2004AJ....127..213W

Query : 2004AJ....127..213W

2004AJ....127..213W - Astron. J., 127, 213-229 (2004/January-0)

The 172 ks Chandra exposure of the LALA Bootes field: X-ray source catalog.

WANG J.X., MALHOTRA S., RHOADS J.E., BROWN M.J.I., DEY A., HECKMAN T.M., JANNUZI B.T., NORMAN C.A., TIEDE G.P. and TOZZI P.

Abstract (from CDS):

We present an analysis of a deep, 172 ks Chandra observation of the Large Area Lyman Alpha survey (LALA) Bootes field, obtained with the Advanced CCD Imaging Spectrometer (ACIS-I) on board the Chandra X-Ray Observatory. This is one of the deepest Chandra images of the extragalactic sky; only the 2 Ms Chandra Deep Field North (CDF-N) and 1 Ms Chandra Deep Field South (CDF-S) are substantially deeper. In this paper we present the X-ray source catalog obtained from this image, along with an analysis of source counts and optical identifications. The X-ray image is composed of two individual observations obtained in 2002 and reaches 0.5-2.0 and 2.0-10.0 keV flux limits of 1.5x10–16 and 1.0x10–15 ergs/cm2/s, respectively, for point sources near the aim point. A total of 168 X-ray sources were detected: 160 in the 0.5-7.0 keV band, 132 in the 0.5-2.0 keV band, and 111 in the 2.0-7.0 keV band. The X-ray source counts were derived and compared with those from other Chandra deep surveys; the hard X-ray source density of the LALA Bootes field is 33% higher than that of CDF-S at the flux level of 2.0x10–15 ergs/cm2/s, confirming the field-to-field variances of the hard-band source counts reported by previous studies. The deep exposure resolves ≳72% of the 2.0-10.0 keV X-ray background. Our primary optical data are R-band imaging from the NOAO Deep Wide-Field Survey (NDWFS), with a limiting magnitude of R=25.7 (Vega, 3 σ, and 4" diameter aperture). We have found optical counterparts for 152 of the 168 Chandra sources (90%); 144 of these are detected in the R-band image, and eight have optical counterparts in other bands (either BW, V, I, or z'). Among the R-band nondetected sources, not more than 11 of them can possibly be at z>5, based on the hardness ratios of their X-ray emission and nondetections in bluer bands (BW, V). The majority (∼76%) of the X-ray sources are found to have log(fX/fR) within 0.0±1; these are believed to be AGNs. Most of the X-ray-faint/optically bright sources [log(fX/fR)←1.0] are optically extended; these are low-z normal galaxies or low-luminosity AGNs. There is also a population of sources that are X-ray overluminous for their optical magnitudes [log(fX/fR)>1.0], which are harder in X-ray and are probably obscured AGNs.

Abstract Copyright: ∼

Journal keyword(s): Catalogs - Galaxies: Active - Galaxies: High-Redshift - X-rays: diffuse background - X-rays: galaxies

VizieR on-line data: <Available at CDS (J/AJ/127/213): table1.dat>

Nomenclature: Table 1. col(1): [WMR2004] NNN (Nos 1-168) = Table 1. col(2): CXOLALA1 JHHMMSS.s+DDMMSS N=168.

