2006A&A...449..985M


Query : 2006A&A...449..985M

2006A&A...449..985M - Astronomy and Astrophysics, volume 449, 985-996 (2006/4-3)

FIRST-based survey of compact steep spectrum sources. III. MERLIN and VLBI observations of subarcsecond-scale objects.

MARECKI A., KUNERT-BAJRASZEWSKA M. and SPENCER R.E.

Abstract (from CDS):

According to a generally accepted paradigm, small intrinsic sizes of Compact Steep Spectrum (CSS) radio sources are a direct consequence of their youth, but in later stages of their evolution they are believed to become large-scale sources. However, this notion was established mainly for strong CSS sources. In this series of papers we test this paradigm on 60 weaker objects selected from the VLA FIRST survey. They have 5-GHz flux densities in the range 150<S5GHz<550mJy and steep spectra in the range 0.365≤ν≤5GHz. The present paper is focused on sources that fulfill the above criteria and have angular sizes in the range ∼0.2"-1". Observations of 19 such sources were obtained using MERLIN in ``snapshot'' mode at 5GHz. They are presented along with 1.7-GHz VLBA and 5-GHz EVN follow-up snapshot observations made for the majority of them. For one of the sources in this subsample, 1123+340, a full-track 5-GHz EVN observation was also carried out. This study provides an important element to the standard theory of CSS sources, namely that in a number of them the activity of their host galaxies probably switched off quite recently and their further growth has been stopped because of that. In the case of 1123+340, the relic of a compact ``dead source'' is particularly well preserved by the presence of intracluster medium of the putative cluster of galaxies surrounding it. The observed overabundance of compact sources can readily be explained in the framework of the scenario of ``premature'' cessation of the activity of the host galaxy nucleus. It could also explain the relatively low radio flux densities of many such sources and, in a few cases, their peculiar, asymmetric morphologies. We propose a new interpretation of such asymmetries based on the light-travel time argument.

Abstract Copyright:

Journal keyword(s): radio continuum: galaxies - galaxies: active - galaxies: evolution

Nomenclature: Table 6: [MKS2006b] HHMM+DDd A, [MKS2006b] HHMM+DDd WN, N=51.

Simbad objects: 24

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Number of rows : 24
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 J000053.0+405401 G 00 00 53.0814204 +40 54 01.803088     21.4     ~ 46 1
2 3C 186 QSO 07 44 17.4720658920 +37 53 17.250697320   17.5 18.14 17.2   ~ 300 1
3 NVSS J074805+290322 Rad 07 48 05.3 +29 03 23           ~ 3 1
4 4C 31.31 G 07 50 12.32967 +31 19 47.5575           ~ 14 1
5 NVSS J081449+355349 Rad 08 14 49.1 +35 53 50           ~ 7 1
6 4C 29.32 QSO 08 56 01.2281175480 +28 58 35.444537832   19.43 19.13     ~ 46 1
7 6C 090206+414045 Q? 09 05 22.2 +41 28 39   19.5       ~ 15 1
8 4C 32.28 Rad 09 25 32.7 +31 59 53       21.50   ~ 11 1
9 4C 33.26 G 11 26 23.67 +33 45 26.6           ~ 27 1
10 NVSS J123454+291744 Rad 12 34 54.4 +29 17 44           ~ 8 1
11 QSO J1244+4048 QSO 12 44 49.1866960536 +40 48 06.168076920   19.0 19.0     ~ 70 1
12 4C 36.21 Rad 12 44 49.69489 +36 09 25.6624     19     ~ 19 1
13 7C 125100.90+305252.00 QSO 12 53 25.7278197648 +30 36 35.184324168   20.64 20.30     ~ 17 1
14 4C 38.37 QSO 13 45 36.9420854112 +38 23 12.500014308     18.5     ~ 85 1
15 4C 35.32 QSO 14 03 19.3132924944 +35 08 13.228917720           ~ 42 2
16 NGC 5419 BiC 14 03 38.7225244848 -33 58 41.881842120   11.77 11.33 10.21   ~ 180 2
17 87GB 144102.4+405726 G 14 42 59.355 +40 44 28.72           ~ 14 1
18 SDSS J160335.17+380642.9 Rad 16 03 38 +38 06.9           ~ 2 0
19 GB6 B1602+3229 Rad 16 04 13.50 +32 21 06.0           ~ 2 1
20 4C 37.46 QSO 16 21 11.2759546848 +37 46 04.839440412   20.47 19.65 18.85   ~ 44 1
21 4C 39.46 QSO 16 34 02.9529956304 +39 00 00.585862308   19.17 18.82     ~ 72 1
22 6C 165641+391056 G 16 58 22.2 +39 06 26           ~ 6 1
23 NVSS J171119+301918 Rad 17 11 19.9 +30 19 18           ~ 13 1
24 NVSS J171930+312848 Rad 17 19 30.1 +31 28 48           ~ 6 1

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2022.05.22-01:30:29

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