2012A&A...542A..16R

Query : 2012A&A...542A..16R

2012A&A...542A..16R - Astronomy and Astrophysics, volume 542A16-16 (2012/6-1)

X-ray properties of radio-selected star forming galaxies in the Chandra-COSMOS survey.

RANALLI P., COMASTRI A., ZAMORANI G., CAPPELLUTI N., CIVANO F., GEORGANTOPOULOS I., GILLI R., SCHINNERER E., SMOLCIC V. and VIGNALI C.

Abstract (from CDS):

X-ray surveys contain sizable numbers of star forming galaxies, beyond the AGN which usually make the majority of detections. Many methods to separate the two populations are used in the literature, based on X-ray and multiwavelength properties. We aim at a detailed test of the classification schemes and to study the X-ray properties of the resulting samples. We build on a sample of galaxies selected at 1.4 GHz in the VLA-COSMOS survey, classified by Smolcic et al. (2008ApJS..177...14S) according to their optical colours and observed with Chandra. A similarly selected control sample of AGN is also used for comparison. We review some X-ray based classification criteria and check how they affect the sample composition. The efficiency of the classification scheme devised by Smolcic et al. (2008ApJS..177...14S) is such that ∼30% of composite/misclassified objects are expected because of the higher X-ray brightness of AGN with respect to galaxies. The latter fraction is actually 50% in the X-ray detected sources, while it is expected to be much lower among X-ray undetected sources. Indeed, the analysis of the stacked spectrum of undetected sources shows, consistently, strongly different properties between the AGN and galaxy samples. X-ray based selection criteria are then used to refine both samples. The radio/X-ray luminosity correlation for star forming galaxies is found to hold with the same X-ray/radio ratio valid for nearby galaxies. Some evolution of the ratio may be possible for sources at high redshift or high luminosity, tough it is likely explained by a bias arising from the radio selection. Finally, we discuss the X-ray number counts of star forming galaxies from the VLA- and C-COSMOS surveys according to different selection criteria, and compare them to the similar determination from the Chandra deep fields. The classification scheme proposed here may find application in future works and surveys.

Abstract Copyright: ∼

Journal keyword(s): X-rays: galaxies - radio continuum: galaxies - galaxies: fundamental parameters - galaxies: star formation - galaxies: active - galaxies: high-redshift

