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J/AJ/122/2810       Chandra Deep Field North Survey. V.      (Brandt+, 2001)

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
ADC_Keywords: Surveys ; X-ray sources Mission_Name: Chandra 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 (∼450arcmin2) 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 ∼2x10-16ergs/cm2/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+1100-940deg-2 (at 4.2x10-17ergs/cm2/s) and 4200+670580deg-2 (at 3.8x10-16ergs/cm2/s) are observed in the soft and hard bands, respectively. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 162 370 Main Chandra Point-Source Catalog table6.dat 161 11 Supplementary Chandra point-source catalog
See also: J/AJ/124/2351 : Chandra Deep Field North survey. XII (Bauer+, 2002) 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
Bytes Format Units Label Explanations
1- 3 A3 --- Seq 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) 17 A1 --- DE- Sign of Declination (J2000) 18- 19 I2 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_Fcnt Limit flag on Fcnt 34- 39 F6.1 ct Fcnt Full band counts (2) 41- 44 F4.1 ct e_Fcnt ? The 1σ statistical error in Fcnt 46- 47 A2 --- f_Fcnt [abc ] Flag on Fcnt3) 49 A1 --- l_Scnt Limit flag on Scnt 50- 55 F6.1 ct Scnt Soft band (0.5-2keV ) counts (2) 57- 60 F4.1 ct e_Scnt ? The 1σ statistical error in Scnt 62- 63 A2 --- f_Scnt [abc ] Flag on Scnt (3) 65 A1 --- l_Hcnt Limit flag on Hcnt 66- 71 F6.1 ct Hcnt Hard band (2-8keV) counts (2) 73- 76 F4.1 ct e_Hcnt ? The 1σ statistical error in Hcnt 78- 79 A2 --- f_Hcnt [abc ] Flag on Hcnt (3) 81 A1 --- l_UHcnt Limit flag on UHcnt 82- 86 F5.1 ct UHcnt Ultrahard band (4-8keV) counts (2) 88- 91 F4.1 ct e_UHcnt ? The 1σ statistical error in UHcnt 93- 94 A2 --- f_UHcnt [abc ] Flag on UHcnt (3) 96 A1 --- l_HR Limit flag on HR 97-100 F4.2 --- HR ? Hardness band ratio (4) 102-106 F5.2 --- E_HR ? Upper limit error on HR 108-111 F4.2 --- e_HR ? Lower limit error on HR 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 ExpTime Effective exposure time 128 A1 --- l_FFB Limit flag on FFB 129-134 F6.2 10-18W/m2 FFB Full band (0.5-8keV) observed-frame flux in units of 10-15 erg/cm2/s (6) 136 A1 --- l_FSB Limit flag on FSB 137-141 F5.2 10-18W/m2 FSB Soft band (0.5-2keV) observed-frame flux in units of 10-15 erg/cm2/s (6) 143 A1 --- l_FHB Limit flag on FHB 144-149 F6.2 10-18W/m2 FHB Hard band (2-8keV) observed-frame flux in units of 10-15 erg/cm2/s (6) 151 A1 --- l_FUHB Limit flag on FUHB 152-156 F5.2 10-18W/m2 FUHB Ultrahard band (4-8keV) observed-frame flux in units of 10-15 erg/cm2/s (6) 158-161 A4 --- Note Source notes (7)
Note (1): The designations are in Simbad: [BAH2001] NNN = CXOHDFN JHHMMSS.s+DDMMSS [BAH2001] SNN = CXOHDFN JHHMMSS.s+DDMMSS Note (2): Counts 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.
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
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 22-Jan-2002
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