High-J v = SiS maser emission in IRC+10216:: A new case of infrared overlaps

被引：37

作者：

Exposito, J. P. Fonfria ^{[1
]}

Agundez, M. ^{[1
]}

Tercero, B. ^{[1
]}

Pardo, J. R. ^{[1
]}

Cernicharo, J. ^{[1
]}

机构：

[1] Inst Estruct Mat, Dept Astrophys & Infrarroja, E-28006 Madrid, Spain

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 646卷 / 02期

基金：

美国国家科学基金会;

关键词：

circumstellar matter; masers; stars : AGB and post-AGB; stars : carbon;

D O I：

10.1086/507104

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the first detection of maser emission in the J = 11-10, J = 14-13, and J = 15-14 transitions of the p 0 vibrational state of SiS toward the carbon-rich star IRC + 10216. These masers seem to be produced v in the very inhomogeneous region between the star and the inner dust formation zone, located at similar or equal to(5-7)R-*, with expansion velocities below 10 km s(-1). We interpret the pumping mechanism as being due to overlaps between upsilon = 1-0 rovibrational lines of SiS and mid-IR lines of C2H2, HCN, and their C-13 isotopologues. The large number of overlaps found suggest the existence of strong masers for high-J upsilon = 0 and upsilon = 1 SiS transitions, located in the submillimeter range. In addition, it could be possible to find several rotational lines of the SiS isotopologues displaying maser emission.

引用

页码：L127 / L130

页数：4

共 26 条

[1]

AGUNDEZ M, 2006, IN PRESS APJ

[2] THE DISTRIBUTION OF SILICON SULFIDE IN THE ENVELOPE OF IRC +10216 [J].

BIEGING, JH ;

NGUYENQUANGRIEU .

ASTROPHYSICAL JOURNAL, 1989, 343 (01) :L25-L28

[3]

BUJARRABAL V, 1981, ASTRON ASTROPHYS, V102, P65

[4]

CARLSTROM U, 1990, FROM MIRAS TO PLANETARY NEBULAE : WHICH PATH FOR STELLAR EVOLUTION ?, P170

[5] A λ2 mm molecular line survey of the C-star envelope IRC+10216 [J].

Cernicharo, J ;

Guélin, M ;

Kahane, C .

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 2000, 142 (02) :181-215

[6] HIGH-EXCITATION SIO MASER EMISSION IN VY CANIS MAJORIS - DETECTION OF THE NU=4 J=5-4 TRANSITION [J].

CERNICHARO, J ;

BUJARRABAL, V ;

SANTAREN, JL .

ASTROPHYSICAL JOURNAL, 1993, 407 (01) :L33-L36

[7]

CERNICHARO J, 1991, ASTRON ASTROPHYS, V249, pL27

[8]

Cernicharo J, 1985, 52 IRAM

[9]

ELITZUR M, 1992, ANNU REV ASTRON ASTR, V30, P75

[10]

GonzalezAlfonso E, 1997, ASTRON ASTROPHYS, V322, P938

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