2005A&A...440...93K


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET16:15:37

2005A&A...440...93K - Astronomy and Astrophysics, volume 440, 93-105 (2005/9-2)

FIRST-based survey of Compact Steep Spectrum sources. II. MERLIN and VLA observations of medium-sized symmetric objects.

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

Abstract (from CDS):

A new sample of candidate Compact Steep Spectrum (CSS) sources that are much weaker than the CSS source prototypes has been selected from the VLA FIRST catalogue. MERLIN ``snapshot'' observations of the sources at 5GHz indicate that six of them have an FRII-like morphology, but are not edge-brightened as is normal for Medium-sized Symmetric Objects (MSOs) and FRIIs. Further observations of these six sources with the VLA at 4.9GHz and MERLIN at 1.7GHz, as well as subsequent full-track observations with MERLIN at 5GHz of what appeared to be the two sources of greatest interest are presented. The results are discussed with reference to the established evolutionary model of CSS sources being young but in which not all of them evolve to become old objects with extended radio structures. A lack of stable fuelling in some of them may result in an early transition to a so-called coasting phase so that they fade away instead of growing to become large-scale objects. It is possible that one of the six sources (1542+323) could be labelled as a prematurely ``dying'' MSO or a ``fader''.

Abstract Copyright:

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

Simbad objects: 9

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Number of rows : 9

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 IC 2476 LIN 09 27 52.824 +29 59 08.70   14.5       ~ 83 0
2 NVSS J101251+403903 Rad 10 12 51.8 +40 39 04           ~ 6 1
3 4C 32.27A Rad 11 28 02.5 +32 30 47   20       ~ 17 1
4 4C 32.40 Rad 12 39 09.1 +32 30 27     18.5     ~ 18 1
5 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3618 1
6 NVSS J133626+413113 Rad 13 36 26.4 +41 31 13           ~ 8 1
7 QSO B1404+286 BLL 14 07 00.3933203928 +28 27 14.695133019   16.13 15.35 10.29   ~ 657 2
8 4C 32.49 Rad 15 44 48.4 +32 08 45           ~ 13 0
9 NVSS J172516+403641 Rad 17 25 16.3 +40 36 41           ~ 4 1

    Equat.    Gal    SGal    Ecl

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2019.11.14-16:15:37

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