A
Anna Ho
Researcher at California Institute of Technology
Publications - 12
Citations - 165
Anna Ho is an academic researcher from California Institute of Technology. The author has contributed to research in topics: Supernova & Light curve. The author has an hindex of 3, co-authored 12 publications receiving 98 citations.
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The Zwicky Transient Facility Bright Transient Survey I: Spectroscopic Classification and the Redshift Completeness of Local Galaxy Catalogs
Christoffer Fremling,Adam A. Miller,Y. Sharma,Alison Dugas,Daniel A. Perley,Kirsty Taggart,Jesper Sollerman,Ariel Goobar,Melissa L. Graham,James D. Neill,Jakob Nordin,M. Rigault,Robert J. Walters,Igor Andreoni,Ashot Bagdasaryan,Justin Belicki,Chris Cannella,Eric C. Bellm,S. B. Cenko,Kaushik De,Richard Dekany,Sara Frederick,V. Z. Golkhou,Matthew J. Graham,George Helou,Anna Ho,Mansi M. Kasliwal,Thomas Kupfer,R. R. Laher,Ashish Mahabal,Frank J. Masci,Reed Riddle,Ben Rusholme,Steve Schulze,David L. Shupe,Roger Smith,S. van Velzen,S. van Velzen,Lin Yan,Yunxi Yao,Zhuyun Zhuang,Shrinivas R. Kulkarni +41 more
TL;DR: In this article, the authors performed an analysis of the redshift completeness of local galaxy catalogs, dubbed as the Redshift Completeness Fraction (RCF; the number of SN host galaxies with known spectroscopic redshift prior to SN discovery divided by the total number of SNe hosts).
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The Zwicky Transient Facility Bright Transient Survey I: Spectroscopic Classification and the Redshift Completeness of Local Galaxy Catalogs
U. C. Fremling,Adam A. Miller,Y. Sharma,A. Dugas,Daniel A. Perley,Kirsty Taggart,Jesper Sollerman,Ariel Goobar,Melissa L. Graham,James D. Neill,J. Nordin,M. Rigault,Robert J. Walters,Igor Andreoni,Ashot Bagdasaryan,Justin Belicki,Chris Cannella,Eric C. Bellm,S. B. Cenko,Kaushik De,Richard G. Dekany,S. Frederick,V. Zach Golkhou,Matthew J. Graham,George Helou,Anna Ho,M. M. Kasliwal,Thomas Kupfer,Russ R. Laher,Ashish Mahabal,Frank J. Masci,Reed Riddle,Ben Rusholme,Steve Schulze,David L. Shupe,Roger Smith,Lin Yan,Yunxi Yao,Zhuyun Zhuang,Shrinivas R. Kulkarni +39 more
Abstract: The Zwicky Transient Facility (ZTF) is performing a three-day cadence survey of the visible Northern sky (~3$\pi$). The transient candidates found in this survey are announced via public alerts. As a supplementary product ZTF is also conducting a large spectroscopic campaign: the ZTF Bright Transient Survey (BTS). The goal of the BTS is to spectroscopically classify all extragalactic transients brighter than 18.5 mag at peak brightness and immediately announce those classifications to the public. Extragalactic discoveries from ZTF are predominantly Supernovae (SNe). The BTS is the largest flux-limited SN survey to date. Here we present a catalog of the761 SNe that were classified during the first nine months of the survey (2018 Apr. 1 to 2018 Dec. 31). The BTS SN catalog contains redshifts based on SN template matching and spectroscopic host galaxy redshifts when available. Based on this data we perform an analysis of the redshift completeness of local galaxy catalogs, dubbed as the Redshift Completeness Fraction (RCF; the number of SN host galaxies with known spectroscopic redshift prior to SN discovery divided by the total number of SN hosts). In total, we identify the host galaxies of 512 Type Ia supernovae, 227 of which have known spectroscopic redshifts, yielding an RCF estimate of $44\% \pm1\%$. We find a steady decrease in the RCF with increasing distance in the local universe. For z<0.05, or ~200 Mpc, we find RCF=0.6, which has important ramifications when searching for multimessenger astronomical events. Prospects for dramatically increasing the RCF are limited to new multi-fiber spectroscopic instruments, or wide-field narrowband surveys. We find that existing galaxy redshift catalogs are only $50\%$ complete at $r\approx16.9$ mag. Pushing this limit several magnitudes deeper will pay huge dividends when searching for electromagnetic counterparts to gravitational wave events.
Journal ArticleDOI
SN2020bvc: a Broad-lined Type Ic Supernova with a Double-peaked Optical Light Curve and a Luminous X-ray and Radio Counterpart
Anna Ho,S. R. Kulkarni,Daniel A. Perley,S. B. Cenko,S. B. Cenko,Alessandra Corsi,Steve Schulze,R. Lunnan,Jesper Sollerman,Avishay Gal-Yam,Shreya Anand,C. Barbarino,Eric C. Bellm,Rachel Bruch,Eric Burns,Eric Burns,Kaushik De,Richard G. Dekany,Alexandre Delacroix,Dmitry A. Duev,Christoffer Fremling,David Goldstein,Z. Golkhou,Matthew J. Graham,David Hale,Mansi M. Kasliwal,Thomas Kupfer,R. R. Laher,J. Martikainen,Frank J. Masci,James D. Neill,Ben Rusholme,David L. Shupe,Maayane T. Soumagnac,Maayane T. Soumagnac,Nora L. Strotjohann,Kirsty Taggart,L. Tartaglia,Lin Yan,J. Zolkower +39 more
TL;DR: In this article, optical, radio, and X-ray observations of SN2020bvc (ASASSN20bs; ZTF20aalxlis) were presented.