OzDES multifibre spectroscopy for the Dark Energy Survey: Three year results and first data release
Abstract
We present results for the first three years of OzDES, a six-year programme 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 the 4m Multi-Object Spectroscopic Telescope (4MOST), the Subaru Prime Focus Spectrograph (PFS), and the Maunakea Spectroscopic Explorer (MSE). This work marks the first OzDES data release, comprising 14,693 redshifts. OzDES is on target to obtain over a yield of approximately 5,700 supernova host-galaxy redshifts.
Keywords
Cite
@article{arxiv.1708.04526,
title = {OzDES multifibre spectroscopy for the Dark Energy Survey: Three year results and first data release},
author = {M. J. Childress and C. Lidman and T. M. Davis and B. E. Tucker and J. Asorey and F. Yuan and T. M. C. Abbott and F. B. Abdalla and S. Allam and J. Annis and M. Banerji and A. Benoit-Levy and S. R. Bernard and E. Bertin and D. Brooks and E. Buckley-Geer and D. L. Burke and A. Carnero Rosell and D. Carollo and M. Carrasco Kind and J. Carretero and F. J. Castander and C. E. Cunha and L. N. da Costa and C. B. D'Andrea and P. Doel and T. F. Eifler and A. E. Evrard and B. Flaugher and R. J. Foley and P. Fosalba and J. Frieman and J. Garcia-Bellido and K. Glazebrook and D. A. Goldstein and D. Gruen and R. A. Gruendl and J. Gschwend and R. R. Gupta and G. Gutierrez and S. R. Hinton and J. K. Hoormann and D. J. James and R. Kessler and A. G. Kim and A. L. King and E. Kovacs and K. Kuehn and S. Kuhlmann and N. Kuropatkin and D. J. Lagattuta and G. F. Lewis and T. S. Li and M. Lima and H. Lin and E. Macaulay and M. A. G. Maia and J. Marriner and M. March and J. L. Marshall and P. Martini and R. G. McMahon and F. Menanteau and R. Miquel and A. Moller and E. Morganson and J. Mould and D. Mudd and D. Muthukrishna and R. C. Nichol and B. Nord and R. L. C. Ogando and F. Ostrovski and D. Parkinson and A. A. Plazas and S. L. Reed and K. Reil and A. K. Romer and E. S. Rykoff and M. Sako and E. Sanchez and V. Scarpine and R. Schindler and M. Schubnell and D. Scolnic and I. Sevilla-Noarbe and N. Seymour and R. Sharp and M. Smith and M. Soares-Santos and F. Sobreira and N. E. Sommer and H. Spinka and E. Suchyta and M. Sullivan and M. E. C. Swanson and G. Tarle and S. A. Uddin and A. R. Walker and W. Wester and B. R. Zhang},
journal= {arXiv preprint arXiv:1708.04526},
year = {2017}
}
Comments
Accepted for publication in MNRAS. Redshift data release is available at http://www.mso.anu.edu.au/ozdes/DR1