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J/ApJS/193/31      M33 Chandra ACIS survey: final catalog      (Tullmann+, 2011)

The Chandra ACIS survey of M33 (ChASeM33): the final source catalog. Tullmann R., Gaetz T.J., Plucinsky P.P., Kuntz K.D., Williams B.F., Pietsch W., Haberl F., Long K.S., Blair W.P., Sasaki M., Winkler P.F., Challis P., Pannuti T.G., Edgar R.J., Helfand D.J., Hughes J.P., Kirshner R.P., Mazeh T., Shporer A. <Astrophys. J. Suppl. Ser., 193, 31 (2011)> =2011ApJS..193...31T
ADC_Keywords: Binaries, X-ray ; Galaxies, nearby ; Cross identifications ; Surveys Keywords: binaries: general - galaxies: individual (M33) - ISM: supernova remnants - surveys - X-rays: galaxies Abstract: This study presents the final source catalog of the Chandra ACIS Survey of M33 (ChASeM33). With a total exposure time of 1.4Ms, ChASeM33 covers ∼70% of the D25 isophote (R∼4.0kpc) of M33 and provides the deepest, most complete, and detailed look at a spiral galaxy in X-rays. The source catalog includes 662 sources, reaches a limiting unabsorbed luminosity of ∼2.4x1034erg/s in the 0.35-8.0keV energy band, and contains source positions, source net counts, fluxes and significances in several energy bands, and information on source variability. To constrain the nature of the detected X-ray source, hardness ratios were constructed and spectra were fit for 254 sources, follow-up MMT spectra of 116 sources were acquired, and cross-correlations with previous X-ray catalogs and other multi-wavelength data were generated. Based on this effort, 183 of the 662 ChASeM33 sources could be identified. Finally, the luminosity function (LF) for the detected point sources as well as the one for the X-ray binaries (XRBs) in M33 is presented. The resulting distribution is consistent with a dominant population of high-mass XRBs as would be expected for M33. Description: The results presented here use the full survey data obtained during 2005 September to 2006 November. All observations were performed with ACIS-I as the primary instrument. In addition to the ChASeM33 observations, we also utilized two archival ACIS-I observations of M33 (ObsIDs 1730 and 2023) obtained in 2000 July 12 and 2001 July 6. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 81 662 ChASeM33 source list table4.dat 75 662 Merged pns values for different energy bands table5.dat 167 662 Total net counts in the counts in different energy bands table6.dat 81 662 Merged photon flux in different energy bands table7.dat 155 254 Best-fit results for sources with 8 or more spectral groups table9.dat 156 662 Cross-referenced source list
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) J/ApJS/187/495 : SNRs in M33 from optical and X-ray (Long+, 2010) J/ApJS/174/366 : Chandra ACIS survey of M33 (ChaSeM33) (Plucinsky+, 2008) J/A+A/448/1247 : XMM-Newton survey of M33 (Misanovic+, 2006) J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006) J/ApJS/161/271 : The X-ray binary population in M33. I (Grimm+, 2005) J/A+A/426/11 : XMM-Newton survey of M33 (Pietsch+, 2004) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Source number 5- 22 A18 --- Name Source identifier (HHMMSS.ss+DDMMSS.s; J2000) 24- 32 F9.6 deg RAdeg Right Ascension in decimal degrees (J2000) 34- 41 F8.5 deg DEdeg Declination in decimal degrees (J2000) 43- 46 F4.2 arcsec ePos Positional error 48- 49 I2 --- Nobs Number of observations 51- 56 I6 s Exp Total exposure in all observations 58- 66 E9.3 s.cm2 Expmap Total exposure map value (1) 68- 71 F4.1 pix Rsrc Average source radius in sky pixels (2) 73- 76 F4.1 pix Rbkg Average background radius in sky pixels (2) 78- 81 F4.1 arcmin theta Average off-axis angle
Note (1): Sum of mean exposure map values in source region for all observations. Note (2): 1 sky pixel = 0.492".
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Source number 5 A1 --- l_pns1 Limit flag on pns1 6- 12 E7.1 --- pns1 Poisson probability of not being a source in the 0.5-8.0keV energy band (1) 14 A1 --- l_pns2 Limit flag on pns2 15- 21 E7.1 --- pns2 Poisson probability of not being a source in the 0.5-2.0keV energy band (1) 23 A1 --- l_pns3 Limit flag on pns3 24- 30 E7.1 --- pns3 Poisson probability of not being a source in the 2.0-8.0keV energy band (1) 32 A1 --- l_pns4 Limit flag on pns4 33- 39 E7.1 --- pns4 Poisson probability of not being a source in the 0.35-8.0keV energy band (1) 41 A1 --- l_pns5 Limit flag on pns5 42- 48 E7.1 --- pns5 Poisson probability of not being a source in the 0.35-1.1keV energy band (1) 50 A1 --- l_pns6 Limit flag on pns6 51- 57 E7.1 --- pns6 Poisson probability of not being a source in the 1.1-2.6keV energy band (1) 59 A1 --- l_pns7 Limit flag on pns7 60- 66 E7.1 --- pns7 Poisson probability of not being a source in the 2.6-8.0keV energy band (1) 68 A1 --- l_pns8 Limit flag on pns8 69- 75 E7.1 --- pns8 Poisson probability of not being a source in the 0.35-2.0keV energy band (1)
Note (1): pns values smaller than 1.0e-10 have been replaced by <1.0e-10. All these cases are highly significant detections.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Source number 5- 12 F8.1 ct Ncts1 Total net counts in the 0.5-8.0keV energy band 14- 18 F5.1 ct E_Ncts1 The upper 90% confidence level in Ncts1 20- 24 F5.1
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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