Simbad objects: 171

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Number of rows : 171
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 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 686 0
3 CXOLALA1 J142447.8+353138 X 14 24 47.80 +35 31 38.8           ~ 1 0
4 CXOLALA1 J142448.4+353227 X 14 24 48.48 +35 32 27.4           ~ 1 0
5 CXOLALA1 J142454.8+353431 X 14 24 54.80 +35 34 31.9           ~ 1 0
6 SDSS J142457.19+353518.1 QSO 14 24 57.1929445800 +35 35 18.087103464       19.99 19.48 ~ 8 0
7 CXOLALA1 J142457.3+353627 X 14 24 57.33 +35 36 27.5           ~ 1 0
8 CXOLALA1 J142458.1+353919 X 14 24 58.14 +35 39 19.4           ~ 1 0
9 CXOLALA1 J142459.2+353751 X 14 24 59.24 +35 37 51.4           ~ 1 0
10 CXOLALA1 J142501.2+353622 X 14 25 01.20 +35 36 22.0           ~ 1 0
11 CXOLALA1 J142501.2+353057 X 14 25 01.28 +35 30 57.4           ~ 1 0
12 CXOLALA1 J142501.5+354000 X 14 25 01.58 +35 40 00.3           ~ 1 0
13 CXOLALA1 J142502.9+353512 X 14 25 02.94 +35 35 12.8           ~ 1 0
14 CXOLALA1 J142503.1+353421 X 14 25 03.16 +35 34 21.2           ~ 1 0
15 CXOLALA1 J142503.5+353859 AGN 14 25 03.513 +35 38 58.87       20.23 19.44 ~ 2 0
16 SDSS J142503.80+353345.4 QSO 14 25 03.8101687656 +35 33 45.413669520       20.28 19.87 ~ 4 0
17 CXOLALA1 J142504.4+353514 X 14 25 04.47 +35 35 14.6           ~ 1 0
18 CXOLALA1 J142504.5+354107 QSO 14 25 04.620 +35 41 08.08       21.37 20.43 ~ 5 0
19 CXOLALA1 J142505.1+354054 X 14 25 05.16 +35 40 54.9           ~ 1 0
20 CXOLALA1 J142505.2+353729 X 14 25 05.25 +35 37 29.5           ~ 1 0
21 SDSS J142509.20+353527.5 QSO 14 25 09.2015082720 +35 35 27.438234540       20.84 20.24 ~ 5 0
22 CXOLALA1 J142509.3+354356 X 14 25 09.39 +35 43 56.1           ~ 1 0
23 CXOLALA1 J142509.5+354244 AGN 14 25 09.449 +35 42 46.75       20.75 19.84 ~ 5 0
24 CXOLALA1 J142509.5+353747 X 14 25 09.50 +35 37 47.5           ~ 1 0
25 CXOLALA1 J142510.1+353411 X 14 25 10.19 +35 34 11.4           ~ 1 0
26 CXOLALA1 J142510.9+353602 X 14 25 10.94 +35 36 02.8           ~ 1 0
27 NDWFS J142511.3+353857 X 14 25 11.32 +35 38 57.8       24.74 24.16 ~ 4 0
28 SDSS J142512.01+353124.2 QSO 14 25 12.052 +35 31 24.30       20.83 19.50 ~ 3 0
29 CXOLALA1 J142513.1+353323 AGN 14 25 13.206 +35 33 23.05       18.49 17.77 ~ 2 0
30 CXOLALA1 J142514.3+353618 AGN 14 25 14.342 +35 36 18.56       19.84 19.19 ~ 2 0
31 CXOLALA1 J142514.3+353918 X 14 25 14.37 +35 39 18.2           ~ 1 0
32 CXOLALA1 J142514.9+354004 X 14 25 14.90 +35 40 04.1           ~ 1 0
33 CXOLALA1 J142516.0+353142 X 14 25 16.00 +35 31 42.3           ~ 1 0
34 CXOLALA1 J142516.0+354325 X 14 25 16.02 +35 43 25.8           ~ 1 0
