2023A&A...673A..67G

Query : 2023A&A...673A..67G

2023A&A...673A..67G - Astronomy and Astrophysics, volume 673A67 (2023/5-1)

Comparing the host galaxy ages of X-ray selected AGN in COSMOS Obscured AGN are associated with older galaxies.

GEORGANTOPOULOS I., POULIASIS E., MOUNTRICHAS G., VAN DER WEL A., MARCHESI S. and LANZUISI G.

Abstract (from CDS):

We explore the properties of the host galaxies of X-ray selected AGN in the COSMOS field using the Chandra Legacy sample and the LEGA-C survey VLT optical spectra. Our main goal is to compare the relative ages of the host galaxies of the obscured and unobscured AGN by means of the calcium break Dn(4000) and the Hδ Balmer line. The host galaxy ages are examined in conjunction with other properties such as the galaxy stellar mass, and star-formation rate as well as the AGN Eddington ratio. Our sample consists of 50 unobscured or mildly obscured (NH < 1023 cm–2) and 23 heavily obscured AGN (NH > 1023 cm–2) in the redshift range z = 0.6 - 1. We take specific caution to create control samples in order to match the exact luminosity and redshift distributions for the obscured and unobscured AGN. The majority of unobscured AGN appear to live in young galaxies in contrast to the obscured AGN which appear to live in galaxies located between the young and old galaxy populations. This finding may be in contrast to those evolutionary AGN unification models which postulate that the AGN begin their life in a heavy obscuration phase. The host galaxies of the obscured AGN have significantly lower levels of specific star-formation. At the same time the obscured AGN have lower Eddington ratios indicating a link between the star-formation and the black hole accretion. We find that the distribution of the stellar masses of the host galaxies of obscured AGN is skewed towards higher stellar masses in agreement with previous findings. Our results on the relative age of obscured AGN are valid when we match our obscured and unobscured AGN samples according to the stellar mass of their host galaxies. All the above results become less conspicuous when a lower column density (log NH(cm–2) = 21.5 or 22) is used to separate the obscured and unobscured AGN populations.

Abstract Copyright: © The Authors 2023

Journal keyword(s): galaxies: nuclei - quasars: supermassive black holes - X-rays: galaxies - galaxies: active

