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Titolo:
A search for massive dense cores with (CO)-C-13 J=1-0 line
Autore:
Wu, Y; Wu, J; Wang, J;
Indirizzi:
Peking Univ, CAS PKU Joint Beijing Astrophys Ctr, Dept Astron, Beijing 100871, Peoples R China Peking Univ Beijing Peoples R China 100871 ijing 100871, Peoples R China
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 2, volume: 380, anno: 2001,
pagine: 665 - 672
SICI:
1432-0746(200112)380:2<665:ASFMDC>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR CLOUD CORES; YOUNG STELLAR OBJECTS; H2O MASER SOURCES; CO OBSERVATIONS; STAR-FORMATION; OUTFLOWS; CATALOG; REGIONS; GALAXY;
Keywords:
star : formation; ISM : clouds; ISM : kinematics and dynamics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Wu, Y Peking Univ, CAS PKU Joint Beijing Astrophys Ctr, Dept Astron, Beijing 100871, Peoples R China Peking Univ Beijing Peoples R China 100871 100871, Peoples R China
Citazione:
Y. Wu et al., "A search for massive dense cores with (CO)-C-13 J=1-0 line", ASTRON ASTR, 380(2), 2001, pp. 665-672

Abstract

This paper reports (CO)-C-13 J = 1-0 line observations toward 107 IRAS or H2O maser sources with the 13.7 m telescope of the Purple Mountain Observatory (PMO). Parameters of emission components are obtained and the profile characteristics are identified. For all the components, kinematic distances are derived. The bolometric luminosities of the corresponding IRAS sources are calculated for 95 sources, all of which are larger than 10(3) L-circle dot. We also mapped eight sources. Results show that there are cores in theclouds. The sizes of the cores are about 1 similar to3 pc, much greater and more extensive than those of cores in dark clouds. The hydrogen densitiesare similar to 10(2)-10(3) cm(-3). Systematic velocity shifts were found in 3 sources. Every mapped core contains one or more IRAS source. Each core has one and only one IRAS source that satisfies the criteria of ultra compact HII (UC HII) regions. For the cores, 2MASS data are available; dozens of2MASS sources with different color indices and brightness are found withinthe core.

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Documento generato il 25/11/20 alle ore 19:02:01