2004AJ....127.2579Z

Query : 2004AJ....127.2579Z

2004AJ....127.2579Z - Astron. J., 127, 2579-2597 (2004/May-0)

Multicolor photometric observations of candidate optical counterparts to ROSAT faint X-ray sources in a 1 square degree field of the BATC survey.

ZHANG H., XUE S., BURSTEIN D., ZHOU X., JIANG Z., WU H., MA J., CHEN J. and ZOU Z.

Abstract (from CDS):

We present optical candidates for 75 X-ray sources in a ∼1 deg2 overlapping region with the 1997 medium-deep ROSAT survey by Molthagen et al. These candidates are selected using the multicolor CCD imaging observations made for the T329 field of the Beijing-Arizona-Taiwan-Connecticut (BATC) Sky Survey, which uses the NAOC 0.6/0.9 m Schmidt telescope with 15 intermediate-band filters covering the wavelength range 3360-9745 Å. These X-ray sources are relatively faint (CR≪0.2/s) and thus are mostly not included in the ROSAT Bright Source Catalogue; they also remain as X-ray sources without optical candidates in a previous identification program carried out by the Hamburg Quasar Survey. Within their position error circles, almost all of the X-ray sources are observed to contain one or more spatially associated optical candidates down to the magnitude mV∼23.1. We have classified 149 of 156 detected optical candidates with 73 of the 75 X-ray sources with a new method that predicts a redshift for nonstellar objects, which we have termed the SED-based Object Classification Approach. These optical candidates include 31 QSOs, 39 stars, 37 starburst galaxies, 42 galaxies, and seven ``just''-visible objects. Twenty-eight X-ray error circles have only one visible object in them: nine QSOs, three normal galaxies, eight starburst galaxies, six stars, and two of the just-visible objects. We have also cross-correlated the positions of these optical objects with NASA Extragalactic Database, the FIRST radio source catalog, and the Two Micron All Sky Survey. Separately, we have also SED-classified the remaining 6011 objects in our field of view. Optical objects are found at the 6.5 σ level above what one would expect from a random distribution; only QSOs are overrepresented in these error circles at greater than 4 σ frequency. We estimate redshifts for all extragalactic objects and find a good correspondence between our predicted redshift and the measured redshift (a mean error of 0.04 in Δz). There appears to be a supercluster at z∼0.3-0.35 in this direction, including many of the galaxies in the X-ray error circles that are found in this redshift range.

Abstract Copyright: ∼

Journal keyword(s): Catalogs - Galaxies: Active - Surveys - X-Rays

VizieR on-line data: <Available at CDS (J/AJ/127/2579): table2.dat>

Nomenclature: Table 2: [ZXB2004] RX JHHMM.m+DDMM N=75.