VizieR on-line data: <Available at CDS (J/A+A/542/A16): table2.dat table3.dat>

Simbad objects: 120

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Number of rows : 120
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 Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
2 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
3 ACS-GC 20074147 rG 09 58 33.866 +02 06 27.48   24.956 24.703   22.699 ~ 20 0
4 ACS-GC 20261055 rG 09 58 35.717 +02 13 57.95   24.477 23.408   20.877 ~ 24 0
5 ACS-GC 20101989 rG 09 58 35.911 +02 12 33.25   24.740 23.884   21.255 ~ 31 0
6 2dFGRS TGN420Z196 rG 09 58 44.7288669096 +02 02 49.482049740 19.84 18.80 18.14 16.913 16.41 ~ 34 0
7 ACS-GC 20101857 rG 09 58 44.857 +02 11 00.26 23.418 22.90 22.09 21.371 20.645 ~ 27 0
8 SDSS J095846.02+014905.1 rG 09 58 46.026 +01 49 05.46   23.892 22.691   19.980 ~ 35 0
9 ACS-GC 20100160 rG 09 58 47.001 +02 15 52.22 24.48 23.72 22.53 21.705 20.866 ~ 30 0
10 [ICS2009] 824885 QSO 09 58 57.038 +02 03 54.72 23.21 22.5421 21.5551   19.729 ~ 35 0
11 ACS-GC 20072723 rG 09 58 57.208 +01 58 43.55 25.38 24.58 23.25 22.37 21.503 ~ 28 0
12 2XMM J095858.5+021459 Sy1 09 58 58.5334227912 +02 14 59.123267484 20.49 19.39 18.69 17.381 17.01 ~ 58 0
13 COSMOSVLA J095903.81+020316.8 QSO 09 59 03.801 +02 03 16.65 23.405 23.39 22.84 22.52 22.35 ~ 19 0
14 2MASS J09591024+0207321 Sy2 09 59 10.3133295984 +02 07 32.243334564 21.59 20.73 20.00   18.496 ~ 50 0
15 2MASS J09591565+0208567 Sy2 09 59 15.6348159480 +02 08 56.601636108 20.538 19.878 18.931 18.670 18.253 ~ 21 0
16 SDSS J095916.52+020944.3 rG 09 59 16.520 +02 09 44.46 23.148 21.948 20.423 19.702 18.991 ~ 23 0
17 ACS-GC 20127259 Sy2 09 59 20.152 +02 18 31.51   24.570 24.331   21.487 ~ 25 0
18 COSMOS2015 445878 rG 09 59 20.980 +01 58 18.68 26.11 26.04 24.98 24.46 23.21 ~ 17 0
19 ACS-GC 20125413 rG 09 59 21.376 +02 24 27.92 25.56 24.87 22.99 22.17 20.871 ~ 26 0
20 COSMOS2015 631161 rG 09 59 21.859 +02 15 17.59 23.228 22.65 21.453 21.034 20.478 ~ 27 0
21 ACS-GC 20127165 rG 09 59 22.211 +02 19 27.66   26.345 25.252   22.796 ~ 19 0
22 ACS-GC 20125661 rG 09 59 24.0310 +02 27 08.100 24.63 24.12 23.02 22.40 21.415 ~ 34 0
23 [ICS2009] 1046759 QSO 09 59 25.625 +02 16 23.34   23.314 22.724   20.411 ~ 32 0
24 ACS-GC 20098220 QSO 09 59 26.844 +02 10 23.19 24.45 24.16 23.05 22.48 21.465 ~ 29 0
25 SDSS J095926.88+015341.3 Sy2 09 59 26.886 +01 53 41.33 22.54 21.3563 20.1684   18.95 ~ 41 0
26 ACS-GC 20019717 QSO 09 59 27.267 +01 46 34.94   22.638 21.654   19.72 ~ 20 0
27 ACS-GC 20071015 rG 09 59 28.158 +02 06 22.83 24.72 24.57 23.87 23.31 22.323 ~ 25 0
28 COSMOS2015 304293 rG 09 59 28.187 +01 44 51.68   22.743 22.081     ~ 16 0
29 ACS-GC 20043765 rG 09 59 31.531 +01 53 06.78 25.80 24.90 23.57 22.64 21.746 ~ 19 0
