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2002PASP..114...35L - Publ. Astron. Soc. Pac., 114, 35-64 (2002/January-0)
The distance to SN 1999em in NGC 1637 from the expanding photosphere method.
LEONARD D.C., FILIPPENKO A.V., GATES E.L., LI W., EASTMAN R.G., BARTH A.J., BUS S.J., CHORNOCK R., COIL A.L., FRINK S., GRADY C.A., HARRIS A.W., MALKAN M.A., MATHESON T., QUIRRENBACH A. and TREFFERS R.R.
Abstract (from CDS):
We examine potential sources of systematic error in EPM-derived distances and find the most significant to result from uncertainty in the theoretical modeling of the flux distribution emitted by the SN photosphere (i.e., the ``flux dilution factor''). We compare previously derived EPM distances to eight SNe II in galaxies (or members of the same group) for which a recently revised Cepheid distance exists from the Hubble Space Telescope Key Project and find DCepheids/DEPM=0.87±0.06 (statistical); eliminating the three SNe II distances for which a Cepheid distance exists only to a group member, and not the host galaxy itself, yields DCepheids/DEPM=0.96±0.09. Additional direct comparisons, especially to spectroscopically and photometrically normal SNe II-P, will certainly help to produce a more robust comparison.
Finally, we investigate the possible use of SNe II-P as standard candles and find that for eight photometrically confirmed SNe II-P with previously derived EPM distances and SN 1999em, the mean plateau absolute brightness is MV(plateau)=-16.4±0.6 mag, implying that distances good to ∼30% (1 σ) may be possible without the need for a complete EPM analysis. At MV(plateau)=-15.9±0.2 mag, SN 1999em is somewhat fainter than the average SN II-P. The general consistency of absolute SNe II-P brightness during the plateau suggests that the standard candle assumption may allow SNe II-P to be viable cosmological beacons at z>2.
Abstract Copyright: ∼
Journal keyword(s): Cosmology: Observations - Cosmology: Distance Scale - Galaxies: Individual: NGC Number: NGC 1637 - supernovae: individual (SN 1999em)
Nomenclature: Fig.2, Table 1: [LFG2002] A (Nos A-H).
Errata: erratum vol. 114, p. 1291 (2002)
CDS comments: BD +17 4711 is a misprint for BD +17 4708.
Simbad objects: 39
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