2008MNRAS.386.1729T

Query : 2008MNRAS.386.1729T

2008MNRAS.386.1729T - Mon. Not. R. Astron. Soc., 386, 1729-1738 (2008/May-3)

Multifrequency spectral analysis of extragalactic radio sources in the 33-GHz VSA catalogue: sources with flattening and upturn spectrum.

TUCCI M., RUBINO-MARTIN J.A., REBOLO R., GENOVA-SANTOS R., WATSON R.A., BATTYE R.A., CLEARY K.A., DAVIES R.D., DAVIS R.J., GRAINGE K., HOBSON M., SAUNDERS R.D.E., SCAIFE A. and SCOTT P.F.

Abstract (from CDS):

We present an analysis of the spectral properties of the extragalactic radio sources in the nearly complete Very Small Array (VSA) sample at 33GHz. Data from different surveys are used to study source spectra between 1.4 and 33GHz. We find that, in general, spectra cannot be well described by a single power law in the range of frequencies considered. In particular, most of the VSA sources that are steep between 1.4 and 5GHz, show a spectral flattening at ν > 5GHz. We identify 20 objects (19 per cent of the sample) clearly characterized by an upturn spectrum, i.e. a spectrum falling at low frequencies (ν ≲ 5GHz) and inverted at higher frequencies. Spectra with high-frequency flattening or upturn shape are supposed to occur when the emission from the active galactic nucleus (AGN) compact core begins to dominate over the component from extended lobes. This picture fits well with the AGN unified scheme, for objects observed at intermediate viewing angles of the AGN jet. Finally, we discuss implications that this class of sources can have on future cosmic microwave background observations at high resolution.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): galaxies: active - quasars: general - cosmic microwave background - radio continuum: galaxies

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NVSS J001332+283451 rG 00 13 32.6582318896 +28 34 51.100400346       21.01   ~ 6 1
2 [CTW2005] J0014+2815 Rad 00 14 33.8 +28 15 08           ~ 2 0
3 NVSS J001908+281753 Rad 00 19 08.9 +28 17 56       17.41   ~ 4 0
4 NVSS J002339+292827 rG 00 23 39.63945600 +29 28 27.9414120           ~ 6 1
5 9C J0024+2911 QSO 00 24 34.417 +29 11 26.64       17.44   ~ 10 0
6 [CTW2005] J0024+2724 Rad 00 24 50.5 +27 24 27           ~ 2 0
7 NVSS J031344+271848 Rad 03 13 44.9067 +27 18 47.561           ~ 6 1
8 NVSS J072803+532516 Rad 07 28 03.1638 +53 25 16.951           ~ 6 1
9 NVSS J072823+543118 Rad 07 28 23.7522497352 +54 31 17.968990584           ~ 6 1
10 NVSS J093102+304911 rG 09 31 02.9468035814 +30 49 12.138875092           ~ 5 1
11 NVSS J094411+311517 rG 09 44 11.5184900665 +31 15 18.765247635           ~ 5 1
12 FIRST J094610.9+330906 Rad 09 46 11.00344 +33 09 05.8468           ~ 3 0
13 SDSS J094613.48+305022.2 QSO 09 46 13.48314 +30 50 22.2088           ~ 6 1
14 SDSS J095048.90+320143.4 QSO 09 50 48.9088084296 +32 01 43.447878156   19.98 19.68     ~ 21 1
15 NVSS J121545+515449 Rad 12 15 45.81 +51 54 49.0           ~ 3 0
16 [CTW2005] J1219+5408 Rad 12 19 43.3 +54 08 33           ~ 2 0
17 9C J1221+5429 QSO 12 21 18.2196584496 +54 29 07.495042776           ~ 14 1
18 [CTW2005] J1229+5147 Rad 12 29 22.0 +51 47 07           ~ 2 0
19 [CTW2005] J1240+5334 Rad 12 40 05.5 +53 34 33           ~ 2 0
20 [CTW2005] J1240+5441 Rad 12 40 14.2 +54 41 48           ~ 2 0
21 NVSS J152645+420144 Rad 15 26 45.48 +42 01 44.1       19.10   ~ 8 0
22 NVSS J153327+410719 rG 15 33 27.92591 +41 07 21.0344       19.28   ~ 6 1
23 6C 153740+422722 BLL 15 39 25.6817583408 +42 17 28.148091504   18.59 18.22 18.38   ~ 17 1
24 [CTW2005] J1723+4206 Rad 17 23 25.1 +42 06 10           ~ 2 0
25 NVSS J172832+393517 Rad 17 28 32.0476 +39 35 16.846           ~ 6 1
26 [CTW2005] J1730+4102 Rad 17 30 41.4 +41 02 57           ~ 2 0
27 [CTW2005] J1733+4034 Rad 17 33 07.5 +40 34 28           ~ 2 0
28 7C 173240.70+385949.00 BLL 17 34 20.57853650 +38 57 51.4430945   19.5 19 19.00   ~ 232 1
29 [CTW2005] J1737+3958 Rad 17 37 41.1 +39 58 18           ~ 2 0
30 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2

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