Open AccessExtinction curves expected in young galaxies
Author(s) -
Hirashita Hiroyuki,
Nozawa Takaya,
Kozasa Takashi,
Ishii Takako T.,
Takeuchi Tsutomu T.
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2005.08730.x
Subject(s) - physics , extinction (optical mineralogy) , astrophysics , supernova , galaxy , light curve , redshift , quasar , astronomy , cosmic dust , pair instability supernova , optics , ejecta
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 SiO 2 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.