2010A&A...519L...5P


Query : 2010A&A...519L...5P

2010A&A...519L...5P - Astronomy and Astrophysics, volume 519, L5-5 (2010/9-1)

Serendipitous discovery of the long-sought active galactic nucleus in Arp 299-A.

PEREZ-TORRES M.A., ALBERDI A., ROMERO-CANIZALES C. and BONDI M.

Abstract (from CDS):

The dusty nuclear regions of luminous infra-red galaxies (LIRGs) are heated by either an intense burst of massive star formation, an active galactic nucleus (AGN), or a combination of both. Disentangling the contribution of each of those putative dust-heating agents is a challenging task, and direct imaging of the innermost few pc can only be accomplished at radio wavelengths, using very high-angular resolution observations. We observed the nucleus A of the interacting starburst galaxy Arp 299, using very long baseline interferometry (VLBI) radio observations at 1.7 and 5.0GHz. Our aim was to characterize the compact sources in the innermost few pc region of Arp 299-A, as well as to detect recently exploded core-collapse supernovae. We used the European VLBI Network (EVN) to image the 1.7 and 5.0GHz compact radio emission of the parsec-scale structure in the nucleus of Arp 299-A with milliarcsecond resolution. Our EVN observations show that one of the compact VLBI sources, A1, previously detected at 5.0GHz, has a flat spectrum between 1.7 and 5.0GHz and is the brightest source at both frequencies. Our 1.7GHz EVN image shows also diffuse, low-surface brightness emission extending westwards from A1 and displays a prominent core-jet structure. The morphology, radio luminosity, spectral index and ratio of radio-to-X-ray emission of the A1-A5 region is consistent with a low-luminosity AGN (LLAGN), and rules out the possibility that it is a chain of young radio supernovae (RSNe) and supernova remnants (SNRs). We therefore conclude that A1-A5 is the long-sought AGN in Arp 299-A. This finding may suggest that both starburst and AGN are frequently associated phenomena in mergers.

Abstract Copyright:

Journal keyword(s): galaxies: starburst - Galaxy: nucleus - radio continuum: stars - galaxies: individual: Arp 299 - radio continuum: stars - radiation mechanisms: non-thermal

Nomenclature: Fig. 1, Table 1: [PRA2009] A1a (Nos A1b-A1c).

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ICRF J092703.0+390220 Sy1 09 27 03.0138528936 +39 02 20.850343332   17.17 17.00 16.486   ~ 964 1
2 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4214 3
3 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5632 6
4 6C 112519+594222 QSO 11 28 13.3411091832 +59 25 14.801674224   19.78 19.56 19.33   ~ 74 1
5 IC 694 G 11 28 27.312 +58 34 42.29   18.2       ~ 246 2
6 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 942 4
7 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 625 4
8 [PRA2009] A3 SNR 11 28 33.5942 +58 33 46.560           ~ 4 0
9 [PRA2009] A5 SR? 11 28 33.6176 +58 33 46.693           ~ 3 0
10 [PRA2009] A1c Rad 11 28 33.6183 +58 33 46.695           ~ 1 0
11 [PRA2009] A1b Rad 11 28 33.6190 +58 33 46.699           ~ 1 0
12 [PRA2009] A1 SNR 11 28 33.6199 +58 33 46.699           ~ 3 0
13 [PRA2009] A0 SN* 11 28 33.6212 +58 33 46.707           ~ 4 0
14 [PRA2009] A2 SNR 11 28 33.6219 +58 33 46.655           ~ 4 0
15 [PRA2009] A4 SNR 11 28 33.6501 +58 33 46.537           ~ 4 0
16 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2844 4
17 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1569 2
18 SN 2000ft SN* 23 03 15.45 +08 52 26.5           SNII 37 1
19 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 2002 3

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2022.09.26-07:47:29

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