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Minimal HCN emission from molecular clouds in M33
Rosolowsky, Erik1; Pineda, Jaime E.2,3; Gao, Yu4
2011-08-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume415Issue:2Pages:1977-1984
AbstractSince HCN emission has been shown to be a linear tracer of ongoing star formation activity, we have searched for HCN (J = 1 -> 0) emission from known GMCs in the nearby galaxy M33. No significant HCN emission has been found along any of the lines of sight. We find two lines of sight with CO-to-HCN integrated intensity ratios up to 280, nearly a factor of 6 above what is found in comparable regions of the Milky Way. Star formation tracers suggest that the HCN-to-star formation rate ratio (L-HCN/(M) over dot(star)) is a factor of 6 lower than what is observed in the Milky Way (on average) and local extragalactic systems. Simple chemical models accounting for the subsolar N/O ratio suggest that depletion cannot account for the high CO-to-HCN ratios. Given HCN formation requires high extinction (A(V) > 4), low metallicity may yield reduced dust shielding and thus a high CO/HCN ratio. The turbulence and structure of GMCs in M33 are comparable to those found in other systems, so the differences are unlikely to result from different GMC properties. Since lower CO-to-HCN ratios are associated with the highest rates of star formation, we attribute the deficits in part to evolutionary effects within GMCs.
KeywordStars: Formation Ism: Clouds Galaxies: Individual: M33 Radio Lines: Ism
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1111/j.1365-2966.2011.18851.x
WOS KeywordSTAR-FORMING GALAXIES ; DENSE GAS ; FORMATION LAW ; SCHMIDT LAW ; CO ; GRADIENT ; TRACERS ; REGIONS ; COMPLEX ; CORES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000293756300080
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4523
Collection星系中的恒星形成研究团组
Affiliation1.Univ British Columbia Okanagan, Kelowna, BC V1V 1V7, Canada
2.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
3.Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England
4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Rosolowsky, Erik,Pineda, Jaime E.,Gao, Yu. Minimal HCN emission from molecular clouds in M33[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,415(2):1977-1984.
APA Rosolowsky, Erik,Pineda, Jaime E.,&Gao, Yu.(2011).Minimal HCN emission from molecular clouds in M33.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,415(2),1977-1984.
MLA Rosolowsky, Erik,et al."Minimal HCN emission from molecular clouds in M33".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 415.2(2011):1977-1984.
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