30 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
31 ACS-GC 20070981 Sy2 09 59 34.453 +02 06 27.68   23.4209 22.5391   21.324 ~ 30 0
32 ACS-GC 20041640 rG 09 59 34.661 +01 56 51.14 23.78 23.49 22.69 22.26 21.470 ~ 31 0
33 SDSS J095934.68+021228.7 rG 09 59 34.706 +02 12 28.99 21.62 21.10 20.41   19.42 ~ 24 0
34 ACS-GC 20122427 rG 09 59 37.427 +02 23 47.25   23.640 23.129   21.125 ~ 31 0
35 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
36 ACS-GC 20093757 rG 09 59 41.064 +02 15 01.43   23.365 22.894   21.224 ~ 27 0
37 ACS-GC 20152050 rG 09 59 42.284 +02 33 37.68 25.77 25.07 23.63 22.83 21.753 ~ 22 0
38 COSMOS2015 816527 rG 09 59 42.720 +02 32 06.34 24.17 23.60 22.34 21.521 20.585 ~ 24 0
39 2MASS J09594518+0234390 Sy2 09 59 45.1911039384 +02 34 39.250936344 20.58 19.43 18.61   16.936 ~ 37 0
40 COSMOS2015 421547 rG 09 59 47.611 +01 55 55.99 22.123 21.649 20.456 20.086 19.615 ~ 20 0
41 ACS-GC 20094003 rG 09 59 48.823 +02 12 45.12 24.43 23.51 22.16 21.320 20.501 ~ 21 0
42 ACS-GC 20042925 rG 09 59 50.276 +01 48 05.27 24.95 24.62 23.46 22.72 21.640 ~ 32 0
43 COSMOS2015 908883 rG 09 59 53.910 +02 40 43.31   23.468 22.580     ~ 19 0
44 ACS-GC 20152775 rG 09 59 54.690 +02 30 15.19 25.53 25.34 24.61 24.02 23.03 ~ 25 0
45 ACS-GC 20016020 Sy2 09 59 56.049 +01 47 27.73 24.07 23.00 21.742 21.140 20.671 ~ 27 0
46 ACS-GC 20042715 rG 09 59 58.291 +01 51 28.26   23.9496 22.7018   21.208 ~ 31 0
47 ACS-GC 20069298 rG 10 00 02.069 +02 01 32.72 25.02 24.93 24.25 23.58 22.89 ~ 29 0
48 ACS-GC 20256980 rG 10 00 04.529 +02 08 51.99   22.945 22.591   20.90 ~ 30 0
49 COSMOS2015 480738 rG 10 00 05.310 +02 01 35.36 21.724 21.302 20.179 19.864 19.441 ~ 25 0
50 SDSS J100005.35+023059.6 rG 10 00 05.372 +02 30 59.57 25.15 24.54 23.08 22.31 21.133 ~ 42 0
51 ACS-GC 20040478 Sy2 10 00 05.997 +01 54 53.14 22.562 22.48 21.93 21.651 20.916 ~ 39 0
52 ACS-GC 20067230 Sy2 10 00 08.440 +02 02 47.28 23.173 22.58 21.2283 20.884 20.438 ~ 25 0
53 2MASS J10001014+0241412 QSO 10 00 10.1532191568 +02 41 41.387338248   20.842 19.583   17.797 ~ 30 0
54 ZFOURGE COSMOS 6336 QSO 10 00 11.906 +02 14 25.17   24.039 23.129   20.817 ~ 30 0
55 2XMM J100012.1+014439 QSO 10 00 12.087 +01 44 39.91 22.61 22.063 22.111   21.74 ~ 35 0
56 ACS-GC 20094880 rG 10 00 13.583 +02 12 30.86 21.541 20.683 19.675 19.466 19.035 ~ 28 0
57 ACS-GC 20094653 Sy2 10 00 13.7238326496 +02 12 21.278230308   20.029 19.317   18.331 ~ 34 0
58 SDSS J100013.92+022249.5 rG 10 00 13.929 +02 22 49.58         18.553 ~ 41 0
59 ACS-GC 20093025 Sy2 10 00 14.200 +02 13 11.80   23.482 23.257   21.329 ~ 33 0
60 ACS-GC 20067693 rG 10 00 14.277 +02 06 44.08 24.73 24.352 24.034   22.802 ~ 23 0
61 2MASS J10001605+0212375 Sy2 10 00 16.06 +02 12 37.5 21.611 20.836 19.714 19.357 18.758 ~ 49 0