35 CXOLALA1 J142516.4+352940 AGN 14 25 16.42 +35 29 41.2           ~ 2 0
36 CXOLALA1 J142516.6+354129 X 14 25 16.67 +35 41 29.6           ~ 1 0
37 CXOLALA1 J142517.6+353453 X 14 25 17.61 +35 34 53.0           ~ 1 0
38 CXOLALA1 J142517.7+353754 X 14 25 17.71 +35 37 54.3           ~ 1 0
39 CXOLALA1 J142517.7+353822 AGN 14 25 17.732 +35 38 21.78       19.17 18.45 ~ 5 0
40 SDSS J142519.73+354432.3 QSO 14 25 19.747 +35 44 32.52       21.87 21.47 ~ 7 0
41 SDSS J142520.77+353311.2 QSO 14 25 20.780 +35 33 11.25           ~ 2 0
42 CXOLALA1 J142521.1+353340 X 14 25 21.10 +35 33 40.0           ~ 1 0
43 CXOLALA1 J142521.3+353029 AGN 14 25 21.38 +35 30 29.5           ~ 2 0
44 CXOLALA1 J142521.8+353407 X 14 25 21.87 +35 34 07.8           ~ 1 0
45 CXOLALA1 J142522.4+353517 X 14 25 22.40 +35 35 17.2           ~ 2 0
46 CXOLALA1 J142522.8+353116 X 14 25 22.82 +35 31 16.8           ~ 1 0
47 CXOLALA1 J142523.0+354313 AGN 14 25 23.034 +35 43 14.64       21.41 21.18 ~ 2 0
48 CXOLALA1 J142523.4+353512 X 14 25 23.49 +35 35 12.4           ~ 1 0
49 CXOLALA1 J142523.6+353216 X 14 25 23.69 +35 32 16.7           ~ 1 0
50 2MASS J14252370+3528237 Sy2 14 25 23.7009837192 +35 28 24.144894012       18.51 17.94 ~ 6 0
51 CXOLALA1 J142523.8+354122 X 14 25 23.80 +35 41 22.4           ~ 1 0
52 CXOLALA1 J142524.2+352928 X 14 25 24.22 +35 29 28.6           ~ 1 0
53 SDSS J142524.34+352541.5 QSO 14 25 24.3456402792 +35 25 41.461416048       21.48 20.31 ~ 3 0
54 CXOLALA1 J142524.7+353037 X 14 25 24.70 +35 30 37.1           ~ 1 0
55 CXOLALA1 J142525.4+353622 X 14 25 25.40 +35 36 22.8           ~ 1 0
56 CXOLALA1 J142525.7+353841 X 14 25 25.72 +35 38 41.5           ~ 1 0
57 CXOLALA1 J142526.6+353327 X 14 25 26.66 +35 33 27.2           ~ 1 0
58 CXOLALA1 J142526.6+353140 X 14 25 26.68 +35 31 40.8           ~ 2 0
59 CXOLALA1 J142527.4+353257 X 14 25 27.46 +35 32 57.9           ~ 1 0
60 CXOLALA1 J142527.4+353101 X 14 25 27.49 +35 31 01.0           ~ 1 0
61 [WMR2004] 145 * 14 25 27.5030125872 +35 26 56.823561960           ~ 2 0
62 CXOLALA1 J142527.5+354012 X 14 25 27.59 +35 40 12.1           ~ 2 0
63 CXOLALA1 J142528.2+353958 X 14 25 28.24 +35 39 58.4           ~ 1 0
64 CXOLALA1 J142528.8+353342 X 14 25 28.80 +35 33 42.0           ~ 1 0
65 CXOLALA1 J142529.2+353248 X 14 25 29.22 +35 32 48.4           ~ 1 0
66 CXOLALA1 J142529.2+353412 X 14 25 29.24 +35 34 12.2           ~ 1 0
67 CXOLALA1 J142529.9+353640 X 14 25 29.91 +35 36 40.0           ~ 1 0
68 CXOLALA1 J142530.6+353420 X 14 25 30.63 +35 34 20.3           ~ 2 0
69 CXOLALA1 J142530.7+353911 X 14 25 30.71 +35 39 11.3           ~ 2 0
