2002A&A...394..835P


Query : 2002A&A...394..835P

2002A&A...394..835P - Astronomy and Astrophysics, volume 394, 835-849 (2002/11-2)

Exploring the spectral properties of faint hard X-ray sources with XMM-Newton.

PICONCELLI E., CAPPI M., BASSANI L., FIORE F., DI COCCO G. and STEPHEN J.B.

Abstract (from CDS):

We present a spectroscopic study of 41 hard X-ray sources detected serendipitously with high significance (>5σ in the 2-10keV band) in seven EPIC performance/verification phase observations. The large collecting area of EPIC allows us to explore the spectral properties of these faint hard X-ray sources with 2<F2–10< 80x10–14erg/cm2/s even though the length of the exposures are modest (∼20ks). Optical identifications are available for 21 sources of our sample. Using a simple power law plus Galactic absorption model we find an average value of the photon index Γ∼1.6-1.7, broadly consistent with recent measurements made at similar fluxes with ASCA and with Chandra stacked spectral analyses. We find that 31 out of 41 sources are well fitted by this simple model and only eight sources require absorption in excess of the Galactic value. Interestingly enough, one third of these absorbed sources are broad line objects, though with moderate column densities. Two sources in the sample are X-ray bright optically quiet galaxies and show flat X-ray spectra. Comparing our observational results with those expected from standard synthesis models of the cosmic X-ray background (CXB) we find a fraction of unabsorbed to absorbed sources larger than predicted by theoretical models at our completeness limit of F2–10∼5x10–14erg/cm2/s. The results presented here illustrate well how wide-angle surveys performed with EPIC on board XMM-Newton allow population studies of interesting and unusual sources to be made as well as enabling constraints to be placed on some input parameters for synthesis models of the CXB.

Abstract Copyright:

Journal keyword(s): galaxies: active - X-rays: galaxies - X-rays: diffuse background

CDS comments: Table 2 col.1 : designations "NN" not in Simbad.