62 SDSS J100019.34+022325.1 QSO 10 00 19.329 +02 23 24.94   22.141 20.887   18.76 ~ 33 0
63 SDSS J100021.43+021758.5 QSO 10 00 21.423 +02 17 58.47 24.55 23.96 22.69 22.10 21.348 ~ 23 0
64 2MASS J10002178+0200000 LIN 10 00 21.7798361880 +01 59 59.910267372   20.346 19.097   17.168 ~ 25 0
65 2MASS J10002295+0213126 Sy2 10 00 22.9436315880 +02 13 12.483919020 19.21 18.71 18.52 18.17 18.02 ~ 39 0
66 ACS-GC 20066258 rG 10 00 23.822 +02 01 05.49 21.979 21.535 20.373 19.930 19.450 ~ 21 0
67 SDSS J100027.75+015703.9 EmG 10 00 27.762 +01 57 04.05   20.70     20.37 ~ 15 0
68 COSMOS2015 431884 AGN 10 00 27.76226 +01 57 06.2550   23.810 23.677     ~ 8 0
69 ACS-GC 20118592 rG 10 00 28.550 +02 27 25.92 21.555 21.064 20.009 19.753 19.149 ~ 25 0
70 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
71 ACS-GC 20014154 Sy2 10 00 30.721 +01 47 11.41 24.25 24.08 23.73 23.51 23.01 ~ 26 0
72 SDSS J100036.06+022830.4 Sy2 10 00 36.058 +02 28 30.46 23.50 22.834 22.283   20.536 ~ 63 0
73 CANDELS COSMOS F160W J100037.65+022948.9 Sy2 10 00 37.657 +02 29 49.09 25.09 24.72 23.61 22.90 21.847 ~ 26 0
74 SDSS J100043.13+020637.2 Sy1 10 00 43.1299846800 +02 06 37.403465580 20.25 19.86 19.37   18.79 ~ 125 0
75 NVSS J100043+014608 rG 10 00 43.192 +01 46 07.89   21.423 20.246   17.717 ~ 39 1
76 ACS-GC 20117620 Sy2 10 00 43.543 +02 25 24.31   24.496 23.672   21.388 ~ 32 0
77 COSMOS2015 696669 QSO 10 00 45.103 +02 21 10.57 23.00 22.199 21.32   20.145 ~ 27 0
78 NVSS J100047+015911 rG 10 00 47.594 +01 59 10.66         18.76 ~ 29 0
79 SDSS J100049.58+014923.7 rG 10 00 49.589 +01 49 23.71 24.68 23.46 21.96 21.043 20.175 ~ 27 0
80 ACS-GC 20014592 rG 10 00 49.66 +01 40 49.0   25.006 24.757   22.804 ~ 26 0
81 COSMOS2015 585823 rG 10 00 51.343 +02 11 17.76 23.789 23.28 22.33 21.824 20.884 ~ 25 0
82 ACS-GC 20089821 rG 10 00 54.751 +02 16 11.27 23.223 22.85 22.20 21.684 21.009 ~ 32 0
83 SDSS J100054.79+014602.3 Sy2 10 00 54.7960 +01 46 02.530 24.05 22.981 21.70   20.09 ~ 35 0
84 ACS-GC 20220937 QSO 10 00 56.156 +01 56 42.47 21.826 21.423 20.350 19.950 19.415 ~ 25 0
85 ACS-GC 20062817 QSO 10 00 57.473 +01 59 01.36 24.28 23.38 22.16 21.394 20.758 ~ 28 0
86 2XMM J100058.1+014559 QSO 10 00 58.209 +01 45 58.96   23.4485 22.2355   20.304 ~ 36 0
87 2MASS J10005870+0211383 EmG 10 00 58.6989831120 +02 11 39.454955016 20.83 19.68 18.97 17.404 17.07 ~ 24 0
88 COSMOS2015 446464 rG 10 00 59.700 +01 58 20.28 23.320 22.87 22.05 21.467 20.656 ~ 28 0
89 ACS-GC 20087445 rG 10 01 00.055 +02 12 52.50 23.620 22.91 21.690 20.897 20.187 ~ 31 0
90 2MASS J10010071+0216411 Sy2 10 01 00.6663762552 +02 16 41.443376088 20.32 19.46 18.94   17.518 ~ 30 0
91 ACS-GC 20036328 Sy2 10 01 01.952 +01 48 00.31   23.338 22.777   20.539 ~ 30 0
