Type II Supernovae as Standardized Candles | Zendy

M. Hamuy | Zendy; Philip A. Pinto | Zendy

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Type II Supernovae as Standardized Candles

Author(s) -

M. Hamuy,

Philip A. Pinto

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/339676

Subject(s) - cosmic distance ladder , supernova , physics , astrophysics , ejecta , photosphere , type (biology) , astronomy , galaxy , spectral line , geology , redshift , paleontology

We present evidence for a correlation between expansion velocities of theejecta of Type II plateau supernovae and their bolometric luminosities duringthe plateau phase. This correlation permits one to standardize the candles anddecrease the scatter in the Hubble diagram from ~1 mag to a level of 0.4 and0.3 mag in the V and I bands, respectively. When we restrict the sample to theeight objects which are well in the Hubble flow (cz > 3,000 km/s) the scatterdrops even further to only 0.2 mag (or 9% in distance), which is comparable tothe precision yielded by Type Ia supernovae and far better than the ``expandingphotosphere method'' applied to Type II supernovae. Using SN 1987A to calibratethe Hubble diagrams we get Ho=55+/-12.Comment: 9 pages, 3 figures, 1 table, accepted by ApJ

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