2015A&A...573A.137L


Query : 2015A&A...573A.137L

2015A&A...573A.137L - Astronomy and Astrophysics, volume 573A, 137-137 (2015/1-1)

Compton thick AGN in the XMM-COSMOS survey.

LANZUISI G., RANALLI P., GEORGANTOPOULOS I., GEORGAKAKIS A., DELVECCHIO I., AKYLAS T., BERTA S., BONGIORNO A., BRUSA M., CAPPELLUTI N., CIVANO F., COMASTRI A., GILLI R., GRUPPIONI C., HASINGER G., IWASAWA K., KOEKEMOER A., LUSSO E., MARCHESI S., MAINIERI V., MERLONI A., MIGNOLI M., PICONCELLI E., POZZI F., ROSARIO D.J., SALVATO M., SILVERMAN J., TRAKHTENBROT B., VIGNALI C. and ZAMORANI G.

Abstract (from CDS):

Heavily obscured, Compton thick (CT, NH>1024cm–2) active galactic nuclei (AGN) may represent an important phase in AGN/galaxy co-evolution and are expected to provide a significant contribution to the cosmic X-ray background at its peak. However, unambiguously identifying CT AGN beyond the local Universe is a challenging task even in the deepest X-ray surveys, and given the expected low spatial density of these sources in the 2-10keV band, large area surveys are needed to collect sizable samples. Through direct X-ray spectra analysis, we selected 39 heavily obscured AGN (NH>3x1023cm–2) at bright X-ray fluxes (F2–10>10–14erg/s/cm2) in the 2deg2 XMM-COSMOS survey. After selecting CT AGN based on the fit of a simple absorbed two power law model to the shallow XMM-Newton data, the presence of bona fide CT AGN was confirmed in 80% of the sources using deeper Chandra data and more complex models. The final sample comprises ten CT AGN (six of them also have a detected Fe Kα line with EW∼1keV), spanning a wide range of redshifts (z∼0.1-2.5) and luminosity (L2–10∼1043.5-1045erg/s) and is complemented by 29 heavily obscured AGN spanning the same redshift and luminosity range. We collected the rich multi-wavelength information available for all these sources, in order to study the distribution of super massive black hole and host properties, such as black hole mass (MBH), Eddington ratio (λEdd), stellar mass (M*), specific star formation rate (sSFR) in comparison with a sample of unobscured AGN. We find that highly obscured sources tend to have significantly smaller MBH and higher λEdd with respect to unobscured sources, while a weaker evolution in M* is observed. The sSFR of highly obscured sources is consistent with the one observed in the main sequence of star forming galaxies, at all redshifts. We also present and briefly discuss optical spectra, broadband spectral energy distribution (SED) and morphology for the sample of ten CT AGN. Both the optical spectra and SED agree with the classification as highly obscured sources: all the available optical spectra are dominated by the stellar component of the host galaxy, and to reproduce the broadband SED, a highly obscured torus component is needed for all the CT sources. Exploiting the high resolution Hubble-ACS images available, we are able to show that these highly obscured sources have a significantly larger merger fraction with respect to other X-ray selected samples of AGN. Finally we discuss the implications of our findings in the context of AGN/galaxy co-evolutionary models, and compare our results with the predictions of X-ray background synthesis models.

Abstract Copyright:

Journal keyword(s): galaxies: nuclei - galaxies: Seyfert - quasars: general - X-rays: galaxies

