J/AJ/127/2579 Optical ident. of BATC Sky Survey X-ray sources (Zhang+, 2004)
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.,
Zou Z.
<Astron. J., 127, 2579-2597 (2004)>
=2004AJ....127.2579Z 2004AJ....127.2579Z
ADC_Keywords: X-ray sources ; Surveys ; Cross identifications
Keywords: catalogs - galaxies: active - surveys - X-rays
Abstract:
We present optical candidates for 75 X-ray sources in a 1deg2
overlapping region with the 1997 medium-deep ROSAT survey by Molthagen
et al. (1996, Cat. J/A+AS/126/509). 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 0.6/0.9m Schmidt telescope with 15 intermediate-band
filters covering the wavelength range 3360-9745Å. These X-ray
sources are relatively faint (CR≪0.2ct/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 (1998, J/A+AS/128/507
and 1999, J/A+AS/134/483).
Description:
Optical observations of BATC field T329 were carried out from 1996 to
1999 as part of the BATC Survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 150 157 X-ray sources and optical identifications in a
1 square degree field
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See also:
II/262 : BATC Data Release One - BATC DR1 (Zhou+ 1995-2005)
J/A+AS/126/509 : HS 47.5/22: X-ray catalogue (Molthagen+ 1997)
J/A+AS/128/507 : The Hamburg Quasar Survey. II. (Engels+ 1998)
J/A+AS/134/483 : The Hamburg Quasar Survey. III. (Hagen+ 1999)
Table 1: Optical Observation Log.
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Filter Lambda Frames Exposure Calib Limiting magnitude
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a 3360 7 03:04 1 22.13
b 3890 12 03:44 1 22.56
c 4210 19 08:45 7 23.23
d 4550 35 09:58 5 23.68
e 4920 29 03:04 10 22.83
f 5270 25 06:00 5 23.22
g 5795 30 06:54 5 22.83
h 6075 21 04:44 3 22.85
i 6660 31 05:49 10 22.61
j 7050 27 06:53 5 22.55
k 7490 22 05:52 22 21.91
m 8020 22 06:50 6 22.07
n 8480 12 04:50 3 21.34
o 9190 13 04:41 1 20.81
p 9745 12 05:00 2 20.24
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- RXJ ROSAT source
17- 20 F4.1 10-2ct/s CR Brightness in the 0.1-2.4keV passband
22- 23 I2 arcsec Xerr Radial position uncertainty of X-ray detection
25- 32 A8 --- OClass Old classification (1)
34- 37 A4 --- Obj Object label for associated optical object (2)
39- 40 I2 h RAh Associated optical object Right ascension, J2000
42- 43 I2 min RAm Associated optical object Right ascension, J2000
45- 49 F5.2 s RAs Associated optical object Right ascension, J2000
51 A1 --- DE- Associated optical object Declination sign, J2000
52- 53 I2 deg DEd Associated optical object Declination, J2000
55- 56 I2 arcmin DEm Associated optical object Declination, J2000
58- 61 F4.1 arcsec DEs Associated optical object Declination, J2000
63- 67 F5.2 arcsec Deltar ? Distance of the identified optical source to
the center of X-ray detection
69 A1 --- l_Vmag Limit flag on Vmag
70- 74 F5.2 mag Vmag V magnitude measure on our images (3)
76 A1 --- l_fXO Limit flag on fXO
77- 81 F5.2 --- fXO Ratio of X-ray (0.1-2.4keV) to optical (V) fluxes
83- 86 F4.2 --- z ? Predicted redshift for all nonstellar objects
88-150 A63 --- Class New object classification based on the SED
information (4)
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Note (1): Preliminary identification based on HQS plates (Molthagen,
Wendker & Briel, 1997, Cat. J/A+AS/126/509), as follows:
D = visible on the HQS direct plate only
AGN = known AGN
AGN cand = AGN candidate (classified as AGN or extremely blue)
Sat. = saturated objective prism spectrum (mostly stars)
FG/M cand = FG or M star candidate
Gal cand = galaxy candidate
Red = object with very weak and red objective prism spectrum
St. cand = star-like on HQS plates (no further distinction possible)
Star = known stars
Unid. = unidentified object
Empty = empty fields on the HQS direct plate
Note (2): Sources with fluxes on more than a few passbands are labeled
a, b, c, ..., for association with each X-ray detection.
R: known radio source, found by cross-comparing with the FIRST catalog
(http://sundog.stsci.edu/first/catalogs/catalog_01oct15.bin.gz,
Cat. VIII/71), NED and SIMBAD; radio ID given in last column
according to FIRST and NED definitions.
V: visible only in some direct images.
E: no source found in X-ray error circle.
Note (3): If no detection, an upper limit is given;
if saturated star, a lower limit is given.
The V magnitude is derived from the relation:
mV=mg+0.3233(mf-mh)+0.0590
(Zhou et al., 2003, Cat. J/A+A/397/361)
Note (4): IDs taken from NED and SIMBAD; see Fig. 2 and text
for other definitions. An asterisk before the classification
indicates the most likely X-ray source.
i indicates redshift as obtained from the following sources:
RX J0955.1+4729(e), RX J0955.3+4733(d), RX J0956.3+4716(a),
RX J0957.3+4729(b), RX J0957.6+4801(a), RX J0958.3+4725(a),
RX J0958.4+4739(b), RX J0958.5+4738(a), RX J0958.8+4744(a);
this paper, Fig. 10;
RX J0955.0+4720(a), RX J0957.7+4745(a);
Molthagen et al., 1997, Cat. J/A+AS/126/509.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Jul-2004