Water abundance and velocity structure in S140, ρ Oph A, and B335

被引：26

作者：

Ashby, MLN

Bergin, EA

Plume, R

Carpenter, JM

Melnick, GJ

Chin, G

Erickson, NR

Goldsmith, PF

Harwit, M

Howe, JE

Kleiner, SC

Koch, DG

Neufeld, DA

Patten, BM

Schieder, R

Snell, RL

Stauffer, JR

Tolls, V

Wang, Z

Winnewisser, G

Zhang, YF

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[2] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[4] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[5] Cornell Univ, Natl Astron & Ionosphere Ctr, Dept Astron, Ithaca, NY 14853 USA

[6] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[7] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[8] Univ Cologne, Inst Phys 1, D-50937 Cologne, Germany

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 539卷 / 02期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

ISM : abundances; ISM : clouds; ISM : molecules; radio lines : ISM; stars : formation;

D O I：

10.1086/312845

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Monte Carlo radiative transfer models for B335, S140, and rho Ophiuchi A that simulate the emission line arising from the 557 GHz 1(10)-->1(01) ground-state transition of ortho-(H2O)-O-16. These models reproduce the line profiles with a combination of turbulent and macroscopic motions, and are consistent with gravitational infall in rho Oph A. We cannot, however, discriminate infall from outflow for S140. Our models are consistent with ortho-H2O abundances relative to H-2 of 2 x 10(-8) and 4.5 x 10(-9) in S140 and rho Oph A, respectively, and an upper limit of 4 x 10(-6) (3 sigma) in B335, assuming the ratio ortho-H-2/para-H-2 = 0.1. We quantify the impact of dust continuum emission on the derived abundances.

引用

页码：L119 / L122

页数：4

共 30 条

[1] SUBMILLIMETER CONTINUUM OBSERVATIONS OF RHO OPHIUCHI-A - THE CANDIDATE PROTOSTAR VLA-1623 AND PRESTELLAR CLUMPS [J].