A molecular line survey of Orion KL in the 350 micron band

被引:125
作者
Comito, C
Schilke, P
Phillips, TG
Lis, DC
Motte, F
Mehringer, D
机构
[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[2] CALTECH, Downs Lab Phys 320 47, Pasadena, CA 91125 USA
关键词
ISM : abundances; ISM : individual (Orion); ISM : molecules; line : formation; line : identification; submillimeter;
D O I
10.1086/425996
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
With the Caltech Submillimeter Observatory, we have carried out an unbiased spectral line survey of Orion KL throughout the 350 mum band (from 795 to 903 GHz). This is the first systematic study of molecular radiation in this frequency range. A total of 541 features, resulting from 929 transitions from a total of 26 species, have been detected. High-excitation transitions from CH3OH, CH3CN, H2CO, HNCO, and C2H5CN indicate the presence of a very hot (similar to250 K) component at the systemic velocity characteristic of the Hot Core. Physical parameters ( column density and rotational temperature) relative to a number of species have been estimated by fitting, in the LTE approximation, the whole 100 GHz spectrum at once, thus taking line blending and optical depth effects properly into account. We also report the tentative detection, for the first time outside the Galactic center region, of the radical NH2, one of the building blocks of the chemistry of ammonia.
引用
收藏
页码:127 / 167
页数:41
相关论文
共 61 条
[1]   A lambda=1.3 millimeter aperture synthesis molecular line survey of Orion Kleinmann-Low [J].
Blake, GA ;
Mundy, LG ;
Carlstrom, JE ;
Padin, S ;
Scott, SL ;
Scoville, NZ ;
Woody, DP .
ASTROPHYSICAL JOURNAL, 1996, 472 (01) :L49-&
[2]   MOLECULAR ABUNDANCES IN OMC-1 - THE CHEMICAL-COMPOSITION OF INTERSTELLAR MOLECULAR CLOUDS AND THE INFLUENCE OF MASSIVE STAR FORMATION [J].
BLAKE, GA ;
SUTTON, EC ;
MASSON, CR ;
PHILLIPS, TG .
ASTROPHYSICAL JOURNAL, 1987, 315 (02) :621-645
[3]   THE ROTATIONAL EMISSION-LINE SPECTRUM OF ORION-A BETWEEN 247-GHZ AND 263-GHZ [J].
BLAKE, GA ;
SUTTON, EC ;
MASSON, CR ;
PHILLIPS, TG .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1986, 60 (01) :357-374
[4]   High accuracy measurements on the ground state rotational spectrum of formaldehyde (H2CO) up to 2 THz [J].
Brünken, S ;
Müller, HSP ;
Lewen, F ;
Winnewisser, G .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2003, 5 (08) :1515-1518
[5]   INFRARED PUMPING AND ROTATIONAL-EXCITATION OF MOLECULES IN INTER-STELLAR CLOUDS [J].
CARROLL, TJ ;
GOLDSMITH, PF .
ASTROPHYSICAL JOURNAL, 1981, 245 (03) :891-897
[6]   THE EXCITATION, ABUNDANCE, AND DISTRIBUTION OF HNCO IN SAGITTARIUS-B2 [J].
CHURCHWELL, E ;
WOOD, D ;
MYERS, PC ;
MYERS, RV .
ASTROPHYSICAL JOURNAL, 1986, 305 (01) :405-416
[7]   Reconstructing reality: Strategies for sideband deconvolution [J].
Comito, C ;
Schilke, P .
ASTRONOMY & ASTROPHYSICS, 2002, 395 (01) :357-371
[8]  
Cornwell T, 1999, ASTR SOC P, V180, P151
[9]   On the heating source of the Orion KL hot core [J].
de Vicente, P ;
Martín-Pintado, J ;
Neri, R ;
Rodríguez-Franco, A .
ASTROPHYSICAL JOURNAL, 2002, 574 (02) :L163-L166
[10]  
DESFORETS GP, 1993, MON NOT R ASTRON SOC, V262, P915