Optical Spectra of Type Ia Supernovae at z=0.46 and z=1.2

Details Optical Spectra of Type Ia Supernovae at z=0.46 and z=1.2 Optical Spectra of Type Ia Supernovae at z=0.46 and z=1.2

2000-09-06

arxiv.org/abs/astro-ph/0009102v1

Astronomy and Astrophysics

Astrophysics

6 pages including 2 figures; to appear in The Astrophysical Journal Letters

Scientific paper

10.1086/317311

We present optical spectra, obtained with the Keck 10-m telescope, of two high-redshift type Ia supernovae (SNe Ia) discovered by the High-z Supernova Search Team: SN 1999ff at z=0.455 and SN 1999fv at z~1.2, the highest-redshift published SN Ia spectrum. Both SNe were at maximum light when the spectra were taken. We compare our high-z spectra with low-z normal and peculiar SNe Ia as well as with SNe Ic, Ib, and II. There are no significant differences between SN 1999ff and normal SNe Ia at low redshift. SN 1999fv appears to be a SN Ia and does not resemble the most peculiar nearby SNe Ia.

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