J/A+A/488/1221 BMW-Chandra source catalog (Romano+, 2008)
The Brera Multi-scale Wavelet Chandra Survey. I.
Serendipitous source catalogue.
Romano P., Campana S., Mignani R.P., Moretti A., Mottini M., Panzera M.R.,
Tagliaferri G.
<Astron. Astrophys. 488, 1221 (2008)>
=2008A&A...488.1221R 2008A&A...488.1221R
ADC_Keywords: Surveys ; X-ray sources
Keywords: catalogs - X-rays: general
Abstract:
We present the BMW-Chandra source catalogue drawn from essentially all
Chandra ACIS-I pointed observations with an exposure time in excess of
10ks public as of March 2003 (136 observations). Using the wavelet
detection algorithm developed by Lazzati et al. (1999ApJ...524..414)
and Campana et al. (1999ApJ...524..423C 1999ApJ...524..423C), which can characterise both
point-like and extended sources, we identified 21325 sources. Among
them, 16758 are serendipitous, i.e. not associated with the targets of
the pointings, and do not require a non-automated analysis. This makes
our catalogue the largest compilation of Chandra sources to date. The
0.5-10keV absorption corrected fluxes of these sources range from
∼3x10-16 to 9x10-12erg/cm2/s with a median of
7x10-15erg/cm2/s.
Description:
The catalogue consists of count rates and relative errors in three
energy bands (total, 0.5-7keV; soft, 0.5-2keV; and hard, 2-7keV), and
source positions relative to the highest signal-to-noise detection
among the three bands. The wavelet algorithm also provides an estimate
of the extension of the source. We include information drawn from the
headers of the original files, as well, and extracted source counts in
four additional energy bands, SB1 (0.5-1keV), SB2 (1-2keV), HB1
(2-4keV), and HB2 (4-7keV). We computed the sky coverage for the full
catalogue and for a subset at high Galactic latitude (|b|>20deg). The
complete catalogue provides a sky coverage in the soft band (0.5-2keV,
S/N=3) of ∼8deg2 at a limiting flux of 10-13erg/cm^2/s, and
∼2deg2 at a limiting flux of ∼10-15erg/cm^2/s. Furthermore, we
present the results of the cross-match with existing catalogues at
different wavelengths (FIRST, IRAS, 2MASS, GSC2, and ChaMP). The total
numbers of matches with the FIRST, IRASPSC, 2MASS, and GSC2 catalogues
obtained after a closest-distance selection are 13, 87, 6700, and
4485, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 847 21325 BMW-Chandra catalogue
BMC1.0.1AA.FITS 2880 3284 Fits version of the catalog
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-)
http://www.brera.inaf.it/BMC/bmc_home.html : BMC Home Page
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Source unique number
7- 10 A4 --- --- [1BMC]
11- 25 A15 --- 1BMC Source IAU Name (HHMMSS.s+DDMMSS, J2000)
27- 32 I6 --- ObsNum Observation Sequence Number
34- 48 A15 --- Target Target Name
50- 53 I4 --- ObsID Observation ID number of the Target
55- 66 F12.5 s ExpTime Total exposure time
68- 74 F7.5 s ExpTime1 Commanded exposure time
76- 87 A12 --- ASCDSVer ASCDS version number
89-108 A20 "datime" ObsStart Date and time of observation start
110-129 A20 "datime" ObsEnd Date and time of observation stop
131-139 F9.5 deg RATdeg Nominal Target RA (J2000)
141-149 F9.5 deg DETdeg Nominal Target DEC (J2000)
151-158 A8 --- ObsMode [POINTING] Observation Mode
160-165 A6 --- DataMode Data Mode (FAINT or VFAINT)
167-171 A5 --- ReadMode [TIMED] Read Mode
173-184 F12.5 s EffTime Effective time
186-192 F7.5 ct/pix Tbg Total-band (0.5-7keV) mean background
194-200 F7.5 ct/pix Sbg Soft-band (0.5-2keV) mean background
202-208 F7.5 ct/pix Hbg Hard-band (2-7keV) mean background
210-220 E11.3 cm-2 NH Weighted averaged NH at position
222-233 E12.3 mJ/m2/ct CORFAC1 Count in (0.5-7keV) vs Flux in (0.5-10keV)
235-236 I2 h RAh Source right ascension (J2000)
238-239 I2 min RAm Source right ascension (J2000)
241-246 F6.3 s RAs Source right ascension (J2000)
