2013MNRAS.431.1107G

Query : 2013MNRAS.431.1107G

2013MNRAS.431.1107G - Mon. Not. R. Astron. Soc., 431, 1107-1120 (2013/May-2)

Flux density variations of radio sources in M82 over the last three decades.

GENDRE M.A., FENECH D.M., BESWICK R.J., MUXLOW T.W.B. and ARGO M.K.

Abstract (from CDS):

This paper presents the results of the 2009-2010 monitoring sessions of the starburst galaxy M82, obtained with the Multi-Element Radio-Linked Interferometer Network (MERLIN) at 5 GHz and e-MERLIN at 6 GHz. Combining several 5 GHz MERLIN epochs to form a map with 33.0 µJy bm-1 noise level, 52 discrete sources, mostly supernova remnants and H ii regions, are identified. These include three objects which were not detected in the 2002 5 GHz MERLIN monitoring session: supernova SN2008iz, the transient source 43.78+59.3, and a new supernova remnant shell. Flux density variations, in the long (1981 to 2010), medium (2002 to 2010) and short (2009 to 2010) term are investigated. We find that flux densities of supernova remnants (SNRs) in M82 stay constant in most of the sample ( ∼ 95 per cent), although the distributions of flux density variations show an offset from zero. This is consistent with a slight statistical reduction in flux density of the source distribution. In addition, aside from SN2008iz and the well-known variable source 41.95+57.5, two sources display tentative evidence for short- and medium-term variations over the period 2009-2010. These sources are amongst the most compact SNR in M82. These flux density variations could be due to changes in the circumstellar and interstellar medium in which the shocks travel.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): galaxies: individual: M82 - galaxies: starburst - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/431/1107): table2.dat tablea1.dat>

Nomenclature: Table A1: [FMB2008] SS.ss+SS.s (Nos 42.81+59.6, 43.78+59.3, 44.28+61.1) added.

CDS comments: Calibrator 0955+697 not identified (not enough information).

