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J/A+A/386/97 The Parkes quarter-Jansky flat-spectrum sample (Jackson+, 2002)
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The Parkes quarter-Jansky flat-spectrum sample.
I. Sample selection and source identifications.
Jackson C.A., Wall J.V., Shaver P.A., Kellermann K.I., Hook I.M.,
Hawkins M.R.S.
<Astron. Astrophys. 386, 97 (2002)>
=2002A&A...386...97J (SIMBAD/NED BibCode)
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ADC_Keywords: QSOs ; Radio sources ; Galaxy catalogs
Keywords: catalogues - radio continuum: galaxies - BL Lac objects: general -
galaxies: general - quasars: general
Abstract:
We present a new sample of quarter-Jansky flat-spectrum radio sources
selected to search for high-redshift quasars and to study the
evolution of the flat-spectrum quasar population. The sample comprises
878 radio sources selected from the Parkes catalogues with spectral
indices {alpha}^5GHz^_2.7GHz_>=-0.4 where S_{nu}{prop.to}{nu}^{alpha}.
The sample covers all right ascensions and the declination range from
-80.0{deg} to +2.5{deg}, excluding low galactic latitudes
(|b|<10{deg}) and the Magellanic Cloud regions. We have obtained
improved radio source positions, firstly to reconfirm the majority of
the existing identifications, and secondly, using digitized sky-survey
data and deep B, Gunn-i and Gunn-z CCD-imaging, to find optical
identifications for 223 previously-unidentified sources. We present
the final catalogue of 878 flat-spectrum sources: 827 are compact
radio sources identified with galaxies, quasars and BL Lac objects, 38
have either extended radio structure or are identified with Galactic
objects (PN, HII or non-compact radio source), 4 are obscured by
Galactic stars, and 9 (1 per cent of the total sample) remain
unidentified.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 126 878 The complete catalogue of the
Parkes quarter-Jansky sample
notes.dat 80 485 Individual notes
refs.dat 116 84 References
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See also:
VIII/15 : Parkes Radio Sources Catalogue (PKSCAT90) (Wright+ 1990)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- PKS
5- 13 A9 --- PKS PKS (BHHMM-DDD) designation
15- 16 I2 h RAph PKSCAT90 right ascension (B1950)
18- 19 I2 min RApm PKSCAT90 right ascension (B1950)
21- 24 F4.1 s RAps PKSCAT90 right ascension (B1950)
26 A1 --- DEp- PKSCAT90 declination sign (B1950)
27- 28 I2 deg DEpd PKSCAT90 declination (B1950)
30- 31 I2 arcmin DEpm PKSCAT90 declination (B1950)
33- 34 I2 arcsec DEps PKSCAT90 declination (B1950)
36- 37 I2 h RAh ? New radio right ascension (B1950)
39- 40 I2 min RAm ? New radio right ascension (B1950)
42- 46 F5.2 s RAs ? New radio right ascension (B1950)
48 A1 --- DE- New radio declination sign (B1950)
49- 50 I2 deg DEd ? New radio declination (B1950)
52- 53 I2 arcmin DEm ? New radio declination (B1950)
55- 58 F4.1 arcsec DEs ? New radio declination (B1950)
60 A1 --- n_RAh Origin of the new radio position (1)
62- 63 A2 --- r_Ident Origin of identification (2)
65- 67 A3 --- Ident Identification (3)
69- 72 F4.1 s oRA ? Offset in right ascension
74- 77 F4.1 arcsec oDE ? Offset in declination
79 A1 --- l_Bmag Limit flag on Bmag
80- 83 F4.1 mag Bmag ? B or B_J_ magnitude (4)
84 A1 --- n_Bmag [:] Note on Bmag (5)
86- 89 F4.1 mag imag ? Gunn i magnitude
91- 94 F4.1 mag zmag ? Gunn z magnitude
96 A1 --- l_z Limit flag on z
97-101 F5.3 --- z ? Redshift
102 A1 --- u_z [:] : for PKSCAT90 redshift untraceable in the
literature
104-105 I2 --- r_z ? Reference for redshift, in refs.dat file
107-111 F5.2 Jy S2.7GHz PKSCAT90 Flux density at 2.7GHz
