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


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

2012A&A...542A..16R - Astronomy and Astrophysics, volume 542A, 16-16 (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: 119

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Number of rows : 119
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1970 1
2 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5632 6
3 ACS-GC 20074147 AGN 09 58 33.849 +02 06 27.83   24.956 24.703   22.699 ~ 15 0
4 ACS-GC 20261055 AGN 09 58 35.717 +02 13 57.92   24.477 23.408   21.037 ~ 14 0
5 ACS-GC 20101989 AGN 09 58 35.911 +02 12 33.32   24.740 23.884   21.12 ~ 21 0
6 2dFGRS TGN420Z196 AGN 09 58 44.7288669096 +02 02 49.482049740 19.84 18.80 18.14 16.913 16.41 ~ 28 0
7 COSMOS2015 583926 AGN 09 58 44.865 +02 11 00.38 23.418 22.90 22.09 21.371 20.645 ~ 18 0
8 SDSS J095846.03+014905.1 AGN 09 58 46.014 +01 49 05.56   23.892 22.691   20.30 ~ 24 0
9 ACS-GC 20100160 AGN 09 58 47.003 +02 15 52.29 24.48 23.72 22.53 21.705 20.866 ~ 24 0
10 [ICS2009] 824885 QSO 09 58 57.037 +02 03 54.97 23.21 22.760 22.182   20.14 ~ 25 0
11 ACS-GC 20072723 AGN 09 58 57.220 +01 58 43.61 25.38 24.58 23.25 22.37 21.503 ~ 22 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 ~ 50 0
13 COSMOSVLA J095903.81+020316.8 QSO 09 59 03.816 +02 03 16.88 23.405 23.39 22.84 22.52 22.35 ~ 13 0
14 2MASS J09591024+0207321 QSO 09 59 10.3133295984 +02 07 32.243334564 21.59 20.73 20.00   18.496 ~ 42 0
15 2MASS J09591565+0208567 QSO 09 59 15.6348159480 +02 08 56.601636108 20.538 19.878 18.931 18.670 18.253 ~ 18 0
16 SDSS J095916.52+020944.3 AGN 09 59 16.520 +02 09 44.46 23.148 21.948 20.423 19.702 18.991 ~ 19 0
17 COSMOS2015 667434 QSO 09 59 20.178 +02 18 31.34   24.570 24.331   21.487 ~ 19 0
18 COSMOS2015 445878 AGN 09 59 20.980 +01 58 18.68 26.11 26.04 24.98 24.46 23.21 ~ 12 0
19 ACS-GC 20125413 AGN 09 59 21.376 +02 24 27.92 25.56 24.87 22.99 22.17 20.871 ~ 20 0
20 COSMOS2015 631161 AGN 09 59 21.859 +02 15 17.59 23.228 22.65 21.453 21.034 20.478 ~ 24 0
21 ACS-GC 20127165 AGN 09 59 22.189 +02 19 27.73   26.345 25.252   22.796 ~ 15 0
22 ACS-GC 20125661 AGN 09 59 24.0310 +02 27 08.100 24.63 24.12 23.02 22.40 21.415 ~ 23 0
23 [ICS2009] 1046759 QSO 09 59 25.624 +02 16 23.17   23.314 22.724   20.62 ~ 23 0
24 [ICS2009] 1061833 QSO 09 59 26.836 +02 10 23.21 24.45 24.16 23.05 22.48 21.465 ~ 21 0
25 2XMM J095926.9+015342 QSO 09 59 26.886 +01 53 41.33 22.54 21.778 20.87   18.95 ~ 35 0
26 COSMOSVLA J095927.27+014634.8 QSO 09 59 27.272 +01 46 34.80   22.638 21.654   19.72 ~ 16 0
27 ACS-GC 20071015 AGN 09 59 28.147 +02 06 22.92 24.72 24.57 23.87 23.31 22.323 ~ 20 0
28 COSMOS2015 304293 AGN 09 59 28.187 +01 44 51.68   22.743 22.081     ~ 14 0
