2007A&A...470...97L


Query : 2007A&A...470...97L

2007A&A...470...97L - Astronomy and Astrophysics, volume 470, 97-104 (2007/7-4)

VLBI observations of nineteen GHz-peaked-spectrum radio sources at 1.6 GHz.

LIU X., CUI L., LUO W.-F., SHI W.-Z. and SONG H.-G.

Abstract (from CDS):

Aim. and Methods. We present the results of VLBI observations of nineteen GHz-peaked-spectrum (GPS) radio sources at 1.6 GHz. Of them, 15 sources are selected from the Parkes half-jansky (PHJ) sample (Snellen et al., 2002MNRAS.337..981S), and 4 others are from our previous observation list. We aimed at imaging the structure of GPS sources, searching for compact symmetric objects (CSOs) and studying the absorption for the convex radio spectra of GPS sources.
Results. We obtained total-intensity 1.6 GHz VLBI images of 17 sources for the first time. Of them, 80% show a mini-double-lobe radio structure, indicating that they are CSOs or candidates, and their host AGNs could be edge-on to us. This result suggests that there is a high incidence of mini double-lobe sources (or CSOs) in the PHJ sample. The sources J0323+0534, J1135-0021, J1352+0232, J2058+0540, J2123-0112, and J2325-0344 are classified as CSOs with measured redshift, showing double-lobe structure with sizes of <1kpc. Three sources J1057+0012, J1600-0037, and J1753+2750 are considered as core-jet sources according to their morphologies and flux variability.

Abstract Copyright:

Journal keyword(s): galaxies: nuclei - quasars: general - radio continuum: galaxies - galaxies: active

Nomenclature: Figs 1-18, Table 2: [LCL2007] JHHMM+DDMM A, [LCL2007] BHHMM+DDd A, N=25.18.

Simbad objects: 20

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Number of rows : 20
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 87GB 020808.1+040519 AG? 02 10 44.5096 +04 19 35.000           ~ 15 1
2 4C 05.14 rG 03 23 20.2607119272 +05 34 11.891999568     19     ~ 75 1
3 4C -02.17 QSO 04 33 54.9 -02 29 56     19.5     ~ 27 1
4 87GB 091049.4+150652 G 09 13 35.0 +14 54 20           ~ 12 1
5 87GB 091433.4+112607 G 09 17 16.4 +11 13 37           ~ 23 1
6 ICRF J105715.7+001203 G 10 57 15.7674222 +00 12 03.575400           ~ 24 1
7 87GB 110710.4+110001 G 11 09 46.1 +10 43 44           ~ 22 1
8 4C -00.45 AGN 11 35 13.0 -00 21 19           ~ 24 1
9 [VV2006] J120321.9+041419 QSO 12 03 21.9376393920 +04 14 19.081466664   19.22 18.89     ~ 60 1
10 DW 1349+02 AGN 13 52 30.7 +02 32 47     19     ~ 25 1
11 4C 11.46 AGN 13 52 56.4 +11 07 08   20.0       ~ 19 1
12 QSO B1404+286 BLL 14 07 00.3941769384 +28 27 14.692128372   16.13 15.35 10.29   ~ 724 2
13 PKS 1557-00 Rad 16 00 01.0136 -00 37 22.590           ~ 17 0
14 4C 02.43 AGN 16 48 31.8 +02 42 46   17       ~ 20 1
15 87GB 175104.0+275120 G 17 53 01.34610 +27 50 59.0160           ~ 20 1
16 NVSS J182632+270808 Rad 18 26 32.10 +27 08 08.0           ~ 14 0
17 4C 05.78 G 20 58 26 +05 40.7           ~ 13 0
18 PMN J2123-0112 G 21 23 39.1 -01 12 35           ~ 33 1
19 Gopal 2323+790 G 23 25 03.0 +79 17 15           ~ 11 1
20 AT20G J232510-034446 AGN 23 25 10.258047 -03 44 46.71563           ~ 29 0

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2022.05.25-03:15:52

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