113-117 F5.2 Jy S5GHz PKSCAT90 Flux density at5GHz
119-122 F4.2 Jy Slim PKSCAT90 S_lim,2.7GHz_ density flux
124 A1 --- Exclu [X] Exclusion flag (6)
126 A1 --- Note [*] *: note in notes.dat file
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Note (1): Origin of the new radio position:
A : ATCA observation for this project
C : ATCA calibrator (ftp.atnf.csiro.au/pub/atnfdocs/guides/at.cat)
H : R Hunstead, private communication
N : NVSS catalogue (Condon et al., 1998AJ....115.1693C)
P : A Patnaik, private communication
R : J Reynolds, private communication
S : A Savage, private communication
T : N Tasker, private communication
V : VLA observation for this project
W : White (1992, Cat. <J/other/PASAu/10.140>)
Note (2): Origin of identification:
1: Reconfirmed PKSCAT90 identification based on the following:
1a: Sky survey data and the best radio position available as shown
in the table. No offsets (radio - optical) have been determined
for these sources.
1b: COSMOS sky survey and the best radio position available as shown
in the table. Identification offsets (radio - optical) have
been determined for these sources.
1c: CCD imaging and the best radio position available as shown in
the table. Identification offsets (radio - optical) have been
determined for these sources.
2: A new identification by this project using the COSMOS database
3: A new identification by this project using CCD-imaging.
Note (3): Identification:
Q: confirmed quasar by spectroscopy or UVX photometry
Q*: stellar object based on positional coincidence with accurate
(post-PKSCAT90) radio position, although no spectrum or UVX
confirmation.
Q?: PKS radio position coincident with stellar object. No
spectroscopy/UVX confirmation.
BL: spectroscopically-confirmed BL Lac object.
G: Galaxy with morphological or spectroscopic confirmation.
G?: probably a galaxy based on optical colour or morphology.
X: no identification, was previously a PKSCAT90 empty-field source.
e: the best radio invalidates the PKSCAT90 identification in that
there is no optical source at the best radio position.
Ob: radio position obscured by foreground star.
NCS: Non-compact radio source. The source is either a steep-spectrum or
extended radio source. Refer to individual notes for full details
(Appendix B).
PN: Planetary nebula.
HII: HII region.
Note (4): B or B_J_ magnitude:
For r_Ident = 1: B or B_J_ magnitude from PKSCAT90
For r_Ident = 2: B_J_ magnitude from COSMOS
For r_Ident = 3: B magnitude from our CCD-imaging
Note (5): Uncertainty flag on Bmag:
If ':', magnitude are either
(i) estimated
(ii) untraceable in the literature although given in PKSCAT90 or
(iii) too close to the DSS plate limit to be reliable.
Note (6): Exclusion flag:
If "X", then this source is excluded from our complete sample due to
one of the following conditions:
- Source is non-compact radio source (NCS) as shown in "Ident" and
the individual notes for that source.
- Source flux density at 2.7GHz is below the survey area flux
density limit (S_2.7GHz_ < S_lim,2.7GHz_)
- Source is steep-spectrum as described in detailed notes for that
source.
- Source is outside of the original Parkes survey areas (in area
'X' of Table 2). In this case S_lim,2.7GHz_ is also set to 0.0.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- PKS PKS (BHHMM+DDD) designation
11- 80 A70 --- Note Test of the note
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode BibCode
24- 49 A26 --- Aut Author's name
51-116 A66 --- Com Comments
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History:
From electronic version of the journal
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(End) Patricia Bauer [CDS] 29-Apr-2002