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J/AJ/128/1501         CLASXS: X-ray catalog                        (Yang+, 2004)

The Chandra Large Area Synoptic X-ray Survey (CLASXS) of the Lockman Hole-Northwest: the X-ray catalog. Yang Y., Mushotzky R.F., Steffen A.T., Barger A.J., Cowie L.L. <Astron. J., 128, 1501-1523 (2004)> =2004AJ....128.1501Y
ADC_Keywords: X-ray sources ; Active gal. nuclei Mission_Name: Chandra Keywords: cosmology: observations - galaxies: active - X-rays: diffuse background Abstract: We present the X-ray catalog and basic results from our Chandra Large Area Synoptic X-ray Survey (CLASXS) of the Lockman Hole-Northwest (LHNW) field. Our nine ACIS-I fields cover a contiguous solid angle of 0.4°2 and reach fluxes of 5x10-16ergs/cm2/s (0.4-2keV) and 3x10-15ergs/cm2/s (2-8keV). Our survey bridges the gap between ultradeep pencil-beam surveys, such as the Chandra Deep Fields (CDFs), and shallower, large-area surveys, allowing a better probe of the X-ray sources that contribute most of the 2-10keV cosmic X-ray background (CXB). We find a total of 525 X-ray point sources and four extended sources. Description: Fields LHNW1-3 were observed during 2001 April 30-May 17, and the rest of the fields were observed during 2002 April 29-May 4. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 127 525 Main Chandra Catalog: Basic Source Properties table3.dat 104 525 Main Chandra Catalog: Additional Source Properties
See also: J/AJ/128/1483 : Optical properties of the CLASXS X-ray sample (Steffen+, 2004) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- CLASXS Source identification number (1) 5- 20 A16 --- CXCCLASXS Source name (2) 22- 23 I2 h RAh Hour of right ascension (J2000) 25- 26 I2 min RAm Minute of right ascension (J2000) 28- 32 F5.2 s RAs Second of right ascension (J2000) 34 A1 --- DE- Sign of the declination (J2000) 35- 36 I2 deg DEd Degree of declination (J2000) 38- 39 I2 arcmin DEm Arcminute of declination (J2000) 41- 44 F4.1 arcsec DEs Arcsecond of declination (J2000) 46- 50 F5.3 arcsec e_RAs Statistical error in RAs 52- 56 F5.3 arcsec e_DEs Statistical error in DEs 58 A1 --- l_Soft Limit flag on Soft 59- 64 F6.3 aW/m2 Soft The 0.4-2.0keV band flux (3) 66- 70 F5.3 aW/m2 E_Soft ? The upper 1σ Poisson error on Soft 72- 75 F4.2 aW/m2 e_Soft ? The lower 1σ Poisson error on Soft 77 A1 --- l_Hard Limit flag on Hard 78- 85 F8.4 aW/m2 Hard The 2.0-8.0keV band flux (3) 87- 90 F4.2 aW/m2 E_Hard ? The upper 1σ Poisson error on Hard 92- 96 F5.2 aW/m2 e_Hard ? The lower 1σ Poisson error on Hard 98 A1 --- l_Full Limit flag on Full 99-104 F6.2 aW/m2 Full The 0.4-8.0keV band flux (3) 106-110 F5.2 aW/m2 E_Full ? The upper 1σ Poisson error on Full 112-116 F5.2 aW/m2 e_Full ? The lower 1σ Poisson error on Full 118 A1 --- l_HR Limit flag on HR 120-126 F7.3 --- HR Hardness ratio (4)
Note (1): The numbers correspond to ascending order of right ascension. Note (2): Source name follows the IAU convention and should read CXCCLASXS, plus the name given in the table. Note (3): In units of 10-15ergs/cm2/s. If a source is detected in multiple observations, and if there is more than one observation in which the source effective area is more than 80% of the effective area at the aim point, then the mean flux is used; otherwise, the flux from the observation that has the largest effective area is used. The errors quoted are the 1σ upper and lower Poisson errors, using the approximations from Gehrels (1986ApJ...303..336G). For any source detected in one band but with a very weak signal in another, the background- subtracted flux could be negative. In this case, only the upper Poisson error is quoted. Note (4): HR=CHard/CSoft, where CHard and CSoft are the count rates in the hard and soft bands.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- CLASXS Source identification number (1) 5 A1 --- l_Nsoft Limit flag on Nsoft 6- 12 F7.3 ct Nsoft Net 0.4-2.0keV band counts (2) 14- 18 F5.2 ct E_Nsoft ? The upper 1σ Poisson error on Nsoft 20- 25 F6.3 ct e_Nsoft ? The lower 1σ Poisson error on Nsoft 27 A1 --- l_Nhard Limit flag on Nhard 28- 35 F8.4 ct Nhard Net 2.0-8.0keV band counts (2) 37- 41 F5.2 ct E_Nhard ? The upper 1σ Poisson error on Nhard 43- 49 F7.4 ct e_Nhard ? The lower 1σ Poisson error on Nhard 51 A1 --- l_Nfull Limit flag on Nfull 52- 57 F6.2 ct Nfull Net 0.4-8.0keV band counts (2) 59- 63 F5.2 ct E_Nfull ? The upper 1σ Poisson error on Nfull 65- 69 F5.2 ct e_Nfull ? The lower 1σ Poisson error on Nfull 71- 78 E8.3 s Tsoft Effective 0.4-2.0keV band exposure time 80- 87 E8.3 s Thard Effective 2.0-8.0keV band exposure time 89- 96 E8.3 s Tfull Effective 0.4-8.0keV band exposure time 98 I1 --- FNum LHNW field number where the source has the largest effective area 100-103 I4 --- Det The LHNW field detection numbers (3)
Note (1): The numbers correspond to ascending order of right ascension. Note (2): If a source is detected in multiple observations, then the observation in which the source has the largest effective area is used. As in Table 2, for the sources with negative counts, only the upper limits are listed. Note (3): Each digit represents a field number of the Lockman Hole-NorthWest
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 17-Feb-2005
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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