2011A&A...526A...8M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:13:18

2011A&A...526A...8M - Astronomy and Astrophysics, volume 526A, 8-8 (2011/2-1)

The radio properties of infrared-faint radio sources.

MIDDELBERG E., NORRIS R.P., HALES C.A., SEYMOUR N., JOHNSTON-HOLLITT M., HUYNH M.T., LENC E. and MAO M.Y.

Abstract (from CDS):

Infrared-faint radio sources (IFRS) are objects that have flux densities of several mJy at 1.4GHz, but that are invisible at 3.6µm when using sensitive Spitzer observations with µJy sensitivities. Their nature is unclear and difficult to investigate since they are only visible in the radio. High-resolution radio images and comprehensive spectral coverage can yield constraints on the emission mechanisms of IFRS and can give hints to similarities with known objects. We imaged a sample of 17 IFRS at 4.8GHz and 8.6GHz with the Australia Telescope Compact Array to determine the structures on arcsecond scales. We added radio data from other observing projects and from the literature to obtain broad-band radio spectra. We find that the sources in our sample are either resolved out at the higher frequencies or are compact at resolutions of a few arcsec, which implies that they are smaller than a typical galaxy. The spectra of IFRS are remarkably steep, with a median spectral index of -1.4 and a prominent lack of spectral indices larger than -0.7. We also find that, given the IR non-detections, the ratio of 1.4GHz flux density to 3.6µm flux density is very high, and this puts them into the same regime as high-redshift radio galaxies. The evidence that IFRS are predominantly high-redshift sources driven by active galactic nuclei (AGN) is strong, even though not all IFRS may be caused by the same phenomenon. Compared to the rare and painstakingly collected high-redshift radio galaxies, IFRS appear to be much more abundant, but less luminous, AGN-driven galaxies at similar cosmological distances.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: high-redshift

CDS comments: Table 1 : objects ES NNN are [MNC2008] CNNN in SIMBAD.

Simbad objects: 33

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Number of rows : 33

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 ICRF J002442.9-420203 G 00 24 42.98993 -42 02 03.9507   22       ~ 59 0
2 ATELAIS J002905.22-433403.9 Rad 00 29 05.229 -43 34 03.94           ~ 6 0
3 ATELAIS J003138.63-435220.8 Rad 00 31 38.60 -43 52 20.9           ~ 8 0
4 ATELAIS J003207.44-443957.8 Rad 00 32 07.444 -44 39 57.81           ~ 4 0
5 ATELAIS J003211.09-433321.6 Rad 00 32 11.10 -43 33 21.2   19.13   18.79   ~ 3 0
6 ATELAIS J003215.98-433337.9 Rad 00 32 15.989 -43 33 37.92           ~ 2 0
7 ATELAIS J003322.76-435915.3 Rad 00 33 22.766 -43 59 15.37           ~ 4 0
8 ATELAIS J003411.59-435817.0 Rad 00 34 11.56 -43 58 17.1           ~ 10 0
9 ELAIS S1 reg 00 34 44 -43 28.2           ~ 155 0
10 ATELAIS J003705.54-440733.6 Rad 00 37 05.543 -44 07 33.67           ~ 5 0
11 ATELAIS J003844.72-431914.5 Rad 00 38 44.723 -43 19 14.58           ~ 4 0
12 ATELAIS J003907.93-433205.8 Rad 00 39 07.934 -43 32 05.83           ~ 5 0
13 QSO B0237-2322 QSO 02 40 08.1742481040 -23 09 15.727160394   16.78 16.63     ~ 473 0
14 [NAA2006] S114 Rad 03 27 59.89 -27 55 54.7           ~ 5 0
15 [NAA2006] S164 Rad 03 29 00.20 -27 37 45.7           ~ 5 0
16 [NAA2006] S194 Rad 03 29 28.59 -28 36 18.8           ~ 5 0
17 [NAA2006] S215 Rad 03 29 50.02 -27 31 52.6           ~ 5 0
18 [NAA2006] S241 Rad 03 30 10.22 -28 26 53.0           ~ 5 0
19 [NAA2006] S283 Rad 03 30 48.69 -27 44 45.3           ~ 4 0
20 [NAA2006] S415 AGN 03 32 13.08 -27 43 51.0           ~ 20 0
21 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1812 1
22 [NAA2006] S446 Rad 03 32 31.67 -28 04 35.6           ~ 16 0
23 SWIRE J033300.99-284716.6 IR 03 33 01.0 -28 47 17           ~ 1 0
24 [NAA2006] S487 Rad 03 33 01.19 -28 47 20.7           ~ 3 0
25 [NAA2006] S506 Rad 03 33 11.49 -28 03 19.0           ~ 10 0
26 ATCDFS J033330.20-283511.1 Rad 03 33 30.20 -28 35 11.1           ~ 6 0
27 [NAA2006] S703 Rad 03 35 31.03 -27 27 02.2           ~ 4 0
28 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5336 6
29 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5320 1
30 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1781 3
31 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2683 4
32 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 954 1
33 ICRF J235509.4+495008 Sy2 23 55 09.45814510 +49 50 08.3395036   21.101   18.400   ~ 247 1

    Equat.    Gal    SGal    Ecl

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2020.07.14-18:13:18

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