70 CXOLALA1 J142530.8+353208 X 14 25 30.82 +35 32 08.6           ~ 1 0
71 CXOLALA1 J142530.9+352756 X 14 25 30.95 +35 27 56.8           ~ 1 0
72 CXOLALA1 J142531.1+353921 X 14 25 31.17 +35 39 21.6           ~ 2 0
73 [WMR2004] 109 Sy2 14 25 31.405 +35 44 53.81       20.00 19.30 ~ 3 0
74 CXOLALA1 J142531.6+352659 X 14 25 31.60 +35 26 59.0           ~ 1 0
75 CXOLALA1 J142532.6+352838 X 14 25 32.66 +35 28 38.8           ~ 1 0
76 CXOLALA1 J142533.0+353648 X 14 25 33.09 +35 36 48.5           ~ 1 0
77 CXOLALA1 J142533.3+353130 X 14 25 33.33 +35 31 30.6           ~ 1 0
78 NDWFS J142533.5+353845 X 14 25 33.51 +35 38 45.6       22.67 22.08 ~ 4 0
79 CXOLALA1 J142533.8+354138 QSO 14 25 33.794 +35 41 37.73       20.61 19.16 ~ 5 0
80 FIRST J142534.5+353551 rG 14 25 34.523 +35 35 51.36       20.63 19.26 ~ 2 0
81 CXOLALA1 J142534.7+353407 X 14 25 34.76 +35 34 07.8           ~ 1 0
82 CXOLALA1 J142535.9+353102 AGN 14 25 35.92 +35 31 02.0           ~ 2 0
83 SDSS J142536.00+354106.9 QSO 14 25 36.0034690896 +35 41 06.889854372       19.94 19.11 ~ 8 0
84 CXOLALA1 J142536.3+353634 X 14 25 36.32 +35 36 34.2           ~ 1 0
85 CXOLALA1 J142536.8+353147 X 14 25 36.81 +35 31 47.2           ~ 1 0
86 CXOLALA1 J142536.9+353209 X 14 25 36.99 +35 32 09.3           ~ 1 0
87 CXOLALA1 J142537.1+354309 X 14 25 37.15 +35 43 09.8           ~ 1 0
88 CXOLALA1 J142537.9+353612 AGN 14 25 37.989 +35 36 11.45       20.68 19.53 ~ 3 0
89 CXOLALA1 J142538.2+353438 X 14 25 38.29 +35 34 38.0           ~ 1 0
90 CXOLALA1 J142538.5+353429 QSO 14 25 38.525 +35 34 29.41       22.48 21.39 ~ 2 0
91 CXOLALA1 J142538.7+353618 X 14 25 38.72 +35 36 18.0           ~ 1 0
92 CXOLALA1 J142538.7+353342 X 14 25 38.73 +35 33 42.1           ~ 1 0
93 CXOLALA1 J142539.5+353357 X 14 25 39.55 +35 33 57.9           ~ 2 0
94 CXOLALA1 J142539.6+353942 X 14 25 39.65 +35 39 42.6           ~ 1 0
95 CXOLALA1 J142539.8+354438 X 14 25 39.87 +35 44 38.6           ~ 1 0
96 2MASS J14254010+3546242 Sy2 14 25 40.1219604144 +35 46 24.272410656       16.30 15.65 ~ 6 0
97 CXOLALA1 J142541.6+354107 X 14 25 41.66 +35 41 07.2           ~ 1 0
98 CXOLALA1 J142541.8+354249 X 14 25 41.80 +35 42 49.7           ~ 1 0
99 CXOLALA1 J142542.5+353358 X 14 25 42.53 +35 33 58.2           ~ 1 0
100 CXOLALA1 J142543.3+353548 X 14 25 43.31 +35 35 48.1           ~ 1 0
101 CXOLALA1 J142544.2+354018 X 14 25 44.20 +35 40 18.4           ~ 2 0
102 CXOLALA1 J142544.7+353954 X 14 25 44.70 +35 39 54.1           ~ 1 0
103 [WMR2004] 102 Sy2 14 25 44.765 +35 40 45.92       20.11 19.29 ~ 3 0
104 CXOLALA1 J142545.1+353616 X 14 25 45.17 +35 36 16.3           ~ 1 0
