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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 127 525 Main Chandra Catalog: Basic Source Properties
table3.dat 104 525 Main Chandra Catalog: Additional Source
Properties
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See also:
J/AJ/128/1483 : Optical properties of the CLASXS X-ray sample (Steffen+, 2004)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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)
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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 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.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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)
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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
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 17-Feb-2005