1999ApJ...518..656U

Query : 1999ApJ...518..656U

1999ApJ...518..656U - Astrophys. J., 518, 656-671 (1999/June-3)

logN-logS relations and spectral properties of sources from the ASCA large sky survey: their implications for the origin of the cosmic X-ray background (CXB).

UEDA Y., TAKAHASHI T., INOUE H., TSURU T., SAKANO M., ISHISAKI Y., OGASAKA Y., MAKISHIMA K., YAMADA T., AKIYAMA M. and OHTA K.

Abstract (from CDS):

We carried out the first wide-area unbiased survey with the ASCA satellite in the 0.7-10 keV band around a north Galactic-pole region covering a continuous area of 7deg2 (Large Sky Survey; LSS). To make the best use of ASCA's capabilities, we developed a new source-detection method in which the complicated detector responses are fully taken into account. Applying this method to the entire LSS data independently in the total (0.7-7 keV), hard (2-10 keV), and soft (0.7-2 keV) bands, we detected 107 sources altogether, with sensitivity limits of 6x10–14 (0.7-7 keV), 1x10–13 (2-10 keV), and 2x10–14 ergs.s–1.cm–2 (0.7-2 keV), respectively. A complete list of the detected sources is presented. Based on detailed studies by Monte Carlo simulations, we evaluated the effects of the source confusion and accurately derived the logN-logS relation in each survey band. The logN-logS relation in the hard band is located on the extrapolation from Ginga and HEAO1 results with a Euclidean slope of -3/2, while that in the soft band is consistent with the results from ROSAT. At these flux limits, 30%±3% of the CXB in the 0.7-7 keV band and 23%±3% in the 2-10 keV band have been resolved into discrete sources. The average spectrum of faint sources detected in the total band shows a photon index of 1.63±0.07 in the 0.7-10 keV range, consistent with the comparison of source counts between the hard and soft energy bands. Those detected in the hard band show a photon index of 1.49±0.10 in the 2-10 keV range. These spectral properties suggest that the contribution of sources with hard energy spectra becomes significant at a flux of 10–13 ergs.s–1.cm–2 (2-10 keV). The most plausible candidates are type II active galactic nuclei, as indicated by on-going optical identifications.

Abstract Copyright: ∼

Journal keyword(s): Cosmology: Diffuse Radiation - Galaxies: Active - Galaxies: Statistics - X-Rays: Galaxies

