J/MNRAS/472/273 OzDES DR1 (Childress+, 2017)
OzDES multifibre spectroscopy for the Dark Energy Survey:
Three year results and first data release.
Childress M.J., Lidman C., Davis T.M., Tucker B.E., Asorey J., Yuan F.,
Abbott T.M.C., Abdalla F.B., Allam S., Annis J., Banerji M.,
Benoit-Levy A., Bernard S.R., Bertin E., Brooks D., Buckley-Geer E.,
Burke D.L., Rosell A.Carnero , Carollo D., Carrasco Kind M.,
Carretero J., Castander F.J., Cunha C.E., Costa L.N.da , D'Andrea C.B.,
Doel P., Eifler T.F., Evrard A.E., Flaugher B., Foley R.J., Fosalba P.,
Frieman J., Garcia-Bellido J., Glazebrook K., Goldstein D.A., Gruen D.,
Gruendl R.A., Gschwend J., Gupta R.R., Gutierrez G., Hinton S.R.,
Hoormann J.K., James D.J., Kessler R., Kim A.G., King A.L., Kovacs E.,
Kuehn K., Kuhlmann S., Kuropatkin N., Lagattuta D.J., Lewis G.F.,
Li T.S., Lima M., Lin H., Macaulay E., Maia M.A.G., Marriner J.,
March M., Marshall J.L., Martini P., McMahon R.G., Menanteau F.,
Miquel R., Moller A., Morganson E., Mould J., Mudd D., Muthukrishna D.,
Nichol R.C., Nord B., Ogando R.L.C., Ostrovski F., Parkinson D.,
Plazas A.A., Reed S.L., Reil K., Romer A.K., Rykoff E.S., Sako M.,
Sanchez E., Scarpine V., Schindler R., Schubnell M., Scolnic I.D.,
Sevilla-Noarbe N., Seymour R., Sharp M., Smith M., Soares-Santos F.,
Sobreira , Sommer N.E., Spinka H., Suchyta E., Sullivan M.,
Swanson M.E.C., Tarle G., Uddin S.A., Walker A.R., Wester W., Zhang B.R.
(DES Collaboration)
<Mon. Not. R. Astron. Soc. 472, 273 (2017)>
=2017MNRAS.472..273C 2017MNRAS.472..273C (SIMBAD/NED BibCode)
ADC_Keywords: Redshifts ; Spectroscopy ; Galaxy catalogs
Keywords: supernovae: general - dark energy
Abstract:
We present results for the first three years of OzDES, a six-year
program to obtain redshifts for objects in the Dark Energy Survey
(DES) supernova fields using the 2dF fibre positioner and AAOmega
spectrograph on the Anglo-Australian Telescope. OzDES is a
multi-object spectroscopic survey targeting multiple types of targets
at multiple epochs over a multi-year baseline, and is one of the first
multi-object spectroscopic surveys to dynamically include transients
into the target list soon after their discovery. At the end of three
years, OzDES has spectroscopically confirmed almost 100 supernovae,
and has measured redshifts for 17,000 objects, including the redshifts
of 2,566 supernova hosts. We examine how our ability to measure
redshifts for targets of various types depends on signal-to-noise,
magnitude, and exposure time, finding that our redshift success rate
increases significantly at a signal-to-noise of 2 to 3 per 1-Angstrom
bin. We also find that the change in signal-to-noise with exposure
time closely matches the Poisson limit for stacked exposures as long
as 10 hours. We use these results to predict the redshift yield of the
full OzDES survey, as well as the potential yields of future surveys
on other facilities such as 4MOST, PFS, and MSE. This work marks the
first OzDES data release, comprising 14,693 redshifts. OzDES is on
target to obtain over 30,000 redshifts over the six-year duration of
the survey, including a yield of approximately 5,700 supernova
host-galaxy redshifts.
Description:
The table contains redshifts for 14,693 objects that land within the
10 deep fields of the Dark Energy Survey. The redshifts were obtained
by the OzDES collaboration using the AAOmega spectrograph and 2dF
fibre positioner on the Anglo-Australian Telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ozdesdr1.dat 80 14693 Positions, redshifts, redshifts quality flags
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Byte-by-byte Description of file: ozdesdr1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- OzDES OzDES object number (OzDES_NNNNNN)
14- 23 F10.6 deg RAdeg Right ascension (J2000.0)
25- 34 F10.6 deg DEdeg Declination (J2000.0)
36- 43 F8.5 --- z Redshift (1)
45 I1 --- Flag Redshift quality flag (2)
49- 88 A40 --- types Object type (3)
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Note (1): Redshifts are in the heliocentric reference frame
Note (2): The redshift quality flag can have one of three values as follows:
6 = securely classified star
4 = redshift based on multiple strong spectroscopic features,
>99% confidence.
3 = redshift based typically on a single strong spectroscopic feature
or multiple weak features, >95% confidence.
Note (3): Some objects can have multiple types
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Acknowledgements:
Chris Lidman, clidman(at)aao.gov.au
(End) Chris Lidman [AAO, Australia], Patricia Vannier [CDS] 21-Sep-2017