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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731820.0, MPI für Astronomie / Publikationen_mpia
The Time-Domain Spectroscopic Survey: Understanding the optically variable sky with SEQUELS in SDSS-III
Authors:Ruan, J. J.; Anderson, S. F.; Green, P. J.; Morganson, E.; Eracleous, M.; Myers, A. D.; Badenes, C.; Bershady, M. A.; Brandt, W. N.; Chambers, K. C.; Davenport, J. R. A.; Dawson, K. S.; Flewelling, H.; Heckman, T. M.; Isler, J. C.; Kaiser, N.; Kneib, J.-P.; MacLeod, C. L.; Paris, I.; Ross, N. P.; Runnoe, J. C.; Schlafly, E. F.; Schmidt, S. J.; Schneider, D. P.; Schwope, A. D.; Shen, Y.; Stassun, K. G.; Szkody, P.; Waters, C. Z.; York, D. G.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:id. 137 (16 pp)
Audience:Not Specified
Abstract / Description:The Time-Domain Spectroscopic Survey (TDSS) is an SDSS-IV eBOSS subproject primarily aimed at obtaining identification spectra of ∼220,000 optically variable objects systematically selected from SDSS/Pan-STARRS1 multi-epoch imaging. We present a preview of the science enabled by TDSS, based on TDSS spectra taken over ∼320 deg2 of sky as part of the SEQUELS survey in SDSS-III, which is in part a pilot survey for eBOSS in SDSS-IV. Using the 15,746 TDSS-selected single-epoch spectra of photometrically variable objects in SEQUELS, we determine the demographics of our variability-selected sample and investigate the unique spectral characteristics inherent in samples selected by variability. We show that variability-based selection of quasars complements color-based selection by selecting additional redder quasars and mitigates redshift biases to produce a smooth quasar redshift distribution over a wide range of redshifts. The resulting quasar sample contains systematically higher fractions of blazars and broad absorption line quasars than from color-selected samples. Similarly, we show that M dwarfs in the TDSS-selected stellar sample have systematically higher chromospheric active fractions than the underlying M-dwarf population based on their Hα emission. TDSS also contains a large number of RR Lyrae and eclipsing binary stars with main-sequence colors, including a few composite-spectrum binaries. Finally, our visual inspection of TDSS spectra uncovers a significant number of peculiar spectra, and we highlight a few cases of these interesting objects. With a factor of ∼15 more spectra, the main TDSS survey in SDSS-IV will leverage the lessons learned from these early results for a variety of time-domain science applications.
Free Keywords:quasars: general; stars: variables: general; surveys
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.3847/0004-637X/825/2/137
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