Simbad objects: 75

goto Full paper

goto View the references in ADS

Number of rows : 75
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 COSMOS2015 918850 AGN 09 57 39.99 +02 41 37.2   23.803 23.251     ~ 14 0
3 ACS-GC 20133789 AGN 09 57 56.87 +02 19 35.2   26.134 25.225   22.618 ~ 13 0
4 SDSS J095805.10+020445.6 AGN 09 58 05.103 +02 04 45.69   22.870 22.661   20.609 ~ 26 0
5 ACS-GC 20051293 rG 09 58 06.68 +01 49 01.9 25.52 24.93 23.49 22.74 21.513 ~ 16 0
6 ACS-GC 20132941 AGN 09 58 07.98 +02 27 29.7 25.76 25.28 23.95 23.19 21.913 ~ 13 0
7 ACS-GC 20104631 AGN 09 58 09.38 +02 10 57.4 23.78 23.52 22.81 22.49 21.701 ~ 12 0
8 ACS-GC 20101298 AGN 09 58 28.224 +02 12 55.97 23.307 22.99 22.28 21.800 21.063 ~ 17 0
9 ACS-GC 20159068 rG 09 58 28.95 +02 36 51.5 26.01 25.491 24.769   22.350 ~ 21 0
10 ACS-GC 20130933 AGN 09 58 34.58 +02 21 33.3   25.420 24.812   22.186 ~ 18 0
11 ACS-GC 20101989 rG 09 58 35.911 +02 12 33.25   24.740 23.884   21.255 ~ 31 0
12 ACS-GC 20159655 rG 09 58 38.40 +02 27 54.3   26.278 24.866   21.406 ~ 19 0
13 COSMOS2015 697690 AGN 09 58 42.37 +02 21 12.2   22.700 22.465   20.509 ~ 11 0
14 SDSS J095846.02+014905.1 rG 09 58 46.026 +01 49 05.46   23.892 22.691   19.980 ~ 35 0
15 ACS-GC 20073668 AGN 09 58 48.42 +02 07 18.6   24.509 23.810   21.262 ~ 21 0
16 ACS-GC 20129860 AGN 09 58 49.35 +02 27 37.2   23.174     21.117 ~ 22 0
17 [ICS2009] 824885 QSO 09 58 57.038 +02 03 54.72 23.21 22.5421 21.5551   19.729 ~ 35 0
18 ACS-GC 20126490 AGN 09 59 08.807 +02 22 41.93 25.24 24.97 23.94 23.24 22.103 ~ 19 0
19 ACS-GC 20128265 rG 09 59 10.50 +02 19 38.0 24.20 24.15 23.44 23.00 21.971 ~ 25 0
20 ACS-GC 20155747 AGN 09 59 13.50 +02 34 20.7 25.35 25.19 24.25 23.49 22.38 ~ 17 0
21 ACS-GC 20045360 AGN 09 59 16.93 +01 48 42.3 22.700 22.38 21.5217 21.404 20.678 ~ 28 0
22 ACS-GC 20096359 AGN 09 59 17.27 +02 15 16.7 22.655 22.53 21.5885 21.816 21.243 ~ 31 0
23 COSMOS2015 706550 AGN 09 59 22.024 +02 22 01.35 25.50 25.31 24.28 23.61 22.48 ~ 18 0
24 COSMOS2015 464763 AGN 09 59 22.09 +02 00 06.0 25.49 25.07 23.71 23.08 21.935 ~ 17 0
25 COSMOS2015 838928 AGN 09 59 23.38 +02 34 08.7   26.030 25.312   21.048 ~ 12 0
26 ACS-GC 20125661 rG 09 59 24.0310 +02 27 08.100 24.63 24.12 23.02 22.40 21.415 ~ 34 0
27 [ICS2009] 1046759 QSO 09 59 25.625 +02 16 23.34   23.314 22.724   20.411 ~ 32 0
28 COSMOS2015 606757 AGN 09 59 28.370 +02 13 07.18 25.60 25.08 23.66 22.92 21.663 ~ 21 0
29 COSMOS2015 806087 AGN 09 59 30.418 +02 31 07.51 25.22 24.81 23.40 22.67 21.494 ~ 21 0
30 COSMOS2015 864722 AGN 09 59 32.19 +02 36 35.7 23.348 23.01 22.25 21.829 21.006 ~ 21 0
31 SDSS J095932.49+021037.5 rG 09 59 32.498 +02 10 37.64 23.71 23.17 22.01 21.449 20.528 ~ 32 0
32 SDSS J095939.76+023117.1 rG 09 59 39.769 +02 31 16.84 25.60 24.75 22.85 22.060 20.742 ~ 35 0
33 ACS-GC 20153793 AGN 09 59 40.858 +02 30 51.21 25.02 24.86 23.4773 22.82 21.753 ~ 28 0
34 ACS-GC 20093757 rG 09 59 41.064 +02 15 01.43   23.365 22.894   21.224 ~ 27 0
35 ACS-GC 20042907 AGN 09 59 45.82 +01 48 22.5   24.732 24.096   21.634 ~ 18 0
36 ACS-GC 20042925 rG 09 59 50.276 +01 48 05.27 24.95 24.62 23.46 22.72 21.640 ~ 32 0
37 ACS-GC 20124377 rG 09 59 52.81 +02 20 07.4   23.600 23.269   21.370 ~ 18 0
38 COSMOS2015 769059 rG 09 59 57.75 +02 27 51.6 23.180 22.90 22.19 21.962 21.135 ~ 21 0