Simbad objects: 49

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Number of rows : 49
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 ACO 2690 ClG 00 00 13.75 -25 11 11.5           ~ 23 0
2 HELLAS2XMM 26900001 Sy1 00 00 27.7 -25 04 43       19.1   ~ 13 0
3 UCAC4 326-000009 * 00 00 31.9151212704 -24 54 56.418588792   17.43 16.44 17.7   ~ 16 2
4 HELLAS2XMM 26900002 Sy1 00 01 00.2 -25 05 06   21.8   21.86   ~ 12 0
5 2XMM J000102.4-245849 Sy1 00 01 02.4 -24 58 49   22.94   20.3   ~ 14 0
6 2XMM J000106.7-250847 Sy1 00 01 06.8 -25 08 47   23.54 21.00 21   ~ 7 0
7 2XMM J000122.6-250020 Sy1 00 01 22.6724857656 -25 00 18.850281588   19.76 18.70 18.7   ~ 10 1
8 HELLAS2XMM 03120034 Sy2 03 09 12.1 -76 58 26       19.1   ~ 9 0
9 [VV2006] J031015.9-765131 QSO 03 10 15.7112501304 -76 51 33.069171456     19.20 17.6   ~ 17 0
10 HELLAS2XMM J031050.0-763904 Sy1 03 10 50.2 -76 39 04       18.6   ~ 9 0
11 HELLAS2XMM 03120009 Sy1 03 11 05.3 -76 51 58       23.2   ~ 8 0
12 QSO J0311-7651 BLL 03 11 55.2496997640 -76 51 50.848335324 15.27 16.09 16.10 15.33   ~ 216 1
13 [VV2006] J031209.2-765213 QSO 03 12 08.9563692984 -76 52 13.343579796     18.70 18.2   ~ 10 0
14 XMMU J031311.7-765428 AGN 03 12 12.1 -76 54 31           ~ 4 0
15 2MASS J03123866-7651335 AGN 03 12 38.7229128480 -76 51 33.137144424       18   ~ 19 0
16 HELLAS2XMM J031254.0-765415 Sy2 03 12 53.8 -76 54 15       22   ~ 10 0
17 HELLAS2XMM 03120003 Sy1 03 13 14.5 -76 55 57       18.3   ~ 9 0
18 SAX J0741.9+7427 X 07 41 57.9 +74 27 15           ~ 3 0
19 2E 1852 Sy1 07 43 12.5393029560 +74 29 36.758906988     17.53     ~ 26 0
20 2XMM J074350.6+743840 AG? 07 43 50.8 +74 38 40           ~ 4 0
21 2XMM J074352.8+744257 QSO 07 43 52.9202136024 +74 42 57.569871024       19.70   ~ 11 0
22 XMMU J074401.5+743041 X 07 44 01.5 +74 30 41           ~ 2 0
23 QSO B0737+744 BLL 07 44 05.3750968872 +74 33 58.256429832     16.89 16.6   ~ 124 0
24 XMS J122004.0+752145 QSO 12 20 03.6904931640 +75 21 45.570053844           ~ 3 0
25 NGC 4291 GiG 12 20 17.699 +75 22 15.47   17.0       ~ 290 1
26 QSO B1218+7522 QSO 12 20 51.3020520480 +75 05 31.481225484     18.2 17.70   ~ 34 0
27 Mrk 205 Sy1 12 21 44.0724099888 +75 18 38.241006228   15.64 15.24 14.7   ~ 458 0
28 2MASX J12220643+7526153 Sy2 12 22 06.5665656120 +75 26 15.144120672     18.70 17.40   ~ 33 0
29 [VV2003c] J122258.0+751935 Sy2 12 22 58.0 +75 19 35           ~ 6 0
30 2XMM J122350.9+752227 AGN 12 23 50.9 +75 22 28       19.20   ~ 12 0
31 XMMU J123013.4+642505 X 12 30 13.4 +64 25 05           ~ 2 0
32 [VV2006] J123049.7+640848 QSO 12 30 49.8003318624 +64 08 48.179889744   19.60 19.30 18.90   ~ 31 0
33 XMMU J123058.5+641726 X 12 30 58.5 +64 17 26           ~ 2 0
34 SDSS J123110.79+641849.5 QSO 12 31 10.7942832840 +64 18 49.475978208   20.34 20.05 18.70   ~ 13 0
35 2XMM J123116.5+641114 AGN 12 31 16.5110634353 +64 11 14.182687950   20.79 20.71     ~ 12 0
36 QSO B1229+6430 BLL 12 31 31.3949261640 +64 14 18.280701600   18.36 17.62 14.3   ~ 132 2
37 XMS J123214.1+640455 X 12 32 14.1 +64 04 55           ~ 3 0
38 2XMM J123218.6+640309 AGN 12 32 18.8335328904 +64 03 09.738518976           ~ 11 0
39 2XMM J133649.3+242000 QSO 13 36 49.2933920160 +24 20 00.420885528           ~ 5 0
40 HELLAS2XMM J133712.7+243251 X 13 37 12.790 +24 32 54.41           ~ 4 0
41 LEDA 101275 Sy1 13 37 18.7199358192 +24 23 03.319883484     15.0     ~ 374 0
42 2XMM J133730.8+242306 QSO 13 37 30.8017335672 +24 23 05.511464664   20.86 20.19     ~ 5 0
43 XMMU J133747.4+242728 X 13 37 47.4 +24 27 28           ~ 2 0
44 2MASS J13380752+2424105 QSO 13 38 07.5081216072 +24 24 11.299642416           ~ 31 0
45 XMMU J140053.0+030103 AGN 14 00 53.0 +03 01 03           ~ 2 0
46 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 657 1
47 1RXS J140125.2+025617 Sy1 14 01 27.6951898560 +02 56 06.086734152   20.60 19.91     ~ 25 0
48 XMMU J140130.7+024529 X 14 01 30.7 +02 45 29           ~ 2 0
49 2MASS J14014502+0253328 AGN 14 01 45.027 +02 53 32.83           ~ 4 0

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2022.08.12-14:55:47

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