2014A&A...567A..76B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:32:19

2014A&A...567A..76B - Astronomy and Astrophysics, volume 567A, 76-76 (2014/7-1)

The radio-loud AGN population at z> 1 in the COSMOS field. I. selection and spectral energy distributions.

BALDI R.D., CAPETTI A., CHIABERGE M. and CELOTTI A.

Abstract (from CDS):

We select a sample of radio galaxies at high redshifts (z>1) in the COSMOS field by cross-matching optical and infrared (IR) images with the FIRST radio data. The aim of this study is to explore the high-z radio-loud (RL) active galactic nuclei (AGN) population at much lower luminosities than the classical samples of distant radio sources, which are similar to those of the local population of radio galaxies. Precisely, we extended a previous analysis focused on low-luminosity radio galaxies. The wide multiwavelength coverage provided by the COSMOS survey allows us to derive their spectral energy distributions (SEDs). We model them with our own developed technique 2SPD that includes old and young stellar populations and dust emission. When added to those previously selected, we obtain a sample of 74 RL AGN. The SED modeling returns several important quantities associated with the AGN and host properties. The resulting photometric redshifts range from z∼0.7 to 3. The sample mostly includes compact radio sources but also 21 FR IIs sources; the radio power distribution of the sample covers ∼1031.5-1034.3erg/s/Hz, thus straddling the local FR I/FR II break. The inferred range of stellar mass of the hosts is ∼1010-1011.5M. The SEDs are dominated by the contribution from an old stellar population with an age of ∼1-3Gyr for most of the sources. However, UV and mid-IR (MIR) excesses are observed for half of the sample. The dust luminosities inferred from the MIR excesses are in the range, Ldust∼1043-1045.5erg/s, which are associated with temperatures approximately of 350-1200K. Estimates of the UV component yield values of ∼1041.5-1045.5erg/s at 2000Å. The UV emission is significantly correlated with both IR and radio luminosities; the former being the stronger link. However, the origin of UV and dust emission, whether it is produced by the AGN of by star formation, is still unclear. Our results show that this RLAGN population at high redshifts displays a wide variety of properties. Low-power radio galaxies, which are associated with UV- and IR-faint hosts are generally similar to red massive galaxies of the local FR Is. At the opposite side of the radio luminosity distribution, large MIR and UV excesses are observed in objects consistent with quasar-like AGN, as also proved by their high dust temperatures, which are more similar to local FR IIs.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: high-redshift - galaxies: jets - galaxies: nuclei - galaxies: photometry

VizieR on-line data: <Available at CDS (J/A+A/567/A76): table1.dat table2.dat table3.dat table5.dat tablea1.dat tablea2.dat>

CDS comments: Table 1 Host IDs not in SIMBAD. Tables 4 and 5 : objects COSMOS-FR I NN ([CTC2009] NNN) not in SIMBAD (coordinates not provided by the authors).

