Journal Article

Supernova dust for the extinction law in a young infrared galaxy at <i>z</i>∼ 1

K. Kawara, H. Hirashita, T. Nozawa, T. Kozasa, S. Oyabu, Y. Matsuoka, T. Shimizu, H. Sameshima and N. Ienaka

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 412, issue 2, pages 1070-1080
Published in print April 2011 | ISSN: 0035-8711
Published online March 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17960.x
Supernova dust for the extinction law in a young infrared galaxy at z∼ 1

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We apply the supernova (SN) extinction curves to reproduce the observed properties of SST J1604+4304 which is a young infrared (IR) galaxy at z∼ 1. The SN extinction curves used in this work were obtained from models of unmixed ejecta of Type II supernovae for the Salpeter initial mass function with a mass range from 8 to 30 M or 8 to 40 M. The effect of dust distributions on the attenuation of starlight is investigated by performing the χ2 fitting method against various dust distributions. These are the commonly used uniform dust screen, the clumpy dust screen and the internal dust geometry. We add to these geometries three scattering properties, namely, no scattering, isotropic scattering and forward-only scattering. Judging from the χ2 values, we find that the uniform screen models with any scattering property provide good approximations to the real dust geometry. Internal dust is inefficient to attenuate starlight and thus cannot be the dominant source of the extinction. We show that the SN extinction curves reproduce the data of SST J1604+4304 comparable to or better than the Calzetti extinction curve. The Milky Way extinction curve is not in satisfactory agreement with the data unless several dusty clumps are in the line of sight. This trend may be explained by the abundance of SN-origin dust in these galaxies; SN dust is the most abundant in the young IR galaxy at z∼ 1, abundant in local starbursts and less abundant in the Galaxy. If dust in SST J1604+4304 is dominated by SN dust, the dust production rate is ∼0.1 M per SN.

Keywords: supernovae: general; dust, extinction; galaxies: evolution; galaxies: ISM; galaxies: starburst; infrared: galaxies

Journal Article.  8009 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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