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Extinction curves expected in young galaxies

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Title: Extinction curves expected in young galaxies
Authors: Hirashita, Hiroyuki Browse this author
Nozawa, Takaya Browse this author
Kozasa, Takashi Browse this author →KAKEN DB
Ishii, Takako T. Browse this author
Takeuchi, Tsutomu T. Browse this author
Keywords: supernovae: general
dust, extinction
galaxies: evolution
galaxies: highredshift
galaxies: ISM
quasars: individual: SDSS J104845.05+463718.3
Issue Date: Mar-2005
Publisher: Blackwell Publishing
Journal Title: Monthly Notices of the Royal Astronomical Society
Volume: 357
Issue: 3
Start Page: 1077
End Page: 1087
Publisher DOI: 10.1111/j.1365-2966.2005.08730.x
Abstract: We investigate the extinction curves of young galaxies in which dust is supplied from Type II supernovae (SNe II) and/or pair instability supernovae (PISNe). We adopt Nozawa et al. (2003) for compositions and size distribution of grains formed in SNe II and PISNe. We find that the extinction curve is quite sensitive to internal metal mixing in supernovae (SNe). The extinction curves predicted from the mixed SNe are dominated by SiO2 and are characterized by a steep rise from infrared to ultraviolet (UV). The dust from unmixed SNe shows a shallower extinction curve, because of the contribution from large-sized (∼0.1 μm) Si grains. However, the progenitor mass is important in unmixed SNe II: if the progenitor mass is smaller than ∼20 M⊙, the extinction curve is flat in UV; otherwise, the extinction curve rises towards the short wavelength. The extinction curve observed in a high-redshift quasar (z = 6.2) favours the dust production by unmixed SNe II. We also provide some useful observational quantities, so that our model might be compared with future high-z extinction curves.
Rights: The definitive version is available at
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小笹 隆司

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