J/MNRAS/464/1306 LARGESS survey (Ching+, 2017)
The Large Area Radio Galaxy Evolution Spectroscopic Survey (LARGESS):
survey design, data catalogue and GAMA/WiggleZ spectroscopy.
Ching J.H.Y., Sadler E.M., Croom S.M., Johnston H.M., Pracy M.B.,
Couch W.J., Hopkins A.M., Jurek R.J., Pimbblet K.A.
<Mon. Not. R. Astron. Soc., 464, 1306-1332 (2017)>
=2017MNRAS.464.1306C 2017MNRAS.464.1306C (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; Radio sources ; Photometry, SDSS ;
Redshifts
Keywords: catalogues - surveys - galaxies: active - radio continuum: galaxies
Abstract:
We present the Large Area Radio Galaxy Evolution Spectroscopic Survey
(LARGESS), a spectroscopic catalogue of radio sources designed to
include the full range of radio AGN populations out to redshift z∼0.8.
The catalogue covers ∼800deg2 of sky, and provides optical
identifications for 19179 radio sources from the 1.4GHz Faint Images
of the Radio Sky at Twenty-cm (FIRST) survey down to an optical
magnitude limit of imod<20.5 in Sloan Digital Sky Survey (SDSS)
images. Both galaxies and point-like objects are included, and no
colour cuts are applied. In collaboration with the WiggleZ and Galaxy
And Mass Assembly (GAMA) spectroscopic survey teams, we have obtained
new spectra for over 5000 objects in the LARGESS sample. Combining
these new spectra with data from earlier surveys provides
spectroscopic data for 12329 radio sources in the survey area, of
which 10 856 have reliable redshifts. 85 per cent of the LARGESS
spectroscopic sample are radio AGN (median redshift z=0.44), and 15
per cent are nearby star-forming galaxies (median z=0.08).
Low-excitation radio galaxies (LERGs) comprise the majority (83 per
cent) of LARGESS radio AGN at z<0.8, with 12 per cent being
high-excitation radio galaxies (HERGs) and 5 per cent radio-loud QSOs.
Unlike the more homogeneous LERG and QSO sub-populations, HERGs are a
heterogeneous class of objects with relatively blue optical colours
and a wide dispersion in mid-infrared colours. This is consistent with
a picture in which most HERGs are hosted by galaxies with recent or
ongoing star formation as well as a classical accretion disc.
Description:
We have compiled the Large Area Radio Galaxy Evolution Spectroscopic
Survey (LARGESS) catalogue, a new, large data set designed to study
the evolution and environments of high- and low-excitation radio
galaxies (HERGs and LERGs) out to z∼0.8. The catalogue contains 19
179 radio sources detected by the FIRST survey that have an SDSS
optical counterpart with imod<20.5. We have obtained new
good-quality optical spectra for over 5000 LARGESS objects, and adding
these to lower redshift archival data means that 10856 LARGESS
objects currently have a reliable optical redshift.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table10.dat 181 19179 Main LARGESS data table
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See also:
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)
J/MNRAS/372/425 : 2dF-SDSS Luminous Red Galaxy Survey, 2SLAQ (Cannon+, 2006)
J/MNRAS/401/1429 : WiggleZ dark energy survey (DR1) (Drinkwater+, 2010)
J/MNRAS/452/2087 : Galaxy And Mass Assembly (GAMA): DR2 (Liske+, 2015)
Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name IAU format object name (JHHMMSS.ss+DDMMSS.s)
21- 38 I18 --- SDSS SDSS photometric ID
40- 48 F9.5 deg RAdeg SDSS right ascension (J2000)
50- 58 F9.5 deg DEdeg SDSS declination (J2000)
60- 65 F6.3 mag rmag SDSS Petrosian magnitude in r band
(extinction corrected)
67- 72 F6.3 mag e_rmag ?=65.361 rms uncertainty on Rmag
74- 79 F6.3 mag imod SDSS model magnitude in i band
(extinction corrected)
81- 85 F5.3 mag e_imod rms uncertainty on imod
87- 92 F6.3 mag gmod SDSS model magnitude in g band
(extinction corrected)
94- 98 F5.3 mag e_gmod rms uncertainty on gmod
100-101 I2 --- NFIRST [1/14] Number of FIRST (Cat. VIII/92)
components
103-109 F7.2 mJy FFIRST FIRST (Cat. VIII/92) total integrated flux
111 I1 --- NNVSS [0/5] Number of NVSS (Cat. VIII/65) components
113-120 F8.3 mJy FNVSS ?=-99 NVSS (Cat. VIII/65) total integrated flux
122-129 F8.5 --- z ?=0 Final best redshift
131-132 I2 --- q_z [0/6]?=-1 Redshift reliability flag (1)
134-142 A9 --- zsource Survey source for the best redshift
144-149 F6.2 --- OIII-SN ? [OIII] λ5007 SNR
151-157 F7.2 0.1nm EWOIII ? [OIII] λ5007 equivalent width
159-165 A7 --- VClass Best visual classification
167-173 A7 --- BClass Best spectroscopic classification
175 I1 --- HIcomp [0/1] High-completeness region flag (2)
177-178 I2 --- f_z [-1/1] Radio filler target flag for
GAMA/WiggleZ (3)
180-181 I2 --- DisGAMA [-1/1] Flag to indicate whether the listed
redshift and quality code agree with the
GAMA autoz (4)
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Note (1): Redshift reliability flag as follows:
0 = poor-quality (or missing) spectrum
1 = no redshift was possible; highly noisy spectra
2 = an uncertain redshift was assigned
3 = a reasonably confident redshift; if based on [OII] alone, then the
doublet is resolved or partially resolved
4 = a redshift that has multiple (obvious) emission lines all in agreement
5 = extremely reliable redshift from a good-quality spectrum
6 = spectra classified as Galactic stars
Note (2): High-completeness region flag as follows:
1 = in region
0 = not in region
Note (3): Radio filler target flag for GAMA/WiggleZ as follows:
1 = filler
0 = not filler
-1 = zsource is not GAMA/WiggleZ
Note (4): Flag (internal data: AATSpecAutozAllv22 estimate) as follows:
1 = disagree
0 = agree
-1 = zsource is not GAMA
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-May-2018