The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 40 Issue 1
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- Pages.67.2-67.2
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- 2015
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- 1226-2692(pISSN)
ALMA Observations of a Keplerian Disk in the Infalling Envelope of L1527
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Lee, Jeong-Eun
(Kyung Hee University)
;
- Lee, Seokho (Kyung Hee University) ;
- Evans, Neal (University of Texas at Austin) ;
- Di Francesco, James (National Research Council Canada, Herzberg Institute of Astrophysics) ;
- Choi, Minho (Korea Astronomy and Space Science Institute) ;
- Jorgensen, Jes (University of Copenhagen) ;
- Myers, Philip (Harvard Smithsonian CfA) ;
- Mardones, Diego (Universidad de Chile)
- Published : 2015.04.10
Abstract
We report Atacama Large Millimeter/submillimeter Array (ALMA) cycle I observations of L1527, a class 0 object with an infalling envelope and a rotating disk. HCO+ and HCN J=4-3 show strong redshifted absorption against the bright continuum emission associated with the optically thick disk or inner envelope. This redshifted absorption dip is an unambiguous evidence of infall. In addition, these lines and CS J=7-6 present the Keplerian rotation profile at their position-velocity diagrams, suggesting the formation of a Keplerian disk very early in star formation. We will present a model combining an infalling envelope and a Keplerian disk to fit the ALMA observations.
Keywords