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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 188 158 Chandra GWS X-ray catalogue
tablea1.dat 186 21 Additional sources detected in ELAIS-N1
tablea2.dat 187 75 Additional sources detected in HDF-N
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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
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Bytes Format Units Label Explanations
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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)
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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
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Dec-2005