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J/AJ/122/2810 Chandra Deep Field North Survey. V. (Brandt+, 2001)
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The Chandra Deep Field North survey. V. 1 Ms source catalogs.
Brandt W.N., Alexander D.M., Hornschemeier A.E., Garmire G.P.,
Schneider D.P., Barger A.J., Bauer F.E., Broos P.S., Cowie L.L.,
Townsley L.K., Burrows D.N., Chartas G., Feigelson E.D., Griffiths R.E.,
Nousek J.A., Sargent W.L.W.
<Astron. J. 122, 2810 (2001)>
=2001AJ....122.2810B (SIMBAD/NED BibCode)
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ADC_Keywords: Surveys ; X-ray sources
Keywords: catalogs - cosmology: observations - galaxies: active -
galaxies: general - galaxies: nuclei - surveys - X-rays
Abstract:
An extremely deep X-ray survey (~1Ms) of the Hubble Deep Field North
(HDF-N) and its environs (~450arcmin^2^) has been performed with the
Advanced CCD Imaging Spectrometer (ACIS) on board the Chandra X-Ray
Observatory. This is one of the two deepest X-ray surveys ever
performed; for point sources near the aim point, it reaches 0.5-2.0
and 2-8keV flux limits of ~3x10^-17^ and ~2x10^-16^ergs/cm^2^/s,
respectively. Here we provide source catalogs, along with details of
the observations, data reduction, and technical analysis. Observing
conditions, such as background, were excellent for almost all of the
exposure. We have detected 370 distinct point sources: 360 in the
0.5-8.0keV band, 325 in the 0.5-2.0keV band, 265 in the 2-8keV band,
and 145 in the 4-8keV band. Two new Chandra sources in the HDF-N
itself are reported and discussed. Source positions are accurate to
within 0.6"-1.7" (at ~90% confidence), depending mainly on the
off-axis angle. We also detect two highly significant extended X-ray
sources and several other likely extended X-ray sources. We present
basic number count results for sources located near the center of the
field. Source densities of 7100^+1100^_-940_deg^-2^ (at
4.2x10^-17^ergs/cm^2^/s) and 4200^+670^_580_deg^-2^ (at
3.8x10^-16^ergs/cm^2^/s) are observed in the soft and hard bands,
respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 162 370 Main Chandra Point-Source Catalog
table6.dat 161 11 Supplementary Chandra point-source catalog
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See also:
J/ApJS/139/369 : Chandra Deep Field South. 1 Ms catalog (Giacconi+, 2002)
J/ApJ/554/742 : Chandra Deep Survey of the HDF-N (Hornschemeier+, 2001)
Byte-by-byte Description of file: table3.dat table6.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- BAH2001 Source number (1-370, S1-S11) (1)
5- 6 I2 h RAh Hour of Right Ascension (J2000)
8- 9 I2 min RAm Minute of Right Ascension (J2000)
11- 15 F5.2 s RAs Second of Right Ascension (J2000)
16 A1 --- DE- Sign of Declination (J2000)
17- 19 I3 deg DEd Degree of Declination (J2000)
21- 22 I2 arcmin DEm Arcminute of Declination (J2000)
24- 27 F4.1 arcsec DEs Arcsecond of Declination (J2000)
29- 31 F3.1 arcsec PosErr Positional error
33 A1 --- l_FB Limit flag on FB
34- 39 F6.1 ct FB Full band counts (2)
41- 44 F4.1 ct e_FB ? The 1{sigma} statistical error in FB
46- 47 A2 --- f_FB [abc ] Flag on FB (3)
49 A1 --- l_SB Limit flag on SB
50- 55 F6.1 ct SB Soft band (0.5-2keV ) counts (2)
57- 60 F4.1 ct e_SB ? The 1{sigma} statistical error in SB
62- 63 A2 --- f_SB [abc ] Flag on SB (3)