29 COSMOS2015 390857 AGN 09 59 31.531 +01 53 06.63 25.80 24.90 23.57 22.64 21.746 ~ 14 0
30 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
31 ACS-GC 20070981 AGN 09 59 34.460 +02 06 28.33   23.362 22.912   21.324 ~ 24 0
32 COSMOS2015 430641 AGN 09 59 34.640 +01 56 50.96 23.78 23.49 22.69 22.26 21.470 ~ 26 0
33 SDSS J095934.68+021228.7 AGN 09 59 34.706 +02 12 28.99 21.62 21.10 20.41   19.42 ~ 22 0
34 ACS-GC 20122427 AGN 09 59 37.419 +02 23 47.31   23.640 23.129   21.125 ~ 25 0
35 COSMOS2015 807707 rG 09 59 39.771 +02 31 16.93 25.60 24.75 22.85 22.060 20.742 ~ 23 0
36 ACS-GC 20093757 AGN 09 59 41.063 +02 15 01.32   23.365 22.894   21.244 ~ 19 0
37 ACS-GC 20152050 AGN 09 59 42.284 +02 33 37.68 25.77 25.07 23.63 22.83 21.753 ~ 18 0
38 COSMOS2015 816527 rG 09 59 42.722 +02 32 06.54 24.17 23.60 22.34 21.521 20.585 ~ 18 0
39 2XMM J095945.3+023441 LIN 09 59 45.1911039384 +02 34 39.250936344 20.58 19.43 18.61   16.936 ~ 30 0
40 COSMOS2015 421547 AGN 09 59 47.611 +01 55 55.99 22.123 21.649 20.456 20.086 19.615 ~ 16 0
41 COSMOS2015 603129 rG 09 59 48.823 +02 12 45.12 24.43 23.51 22.16 21.320 20.501 ~ 17 0
42 ACS-GC 20042925 AGN 09 59 50.266 +01 48 05.35 24.95 24.62 23.46 22.72 21.640 ~ 22 0
43 COSMOS2015 908883 AGN 09 59 53.910 +02 40 43.31   23.468 22.580     ~ 14 0
44 ACS-GC 20152775 rG 09 59 54.686 +02 30 15.39 25.53 25.34 24.61 24.02 23.03 ~ 17 0
45 ACS-GC 20016020 AGN 09 59 56.038 +01 47 27.73 24.07 23.00 21.742 21.140 20.671 ~ 23 0
46 ACS-GC 20042715 AGN 09 59 58.268 +01 51 28.18   24.123 23.167   21.22 ~ 23 0
47 ACS-GC 20069298 AGN 10 00 02.062 +02 01 32.69 25.02 24.93 24.25 23.58 22.89 ~ 22 0
48 ACS-GC 20256980 AGN 10 00 04.537 +02 08 52.25   22.945 22.591   20.90 ~ 25 0
49 COSMOS2015 480738 AGN 10 00 05.310 +02 01 35.36 21.724 21.302 20.179 19.864 19.441 ~ 23 0
50 SDSS J100005.35+023059.6 AGN 10 00 05.365 +02 30 59.55 25.15 24.54 23.08 22.31 21.133 ~ 32 0
51 ACS-GC 20040478 AGN 10 00 05.999 +01 54 53.47 22.562 22.48 21.93 21.651 20.916 ~ 29 0
52 COSMOSVLA J100008.43+020247.3 QSO 10 00 08.434 +02 02 47.37 23.173 22.58 21.439 20.884 20.438 ~ 20 0
53 2MASS J10001014+0241412 QSO 10 00 10.1532191568 +02 41 41.387338248   20.842 19.583   17.797 ~ 24 0
54 ZFOURGE COSMOS 6336 QSO 10 00 11.906 +02 14 25.17   24.039 23.129   21.33 ~ 22 0
55 2XMM J100012.1+014439 QSO 10 00 12.087 +01 44 39.91 22.61 22.063 22.111   21.74 ~ 31 0
56 ACS-GC 20094880 AGN 10 00 13.583 +02 12 30.86 21.541 20.683 19.675 19.466 19.035 ~ 24 0
57 COSMOS2015 597570 QSO 10 00 13.7238326496 +02 12 21.278230308   20.029 19.317   18.331 ~ 31 0
58 SDSS J100013.92+022249.5 AGN 10 00 13.929 +02 22 49.58         18.553 ~ 35 0
59 ACS-GC 20093025 QSO 10 00 14.191 +02 13 12.18   23.482 23.257   21.329 ~ 25 0
60 ACS-GC 20067693 AGN 10 00 14.275 +02 06 44.44 24.73 24.352 24.034   22.802 ~ 19 0
