PMO OpenIR  > 分子云与恒星形成研究团组
The thermal state of molecular clouds in the Galactic center: evidence for non-photon-driven heating
Ao, Y.1,2; Henkel, C.1,3; Menten, K. M.1; Requena-Torres, M. A.1; Stanke, T.4; Mauersberger, R.5; Aalto, S.6; Muehle, S.7; Mangum, J.8
2013-02-01
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume550Pages:A135-A135
Corresponding AuthorAo, Y (reprint author), Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany. Email: ypao@mpifr-bonn.mpg.de
AbstractWe used the Atacama Pathfinder Experiment (APEX) 12 m telescope to observe the J(KAKc) = 3(03) -> 2(02), 3(22) -> 2(21), and 3(21) -> 2(20) transitions of para-H2CO at 218 GHz simultaneously to determine kinetic temperatures of the dense gas in the central molecular zone (CMZ) of our Galaxy. The map extends over approximately 40' x 8' (similar to 100 x 20 pc(2)) along the Galactic plane with a linear resolution of 1.2 pc. The strongest of the three lines, the H2CO (3(03) -> 2(02)) transition, is found to be widespread, and its emission shows a spatial distribution similar to ammonia. The relative abundance of para-H2CO is 0.5 - 1.2 x 10(-9), which is consistent with results from lower frequency H2CO absorption lines. Derived gas kinetic temperatures for individual molecular clouds range from 50K to values in excess of 100 K. While a systematic trend toward (decreasing) kinetic temperature versus (increasing) angular distance from the Galactic center (GC) is not found, the clouds with highest temperature (T-kin > 100 K) are all located near the nucleus. For the molecular gas outside the dense clouds, the average kinetic temperature is 65 +/- 10 K. The high temperatures of molecular clouds on large scales in the GC region may be driven by turbulent energy dissipation and / or cosmic-rays instead of photons. Such a non-photon-driven thermal state of the molecular gas provides an excellent template for the more distant vigorous starbursts found in ultraluminous infrared galaxies (ULIRGs).
KeywordGalaxy: Center Ism: Clouds Ism: Molecules Radio Lines: Ism
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1051/0004-6361/201220096
WOS KeywordINTER-STELLAR CLOUDS ; SPECTRAL-LINE SURVEY ; PHYSICAL CONDITIONS ; INTERSTELLAR CLOUDS ; CENTER REGION ; FORMING REGIONS ; SAGITTARIUS B2 ; MASS FUNCTION ; SIO EMISSION ; HOT AMMONIA
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000314879700135
Citation statistics
Cited Times:78[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9831
Collection分子云与恒星形成研究团组
Affiliation1.Max Planck Inst Radioastron, D-53121 Bonn, Germany
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.King Abdulaziz Univ, Dept Astron, Jeddah 21413, Saudi Arabia
4.ESO, D-85748 Garching, Germany
5.Joint ALMA Observ, Santiago, Chile
6.Chalmers, Onsala Observ, Dept Earth & Space Sci, S-43994 Onsala, Sweden
7.Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany
8.Natl Radio Astron Observ, Charlottesville, VA 22903 USA
Recommended Citation
GB/T 7714
Ao, Y.,Henkel, C.,Menten, K. M.,et al. The thermal state of molecular clouds in the Galactic center: evidence for non-photon-driven heating[J]. ASTRONOMY & ASTROPHYSICS,2013,550:A135-A135.
APA Ao, Y..,Henkel, C..,Menten, K. M..,Requena-Torres, M. A..,Stanke, T..,...&Mangum, J..(2013).The thermal state of molecular clouds in the Galactic center: evidence for non-photon-driven heating.ASTRONOMY & ASTROPHYSICS,550,A135-A135.
MLA Ao, Y.,et al."The thermal state of molecular clouds in the Galactic center: evidence for non-photon-driven heating".ASTRONOMY & ASTROPHYSICS 550(2013):A135-A135.
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