105 CXOLALA1 J142545.3+353449 X 14 25 45.33 +35 34 49.7           ~ 1 0
106 CXOLALA1 J142545.4+352711 X 14 25 45.44 +35 27 11.8           ~ 1 0
107 CXOLALA1 J142545.5+353003 X 14 25 45.53 +35 30 03.6           ~ 1 0
108 CXOLALA1 J142545.6+353152 QSO 14 25 45.677 +35 31 52.68       21.97 21.86 ~ 2 0
109 2MASS J14254578+3532282 AGN 14 25 45.7995789672 +35 32 28.027997520           ~ 2 0
110 CXOLALA1 J142545.8+353849 X 14 25 45.85 +35 38 49.2           ~ 1 0
111 CXOLALA1 J142546.0+353826 X 14 25 46.02 +35 38 26.3           ~ 1 0
112 CXOLALA1 J142546.1+353354 X 14 25 46.13 +35 33 54.9           ~ 1 0
113 CXOLALA1 J142546.3+353349 X 14 25 46.33 +35 33 49.4           ~ 2 0
114 SDSS J142546.49+353522.0 G 14 25 46.49896 +35 35 22.0959           ~ 2 0
115 CXOLALA1 J142546.9+353240 AGN 14 25 46.957 +35 32 39.81       18.39 17.81 ~ 2 0
116 [WMR2004] 4 PM* 14 25 47.1299525112 +35 39 54.674845776           ~ 2 0
117 CXOLALA1 J142547.2+353627 X 14 25 47.25 +35 36 27.6           ~ 1 0
118 CXOLALA1 J142547.2+353728 X 14 25 47.25 +35 37 28.0           ~ 1 0
119 SDSS J142547.44+352719.7 QSO 14 25 47.4525943560 +35 27 19.670567076       19.84 19.28 ~ 10 0
120 CXOLALA1 J142547.6+353043 X 14 25 47.67 +35 30 43.0           ~ 1 0
121 NDWFS J142548.2+353041 X 14 25 48.21 +35 30 41.1       21.42 21.76 ~ 4 0
122 CXOLALA1 J142548.5+353507 X 14 25 48.58 +35 35 07.8           ~ 1 0
123 CXOLALA1 J142549.2+353615 X 14 25 49.26 +35 36 15.3           ~ 1 0
124 CXOLALA1 J142549.8+353619 X 14 25 49.81 +35 36 19.0           ~ 1 0
125 CXOLALA1 J142549.9+353203 X 14 25 49.90 +35 32 03.8           ~ 1 0
126 CXOLALA1 J142550.4+353247 X 14 25 50.49 +35 32 47.9           ~ 1 0
127 CXOLALA1 J142550.6+353743 X 14 25 50.67 +35 37 43.1           ~ 1 0
128 CXOLALA1 J142550.8+353033 X 14 25 50.81 +35 30 33.6           ~ 1 0
129 CXOLALA1 J142551.0+353307 X 14 25 51.00 +35 33 07.2           ~ 1 0
130 CXOLALA1 J142551.1+353015 X 14 25 51.16 +35 30 15.7           ~ 1 0
131 2MASS J14255139+3534042 Sy2 14 25 51.3874733592 +35 34 04.100760732       17.36 16.64 ~ 7 0
132 CXOLALA1 J142551.4+353433 X 14 25 51.43 +35 34 33.1           ~ 1 0
133 CXOLALA1 J142552.2+353823 X 14 25 52.27 +35 38 23.7           ~ 1 0
134 CXOLALA1 J142552.4+353730 X 14 25 52.45 +35 37 30.3           ~ 1 0
135 CXOLALA1 J142552.4+352724 X 14 25 52.47 +35 27 24.1           ~ 1 0
136 CXOLALA1 J142552.7+353448 X 14 25 52.72 +35 34 48.2           ~ 1 0
137 CXOLALA1 J142553.6+353314 AGN 14 25 53.688 +35 33 14.62       21.42 20.87 ~ 3 0
138 CXOLALA1 J142553.8+353826 X 14 25 53.80 +35 38 26.0           ~ 1 0
139 CXOLALA1 J142554.1+353237 X 14 25 54.11 +35 32 37.1           ~ 1 0