VizieR on-line data: <Available at CDS (J/ApJ/518/656): table3.dat>

Simbad objects: 112

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Number of rows : 112
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 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
3 ZwCl 1305+2941 ClG 13 07 49.16 +29 25 49.2     18.00 16.34   ~ 41 0
4 PB 3336 QSO 13 08 04.0016328336 +29 50 27.815224128   19.22 18.83     ~ 27 0
5 PB 3344 QSO 13 08 29.6752629072 +30 05 38.996571948   17.06 17.17 16.29   ~ 56 0
6 2MASS J13084129+2955473 AGN 13 08 41.3109164112 +29 55 47.412868404   19.15   17.34   ~ 9 0
7 AX J1308.8+3015 X 13 08 52 +30 15.0           ~ 1 0
8 AX J1309.4+2942 X 13 09 28 +29 42.4           ~ 1 0
9 1RXS J130927.3+295204 Sy2 13 09 28.2 +29 52 10   22.30 21.39 19.93   ~ 7 0
10 AX J1309.9+3024 X 13 09 54 +30 24.5           ~ 1 0
11 AX J1309.9+2959 X 13 09 57 +29 59.3           ~ 1 0
12 AX J1309.9+3046 X 13 09 58 +30 46.9           ~ 1 0
13 AX J1310.1+3041 X 13 10 09 +30 41.3           ~ 1 0
14 AX J1310.2+3052 X 13 10 15 +30 52.2           ~ 1 0
15 PB 3366 QSO 13 10 16.0016514096 +30 04 16.827896640   18.70 18.46 17.90   ~ 28 0
16 US 369 QSO 13 10 24.5843391096 +30 19 28.211532204 19.38 19.05 19.07 18.32   ~ 33 0
17 AX J1310.4+2930 X 13 10 29 +29 30.7           ~ 1 0
18 AX J1310.6+3021 X 13 10 39 +30 21.5           ~ 1 0
19 AX J1310.7+3107 X 13 10 45 +31 08.0           ~ 1 0
20 AX J1310.7+3112 X 13 10 47 +31 12.6           ~ 1 0
21 [VV2000] J131053.4+300429 QSO 13 10 53.4083100984 +30 04 29.750253204   20.06 19.72 19.17   ~ 7 0
22 2MASS J13105506+3004115 Sy2 13 10 55.0541365202 +30 04 11.324838796   19.69 19.69 17.68   ~ 7 0
23 AX J1311.1+2941 X 13 11 12 +29 41.3           ~ 1 0
24 AX J1311.2+3049 X 13 11 12 +30 49.8           ~ 1 0
25 PB 3380 QSO 13 11 28.4133804528 +31 05 52.194842016   18.22 17.91 17.15   ~ 33 0
26 AX J1311.7+3109 X 13 11 47 +31 09.5           ~ 1 0
27 1RXP J131157.4+305448 Sy1 13 11 56.5 +30 54 47   20.37 20.37 19.25   ~ 6 0
28 AX J1311.9+3010 X 13 11 59 +30 10.5           ~ 1 0
29 AX J1312.0+3007 X 13 12 04 +30 07.1           ~ 1 0
30 AX J1312.0+3031 X 13 12 05 +30 31.1           ~ 1 0
31 AX J1312.1+3127 X 13 12 11 +31 27.1           ~ 1 0
32 AX J1312.1+3048 PaG 13 12 11.95008 +30 48 21.6612           ~ 8 0
33 AX J1312.2+3006 X 13 12 15 +30 06.4           ~ 1 0
34 RX J1312.3+2937 X 13 12 20 +29 38.2           ~ 3 0
35 US 430 QSO 13 12 48.7976595912 +31 13 00.590064888   18.60 18.32 17.85   ~ 43 1
36 AX J1312.8+3107 X 13 12 49 +31 07.2           ~ 1 0
37 AX J1312.9+3045 X 13 12 56 +30 46.0           ~ 1 0
38 [VV2000] J131320.4+311921 QSO 13 13 20.4678897360 +31 19 21.430751232   20.10 19.92 19.81   ~ 7 0
39 AX J1313.3+3100 X 13 13 22 +31 00.5           ~ 1 0
40 AX J1313.4+3135 X 13 13 26 +31 35.7           ~ 1 0
41 6C 131109+321122 BLL 13 13 27.46211 +31 55 21.3221   19.52 19.10 17.58   ~ 30 1
42 AX J1313.4+3204 X 13 13 29 +32 04.4           ~ 1 0
43 [VV2000] J131344.2+311831 QSO 13 13 44.1770596752 +31 18 30.190858308   19.53 19.27 19.26   ~ 6 0
44 AX J1313.9+3207 X 13 13 54 +32 07.1           ~ 1 0
45 AX J1313.9+3205 X 13 13 55 +32 05.8           ~ 1 0
46 AX J1313.9+3127 X 13 13 56 +31 27.7           ~ 1 0
47 AX J1313.9+3103 X 13 13 59 +31 03.2           ~ 1 0
48 AX J1314.0+3032 X 13 14 05 +30 32.9           ~ 1 0
49 2MASX J13140640+3158448 Sy1 13 14 06.4345832568 +31 58 44.659226820   18.55 18.12 16.66   ~ 25 0
50 AX J1314.1+3202 X 13 14 08 +32 02.6           ~ 1 0
51 AX J1314.2+3151 X 13 14 12 +31 51.8           ~ 1 0
52 AX J1314.2+3153 X 13 14 15 +31 53.3           ~ 1 0
53 AX J1314.7+3123 X 13 14 44 +31 23.3           ~ 1 0
54 AX J1315.0+3142 X 13 15.0 +31 42           ~ 2 0
55 2MFGC 10568 Sy2 13 15 01.1718547416 +31 41 29.081482872   17.25   15.62   ~ 25 0
