2012A&A...539A.134B


Query : 2012A&A...539A.134B

2012A&A...539A.134B - Astronomy and Astrophysics, volume 539A, 134-134 (2012/3-1)

The nuclear starburst in Arp 299-A: from the 5.0 GHz VLBI radio light-curves to its core-collapse supernova rate.

BONDI M., PEREZ-TORRES M.A., HERRERO-ILLANA R. and ALBERDI A.

Abstract (from CDS):

The nuclear region of the luminous infrared galaxy (LIRG) Arp 299-A hosts a recent (≃10Myr) intense burst of massive star formation that is expected to lead to numerous core-collapse supernovae (CCSNe). Previous VLBI observations, carried out with the European VLBI Network (EVN) at 5.0GHz and with the VLBA at 2.3 and 8.4GHz, resulted in the detection of many compact, bright, non-thermal sources in a region ≲150pc in size. We aim to establish the nature of all non-thermal compact components in Arp 299-A, as well as to estimate its core-collapse supernova rate. While the majority of the compact components are expected to be young radio supernovae (RSNe) and supernova remnants (SNRs), a definitive classification is still lacking. Yet, this is very relevant for eventually establishing the CCSN rate, as well as the star formation rate, for this galaxy. We used multi-epoch EVN observations taken at 5.0GHz to image the compact radio sources in the nuclear region of Arp 299-A with milliarcsecond resolution. We also used one single-epoch 5.0GHz Multi-Element Radio Linked Interferometer Network (MERLIN) observation to image the extended emission in which these compact radio sources are embedded. We present the first 5.0GHz radio light-curve (spanning ∼2.5yr) of all compact components in the nuclear starburst of Arp 299-A. Twenty-six compact sources are detected, eight of which are new objects. The properties of all detected objects are consistent with them being a mixed population of CCSNe and SNRs. We find clear evidence for at least two new CCSNe, implying a lower limit to the CCSN rate of νSN>0.80SN/yr, indicating that the bulk of the current star formation in Arp 299-A is taking place in the innermost ∼150pc. A few more objects show variability consistent with them being recently exploded SNe, but only future observations will clarify this point. Our MERLIN observations trace a region of diffuse extended emission that is cospatial to the region where all compact sources are found. From this diffuse non-thermal radio emission traced by MERLIN we obtain an independent estimate for the CCSN rate, which is in the range νSN=0.40-0.65SN/yr, in agreement with previous estimates and our direct estimate of the CCSN rate from the compact radio emission. Our ∼2.5yr monitoring of Arp 299-A has allowed us to obtain for the first time a direct estimate of the CCSN rate of νSN>0.80SN/yr for the innermost ∼150pc of Arp 299-A.

Abstract Copyright:

Journal keyword(s): galaxies: starburst - galaxies: luminosity function,mass function - galaxies: individual: Arp 299 - supernovae: general - radiation mechanisms: non-thermal - radio continuum: stars

Nomenclature: Fig. 1, Tables 1-2: [PRA2009] ANN (Nos A26-A30) added.

Simbad objects: 39

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Number of rows : 39
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 3859 3
2 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 818 1
3 ICRF J092703.0+390220 Sy1 09 27 03.01394144 +39 02 20.8518067   17.17 17.00 16.486   ~ 971 1
4 6C 112519+594222 Bla 11 28 13.34067181 +59 25 14.7985568   19.78 19.56 19.33   ~ 79 1
5 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 950 4
6 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 629 4
7 [PRA2009] A3 SNR 11 28 33.5942 +58 33 46.560           ~ 4 0
8 [PRA2009] A15 SN* 11 28 33.5991 +58 33 46.638           ~ 3 0
9 [PRA2009] A26 Rad 11 28 33.6132 +58 33 46.652           ~ 2 0
10 [PRA2009] A16 Rad 11 28 33.6149 +58 33 46.516           ~ 2 0
11 [PRA2009] A5 SR? 11 28 33.6176 +58 33 46.693           ~ 3 0
12 [PRA2009] A18 Rad 11 28 33.6192 +58 33 46.464           ~ 3 0
13 [PRA2009] A19 SR? 11 28 33.6196 +58 33 46.659           ~ 3 0
14 [PRA2009] A1 SNR 11 28 33.6199 +58 33 46.699           ~ 3 0
15 [U2009] 33.621+46.60 SN* 11 28 33.6209 +58 33 46.597           ~ 4 0
16 [PRA2009] A0 SN* 11 28 33.6212 +58 33 46.707           ~ 4 0
17 [PRA2009] A2 SNR 11 28 33.6219 +58 33 46.655           ~ 4 0
18 [PRA2009] A27 Rad 11 28 33.6221 +58 33 46.692           ~ 4 0
19 [PRA2009] A28 Rad 11 28 33.6272 +58 33 46.719           ~ 2 0
20 [PRA2009] A7 SNR 11 28 33.6300 +58 33 46.786           ~ 3 0
21 [PRA2009] A8 SNR 11 28 33.6306 +58 33 46.401           ~ 3 0
22 [PRA2009] A9 SNR 11 28 33.6306 +58 33 46.620           ~ 3 0
23 [PRA2009] A29 Rad 11 28 33.6344 +58 33 46.915           ~ 2 0
24 [PRA2009] A22 Rad 11 28 33.6354 +58 33 46.678           ~ 3 0
25 [PRA2009] A24 Rad 11 28 33.6361 +58 33 46.764           ~ 2 0
26 [PRA2009] A30 Rad 11 28 33.6362 +58 33 46.863           ~ 2 0
27 [PRA2009] A10 SNR 11 28 33.6392 +58 33 46.551           ~ 3 0
28 [PRA2009] A11 SNR 11 28 33.6403 +58 33 46.583           ~ 3 0
29 [PRA2009] A31 Rad 11 28 33.6441 +58 33 46.629           ~ 2 0
30 [U2009] 33.650+46.59 SN* 11 28 33.6495 +58 33 46.589           ~ 4 0
31 [PRA2009] A4 SNR 11 28 33.6501 +58 33 46.537           ~ 4 0
32 [PRA2009] A25 SN* 11 28 33.6524 +58 33 46.701           SNIIp 4 0
33 [PRA2009] A13 SR? 11 28 33.6531 +58 33 46.733           ~ 3 0
34 [PRA2009] A14 SNR 11 28 33.6825 +58 33 46.571           ~ 3 0
35 SN 2010O SN* 11 28 33.86 +58 33 51.6           SNIb 32 1
36 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4171 2
37 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2873 4
38 3C 345 QSO 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1653 2
39 LEDA 90429 SyG 23 39 01.274 +36 21 08.77   16.17       ~ 209 1

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2023.02.01-19:46:32

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