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Measured Metallicities at the Sites of Nearby Broad-Lined Type Ic Supernovae and Implications for the SN-GRB Connection | | M. Modjaz
; L. Kewley
; R. P. Kirshner
; K. Z. Stanek
; P. Challis
; P. M. Garnavich
; J. E. Greene
; J. L. Prieto
; | | Date: |
9 Jan 2007 | | Abstract: | We discuss the optical host-galaxy properties of a sample of 9 nearby (z < 0.13) broad-lined Type Ic supernovae (SN Ic) with no observed Gamma-Ray Bursts (GRBs). We present and analyze the spectra of host galaxies that were taken at the position of the supernovae and those of the nuclear regions. We include broad-lined SN Ic that were found during the Sloan Digital Sky Survey II which is a galaxy-impartial survey and thus not skewed towards luminous galaxies. We derive oxygen abundances on the metallicity scale of Kewley & Dopita (2002) that span 8.63 < 12+log(O/H) < 9.22, and local star formation rates that are SFR(H_alpha)> 0.1-2.9 M_sun/year. Using these spectroscopic host characteristics and the corresponding galaxy luminosities, we compare them to those of five nearby (z < 0.25) GRB-SN Ic. We find that broad-lined SN Ic without GRBs tend to inhabit luminous and more metal-rich galaxies than GRB-SN. Even when we limit our attention to hosts in the same luminosity range (-17.4 < M_B < -19.5 mag), the environments of broad-lined SN Ic are more metal-rich than GRB host galaxies. Our findings are consistent with the hypothesis that low metal abundance is the cause of very massive stars becoming SN-GRB. We emphasize the potential of SN searches devoid of host galaxy bias to find supernovae in low-luminosity galaxies to increase the sample size and to study SN in different galactic environments. | | Source: | arXiv, astro-ph/0701246 | | Services: | Forum | Review | PDF | Favorites | |
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