A SEARCH FOR l-C3H+ AND l-C3H IN Sgr B2(N), Sgr B2(OH), AND THE DARK CLOUD TMC-1

被引：30
|
作者：
McGuire, Brett A. [1 ]
Carroll, P. Brandon [1 ]
Loomis, Ryan A. [2 ]
Blake, Geoffrey A. [1 ,3 ]
Hollis, Jan M. [4 ]
Lovas, Frank J. [5 ]
Jewell, Philip R. [6 ]
Remijan, Anthony J. [6 ]
机构：
[1] CALTECH, Div Chem & Chem Engn, Pasadena, CA 91125 USA
[2] Univ Virginia, Dept Chem, Charlottesville, VA 22904 USA
[3] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
[4] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[5] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA
[6] Natl Radio Astron Observ, Charlottesville, VA 22903 USA
来源：
ASTROPHYSICAL JOURNAL | 2013年 / 774卷 / 01期
关键词：
astrochemistry; ISM: clouds; ISM: individual objects (Sagittarius B2(N); Sagittarius B2(OH); TMC-1); ISM: molecules; LABORATORY MICROWAVE-SPECTRUM; LINE SURVEY; ASTRONOMICAL IDENTIFICATION; VIBRATIONAL FREQUENCIES; SPECTROSCOPIC CONSTANTS; PRIMOS SURVEY; IRC &10216; INTERSTELLAR; ION; GHZ;
D O I：
10.1088/0004-637X/774/1/56
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Pety et al. recently reported the detection of several transitions of an unknown carrier in the Horsehead PDR and attribute them to l-C3H+. Here, we have tested the predictive power of their fit by searching for, and identifying, the previously unobserved J = 1-0 and J = 2-1 transitions of the unknown carrier (B11244) toward Sgr B2(N) in data from the publicly available PRIMOS project. Also presented here are observations of the J = 6-5 and J = 7-6 transitions toward Sgr B2(N) and Sgr B2(OH) using the Barry E. Turner Legacy Survey and results from the Kaifu et al. survey of TMC-1. We calculate an excitation temperature and column density of B11244 of similar to 10 K and similar to 10(13) cm(-2) in Sgr B2(N) and similar to 79 K with an upper limit of <= 1.5 x 10(13) cm(-2) in Sgr B2(OH) and find trace evidence for the cation's presence in TMC-1. Finally, we present spectra of the neutral species in both Sgr B2(N) and TMC-1, and comment on the robustness of the assignment of the detected signals to l-C3H+.
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页数：7
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