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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 150 157 X-ray sources and optical identifications in a 1 square degree field
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. ----------------------------------------------------------------------------- Filter Lambda Frames Exposure Calib Limiting magnitude ----------------------------------------------------------------------------- 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 Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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)
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.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Jul-2004
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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