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J/AJ/114/2269 A deep multicolor survey. III. (Kennefick+, 1997)
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A deep multicolor survey. III. Additional spectroscopy and implications for the
number counts of faint quasars.
Kennefick J.D., Osmer P.S., Hall P.B., Green R.F.
<Astron. J. 114, 2269 (1997)>
=1997AJ....114.2269K (SIMBAD/NED BibCode)
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ADC_Keywords: QSOs ; Galaxies, photometry ; Surveys
Abstract:
We have made spectroscopic identifications of 39 additional quasar
candidates from the Deep Multicolor Survey (DMS) of Hall et al. (1996,
Cat. <J/ApJ/462/614>). We have identified 9 new quasars with 0.3<z<2.8
and 16.8<B<21.6, all from the group of candidates with ultraviolet
excess (UVX). No new quasars with z>3 were found among the observed
candidates selected due to their red (B-R) and (V-R) colors. As a
result, there are now 55 confirmed quasars in the survey: 42 with
0.3<z<2, nine with 2<z<3, three with 3<z<4, and 1 at z=4.3. One new
quasar, DMS 0059-0055, is very bright with B=16.8 and z=0.3, making
its detection by our survey very unexpected. Including this new
spectroscopy, the results of the DMS are converging with the predicted
space densities of other surveys. In particular, we no longer find an
excess of quasars with z<2.3 and B<21 in the survey over predictions
based on models by Koo & Kron (1988ApJ...325...92K). Also, the excess
in the number of quasars seen at z>3 over predictions based on models
by Warren et al. (1994ApJ...421..412W) is less than previously
suggested. We also demonstrate the success of our quasar color
modeling which is important in assessing the completeness of our
survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 71 9 Quasars: Identifications
table2.dat 66 4 Compact narrow emission-lines galaxies:
Identifications
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See also:
J/ApJS/104/185 : A deep multicolor survey. I. (Hall+ 1996)
J/ApJ/462/614 : A deep multicolor survey. II. (Hall+ 1996)
J/ApJS/119/189 : A deep multicolor Survey. IV. (Osmer+ 1998)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- No Sequential number
4- 17 A14 --- Name DMS or N designation (1)
19- 20 I2 h RAh Right ascension (1950.0)
22- 23 I2 min RAm Right ascension (1950.0)
25- 29 F5.2 s RAs Right ascension (1950.0)
31 A1 --- DE- Declination sign
32- 33 I2 deg DEd Declination (1950.0)
35- 36 I2 arcmin DEm Declination (1950.0)
38- 42 F5.2 arcsec DEs Declination (1950.0)
44- 47 F4.1 mag Bmag B magnitude
49- 53 F5.3 --- z ? Redshift
54 A1 --- u_z [?] Uncertainty flag on z
56- 72 A17 --- Notes Notes
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Note (1): DMS followed by the epoch 1950.0 position in table1,
N followed by the epoch 1950.0 position in table2.
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History: Prepared via OCR at CDS.
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(End) James Marcout, Patricia Bauer [CDS] 22-Mar-1999