140 CXOLALA1 J142555.4+353650 X 14 25 55.40 +35 36 50.4           ~ 2 0
141 CXOLALA1 J142555.5+353528 AGN 14 25 55.50 +35 35 28.5           ~ 2 0
142 CXOLALA1 J142555.9+353240 QSO 14 25 55.974 +35 32 40.69       22.96 21.24 ~ 2 0
143 CXOLALA1 J142556.3+354018 AGN 14 25 56.326 +35 40 18.22       20.70 19.73 ~ 2 0
144 CXOLALA1 J142556.9+353845 X 14 25 56.94 +35 38 45.1           ~ 1 0
145 CXOLALA1 J142557.6+353445 QSO 14 25 57.6526000896 +35 34 45.838750548       19.84 19.31 ~ 5 0
146 CXOLALA1 J142557.7+353512 AGN 14 25 57.70 +35 35 12.4           ~ 2 0
147 CXOLALA1 J142558.1+353216 X 14 25 58.13 +35 32 16.1           ~ 2 0
148 CXOLALA1 J142558.2+353144 X 14 25 58.29 +35 31 44.4           ~ 1 0
149 CXOLALA1 J142600.2+353442 AGN 14 26 00.24 +35 34 42.4           ~ 2 0
150 CXOLALA1 J142601.1+354151 AGN 14 26 01.210 +35 41 50.36       20.94 19.89 ~ 2 0
151 CXOLALA1 J142601.7+352802 X 14 26 01.71 +35 28 02.8           ~ 1 0
152 CXOLALA1 J142601.7+354037 X 14 26 01.72 +35 40 37.5           ~ 1 0
153 CXOLALA1 J142602.4+353605 QSO 14 26 02.416 +35 36 05.44       21.37 20.67 ~ 3 0
154 CXOLALA1 J142603.7+353246 AGN 14 26 03.67 +35 32 45.9           ~ 2 0
155 CXOLALA1 J142604.7+353015 AGN 14 26 04.85 +35 30 14.7           ~ 2 0
156 SDSS J142605.83+353508.4 QSO 14 26 05.8382650368 +35 35 08.412297216       20.11 19.43 ~ 7 0
157 CXOLALA1 J142606.7+353151 X 14 26 06.72 +35 31 51.3           ~ 1 0
158 SDSS J142607.71+353351.3 AG? 14 26 07.712 +35 33 51.39       18.28 16.59 ~ 12 0
159 CXOLALA1 J142609.5+353213 QSO 14 26 09.576 +35 32 13.54       22.23 21.48 ~ 5 0
160 FIRST J142610.9+354201 rG 14 26 10.958 +35 42 01.89       20.80 19.48 ~ 6 0
161 CXOLALA1 J142611.8+353301 X 14 26 11.85 +35 33 01.9           ~ 1 0
162 SDSS J142611.95+354230.0 QSO 14 26 11.956 +35 42 30.25       21.37 20.67 ~ 10 0
163 FIRST J142613.9+353445 Rad 14 26 13.916 +35 34 45.33           ~ 1 0
164 SDSS J142614.22+353832.9 QSO 14 26 14.2310862336 +35 38 32.910413604       20.92 20.35 ~ 4 0
165 CXOLALA1 J142614.2+353631 X 14 26 14.29 +35 36 31.5           ~ 1 0
166 CXOLALA1 J142616.9+353729 X 14 26 16.94 +35 37 29.4           ~ 1 0
167 CXOLALA1 J142618.6+353754 AGN 14 26 18.54 +35 37 53.1           ~ 2 0
168 CXOLALA1 J142618.8+354218 QSO 14 26 18.8764442952 +35 42 18.102929076       20.90 20.06 ~ 5 0
169 NVSS J142620+353706 rG 14 26 20.3847140064 +35 37 08.408968896       17.49 16.73 ~ 9 1
170 CXOLALA1 J142621.6+353931 X 14 26 21.63 +35 39 31.1           ~ 1 0
171 NAME NOAO Deep Wide Field reg 14 32 05.75 +34 16 47.5           ~ 430 0

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