39 ACS-GC 20042715 rG 09 59 58.291 +01 51 28.26   23.9496 22.7018   21.208 ~ 31 0
40 ACS-GC 20151038 rG 10 00 06.42 +02 33 43.3 24.58 23.99 22.632 22.20 21.049 ~ 34 0
41 ZFOURGE COSMOS 6336 QSO 10 00 11.906 +02 14 25.17   24.039 23.129   20.817 ~ 30 0
42 SDSS J100013.33+022657.2 rG 10 00 13.335 +02 26 57.21   24.036 23.075   20.328 ~ 35 0
43 ACS-GC 20092931 AGN 10 00 13.42 +02 14 00.5 23.33 22.915 22.585   20.828 ~ 38 0
44 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
45 COSMOS2015 873499 rG 10 00 31.15 +02 37 29.0 25.34 24.93 23.86 23.20 22.076 ~ 19 0
46 ACS-GC 20150496 rG 10 00 33.23 +02 31 45.7 26.16 26.13 24.68 23.92 22.69 ~ 21 0
47 ACS-GC 20063849 AGN 10 00 35.70 +02 03 38.1 24.18 23.76 22.82 22.25 21.292 ~ 26 0
48 SDSS J100036.06+022830.4 Sy2 10 00 36.058 +02 28 30.46 23.50 22.834 22.283   20.536 ~ 63 0
49 ACS-GC 20146828 rG 10 00 47.77 +02 35 51.5   25.476 24.035   21.371 ~ 27 0
50 2XMM J100058.1+014559 QSO 10 00 58.209 +01 45 58.96   23.4485 22.2355   20.304 ~ 36 0
51 COSMOS2015 446464 rG 10 00 59.700 +01 58 20.28 23.320 22.87 22.05 21.467 20.656 ~ 28 0
52 COSMOS2015 473612 AGN 10 01 00.143 +02 00 54.18 24.05 23.60 22.49 21.700 20.830 ~ 21 0
53 ACS-GC 20060892 rG 10 01 03.942 +02 02 59.48 25.67 25.35 24.13 23.17 21.943 ~ 27 0
54 ACS-GC 20062797 AGN 10 01 05.90 +01 59 19.8   24.683 23.939   21.527 ~ 28 0
55 [ICS2009] 754881 QSO 10 01 10.7590 +02 02 04.270   24.495 24.010   21.372 ~ 29 0
56 ACS-GC 20011257 AGN 10 01 11.953 +01 47 01.65 25.06 24.19 23.04 22.36 21.252 ~ 27 0
57 ACS-GC 20061708 AGN 10 01 17.754 +02 00 14.01   23.525 22.867   21.513 ~ 23 0
58 ACS-GC 20088083 AGN 10 01 17.813 +02 10 35.40 25.73 25.36 24.16 23.47 22.301 ~ 19 0
59 ACS-GC 20142843 AGN 10 01 18.90 +02 36 19.6 24.54 24.38 23.39 23.00 22.018 ~ 20 0
60 ACS-GC 20035414 rG 10 01 27.48 +01 48 38.6 24.84 24.410 24.045   22.079 ~ 22 0
61 COSMOS2015 694999 AGN 10 01 30.55 +02 21 05.6 24.98 24.69 23.45 22.82 21.718 ~ 18 0
62 ACS-GC 20032567 AGN 10 01 35.336 +01 50 05.40   25.296 24.435   21.516 ~ 20 0
63 ACS-GC 20234846 Sy2 10 01 40.35 +01 58 36.3 23.068 22.89 22.23 21.973 21.141 ~ 37 0
64 ACS-GC 20056914 AGN 10 01 42.52 +02 04 59.1   23.7829 22.6224   21.725 ~ 25 0
65 ACS-GC 20168553 AGN 10 01 46.86 +02 43 09.1 24.75 24.41 23.42 22.78 21.598 ~ 14 0
66 ACS-GC 20168472 AGN 10 01 50.18 +02 44 00.2 25.27 24.57 23.27 22.61 21.349 ~ 15 0
67 ACS-GC 20142017 AGN 10 01 54.489 +02 29 38.74 23.82 23.40 22.50 21.786 20.896 ~ 22 0
68 ACS-GC 20056344 AGN 10 01 58.32 +02 06 56.1 24.60 24.38 23.49 22.88 21.747 ~ 18 0
69 SDSS J100201.70+023912.6 AGN 10 02 01.717 +02 39 12.83 23.267 22.96 22.22 21.882 20.959 ~ 16 0
70 ACS-GC 20111802 AGN 10 02 09.093 +02 18 37.77   23.2049 22.4406   20.843 ~ 34 0
71 ACS-GC 20081472 rG 10 02 17.53 +02 12 12.5   22.857 22.422   20.322 ~ 31 0
72 ACS-GC 20137831 AGN 10 02 32.15 +02 29 25.7   22.5763 21.9476   20.430 ~ 22 0
73 ACS-GC 20108013 AGN 10 02 40.14 +02 20 47.8 24.52 24.37 23.46 23.02 21.852 ~ 19 0
74 COSMOS2015 613569 AGN 10 02 41.48 +02 13 52.8 24.85 24.65 23.91 23.63 22.68 ~ 11 0
75 COSMOS2015 635671 AGN 10 02 41.74 +02 15 45.6 25.72 25.25 23.94 23.17 22.014 ~ 11 0

To bookmark this query, right click on this link: simbad:objects in 2023A&A...673A..67G and select 'bookmark this link' or equivalent in the popup menu