248 A1 --- DE- Source declination sign (J2000)
249-250 I2 deg DEd Source declination (J2000)
252-253 I2 arcmin DEm Source declination (J2000)
255-259 F5.2 arcsec DEs Source declination (J2000)
261-272 F12.6 deg RAdeg Source right ascension (J2000, degrees)
274-284 F11.5 deg DEdeg Source declination (J2000, degrees)
286-297 F12.5 arcsec e_RAdeg Error on Source RA (arcsec)
299-310 F12.5 arcsec e_DEdeg Error on Source DEC (arcsec)
312-323 F12.5 arcsec e_Pos Total positional error (arcsec)
325-336 F12.5 arcsec Width Width of WT (Wavelet Transform) Gaussian
338-349 F12.5 arcsec e_Width Error on Width (arcsec)
351 I1 --- f_Width [0/1] Meaning of Width (1=fixed≡PSF)
353 I1 --- Scale [1/6] (WT) Scale at which source was found
355-364 F10.5 --- CHI2 Fit Chi-squared
366-373 F8.5 arcmin OffAxis Offaxis angle
375-384 F10.5 pix Xpos Source X-coordinate
386-395 F10.5 pix Ypos Source Y-coordinate
397-406 F10.5 ct TFct Total-band (0.5-7keV) counts from the fit
408-416 F9.5 ct e_TFct Total-band error on counts from fit
418-427 F10.5 ct TCct Total-band counted source counts
429-437 F9.5 ct TCbg Total-band counted background counts
439-445 F7.5 --- Tvig Total-band vignetting corr. factor
447-454 F8.5 --- Tpsf Total-band PSF corr. factor
456-462 F7.5 ct/s Tcrate Total-band count rate
464-470 F7.5 ct/s e_Tcrate Total-band count rate error
472-482 E11.3 mW/m2 Tflux Total-band Flux
484-493 F10.5 --- Tsnr Total-band SNR of the detection
495-505 F11.5 --- Tsnr.wt Total-band SNR in wavelet space
507-516 F10.5 ct SFct Soft-band (0.5-2keV) counts from the fit
518-527 F10.5 ct e_SFct Soft-band error on counts from fit
529-538 F10.5 ct SCct Soft-band counted source counts
540-547 F8.5 ct SCbg Soft-band counted background counts
549-560 F12.5 --- Svig Soft-band vignetting corr. factor
562-568 F7.5 --- Spsf Soft-band PSF corr. factor
570-576 F7.5 ct/s Scrate Soft-band count rate
578-584 F7.5 ct/s e_Scrate Soft-band count rate error
586-596 E11.3 mW/m2 Sflux Soft-band Flux
598-605 F8.5 --- Ssnr Soft-band SNR of the detection
607-617 F11.5 --- Ssnr.wt Soft-band SNR in wavelet space
619-628 F10.5 ct HFct Hard-band (2-7keV) counts from the fit
630-638 F9.5 ct e_HFct Hard-band error on counts from the fit
640-649 F10.5 ct HCct Hard-band counted source counts
651-659 F9.5 ct HCbg Hard-band counted background counts
661-667 F7.5 --- Hvig Hard-band vignetting correction factor
669-675 F7.5 --- Hpsf Hard-band PSF correction factor
677-683 F7.5 ct/s Hcrate Hard-band count rate
685-691 F7.5 ct/s e_Hcrate Hard-band count rate error
693-703 E11.3 mW/m2 Hflux Hard-band Flux
705-712 F8.5 --- Hsnr Hard-band SNR of the detection
714-724 F11.5 --- Hsnr.wt Hard-band SNR in wavelet space
726 I1 --- bin [1/2] Rebin source was found
728-735 F8.5 --- WTProb WT Probability (confidence level of source)
737-747 E11.5 mW/m2 Flux1 ?=0.0 Absorption-corrected 0.5-10keV Flux
749-759 E11.5 mW/m2 Flux2 ?=0.0 Flux in 0.5-10keV band
761-762 I2 --- qF1 [-3/1] Quality flag: 1=ok; ←1 decreasing
764-766 I3 --- qF2 [-30/10] -1 to inspect,←1 decr qual;
≥10 pointed
768-775 A8 --- Ext Flag: Extension (Point/Extended)
777-780 F4.2 arcsec Xrad1 [3.00] 1st cross-matching Radius
782 I1 --- f_Xrad1 [0/1] In merged catalogue? 1=yes, 0=no
784-787 F4.2 arcsec Xrad2 [4.50] 2nd cross-matching Radius
789 I1 --- f_Xrad2 [0/1] In merged catalogue? 1=yes, 0=no
791-799 A9 --- CatVer [BMC1.0.1F] Catalogue Version
801-811 F11.5 ct C0.5-1 ?=-9999.99023 0.5-1keV counted source counts
813-823 F11.5 ct C1-2 ?=-9999.99023 1-2keV counted source counts
825-835 F11.5 ct C2-4 ?=-9999.99023 2-4keV counted source counts
837-847 F11.5 ct C4-7 ?=-9999.99023 4-7keV counted source counts
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Acknowledgements:
Patrizia Romano, romano(at)ifc.inaf.it
(End) Patricia Vannier [CDS] 17-Sep-2008