2012A&A...542L..24B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST15:36:20

2012A&A...542L..24B - Astronomy and Astrophysics, volume 542, L24-24 (2012/6-1)

Rapid variability of the compact radio sources in Arp 220. Evidence for a population of microblazars ?

BATEJAT F., CONWAY J.E., RUSHTON A., PARRA R., DIAMOND P.J. and LONSDALE C.J.

Abstract (from CDS):

The two nuclei of the starburst galaxy Arp220 contain multiple compact radio sources previously identified as radio supernovae or supernova remnants. In order to search for an embedded radio AGN, or other possible exotic objects, we have carried out a programme of VLBI monitoring at 6cm over three epochs each separated by four months. Combining the new data with existing data at 6cm and 18cm (spanning 4 and 12 years respectively) we are able to characterise source flux density variability on a range of timescales. Additionally we analyse the variability of sources in shape and position. We detect rapid (<4 months) variability in three sources (W7, W26, and W29). These sources show possible superluminal motion (>4c) of jet-like features near rapidly varying almost stationary components. These enigmatic sources might be associated with an AGN or a highly beamed microquasar (i.e. microblazar). Other hypotheses include that the apparent variability is intrinsic and is produced by neutron star powered central components within a supernova remnant, by a sequence of several supernovae within super star clusters, or is extrinsic and is produced by Galactic interstellar scintillation of very compact non-varying objects. A microquasar/microblazar origin seems to be the best explanation for the nature of the variable sources in Arp220.

Abstract Copyright:

Journal keyword(s): galaxies: nuclei - galaxies: starburst - galaxies: individual: Arp220 - radio continuum: stars - X-rays: binaries

CDS comments: Cluster W3 in NGC 7252 = [WSL93] 3

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5331 6
2 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 883 4
3 [PRA2009] A27 Rad 11 28 33.6221 +58 33 46.692           ~ 4 0
4 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1824 1
5 [LDT2006] W29 Rad 15 34 57.2212 +23 30 11.445           ~ 2 0
6 [LDT2006] W26 Rad 15 34 57.2223 +23 30 11.435           ~ 2 0
7 [SLL98] Arp 220 NW 9 Rad 15 34 57.223 +23 30 11.33           ~ 4 0
8 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2679 4
9 [SLL98] Arp 220 NW 7 SNR 15 34 57.2240 +23 30 11.546           ~ 9 0
10 [LDT2006] W7 Rad 15 34 57.2362 +23 30 11.547           ~ 2 0
11 [SLL98] Arp 220 NW 2 Rad 15 34 57.237 +23 30 11.45           ~ 4 0
12 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1021 0
13 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2281 0
14 [WSL93] 3 GlC 22 20 43.878 -24 40 37.87     17.86     ~ 49 0
15 NGC 7252 IG 22 20 44.7751096408 -24 40 41.905677809 12.26 12.46 12.06 11.57   ~ 662 1

    Equat.    Gal    SGal    Ecl

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2020.07.02-15:36:20

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