Статья

Early-Time Photometry and Spectroscopy of the Fast Evolving SN 2006AJ Associated with GRB 060218

Modjaz, MHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Stanek, K ZDepartment of Astronomy, Ohio State University, Columbus, OH 43210Garnavich, P MDepartment of Physics, 225 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556Berlind, PSmithsonian Institution, Fred Lawrence Whipple Observatory, 670 Mount Hopkins Road, P.O. Box 97, Amado, AZ 85645Blondin, SHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Brown, WHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Calkins, MSmithsonian Institution, Fred Lawrence Whipple Observatory, 670 Mount Hopkins Road, P.O. Box 97, Amado, AZ 85645Challis, PHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Diamond-Stanic, A MSteward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721Hao, HHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Hicken, MHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138R. KirshnerHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138Prieto, J LDepartment of Astronomy, Ohio State University, Columbus, OH 43210

2006en

ABI

Аннотация

We present early photometric and spectroscopic data on the afterglow of GRB 060218 and report the evolution of the underlying supernova 2006aj. Our data span a time-range of 4 days to 22 days after the GRB and clearly establish that SN 2006aj is a fast-evolving broad-lined Type Ic SN with an extremely short rise-time (~ 10 days) and a large optical luminosity (M_V = -18.9 mag). The SN properties are deduced well since the GRB afterglow does not contribute a significant amount to the light output. The spectra show broad lines indicative of large expansion velocities, but are better matched by those of SN 2002ap and SN 1997ef than those of the proto-typical GRB-related SN 1998bw. We refine the redshift estimate to z = 0.0335. The host-galaxy is a low-metallicity dwarf galaxy (with M_V ~ -15.8 mag), similar to host-galaxies of other GRB-associated SNe.

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