92 ACS-GC 20060892 rG 10 01 03.942 +02 02 59.48 25.67 25.35 24.13 23.17 21.943 ~ 27 0
93 2MASS J10010423+0233077 rG 10 01 04.2516942888 +02 33 07.392207276 21.907 20.987 19.476 19.075 18.540 ~ 24 0
94 ACS-GC 20088971 Sy2 10 01 07.32 +02 11 00.7   25.528 25.165   23.132 ~ 22 0
95 [ICS2009] 754881 QSO 10 01 10.7590 +02 02 04.270   24.495 24.010   21.372 ~ 29 0
96 ACS-GC 20087454 Sy2 10 01 11.700 +02 12 50.60   25.240 24.907   23.032 ~ 24 0
97 SDSS J100114.85+020208.4 Sy1 10 01 14.857 +02 02 08.47   22.0742 21.2343   20.71 ~ 48 0
98 ACS-GC 20010159 Sy2 10 01 14.971 +01 43 48.31 22.92 22.332 21.82   20.03 ~ 38 0
99 LEDA 1210282 rG 10 01 19.5758051280 +01 55 16.450834080 20.791 19.879 18.777 18.407 17.775 ~ 24 0
100 2XMM J100129.3+013633 Sy2 10 01 29.4222404328 +01 36 33.785358768 19.74 18.60 17.95   16.418 ~ 38 0
101 LEDA 1221949 Sy2 10 01 29.9526609000 +02 17 05.112732156 20.24 19.20 18.60   16.31 ~ 30 0
102 SDSS J100131.15+022924.8 rG 10 01 31.1467723056 +02 29 24.676799892 22.564 21.578 20.161 19.555 18.909 ~ 39 0
103 SDSS J100136.46+022642.1 rG 10 01 36.4625676768 +02 26 42.114714396   19.250 18.239   16.368 ~ 28 0
104 SDSS J100139.75+022548.7 rG 10 01 39.7582624824 +02 25 48.620442360         15.527 ~ 39 0
105 ACS-GC 20056888 QSO 10 01 40.400 +02 05 06.52 22.47 21.6901 20.7358   19.99 ~ 37 0
106 SDSS J100141.04+015904.0 rG 10 01 41.05 +01 59 04.1 22.702 21.651 20.128 19.542 18.916 ~ 23 0
107 SDSS J100141.33+021031.1 Sy1 10 01 41.340 +02 10 31.32   21.4017 20.726   20.541 ~ 36 0
108 2MASX J10014194+0203577 LIN 10 01 41.984 +02 03 58.15 20.88 19.56 18.54 17.427 16.11 ~ 36 0
109 SDSS J100147.27+015258.0 rG 10 01 47.309 +01 52 58.18   24.171 22.723   19.719 ~ 27 0
110 2MASS J10014735+0203141 rG 10 01 47.3509417152 +02 03 14.124069252 22.461 21.265 19.645 18.998 18.354 ~ 27 0
111 COSMOS2015 541953 rG 10 01 51.218 +02 07 15.06 23.320 22.61 21.291 20.691 20.044 ~ 22 0
112 ACS-GC 20030674 Sy2 10 01 52.233 +01 56 08.58 24.88 24.449 23.930   21.810 ~ 36 0
113 COSMOS2015 632279 QSO 10 01 57.920 +02 15 18.93 23.79 23.47 22.53 21.976 20.914 ~ 18 0
114 ACS-GC 20055713 rG 10 01 59.1610 +02 05 21.370   23.882 23.585   21.800 ~ 23 0
115 ACS-GC 20058647 Sy2 10 02 02.561 +02 01 45.14 23.100 22.93 22.30 21.982 21.051 ~ 45 0
116 COSMOS2015 562400 Sy2 10 02 03.098 +02 09 07.18 22.240 21.945 21.284 20.850 20.434 ~ 29 0
117 ACS-GC 20108753 rG 10 02 23.0270 +02 20 09.840 25.40 24.960 24.623   22.522 ~ 28 0
118 ACS-GC 20107100 rG 10 02 25.3380 +02 26 14.100   25.451 24.850   22.703 ~ 21 0
119 SDSS J100233.35+022751.6 rG 10 02 33.372 +02 27 51.89 24.58 24.08 22.74 22.16 21.072 ~ 30 0
120 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 920 2

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