Simbad objects: 44

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Number of rows : 44
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1888 1
2 2MASS J09134545+4056282 Sy2 09 13 45.4949162350 +40 56 28.214305677   19.69 19.21     ~ 238 2
3 ACS-GC 20161481 AGN 09 58 06.98 +02 33 14.5   24.908 24.634   23.227 ~ 11 0
4 ACS-GC 20313755 AGN 09 58 09.31 +02 43 17.3         25.456 ~ 12 0
5 ACS-GC 20101064 AGN 09 58 17.37 +02 15 45.8 23.88 23.287 22.529   20.411 ~ 24 0
6 ACS-GC 20159068 AGN 09 58 28.95 +02 36 51.5 26.01 25.491 24.769   22.546 ~ 15 0
7 ACS-GC 20311199 AGN 09 58 29.063 +02 46 51.30   25.347 24.919   21.50 ~ 13 0
8 COSMOS2015 212499 AGN 09 58 35.28 +01 36 09.2   22.713 23.589     ~ 14 0
9 ACS-GC 20156070 AGN 09 58 58.03 +02 35 06.7 25.72 25.20 24.88 24.57 23.80 ~ 16 0
10 ACS-GC 20157270 AGN 09 58 58.26 +02 32 25.1   23.345 23.266   22.396 ~ 11 0
11 ACS-GC 20020443 AGN 09 59 13.10 +01 45 29.3 25.50 24.251 24.339   24.027 ~ 15 0
12 ACS-GC 20155724 AGN 09 59 14.39 +02 34 34.2   24.379 24.057   22.658 ~ 12 0
13 ACS-GC 20070598 AGN 09 59 15.00 +02 06 39.6   25.095 24.867   23.560 ~ 15 0
14 ACS-GC 20127165 AGN 09 59 22.189 +02 19 27.73   26.345 25.252   22.796 ~ 15 0
15 SDSS J095932.49+021037.5 AGN 09 59 32.498 +02 10 37.64 23.71 23.17 22.01 21.449 20.528 ~ 23 0
16 COSMOS2015 589008 AGN 09 59 35.28 +02 11 46.8           ~ 14 0
17 ACS-GC 20125049 AGN 09 59 36.53 +02 19 37.7   23.953 24.041   23.449 ~ 17 0
18 ACS-GC 20257695 AGN 10 00 00.61 +02 15 31.1   25.596 25.580   24.826 ~ 30 0
19 ACS-GC 20179736 AGN 10 00 03.70 +02 39 57.1 24.24 24.22 23.70 23.35 22.48 ~ 18 0
20 COSMOS2015 748043 AGN 10 00 06.542 +02 26 05.00           ~ 12 0
21 COSMOS2015 419216 AGN 10 00 11.30 +01 55 53.1           ~ 12 0
22 COSMOS2015 705530 AGN 10 00 12.55 +02 22 09.6           ~ 13 0
23 COSMOS2015 597570 QSO 10 00 13.7237776938 +02 12 21.277724145   20.029 19.317   18.331 ~ 28 0
24 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2319 0
25 ACS-GC 20014154 AGN 10 00 30.732 +01 47 11.06 24.25 24.08 23.73 23.51 23.01 ~ 21 0
26 ACS-GC 20150246 AGN 10 00 31.76 +02 31 23.9 24.94 24.83 24.44 24.15 23.59 ~ 18 0
27 ACS-GC 20145920 AGN 10 00 54.503 +02 32 15.44   24.635 24.473   23.780 ~ 19 0
28 COSMOS2015 969883 AGN 10 00 55.294 +02 46 40.94           ~ 9 0
29 ACS-GC 20062817 QSO 10 00 57.473 +01 59 01.36 24.28 23.38 22.16 21.394 20.758 ~ 23 0
30 COSMOS2015 854904 AGN 10 01 01.64 +02 35 42.3           ~ 9 0
31 ACS-GC 20036328 AGN 10 01 01.941 +01 48 00.37   23.338 22.777   20.539 ~ 23 0
32 COSMOS2015 601946 QSO 10 01 11.68 +02 12 50.7   25.240 24.907   23.032 ~ 19 0
33 ACS-GC 20010159 AGN 10 01 14.971 +01 43 48.31 22.92 22.332 21.82   20.03 ~ 32 0
34 ACS-GC 20113854 AGN 10 01 23.448 +02 23 27.59 23.91 23.72 23.11 22.87 22.127 ~ 22 0
35 COSMOS2015 460385 AGN 10 01 35.32 +01 59 52.5 25.94 25.30 24.66 24.46 24.12 ~ 12 0
36 COSMOS2015 499053 AGN 10 01 41.186 +02 03 33.83           ~ 9 0
37 2MASX J10014194+0203577 LIN 10 01 41.984 +02 03 58.15 20.88 19.56 18.54 17.427 16.11 ~ 29 0
38 ACS-GC 20085461 AGN 10 01 44.498 +02 08 34.00   23.750 23.173   21.49 ~ 20 0
39 ACS-GC 20056478 AGN 10 02 09.53 +02 03 39.0   25.528 25.338   23.763 ~ 10 0
40 COSMOS 822302 AGN 10 02 11.638 +01 52 18.38           ~ 6 0
41 2XMM J100228.7+024901 AGN 10 02 28.696 +02 49 01.58   20.663 19.619   17.861 ~ 15 0
42 SDSS J100229.89+023225.2 AGN 10 02 29.892 +02 32 25.23   22.283 21.176   18.964 ~ 20 0
43 ACS-GC 20000120 AGN 10 02 41.78 +01 35 50.1 24.09 23.388 22.858   21.010 ~ 15 0
44 [ICS2009] 272822 AGN 10 02 48.87 +01 38 55.2 23.34 22.775 22.536   21.050 ~ 22 0

    Equat.    Gal    SGal    Ecl

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2021.07.25-15:49:29

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