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Evolution of extinction curves in galaxies
- Source :
- Monthly Notices of the Royal Astronomical Society. 440:134-142
- Publication Year :
- 2014
- Publisher :
- Oxford University Press (OUP), 2014.
-
Abstract
- We investigate the evolution of extinction curves in galaxies based on our evolution model of grain size distribution. In this model, we considered various processes: dust formation by SNe II and AGB stars, dust destruction by SN shocks in the ISM, metal accretion onto the surface of grains (referred to as grain growth), shattering and coagulation. We find that the extinction curve is flat in the earliest stage of galaxy evolution. As the galaxy is enriched with dust, shattering becomes effective to produce a large abundance of small grains ($a \la 0.01\;\mu$m). Then, grain growth becomes effective at small grain radii, forming a bump at $a \sim 10^{-3}${--}$10^{-2}\;\mu$m on the grain size distribution. Consequently, the extinction curve at ultraviolet (UV) wavelengths becomes steep, and a bump at $1/\lambda \sim 4.5\;\mu{\rm m}^{-1}\;(\lambda: \mbox{wavelength})$ on the extinction curve becomes prominent. Once coagulation becomes effective, the extinction curves become flatter, but the UV extinction remains overproduced when compared with the Milky Way extinction curve. This discrepancy can be resolved by introducing a stronger contribution of coagulation. Consequently, an interplay between shattering and coagulation could be important to reproduce the Milky Way extinction curve.<br />Comment: 10 pages, 8 figures, accepted for publication in MNRAS
- Subjects :
- Physics
Milky Way
Astronomy
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Lambda
Astrophysics - Astrophysics of Galaxies
Galaxy
Accretion (astrophysics)
Wavelength
Grain growth
Stars
Space and Planetary Science
Galaxy formation and evolution
Astrophysics::Earth and Planetary Astrophysics
Astrophysics::Galaxy Astrophysics
Subjects
Details
- ISSN :
- 13652966 and 00358711
- Volume :
- 440
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi.dedup.....c6c94687cc8fe1ff549ba380a8015efe