Simbad objects: 80

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Number of rows : 80
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 RX J0953.6+4757 X 09 53 37.9 +47 57 26   20.5       ~ 2 0
2 RX J0953.7+4722 X 09 53 47.4 +47 22 00   20.5       ~ 2 0
3 PDCS 36 ClG 09 53 53.7 +47 40 14           ~ 11 0
4 RX J0953.8+4740 X 09 53 53.8 +47 40 05   20.5       ~ 2 0
5 RX J0953.9+4721 X 09 53 54.7 +47 21 59   20.0       ~ 2 0
6 RX J0954.0+4736 X 09 54 00.9 +47 36 06   17.7       ~ 2 0
7 RX J0954.0+4756 X 09 54 01.0 +47 56 51   20.5       ~ 2 0
8 RX J0954.1+4708 X 09 54 12.0 +47 08 45   19.7       ~ 2 0
9 RX J0954.2+4746 X 09 54 13.9 +47 46 50   21.5       ~ 2 0
10 RX J0954.3+4759 X 09 54 20.2 +47 59 34   19.6       ~ 2 0
11 RX J0954.3+4740 X 09 54 21.9 +47 40 57   20.5       ~ 2 0
12 RX J0954.3+4747 X 09 54 23.5 +47 47 03   20.5       ~ 2 0
13 RX J0954.4+4715 X 09 54 28.3 +47 15 44   18.3       ~ 2 0
14 RX J0954.5+4753 X 09 54 30.4 +47 53 38   20.5       ~ 2 0
15 RX J0954.5+4723 X 09 54 31.8 +47 23 18   20.5       ~ 2 0
16 RX J0954.6+4733 X 09 54 40.1 +47 33 47   20.4       ~ 2 0
17 RX J0954.6+4726 X 09 54 40.4 +47 26 20   20.5       ~ 2 0
18 RX J0954.7+4801 X 09 54 47.1 +48 01 19   11.5       ~ 2 0
19 RX J0954.8+4715 X 09 54 53.7 +47 15 51   20.5       ~ 2 0
20 RX J0955.0+4720 X 09 55 02.2 +47 20 13   20.21       ~ 2 0
21 RX J0955.1+4709 X 09 55 06.3 +47 09 40   20.5       ~ 2 0
22 [VV98] J095506.9+472907 QSO 09 55 06.8861638992 +47 29 08.861721612   19.61 19.46     ~ 11 0
23 [VV2006] J095519.1+473425 QSO 09 55 19.0731788880 +47 34 15.445670376   20.06 19.97     ~ 10 1
24 RX J0955.5+4735 X 09 55 30.2 +47 35 39   19.9       ~ 2 0
25 RX J0955.5+4756 X 09 55 34.2 +47 56 21   18.7       ~ 2 0
26 RX J0955.5+4753 X 09 55 34.9 +47 53 25   15.9       ~ 2 0
27 RX J0955.6+4733 X 09 55 36.4 +47 33 34   19.2       ~ 2 0
28 RX J0955.6+4751 X 09 55 38.0 +47 51 24   20.5       ~ 2 0
29 RX J0955.6+4721 X 09 55 38.8 +47 21 56   20.5       ~ 2 0
30 RX J0955.6+4713 X 09 55 41.4 +47 13 10   20.5       ~ 2 0
31 RX J0955.7+4709 X 09 55 46.5 +47 09 37   20.5       ~ 2 0
32 RX J0955.7+4736 X 09 55 48.0 +47 36 46   20.5       ~ 2 0
33 RX J0955.8+4721 X 09 55 49.9 +47 21 05   20.5       ~ 2 0
34 RX J0955.9+4726 X 09 55 58.2 +47 26 31   20.5       ~ 2 0
35 RX J0956.0+4714 X 09 56 01.6 +47 14 10   19.0       ~ 2 0
36 RX J0956.0+4738 X 09 56 02.1 +47 38 34   21.5       ~ 2 0
37 RX J0956.0+4708 Sy1 09 56 03.6207098136 +47 08 10.841565372   20.5       ~ 10 0
38 RX J0956.1+4741 X 09 56 08.9 +47 41 26   20.5       ~ 2 0
39 [VV2006] J095616.2+471649 QSO 09 56 16.1245029552 +47 16 49.174435812   19.88 19.63     ~ 10 0
40 RX J0956.2+4738 X 09 56 16.3 +47 38 39   20.5       ~ 2 0
41 QSO B0953+47 QSO 09 56 25.1645972520 +47 34 42.468198132     19.47     ~ 66 1
42 RX J0956.4+4710 X 09 56 28.8 +47 10 14   21.5       ~ 2 0
43 RX J0956.6+4734 X 09 56 39.1 +47 34 52   20.5       ~ 3 0
44 RX J0956.6+4717 X 09 56 40.1 +47 17 05   16.8       ~ 2 0
45 RX J0956.7+4729 X 09 56 46.4 +47 29 17   11.5       ~ 2 0
46 RX J0956.8+4743 X 09 56 52.1 +47 43 44   20.5       ~ 2 0
47 RX J0956.9+4746 X 09 56 54.0 +47 46 40   20.5       ~ 2 0
48 RX J0956.9+4731 X 09 56 55.7 +47 31 18   20.5       ~ 2 0
49 RX J0956.9+4759 X 09 56 56.1 +47 59 11   20.5       ~ 2 0
50 RX J0957.1+4727 X 09 57 07.3 +47 27 13   20.5       ~ 2 0
51 RX J0957.2+4758 X 09 57 12.8 +47 58 57   20.5       ~ 2 0
52 RX J0957.3+4729 X 09 57 19.3 +47 29 00   20.5       ~ 2 0
53 RX J0957.3+4746 X 09 57 22.4 +47 46 22   19.7       ~ 2 0
54 RX J0957.4+4746 X 09 57 29.8 +47 46 15   20.1       ~ 2 0
55 RX J0957.5+4741 X 09 57 32.3 +47 41 46   20.5       ~ 2 0
56 RX J0957.5+4734 X 09 57 34.1 +47 34 32   19.8       ~ 2 0
57 RX J0957.6+4716 X 09 57 37.2 +47 16 31   20.5       ~ 2 0
58 [VV98] J095738.3+480122 QSO 09 57 38.4498430656 +48 01 22.059974892   19.65 19.65     ~ 12 0
59 RX J0957.6+4801 X 09 57 38.5 +48 01 22   18.6       ~ 2 0
60 RX J0957.7+4736 X 09 57 43.5 +47 36 17   16.5       ~ 2 0
61 SDSS J095746.55+474549.3 BLL 09 57 46.5601709112 +47 45 49.329882612     20.4     ~ 20 1
62 RX J0957.7+4745 X 09 57 46.7 +47 45 43   20.43       ~ 3 0
63 RX J0957.8+4713 X 09 57 50.5 +47 13 12   20.5       ~ 2 0
64 RX J0957.8+4756 X 09 57 53.4 +47 56 21   20.5       ~ 2 0
65 RX J0958.0+4737 Bla 09 58 00.6154571007 +47 37 34.577370684           ~ 4 0
66 RX J0958.0+4746 X 09 58 02.2 +47 46 23   11.7       ~ 2 0
67 RX J0958.0+4728 X 09 58 02.4 +47 28 56   21.5       ~ 2 0
68 RX J0958.2+4742 X 09 58 16.9 +47 42 17   21.5       ~ 2 0
69 US 1139 Bla 09 58 19.67164698 +47 25 07.8424065   18.78 18.62 18.39   ~ 264 1
70 [VV2006] J095828.3+473959 QSO 09 58 28.2578027760 +47 39 59.664239676   20.03 19.54     ~ 11 0
71 RX J0958.5+4742 X 09 58 31.5 +47 42 18   21.5       ~ 2 0
72 QSO B0955+4753 QSO 09 58 33.4444170936 +47 38 54.883426776   18.70 18.64     ~ 37 0
73 RX J0958.7+4800 X 09 58 47.1 +48 00 18   20.5       ~ 2 0
74 RX J0958.8+4744 X 09 58 50.1 +47 44 13           ~ 2 0
75 RX J0958.8+4719 X 09 58 50.5 +47 19 58   19.1       ~ 2 0
76 RX J0958.8+4715 X 09 58 52.3 +47 15 12   14.6       ~ 2 0
77 Z 239-48 LSB 09 58 53.4396828504 +47 44 12.874722000   14.4       ~ 64 0
78 RX J0958.8+4801 X 09 58 54.0 +48 01 03   20.5       ~ 2 0
79 RX J0958.9+4721 X 09 58 54.7 +47 21 13   20.5       ~ 2 0
80 BD+48 1823 SB* 09 58 56.9913643608 +47 45 35.138334528   10.12 9.67     F8 13 0

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