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The comparison between H2CO and OH in the Milky Way
Guo, Wei Hua1,2; Esimbek, Jarken1,3; Tang, Xin Di1,3,4; Zhou, Jian Jun1,3; Baan, Willem A.5; Yuan, Ye1,3; Wu, Gang1,3; Zhang, Yan Jun1,2; Komesh, Toktarkhan6
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A catalog of 4231 Galactic H2CO absorption lines (similar to 2241 sources) at 6 cm has been collected from the literature published up to 2014. The distribution of these H2CO absorption lines has been compared with the OH masers at 18 cm in the Milky Way. Most of the OH masers are distributed in the inner Galaxy (-75 degrees < l < 75 degrees) with a higher Galactic latitude than the H2CO sources (-5 degrees < b < 5 degrees). The longitude-velocity distributions of H2CO and OH show that the majority of the objects are located in the molecular ring following the CO molecular gas distribution. The range of velocities of the OH masers is larger and distribution more diffuse than the H2CO sources in the Galactic longitude range 30 degrees < l < 90 degrees. The H2CO sources have been matched with the four ground state transitions of OH and a close associations have been found with H2CO clouds with small velocity differences (< 5 km s(-1)). The H2CO sources observed with a higher resolution telescope have a better correlation with the OH maser, which may imply a common excitation process and may be attributed to shock excitation. The correlation index of the 1720 MHz OH for the relations LOH-L-H2CO(alpha) and LOH-L-IR(alpha) is much weaker as compared with 1612, 1665, and 1667 MHz OH transitions. The correlation between H2CO and the interstellar OH maser is much stronger than between H2CO and the stellar OH maser. Similarly the correlation is stronger for the presence than for the absence of far-infrared radiation ( FIR) sources. This may indicate that both the FIR and the radio continuum connects the OH with H2CO characteristics.

Correspondent Emailguowh@xao.ac.cn
KeywordMolecular Clouds: Ism Molecule: Maser Formation
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS KeywordH-ii Regions ; 6-centimeter Formaldehyde Absorption ; Massive Star-formation ; Dark Dust Clouds ; 6 Cm H2co ; Molecular Clouds ; Interstellar Formaldehyde ; Galactic-center ; Recombination Lines ; Forming Regions
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000381114700019
Funding OrganizationNational Natural Science foundation of China(11433008 ; National Basic Research Program of China (973 program)(2012CB821802) ; Program of the Light in China's Western Region (LCRW)(RCPY201202 ; 11373062 ; XBBS-2014-24) ; 11303081)
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorGuo, Wei Hua
Affiliation1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100080, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China
4.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
5.Netherlands Inst Radio Astron, NL-7991 PD Dwingeloo, Netherlands
6.Al Farabi Kazakh Natl Univ, Dept Solid State Phys & Nonlinear Phys, Fac Phys & Technol, Alma Ata 050040, Kazakhstan
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Corresponding Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Guo, Wei Hua,Esimbek, Jarken,Tang, Xin Di,et al. The comparison between H2CO and OH in the Milky Way[J]. ASTROPHYSICS AND SPACE SCIENCE,2016,361(8):264.
APA Guo, Wei Hua.,Esimbek, Jarken.,Tang, Xin Di.,Zhou, Jian Jun.,Baan, Willem A..,...&Komesh, Toktarkhan.(2016).The comparison between H2CO and OH in the Milky Way.ASTROPHYSICS AND SPACE SCIENCE,361(8),264.
MLA Guo, Wei Hua,et al."The comparison between H2CO and OH in the Milky Way".ASTROPHYSICS AND SPACE SCIENCE 361.8(2016):264.
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