Simbad objects: 60

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Number of rows : 60
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 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 [FBM2010] 39.10+57.3 SNR 09 55 47.880 +69 40 43.72           ~ 24 0
5 [FBM2010] 39.28+54.1 HII 09 55 48.040 +69 40 40.59           ~ 9 0
6 [FBM2010] 39.40+56.2 SNR 09 55 48.160 +69 40 43.00           ~ 16 0
7 [FBM2010] 39.64+53.3 SNR 09 55 48.400 +69 40 39.82           ~ 15 0
8 [FMB2008] 39.67+55.5 HII 09 55 48.43 +69 40 41.9           ~ 9 0
9 [FMB2008] 39.77+56.9 SNR 09 55 48.55 +69 40 43.3           ~ 10 0
10 [FBM2010] 40.32+55.2 SNR 09 55 49.060 +69 40 41.53           ~ 12 0
11 [FBM2010] 40.61+56.3 SNR 09 55 49.370 +69 40 42.44           ~ 16 0
12 [FBM2010] 40.68+55.1 SNR 09 55 49.420 +69 40 41.43           ~ 20 0
13 [GIB2011] 3 HII 09 55 49.69 +69 40 45.2           ~ 8 0
14 [GIB2011] 5 HII 09 55 49.92 +69 40 42.5           ~ 6 0
15 [FBM2010] 41.30+59.6 SNR 09 55 50.050 +69 40 45.92           ~ 24 0
16 [MMW2002] 41.64+57.9 HII 09 55 50.38 +69 40 44.2           ~ 5 0
17 CXOM82 J095550.9+694044 HXB 09 55 50.690 +69 40 43.76           ~ 96 0
18 [FMB2008] 42.08+58.4 HII 09 55 50.82 +69 40 44.7           ~ 2 0
19 [FMB2008] 42.20+59.1 HII 09 55 50.94 +69 40 45.3           ~ 29 1
20 [FMB2008] 42.43+59.5 Rad 09 55 51.15 +69 40 45.6           ~ 1 0
21 [FMB2008] 42.48+58.4 HII 09 55 51.25 +69 40 44.2           ~ 1 0
22 [KBS85] 42.6+60.5 SNR 09 55 51.35 +69 40 46.9           ~ 4 0
23 [FBM2010] 42.67+55.6 SNR 09 55 51.390 +69 40 41.80           ~ 16 0
24 [FBM2010] 42.67+56.3 SNR 09 55 51.400 +69 40 42.63           ~ 5 0
25 [FMB2008] 42.69+58.2 HII 09 55 51.44 +69 40 44.3           ~ 4 0
26 SN 2008iz SN* 09 55 51.55 +69 40 45.8           SNII: 63 1
27 [FBM2010] 42.80+61.2 SNR 09 55 51.550 +69 40 47.54           ~ 12 0
28 [FBM2010] 43.18+58.2 SNR 09 55 51.910 +69 40 44.57           ~ 3 0
29 [FBM2010] 43.31+59.2 SNR 09 55 52.030 +69 40 45.42           ~ 32 0
30 [RVZ2004] 43.39+62.6 SNR 09 55 52.14 +69 40 48.7           ~ 3 0
31 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
32 [FBM2010] 43.72+62.0 SNR 09 55 52.450 +69 40 48.80           ~ 5 0
33 EQ J095552.5+694045.4 Rad 09 55 52.5083 +69 40 45.420           ~ 12 1
34 [KBS85] 43.8+62.8 SNR 09 55 52.54 +69 40 49.0           ~ 4 0
35 NAME 44.0+59.5 SNR 09 55 52.730 +69 40 45.78           ~ 45 1
36 [FMB2008] 44.08+63.1 SNR 09 55 52.75 +69 40 49.5           ~ 2 0
37 [FBM2010] 44.28+59.3 SNR 09 55 52.990 +69 40 45.49           ~ 18 0
38 [FMB2008] 44.28+61.1 SR? 09 55 53.00 +69 40 47.4           ~ 1 0
39 [FBM2010] 44.34+57.8 SNR 09 55 53.050 +69 40 43.94           ~ 5 0
40 [FBM2010] 44.40+61.8 SNR 09 55 53.150 +69 40 48.04           ~ 8 0
41 [FBM2010] 44.51+58.2 SNR 09 55 53.230 +69 40 44.36           ~ 19 0
42 [FBM2010] 44.89+61.2 SNR 09 55 53.610 +69 40 47.36           ~ 12 0
43 [MMW2002] 44.93+63.9 HII 09 55 53.64 +69 40 50.0           ~ 4 0
44 [FBM2010] 45.17+61.2 SNR 09 55 53.880 +69 40 47.43 20.412 20.009 19.315   18.763 ~ 28 0
45 [FBM2010] 45.24+65.2 SNR 09 55 53.960 +69 40 51.29           ~ 17 0
46 [FBM2010] 45.39+60.3 Rad 09 55 54.070 +69 40 46.50           ~ 3 0
47 [FBM2010] 45.42+64.7 SNR 09 55 54.130 +69 40 53.58           ~ 19 0
48 [FBM2010] 45.48+64.7 SNR 09 55 54.220 +69 40 50.94           ~ 10 0
49 [FMB2008] 45.62+67.0 HII 09 55 54.32 +69 40 53.1           ~ 1 0
50 [FBM2010] 45.75+65.3 SNR 09 55 54.460 +69 40 51.43           ~ 19 0
51 [FBM2010] 45.79+64.0 SNR 09 55 54.5322387360 +69 40 49.332992124           ~ 3 0
52 [FBM2010] 45.89+63.9 SNR 09 55 54.5322387360 +69 40 49.332992124           ~ 16 0
53 [RVZ2004] 46.17+67.6 HII 09 55 54.89 +69 40 53.8           ~ 7 0
54 [FMB2008] 46.34+66.2 Rad 09 55 55.06 +69 40 52.5           ~ 1 0
55 [FBM2010] 46.52+63.9 SNR 09 55 55.220 +69 40 50.01           ~ 20 0
56 [FBM2010] 46.70+67.1 SNR 09 55 55.410 +69 40 53.17           ~ 20 0
57 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
58 Mrk 668 BLL 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 826 3
59 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
60 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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