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2000•The Astrophysical JournalOpen access

Optical Spectra of Type I[CLC]a[/CLC] Supernovae at [CLC][ITAL]z[/ITAL][/CLC] = 0.46 and [CLC][ITAL]z[/ITAL][/CLC] = 1.2

Alison L. Coil, T. Matheson, A. V. Filippenko, Douglas C. Leonard, J. Tonry, Adam G. Riess, Peter Challis, A. Clocchiatti, P. Garnavich, Craig J. Hogan, Saurabh W. Jha, R. Kirshner, B. Leibundgut, M. M. Phillips, B. Schmidt, R. A. Schommer, R. Chris Smith, Alicia Soderberg, J. Spyromilio, C. W. Stubbs, N. B. Suntzeff, P. A. Woudt

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Abstract

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 an SN Ia and does not resemble the most peculiar nearby SNe Ia.

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What this paper is about

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 an SN Ia and does not resemble the most peculiar nearby SNe Ia.

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Available abstract

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 an SN Ia and does not resemble the most peculiar nearby SNe Ia.

Key concepts: Supernova, Physics, Redshift, Astrophysics, Spectral line, Optical spectra, Type (biology), Astronomy

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Optical Spectra of Type I[CLC]a[/CLC] Supernovae at [CLC][ITAL]z[/ITAL][/CLC] = 0.46 and [CLC][ITAL]z[/ITAL][/CLC] = 1.2 — Research Paper | ScholarLens