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J/MNRAS/253/686 Survey of faint compact objects (Colless+, 1991)
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A spectroscopic survey of faint compact objects
COLLESS M., ELLIS R.S., TAYLOR K., SHAW G.
<Mon. Not. R. Astron. Soc. 253, 686 (1991)>
=1991MNRAS.253..686C
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ADC_Keywords: Surveys; Spectroscopy; Positional data; Colors; Spectral types
Abstract:
We present results from a low-resolution (73A) spectroscopic survey of
faint compact objects conducted with the Low Dispersion Survey Spectrograph
at the Anglo-Australian Telescope. The sample is a random subset of all
compact sources with 22.5<=b_j_<=23.5 in three high-latitude fields.
Additional data on compact sources with 21<=b_j_<=22.5 have been selected
from the higher resolution (13A) survey previously published by Colless
et al. (1990), and a subset of these brighter objects has been studied
at both dispersions.
Table 1: Summary of the photographic photometry.
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Field Band AAT Seeing Isophote Survey range
plates arcsec mag/arcsec2 mag
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10hr bj J1834 1.7 26.44 20.98<bJ<23.48
rF F1835 1.8 24.61
U U2206 2.0 25.09
13hr bj J1836 1.8 26.52 20.94<bJ<23.44
rF F1837 2.3 24.82 (20.00<bJ<23.60 in zone 13.1)
U U2208 2.3 24.88
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Table 2: The survey observations
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Survey alpha delta Obsvn Detector Exposure Area
zone (1950) dates time(s) deg2
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10.2 10 43 55.4 +00 05 33 18/3/88 IPCS 15000 0.0330
10.4 10 43 51.4 -00 06 41 20/3/88 IPCS 13500 0.0330
13.1 13 40 32.0 +00 13 22 1-2/6/86 CCD 14500 0.0078
13.2 13 41 57.3 +00 06 25 18/3/88 IPCS 12000 0.0330
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Table 5: Total b_j_ surface density
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bj-rF
Field 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 Total
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a 0 0 0 0 74 89 0 296 612 210 1281
b 44 0 105 317 270 224 91 357 702 241 2351
c 0 92 188 278 49 188 98 379 572 196 2040
d 46 190 382 564 147 188 147 379 572 196 2811
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Table7: Colour distribution of unknown compact sources
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Numbers (deg-2)
b_j_-r_F_ 21<=b_j_<=22.5 22.5<=b_J_<=23.5
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<0.25 - -
0.25-0.50 71 19
0.50-0.75 82 56
0.75-1.00 94 150
1.00-1.25 82 224
1.25-1.50 118 37
1.50-1.75 - 56
1.75-2.00 - 56
2.00-2.25 35 56
2.25-2.50 - 56
2.50-2.75 - 38
2.75-3.00 - 19
>3.00 - -
No colour 71 94
Total unknown 552 804
Total compact 1333 1560
All objects 5620 10427
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3 100 117 The survey catalogue
table5 51 20 Surface densities of spectroscopically
confirmed stars (STARS) and objects not
identified as galaxies (NONGAL)
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 7 A7 --- Id Identification number
9- 10 I2 h RAh Right ascension 1950.0
12- 13 I2 min RAm Right ascension 1950.0
15- 19 F5.2 s RAs Right ascension 1950.0
25 A1 --- DE- Declination sign
26- 27 I2 deg DEd Declination 1950.0
29- 30 I2 arcmin DEm Declination 1950.0
32- 35 F4.1 arcsec DEs Declination 1950.0
41- 45 F5.2 mag bj b_j_ magnitude
49- 52 F4.2 mag bj-rF []? b_j_-r_F_ colour index
55- 59 F5.2 mag U-bj []? U-b_j_ colour index
63- 67 F5.3 --- z []? Redshift
73- 77 A5 --- SID Spectral identification (1)
80-104 A25 --- com Comments
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Note (1): star: stars of spectral type earlier than M
qso: QSO
elg: emission line galaxies with two or more identified lines
gal: galaxies showing the Ca H+K break at 4000A
em?: spectra showing one or more unidentified emission feature
???: unidentifiable spectra
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Byte-by-byte Description of file: table5
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Bytes Format Units Label Explanations
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1 A1 --- Field Field designation (1)
3- 7 F5.2 mag bj b_j_ magnitude of the objects
9- 10 I2 deg-2 S0.25 Distribution for objects with bj-rf=0.25
12- 14 I3 deg-2 S0.50 Distribution for objects with bj-rf=0.50
16- 18 I3 deg-2 S0.75 Distribution for objects with bj-rf=0.75
20- 22 I3 deg-2 S1.00 Distribution for objects with bj-rf=1.00
24- 26 I3 deg-2 S1.25 Distribution for objects with bj-rf=1.25
28- 30 I3 deg-2 S1.50 Distribution for objects with bj-rf=1.50
32- 34 I3 deg-2 S1.75 Distribution for objects with bj-rf=1.75
36- 38 I3 deg-2 S2.00 Distribution for objects with bj-rf=2.00
40- 42 I3 deg-2 S2.25 Distribution for objects with bj-rf=2.25
44- 46 I3 deg-2 S2.50 Distribution for objects with bj-rf=2.50
48- 51 I4 deg-2 Stot Total distribution
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Note (1): a: 10hr field STARS
b: 10hr field NONGAL
c: 13hr field STARS
d: 13hr field NONGAL
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References:
Colless M.M. et al., 1990, MNRAS, 244, 408
Historical note: Keypunched at CDS
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(End) James Marcout, Patricia Bauer [CDS] 26-Jan-1995