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J/MNRAS/356/568     Deep Chandra survey of the Groth Strip   (Nandra+, 2005)
A deep Chandra survey of the Groth Strip - I. The X-ray data.
    Nandra K., Laird E.S., Adelberger K., Gardner J.P., Mushotzky R.F.,
    Rhodes J., Steidel C.C., Teplitz H.I., Arnaud K.A.
   <Mon. Not. R. Astron. Soc., 356, 568-586 (2005)>
   =2005MNRAS.356..568N
ADC_Keywords: Surveys ; X-ray sources

Keywords: surveys - galaxies: active - cosmology: observations -
          X-rays: diffuse background - X-rays: galaxies

Abstract:
    We present the results of a 200-ks Chandra observation of part of the
    Groth Strip region, using the ACIS-I instrument. We present a
    relatively simple method for the detection of point sources and
    calculation of limiting sensitivities, which we argue is at least as
    sensitive and more self-consistent than previous methods presented in
    the literature. A total of 158 distinct X-ray sources are included in
    our point-source catalogue in the ACIS-I area. The number counts show
    a relative dearth of X-ray sources in this region.

Description:
    Chandra observed the GWS on three separate occasions between 2002
    August 11 and 22, using ACIS-I as the prime instrument. The S2 and S3
    chips of the ACIS-S array were also operating during the observation,
    but as these are far off-axis we do not consider the data further. The
    sequence number identifying the observations was 900144 and the three
    observation ID numbers (3305 on 2002-08-11, 4357 on 2002-08-12, and
    4365 on 2002-08-21).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat       188      158   Chandra GWS X-ray catalogue
tablea1.dat      188       21   Additional sources detected in ELAIS-N1
tablea2.dat      188       75   Additional sources detected in HDF-N


See also:
         B/chandra : The Chandra Archive Log (CXC, 2002-)
  J/MNRAS/351/1290 : ELAIS: final band-merged catalogue (Rowan-Robinson+, 2004)
  J/ApJ/554/742    : Chandra Deep Survey of the HDF-N (Hornschemeier+, 2001)


Byte-by-byte Description of file: table*.dat

   Bytes Format Units      Label      Explanations

   1-  4  A4    ---        Seq        Sequential number (1)
   6- 21  A16   ---        CXO        CXO GWS designation (JHHMMSS.s+DDMMSS) (2)
      23  A1    ---        l_FB       Limit flag on FB
  24- 30  F7.2  ct         FB         Full-band (0.5-7keV) counts
  32- 35  F4.1  ct         E_FB       ? Error on FB, upper limit
  37- 40  F4.1  ct         e_FB       ? Error on FB, lower limit
      42  A1    ---        l_SB       Limit flag on SB
  43- 49  F7.2  ct         SB         Soft-band, 0.5-2keV) counts
  51- 54  F4.1  ct         E_SB       ? Error on SB, upper limit
  56- 59  F4.1  ct         e_SB       ? Error on SB, lower limit
      61  A1    ---        l_HB       Limit flag on HB
  62- 67  F6.2  ct         HB         Hard-band (2-7keV) counts
  69- 72  F4.1  ct         E_HB       ? Error on HB, upper limit
  74- 77  F4.1  ct         e_HB       ? Error on HB, lower limit
      79  A1    ---        l_UB       Limit flag on UB
  80- 85  F6.2  ct         UB         Ultra-hard-band (4-7keV) counts
  87- 90  F4.1  ct         E_UB       ? Error on UB, upper limit
  92- 96  F5.2  ct         e_UB       ? Error on UB, lower limit
      97  A1    ---     l_F0.5-10keV  Limit flag on F0.5-10keV
  98-103  F6.2  10-18W/m2 F0.5-10keV  Flux at 0.5-10keV
 105-108  F4.2  10-18W/m2 E_F0.5-10keV  ? Error on F0.5-10keV, upper limit
 110-113  F4.2  10-18W/m2 e_F0.5-10keV  ? Error on F0.5-10keV, lower limit
     115  A1    ---      l_F0.5-2keV  Limit flag on F0.5-2keV
 116-120  F5.2  10-18W/m2  F0.5-2keV  Flux at 0.5-2keV
 122-125  F4.2  10-18W/m2 E_F0.5-2keV  ? Error on F0.5-2keV, upper limit
 127-130  F4.2  10-18W/m2 e_F0.5-2keV  ? Error on F0.5-2keV, lower limit
     132  A1    ---       l_F2-10keV  Limit flag on F2-10keV
 133-138  F6.2  10-18W/m2  F2-10keV   Flux at 2-10keV
 140-143  F4.2  10-18W/m2 E_F2-10keV  ? Error on F2-10keV, upper limit
 145-148  F4.2  10-18W/m2 e_F2-10keV  ? Error on F2-10keV, lower limit
     150  A1    ---       l_F5-10keV  Limit flag on F5-10keV
 151-155  F5.2  10-18W/m2  F5-10keV   Flux at 5-10keV
 157-160  F4.2  10-18W/m2 E_F5-10keV  ? rms uncertainty on F5-10keV, upper limit
 162-165  F4.2  10-18W/m2 e_F5-10keV  ? rms uncertainty on F5-10keV, lower limit
 167-168  A2    ---        ---        [1E]
 169-172  F4.1  [---]      log(Pmin)  Decimal log of the lowest false detection
                                       probability found for the four bands (3)
 174-178  F5.2  arcmin     OAA        Off-axis angle
 180-183  F4.1  ---        HR         ? Hardness ratio (4)
 185-188  A4    ---        Flags      [fshu] Flags (5)

Note (1): Sequential number:
     cNNN in table3 for Chandra GWS X-ray catalogue
     aNNN in tablea1 for additional sources detected in ELAIS-N1
     fNNN in tablea2 for additional sources detected in HDF-N
Note (2): CXO nomenclature:
    table3: CXO GWS JHHMMSS.s+DDMMSS for Chandra GWS X-ray catalogue
   tablea1: CXO EN1 JHHMMSS.s+DDMMSS for additional sources detected in ELAIS-N1
   tablea2: CXO HDF-N JHHMMSS.s+DDMMSS for additional sources detected in HDF-N
Note (3): A probability of 1E-8 is assigned if the Poisson probability
          is less than this value
Note (4): Hardness ratio, HR=(H-S)/(H+S), where H and S are the 2-7keV
          and 0.5-2keV counts, corrected to on-axis values
Note (5): fshu = source detected at <4x10-6 probability in this band,
          where the bands are full (f), soft (s), hard (h) and ultra-hard (u) -
          the first band quoted is the one with the lowest probability


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    15-Dec-2005