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J/MNRAS/383/330    Chandra Small Magellanic Cloud Wing Survey   (McGowan+, 2008)

The Chandra Small Magellanic Cloud Wing Survey - the search for X-ray binaries. McGowan K.E., Coe M.J., Schurch M.P.E., McBride V.A., Galache J.L., Edge W.R.T., Corbet R.H.D., Laycock S., Buckley D.A.H. <Mon. Not. R. Astron. Soc., 383, 330-338 (2008)> =2008MNRAS.383..330M
ADC_Keywords: Magellanic Clouds ; X-ray sources Keywords: stars: emission-line, Be - Magellanic Clouds - X-rays: binaries Abstract: We have detected 523 sources in a survey of the Small Magellanic Cloud (SMC) Wing with Chandra. By cross-correlating the X-ray data with optical and near-infrared catalogues, we have found 300 matches. Using a technique that combines X-ray colours and X-ray to optical flux ratios, we have been able to assign preliminary classifications to 265 of the objects. Our identifications include four pulsars, one high-mass X-ray binary (HMXB) candidate, 34 stars and 185 active galactic nuclei (AGN). In addition, we have classified 32 sources as hard AGN which are likely absorbed by local gas and dust, and nine soft AGN whose nature is still unclear. Considering the abundance of HMXBs discovered so far in the Bar of the SMC the number that we have detected in the Wing is low. Description: Observations in the Wing of the SMC were made from 2005 July to 2006 March with Chandra. The survey consisted of 20 fields, with exposure times ranging from 8.6-10.3ks. X-ray parameters for 523 sources detected in the Wing of the Small Magellanic Cloud with Chandra are presented. For each source equatorial coordinates, positional error, net counts (total counts minus background counts) in the 0.5-8.0keV band, signal-to-noise of the detection and source flux in the 0.5-8.0keV band are given. The median, compressed median and normalized quartile ratio of the photon energy distribution, determined using quantile analysis, are given for sources with three or more counts. For the sources that have optical counterparts the V- and R-band magnitudes, B-V colour, X-ray to optical flux ratios based on the V- and R-band magnitudes, and a preliminary classification for the sources are given. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 106 523 The SMC Wing Survey catalogue
See also: J/A+AS/136/81 : A ROSAT PSPC X-Ray Survey of the SMC (Kahabka, 1999) J/A+AS/142/41 : SMC X-ray sources ROSAT PSPC catalogue (Haberl+, 2000) J/A+AS/147/75 : ROSAT HRI catalogue of SMC X-ray sources (Sasaki+, 2000) J/PASJ/55/161 : ASCA sources in the SMC (Yokogawa+, 2003) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [MCS2008] SMC Wing Survey catalogue number 5- 6 I2 h RAh X-ray Right Ascension J2000 (hours) 8- 9 I2 min RAm X-ray Right Ascension J2000 (minutes) 11- 15 F5.2 s RAs X-ray Right Ascension J2000 (seconds) 17 A1 --- DE- X-ray Declination J2000 (sign) 18- 19 I2 deg DEd X-ray Declination J2000 (degrees) 21- 22 I2 arcmin DEm X-ray Declination J2000 (minutes) 24- 27 F4.1 arcsec DEs X-ray Declination J2000 (seconds) 29- 33 F5.2 arcsec e_Pos Position mean error 35- 38 I4 ct Ncts Net counts 40- 44 F5.1 --- S/N Signal-to-noise 46- 51 F6.2 10-17W/m2 FX X-ray flux (0.5-8.0keV band, in 10-10erg/cm2/s) 53- 56 F4.2 keV m ? Median of photon energy distribution 58- 62 F5.2 --- log(m/(1-m)) ? Compressed median 64- 67 F4.2 --- 3Q25/Q75 ? Normalised quartile ratio of photon energy distribution 69- 72 F4.1 mag Vmag ? Magnitude (apparent) in V filter 74- 77 F4.1 mag Rmag ? Magnitude (apparent) in R filter 79- 84 F6.3 --- B-V ? B-V colour index 86- 93 E8.3 --- fXH/fV ? Ratio of hard (2-10keV) X-ray flux to V filter flux (1) 95- 99 F5.2 [-] log(fXS/fR) ? Ratio of soft (0.5-2 keV) X-ray flux to R filter flux (2) 101-106 A6 --- Class ? Classification of source (3)
Note (1): where fV=8x10-6x10(-Vmag/2.5) Note (2): where log(fXS/fR)=log(fXS)+5.50+Rmag/2.5 Note (3): where the source is classified as follows: star = star AGN = Active Galaxy Nucleus AGN h = hard AGN AGN s = soft AGN pulsar = pulsar HMXB? = High-Mass X-ray Binary candidate * = sources with optical matches that were not able to be classified
Acknowledgements: Katherine McGowan, kem(at)
(End) Patricia Vannier [CDS] 24-Apr-2008
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