61 2MASS J10001605+0212375 AGN 10 00 16.06 +02 12 37.5 21.611 20.836 19.714 19.357 18.758 ~ 43 0
62 SDSS J100019.34+022325.1 QSO 10 00 19.329 +02 23 24.94   22.141 20.887   18.76 ~ 28 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 ~ 18 0
64 SDSS J100021.77+015959.9 LIN 10 00 21.7798361880 +01 59 59.910267372   20.346 19.097   17.168 ~ 21 0
65 2MASS J10002295+0213126 AGN 10 00 22.9436315880 +02 13 12.483919020 19.21 18.71 18.52 18.17 18.02 ~ 34 0
66 ACS-GC 20066258 AGN 10 00 23.822 +02 01 05.49 21.979 21.535 20.373 19.930 19.450 ~ 16 0
67 COSMOS2015 431884 AGN 10 00 27.777 +01 57 04.25   23.810 23.677     ~ 9 0
68 ACS-GC 20118592 AGN 10 00 28.550 +02 27 25.92 21.555 21.064 20.009 19.753 19.149 ~ 20 0
69 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2587 0
70 ACS-GC 20014154 AGN 10 00 30.732 +01 47 11.06 24.25 24.08 23.73 23.51 23.01 ~ 21 0
71 SDSS J100036.05+022830.4 AGN 10 00 36.058 +02 28 30.46 23.50 22.834 22.283   20.51 ~ 51 0
72 COSMOS2015 790527 QSO 10 00 37.657 +02 29 49.09 25.09 24.72 23.61 22.90 21.847 ~ 20 0
73 SDSS J100043.13+020637.2 QSO 10 00 43.1299846800 +02 06 37.403465580 20.25 19.86 19.37   18.79 ~ 110 0
74 SDSS J100043.19+014607.8 AGN 10 00 43.192 +01 46 07.89   21.423 20.246   17.717 ~ 31 0
75 ACS-GC 20117620 AGN 10 00 43.55 +02 25 24.8   24.496 23.672   21.388 ~ 23 0
76 COSMOS2015 696669 QSO 10 00 45.103 +02 21 10.57 23.00 22.199 21.32   20.145 ~ 23 0
77 SDSS J100047.59+015910.6 AGN 10 00 47.594 +01 59 10.66         18.76 ~ 25 0
78 SDSS J100049.58+014923.7 rG 10 00 49.589 +01 49 23.71 24.68 23.46 21.96 21.043 20.175 ~ 23 0
79 ACS-GC 20014592 AGN 10 00 49.66 +01 40 49.0   25.006 24.757   22.804 ~ 19 0
80 COSMOS2015 585823 AGN 10 00 51.343 +02 11 17.76 23.789 23.28 22.33 21.824 20.884 ~ 19 0
81 COSMOS2015 640623 AGN 10 00 54.749 +02 16 11.30 23.223 22.85 22.20 21.684 21.009 ~ 25 0
82 COSMOS2015 317720 QSO 10 00 54.7960 +01 46 02.530 24.05 22.981 21.70   20.09 ~ 30 0
83 COSMOS2015 429011 QSO 10 00 56.166 +01 56 42.79 21.826 21.423 20.350 19.950 19.415 ~ 20 0
84 ACS-GC 20062817 QSO 10 00 57.473 +01 59 01.36 24.28 23.38 22.16 21.394 20.758 ~ 23 0
85 2XMM J100058.1+014559 QSO 10 00 58.209 +01 45 58.96   23.517 22.663   20.63 ~ 24 0
86 2dFGRS TGN420Z069 EmG 10 00 58.6989831120 +02 11 39.454955016 20.83 19.68 18.97 17.404 17.07 ~ 20 0
87 COSMOS2015 446464 AGN 10 00 59.700 +01 58 20.28 23.320 22.87 22.05 21.467 20.656 ~ 20 0
88 ACS-GC 20087445 AGN 10 01 00.055 +02 12 52.50 23.620 22.91 21.690 20.897 20.187 ~ 27 0
89 2MASS J10010071+0216411 QSO 10 01 00.6663762552 +02 16 41.443376088 20.32 19.46 18.94   17.518 ~ 27 0
90 ACS-GC 20036328 AGN 10 01 01.941 +01 48 00.37   23.338 22.777   20.539 ~ 23 0
91 COSMOS2015 495826 AGN 10 01 03.948 +02 02 59.68 25.67 25.35 24.13 23.17 21.943 ~ 18 0