56 AX J1315.2+3157 X 13 15 12 +31 57.6           ~ 1 0
57 AX J1315.1+3201 X 13 15 12 +32 02.0           ~ 1 0
58 AX J1315.2+3114 X 13 15 13 +31 14.7           ~ 1 0
59 AX J1315.2+3208 X 13 15 14 +32 08.7           ~ 1 0
60 PB 3437 QSO 13 15 20.9475557280 +31 59 21.827765364   18.16 17.98 17.72   ~ 31 1
61 AX J1315.3+3218 X 13 15 23 +32 18.3           ~ 1 0
62 AX J1315.4+3234 X 13 15 26 +32 34.8           ~ 1 0
63 PB 3439 Sy1 13 15 28.5896894664 +31 17 44.056248468   19.28 19.15 18.79   ~ 23 0
64 AX J1315.6+3206 X 13 15 39 +32 06.8           ~ 1 0
65 AX J1315.8+3237 Sy2 13 15 50.3935815047 +32 37 36.817750718   19.7 19.74 18.1   ~ 8 0
66 AX J1315.9+3135 X 13 15 57 +31 35.6           ~ 1 0
67 RX J1316.1+3104 X 13 16 10 +31 05.2           ~ 3 0
68 AX J1316.3+3248 X 13 16 21 +32 48.9           ~ 1 0
69 NVSS J131638+314957 rG 13 16 38.912 +31 49 56.89   20.0       ~ 6 1
70 AX J1316.6+3211 X 13 16 39 +32 11.5           ~ 1 0
71 AX J1316.8+3222 X 13 16 51 +32 22.9           ~ 1 0
72 AX J1316.8+3133 X 13 16 52 +31 33.7           ~ 1 0
73 AX J1316.8+3155 X 13 16 52 +31 55.2           ~ 1 0
74 AX J1316.9+3304 X 13 16 55 +33 04.8           ~ 1 0
75 [VV2000] J131709.6+323713 Sy1 13 17 09.5801912760 +32 37 13.294922340   20.20 19.96 18.64   ~ 7 0
76 AX J1317.1+3154 X 13 17 10 +31 54.4           ~ 1 0
77 [VV2000] J131725.9+320259 QSO 13 17 25.9953680976 +32 03 00.735196068   19.32 19.12 19.10   ~ 7 0
78 LEDA 2020404 Sy2 13 17 27.0327482880 +33 00 23.428280880   18.89   16.64   ~ 11 0
79 AX J1317.5+3222 X 13 17 31 +32 22.6           ~ 1 0
80 AX J1317.5+3225 X 13 17 36 +32 25.9           ~ 1 0
81 AX J1317.7+3220 X 13 17 42 +32 20.7           ~ 1 0
82 AX J1317.7+3152 X 13 17 43 +31 52.8           ~ 1 0
83 AX J1317.9+3257 Sy2 13 18 00.2197073760 +32 57 52.444244448   19.76 19.76 17.99   ~ 12 0
84 2MASX J13180544+3349378 Sy1 13 18 05.4171780984 +33 49 37.818501888   13.82   13.38   ~ 16 0
85 AX J1318.1+3335 X 13 18 09 +33 35.3           ~ 1 0
86 AX J1318.2+3303 X 13 18 12 +33 03.2           ~ 1 0
87 AX J1318.2+3301 X 13 18 14 +33 01.2           ~ 1 0
88 [VV2000] J131817.5+324052 QSO 13 18 17.6469192216 +32 40 52.992337764   18.37 18.13 17.46   ~ 32 0
89 AX J1318.3+3232 X 13 18 21 +32 32.3           ~ 1 0
90 LEDA 3096245 Sy1 13 18 23.7756154968 +33 47 37.346884584   18.06 17.76 16.35   ~ 19 0
91 AX J1318.5+3341 Sy2 13 18 31.65356 +33 41 46.3808   21.72 21.72 20.60   ~ 9 0
92 1RXP J131831.5+332038 Sy1 13 18 31.6851921360 +33 20 36.966687000   20.42 20.42 19.70   ~ 10 0
93 AX J1318.5+3259 X 13 18 32.18 +32 59 14.3           ~ 3 0
94 AX J1318.7+3311 X 13 18 42 +33 11.8           ~ 1 0
95 AX J1318.7+3306 X 13 18 44 +33 06.1           ~ 1 0
96 RX J1318.8+3326 X 13 18 50.66 +33 26 10.0           ~ 4 0
97 AX J1319.0+3308 X 13 19 04 +33 08.6           ~ 1 0
98 AX J1319.0+3303 X 13 19 06 +33 03.7           ~ 1 0
99 AX J1319.2+3345 X 13 19 18 +33 45.6           ~ 1 0
100 AX J1319.3+3238 X 13 19 18 +32 38.7           ~ 1 0
101 SDSS J131927.17+334313.7 Sy1 13 19 27.180 +33 43 13.75   19.46 19.26 18.90   ~ 9 0
102 AX J1319.4+3330 X 13 19 29 +33 30.7           ~ 1 0
103 AX J1319.4+3251 Sy1 13 19 29.8 +32 50 45   19.38 19.38 18.43   ~ 5 0
104 AX J1319.5+3338 X 13 19 36 +33 38.4           ~ 1 0
105 AX J1319.6+3355 X 13 19 39 +33 55.8           ~ 1 0
106 AX J1320.1+3351 X 13 20 11 +33 51.7           ~ 1 0
107 AX J1320.1+3257 X 13 20 11 +32 57.4           ~ 1 0
108 [AOY2000] AX J132032+3326 A ClG 13 20 31.25 +33 26 26.9       18.28   ~ 2 0
109 AX J1320.9+3328 X 13 20 54 +33 28.1           ~ 1 0
110 ACO 1716 ClG 13 20 56.1 +33 54 15           ~ 23 0
111 AX J1321.0+3309 X 13 21 05 +33 09.5           ~ 1 0
112 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0

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