1998ApJ...508..664E

Query : 1998ApJ...508..664E

1998ApJ...508..664E - Astrophys. J., 508, 664-668 (1998/December-1)

The probable detection of SN 1923A: the oldest radio supernova?.

ECK C.R., ROBERTS D.A., COWAN J.J. and BRANCH D.

Abstract (from CDS):

Based on the results of VLA observations, we report the detection of two unresolved radio sources that are coincident with the reported optical position of SN 1923A in M83. For the source closest to the SN position, the flux density was determined to be 0.30±0.05 mJy at 20 cm and 0.093±0.028 mJy at 6 cm. The flux density of the second nearby source was determined to be 0.29±0.05 mJy at 20 cm and 0.13±0.028 mJy at 6 cm. Both sources are nonthermal, with spectral indices of α = -1.0±0.30 and -0.69 ±0.24, respectively. SN 1923A has been designated a Type II-P. No Type II-P (other than SN 1987A) has been detected previously in the radio. The radio emission from both sources appears to be fading with time. At an age of approximately 68 yr when we observed it, this would be the oldest radio SN (of known age) yet detected.

Abstract Copyright: ∼

Journal keyword(s): Stars: Circumstellar Matter - Galaxies: Individual: NGC Number: NGC 5236 - Stars: Supernovae: General - Stars: Supernovae: Individual: Alphanumeric: SN 1923A

Nomenclature: Table 2: [ERC98] 133420.18-293546.6 N=1

Simbad objects: 40

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Number of rows : 40
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 SN 1986J SN* 02 22 31.33 +42 19 56.4   18.4 18.4     SNII 331 1
2 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1741 2
3 SN 1984L SN* 02 35 30.54 -07 09 30.3   14.0       SNIb 197 1
4 SN 1961V SN* 02 43 36.42 +37 20 43.6   12.7 12.5     SNIIpec? 212 2
5 SN 1978K SN* 03 17 38.620 -66 33 03.40   13.0       SNII 214 1
6 NGC 1313 AG? 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 723 2
7 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
8 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
9 SN 1987A SN* 05 35 27.98840 -69 16 11.1134           SNIIpec 5203 2
10 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1507 1
11 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
12 Z 95-49 G 10 51 49.39912 +16 00 01.5321   15.6       ~ 45 0
13 SN 1988Z SN* 10 51 50.10 +16 00 00.5   16.8       SNIIn 385 1
14 SN 1981K SN* 12 18 59.42 +47 19 31.0   16.0 16.0     SNII 51 1
15 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1963 2
16 SN 1979C SN* 12 22 58.58 +15 47 52.7   11.6       SNIIL 609 1
17 SN 1990B SN* 12 36 33.86 +11 14 29.9     15.75     SNIc 131 1
18 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
19 SN 1945B SN* 13 36 51 -30 10.3   13.9       ~ 31 1
20 SN 1983N SN* 13 36 51.23 -29 54 01.7   11.7       SNIb 278 1
21 SN 1950B SN* 13 36 52.88 -29 51 55.7   14.5 14.5     ~ 58 1
22 [CB85] zet Rad 13 36 59.05 -29 51 16.2           ~ 2 0
23 SN 1968L SN* 13 37 00.42 -29 51 59.8   12.0 12.0     SNIIP 83 1
24 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
25 [CB85] 6 Rad 13 37 03.2 -29 52 27           ~ 3 0
26 [CB85] 8 HII 13 37 03.40 -29 54 02.3           ~ 9 0
27 SN 1957D SN* 13 37 03.57 -29 49 40.7   15.0 15.0     ~ 121 1
28 [CB85] 7 Rad 13 37 06.6 -29 53 32           ~ 3 0
29 [MCK2006] 42 HII 13 37 07.0 -29 49 35           ~ 8 0
30 [CB85] del Rad 13 37 07.9 -29 51 16           ~ 4 0
31 [MCK2006] 50 HII 13 37 08.5 -29 52 10           ~ 10 0
32 SN 1923A SN* 13 37 09.2 -29 51 04   12.4 14.0     SNIIP: 80 1
33 [ERC98] 133420.18-293546.6 Rad 13 37 09.38 -29 51 02.7           ~ 1 0
34 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
35 SN 1970G SN* 14 03 00.83 +54 14 32.8   11.8 11.50     SNIIL 221 1
36 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
37 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2661 2
38 SN 1968D SN* 20 34 58.40 +60 09 34.4   13.5 13.5     SNII 74 1
39 SN 1980K SN* 20 35 30.07 +60 06 23.7   11.6       SNIIL 482 1
40 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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