 24.22 +60 07 42.5           ~ 3 0
161 [LWB2019] 144 EmO 20 35 24.66 +60 06 57.2           ~ 3 0
162 [LWB2019] 145 EmO 20 35 25.24 +60 07 26.9           ~ 3 0
163 SN 2004et SN* 20 35 25.33 +60 07 17.7   12.88       SNIIP 489 1
164 [LWB2019] 146 SNR 20 35 25.50 +60 07 51.2           ~ 6 0
165 [LWB2019] 147 SNR 20 35 26.00 +60 08 43.0           ~ 6 0
166 SN 1980K SN* 20 35 30.07 +60 06 23.7   11.6       SNIIL 464 1
167 3C 461 BL? 23 23 24.000 +58 48 54.00     14.30     ~ 2791 1

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