Simbad objects: 57

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Number of rows : 57

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 COSMOSVLADP J095738.38+023837.7 Rad 09 57 38.3850 +02 38 37.770           ~ 4 0
2 COSMOS 1061583 AGN 09 57 41.11 +01 51 22.5   25.552 24.783     ~ 10 0
3 COSMOSVLA J095742.30+020426.0 Rad 09 57 42.305 +02 04 26.07           ~ 5 0
4 ACS-GC 20133119 G 09 57 56.52 +02 27 17.2 25.70 25.04 23.08 22.26 20.925 ~ 7 0
5 NVSS J095758+015832 Rad 09 57 58.71 +01 58 32.5           ~ 1 0
6 COSMOSVLA J095803.21+021357.7 AG? 09 58 03.215 +02 13 57.75         24.754 ~ 9 0
7 [VV2006] J095821.7+024628 QSO 09 58 21.6547 +02 46 28.153   18.6 19.57 19.0 19.08 ~ 44 0
8 COSMOSVLA J095822.30+024721.3 Rad 09 58 22.302 +02 47 21.33           ~ 4 0
9 COSMOSVLA J095822.93+022619.8 rG 09 58 22.936 +02 26 19.80           ~ 5 1
10 COSMOSVLA J095826.95+023711.7 Rad 09 58 26.957 +02 37 11.74           ~ 4 0
11 ACS-GC 20245488 G 09 58 35.45 +02 05 43.7   26.813 26.567 25.58 24.36 ~ 8 0
12 COSMOSVLA J095835.71+025328.9 Rad 09 58 35.713 +02 53 28.92           ~ 4 0
13 COSMOSVLA J095837.11+023549.0 Rad 09 58 37.112 +02 35 49.07           ~ 3 0
14 COSMOSVLA J095838.01+013217.1 Rad 09 58 38.013 +01 32 17.12           ~ 5 0
15 COSMOS2015 210704 AGN 09 58 39.25 +01 35 57.7   24.700 24.664     ~ 8 0
16 [ICS2009] 1726047 AGN 09 58 56.195 +02 41 27.85 22.387 22.209 21.84 21.495 20.779 ~ 25 0
17 ACS-GC 20182435 BiC 09 59 01.521 +02 47 40.93 24.05 22.48 21.067 20.037 19.119 ~ 12 0
18 [VV2006] J095908.3+024309 QSO 09 59 08.3184 +02 43 09.639   19.28 18.94   18.975 ~ 45 0
19 COSMOSVLA J095908.87+013606.6 Rad 09 59 08.877 +01 36 06.61           ~ 5 0
20 ACS-GC 20197960 G 09 59 08.92 +02 48 12.8 27.32 26.173 25.00 24.02 22.87 ~ 6 0
21 NMBS C26748 rG 09 59 27.253 +02 37 29.47 27.86 26.07 24.73 23.59 22.33 ~ 9 0
22 COSMOSVLA J095949.80+015650.7 Rad 09 59 49.808 +01 56 50.75           ~ 4 0
23 COSMOSVLA J095959.16+014837.8 Rad 09 59 59.161 +01 48 37.89           ~ 4 0
24 [SCS2004] J100006.175+024000.34 Rad 10 00 06.174 +02 40 00.56           ~ 5 0
25 ACS-GC 20180239 G 10 00 07.27 +02 40 49.9 26.96 26.448 25.759 25.04 23.78 ~ 6 0
26 COSMOSVLA J100007.90+024315.4 Rad 10 00 07.903 +02 43 15.41           ~ 4 0
27 [CCC2015] DSFG J100016.57+022638.4 rG 10 00 16.575 +02 26 38.47           ~ 9 0
28 COSMOSVLA J100028.31+013507.8 Rad 10 00 28.312 +01 35 07.89           ~ 3 0
29 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2069 0
30 [BMM2014] 766333 AGN 10 00 46.923 +02 07 26.49 23.675 23.59 23.01 22.70 22.067 ~ 18 0
31 COSMOS2015 350495 rG 10 00 49.589 +01 49 23.71 24.68 23.46 21.96 21.043 20.175 ~ 18 0
32 [SCS2004] J100058.069+015128.89 Rad 10 00 58.052 +01 51 29.04           ~ 6 0
33 ACS-GC 20237765 AG? 10 01 01.267 +02 01 18.06         24.895 ~ 7 0
34 [SCS2004] J100102.384+020528.57 Rad 10 01 02.388 +02 05 29.14           ~ 4 0
35 COSMOSVLA J100109.28+021721.7 Rad 10 01 09.287 +02 17 21.76           ~ 4 0
36 2XMM J100114.1+015444 AGN 10 01 14.14 +01 54 44.2   24.276 24.181   23.288 ~ 17 0
37 2XMM J100114.8+020208 QSO 10 01 14.857 +02 02 08.47   22.037 21.585   20.71 ~ 35 0
38 COSMOS2015 842703 QSO 10 01 20.050 +02 34 43.82   25.113 24.241     ~ 21 0
39 COSMOS 3017710 AGN 10 01 24.06 +02 49 36.7   24.463 23.225   20.494 ~ 13 0
40 COSMOSVLA J100129.35+014027.1 Rad 10 01 29.355 +01 40 27.12           ~ 5 0
41 ACS-GC 20032757 AGN 10 01 37.78 +01 48 11.8 25.12 24.65 23.52 22.79 21.633 ~ 13 0
42 ACS-GC 20032392 G 10 01 40.13 +01 51 29.6 26.31 25.998 25.34 24.31 23.02 ~ 6 0
43 COSMOS 2982809 G 10 01 53.77 +02 49 54.2   25.534 24.818   22.897 ~ 6 0
44 ACS-GC 20169466 G 10 01 59.83 +02 39 05.0 26.17 25.66 24.09 23.47 22.31 ~ 8 0
45 ACS-GC 20082421 AGN 10 02 01.143 +02 13 27.23 26.00 25.25 23.49 22.61 21.288 ~ 14 0
46 ACS-GC 20140719 AGN 10 02 12.08 +02 31 34.9   25.922 25.589   23.567 ~ 13 0
47 2XMM J100217.8+015835 AGN 10 02 17.973 +01 58 36.18   22.146 22.187   21.444 ~ 18 0
48 ACS-GC 20028035 AG? 10 02 18.032 +01 55 55.73         21.334 ~ 6 0
49 COSMOSVLA J100230.11+020912.4 Rad 10 02 30.117 +02 09 12.45           ~ 4 0
50 COSMOSVLA J100243.20+015942.1 Rad 10 02 43.206 +01 59 42.17           ~ 3 0
51 COSMOSVLA J100245.39+024519.8 Rad 10 02 45.396 +02 45 19.88           ~ 3 0
52 NVSS J100250+013017 Rad 10 02 50.84 +01 30 17.2           ~ 1 0
53 COSMOSVLA J100251.11+024248.5 Rad 10 02 51.112 +02 42 48.53           ~ 3 0
54 COSMOSVLA J100252.88+015549.7 Rad 10 02 52.885 +01 55 49.77           ~ 5 0
55 COSMOS2015 333779 G 10 03 03.68 +01 47 36.2   25.874 25.212   22.342 ~ 7 0
56 COSMOSVLADP J100320.60+021608.9 Rad 10 03 20.6080 +02 16 08.970           ~ 2 0
57 COSMOSVLADP J100331.82+014901.4 Rad 10 03 31.8260 +01 49 01.440           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-18:32:20

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