65 A1 --- l_HB Limit flag on HB
66- 71 F6.1 ct HB Hard band (2-8keV) counts (2)
73- 76 F4.1 ct e_HB ? The 1{sigma} statistical error in HB
78- 79 A2 --- f_HB [abc ] Flag on HB (3)
81 A1 --- l_UHB Limit flag on UHB
82- 86 F5.1 ct UHB Ultrahard band (4-8keV) counts (2)
88- 91 F4.1 ct e_UHB ? The 1{sigma} statistical error in UHB
93- 94 A2 --- f_UHB [abc ] Flag on UHB (3)
96 A1 --- l_Ratio Limit flag on Ratio
97-100 F4.2 --- Ratio ? Hardness band ratio (4)
102-106 F5.2 --- Eup_Ratio ? Upper limit error on Ratio
108-111 F4.2 --- Elo_Ratio ? Lower limit error on Ratio
113 A1 --- l_Sp+Index Limit flag on Sp+Index
114-118 F5.2 --- Sp+Index Effective photon index (5)
120 A1 --- f_Sp+Index [d] Indicates Sp+Index set to given value
due to low number of counts
122-126 F5.1 ks Exp Effective exposure time
128 A1 --- l_FFB Limit flag on FFB
129-134 F6.2 10-15mW/m2 FFB Full band (0.5-8keV) observed-frame flux
in units of 10^-15^ erg/cm^2^/s (6)
136 A1 --- l_FSB Limit flag on FSB
137-141 F5.2 10-15mW/m2 FSB Soft band (0.5-2keV) observed-frame flux
in units of 10^-15^ erg/cm^2^/s (6)
143 A1 --- l_FHB Limit flag on FHB
144-149 F6.2 10-15mW/m2 FHB Hard band (2-8keV) observed-frame flux in
units of 10^-15^ erg/cm^2^/s (6)
151 A1 --- l_FUHB Limit flag on FUHB
152-156 F5.2 10-15mW/m2 FUHB Ultrahard band (4-8keV) observed-frame
flux in units of 10^-15^ erg/cm^2^/s (6)
158-161 A4 --- Note Source notes (7)
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Note (1): [BAH2001] NNN = CXOHDFN JHHMMSS.s+DDMMSS;
[BAH2001] SNN = CXOHDFN JHHMMSS.s+DDMMSS> N=11.
Note (2): Not corrected for vignetting and calculated using circular aperture
photometry. The circular aperture was centered at the position given
for all bands. A source-free local background has been subtracted,
and unexposed regions were masked.
Note (3):
a = Source was detected with the restricted ACIS grade set with a
probability threshold of 10^-7^.
b = Source was detected with the standard ASCA grade set with a
probability threshold of 10^-5^.
c = Source positional offset >2.5'' from the primary source position.
d = Photon index set to given value due to low number of counts
Note (4): Defined as the ratio of of hard-band counts to soft-band counts.
Note (5): For a power-law model with the Galactic column density.
Note (6): Corrected for vignetting but not corrected for absorption by
the Galaxy or intrinsic to the source.
Note (7):
H = Object lying in the HDF-N area;
C = Object lying in the Caltech area;
O = Object that has large cross-band positional offsets ( >2.5'');
np = Object where the source position could not be updated to that from
a no-PSF run;
M = Source where the photometry was performed manually;
S = Close double source where manual separation was required.
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History:
From electronic version of the journal
References:
Hornschemeier et al., Paper I 2000ApJ...541...49H
Hornschemeier et al., Paper II 2001ApJ...554..742H, Cat. <J/ApJ/554/742>
Garmire et al., Paper III 2002, ApJ submitted
Brandt et al., Paper IV 2001AJ....122....1B
Alexander et al., Paper VI 2001AJ....122.2156A
Brandt et al., Paper VII 2001ApJ...558L...5B
Bauer et al., Paper IX 2001AJ....122..182B
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(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 22-Jan-2002