92 COSMOS2015 825433 AGN 10 01 04.2516942888 +02 33 07.392207276 21.907 20.987 19.476 19.075 18.540 ~ 20 0
93 COSMOS2015 581456 QSO 10 01 07.32 +02 11 00.7   25.528 25.165   23.132 ~ 17 0
94 [ICS2009] 754881 QSO 10 01 10.7590 +02 02 04.270   24.495 24.010   21.440 ~ 20 0
95 COSMOS2015 601946 QSO 10 01 11.68 +02 12 50.7   25.240 24.907   23.032 ~ 19 0
96 SDSS J100114.85+020208.4 QSO 10 01 14.857 +02 02 08.47   22.037 21.585   20.71 ~ 40 0
97 ACS-GC 20010159 AGN 10 01 14.971 +01 43 48.31 22.92 22.332 21.82   20.03 ~ 32 0
98 LEDA 1210282 AGN 10 01 19.5758051280 +01 55 16.450834080 20.791 19.879 18.777 18.407 17.775 ~ 20 0
99 2XMM J100129.3+013633 Sy2 10 01 29.4222404328 +01 36 33.785358768 19.74 18.60 17.95   16.418 ~ 32 0
100 2MASS J10012996+0217050 AGN 10 01 29.9526609000 +02 17 05.112732156 20.24 19.20 18.60   16.31 ~ 27 0
101 SDSS J100131.15+022924.8 AGN 10 01 31.1467723056 +02 29 24.676799892 22.564 21.578 20.161 19.555 18.909 ~ 31 0
102 SDSS J100136.46+022642.1 AGN 10 01 36.4625676768 +02 26 42.114714396   19.250 18.239   16.368 ~ 23 0
103 SDSS J100139.75+022548.7 BiC 10 01 39.7582624824 +02 25 48.620442360         15.527 ~ 31 0
104 ACS-GC 20056888 QSO 10 01 40.389 +02 05 06.73 22.47 21.748 21.14   19.99 ~ 32 0
105 SDSS J100141.04+015904.0 AGN 10 01 41.05 +01 59 04.1 22.702 21.651 20.128 19.542 18.916 ~ 20 0
106 2XMM J100141.3+021031 QSO 10 01 41.323 +02 10 31.30   21.351 20.975   20.541 ~ 30 0
107 2MASX J10014194+0203577 LIN 10 01 41.984 +02 03 58.15 20.88 19.56 18.54 17.427 16.11 ~ 29 0
108 ACS-GC 20031003 AGN 10 01 47.289 +01 52 58.28   24.171 22.723   19.719 ~ 22 0
109 SDSS J100147.34+020314.1 AGN 10 01 47.3509417152 +02 03 14.124069252 22.461 21.265 19.645 18.998 18.354 ~ 21 0
110 COSMOS2015 541953 AGN 10 01 51.218 +02 07 15.06 23.320 22.61 21.291 20.691 20.044 ~ 17 0
111 COSMOS2015 424136 QSO 10 01 52.222 +01 56 08.66 24.88 24.449 23.930   21.810 ~ 29 0
112 COSMOS2015 632279 QSO 10 01 57.920 +02 15 18.93 23.79 23.47 22.53 21.976 20.914 ~ 13 0
113 COSMOS2015 520512 AGN 10 01 59.1610 +02 05 21.370   23.882 23.585   21.800 ~ 16 0
114 ACS-GC 20058647 AGN 10 02 02.549 +02 01 45.31 23.100 22.93 22.30 21.982 21.051 ~ 39 0
115 COSMOS2015 562400 AGN 10 02 03.098 +02 09 07.18 22.240 21.945 21.284 20.850 20.434 ~ 25 0
116 ACS-GC 20108753 AGN 10 02 23.0270 +02 20 09.840 25.40 24.960 24.623   22.571 ~ 22 0
117 ACS-GC 20107100 AGN 10 02 25.3380 +02 26 14.100   25.451 24.850   22.703 ~ 17 0
118 SDSS J100233.35+022751.6 AGN 10 02 33.358 +02 27 51.91 24.58 24.08 22.74 22.16 21.072 ~ 23 0
119 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 805 2

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2022.09.24-18:41:38

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