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UNVEILING THE PHYSICAL PROPERTIES AND KINEMATICS OF MOLECULAR GAS IN THE ANTENNAE GALAXIES (NGC 4038/9) THROUGH HIGH-RESOLUTION CO (J=3-2) OBSERVATIONS
Ueda, Junko1,2,3; Iono, Daisuke1,3; Petitpas, Glen3; Yun, Min S.4; Ho, Paul T. P.3,5; Kawabe, Ryohei1; Mao, Rui-Qing6; Martin, Sergio7; Matsushita, Satoki5,8; Peck, Alison B.3,8; Tamura, Yoichi1,9; Wang, Junzhi10; Wang, Zhong3; Wilson, Christine D.11; Zhang, Qizhou3
2012-01-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume745Issue:1Pages:65(14pp)
AbstractWe present a similar to 1 '' (100 pc) resolution (CO)-C-12 (3-2) map of the nearby intermediate-stage interacting galaxy pair NGC 4038/9 (the Antennae galaxies) obtained with the Submillimeter Array. We find that half the CO (3-2) emission originates in the overlap region where most of the tidally induced star formation had been previously found in shorter wavelength images, with the rest being centered on each of the nuclei. The gross distribution is consistent with lower resolution single-dish images, but we show for the first time the detailed distribution of the warm and dense molecular gas across this galaxy pair at resolutions comparable to the size of a typical giant molecular complex. While we find that 58% (33/57) of the spatially resolved Giant Molecular Associations (a few x 100 pc) are located in the overlap region, only <= 30% spatially coincides with the optically detected star clusters, suggesting that the bulk of the CO (3-2) emission traces the regions with very recent or near future star formation activity. The spatial distribution of the CO (3-2)/CO (1-0) integrated brightness temperature ratios mainly ranges between 0.3 and 0.6, which suggests that on average the CO (3-2) line in the Antennae is not completely thermalized and similar to the average values of nearby spirals. A higher ratio is seen in both nuclei and the southern complexes in the overlap region. A higher radiation field associated with intense star formation can account for the nucleus of NGC 4038 and the overlap region, but the nuclear region of NGC 4039 shows relatively little star formation or active galactic nucleus activity and cannot be easily explained. We show kinematical evidence that the high line ratio in NGC 4039 is possibly caused by gas inflow into the counter-rotating central disk.
KeywordGalaxies: Individual (Ngc 4038, Ngc 4039) Galaxies: Interactions Galaxies: Ism Radio Lines: Galaxies
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/745/1/65
WOS KeywordLUMINOUS INFRARED GALAXIES ; YOUNG STAR-CLUSTERS ; X-RAY SOURCES ; CHANDRA OBSERVATIONS ; SUBMILLIMETER ARRAY ; NEARBY GALAXIES ; DISK GALAXIES ; HIGH-REDSHIFT ; CLOUDS ; NGC-4038/4039
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000300316600065
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8020
Collection分子云与恒星形成研究团组
Affiliation1.Natl Inst Nat Sci, Natl Astron Observ Japan, Nobeyama Radio Observ, Minamisa Ku, Minamimaki, Nagano 3841305, Japan
2.Univ Tokyo, Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1330033, Japan
3.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
4.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA
5.Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan
6.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
7.European So Observ, Santiago 19, Chile
8.Joint ALMA Observ, Santiago 19, Chile
9.Univ Tokyo, Inst Astron, Mitaka, Tokyo 1810015, Japan
10.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
11.McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
Recommended Citation
GB/T 7714
Ueda, Junko,Iono, Daisuke,Petitpas, Glen,et al. UNVEILING THE PHYSICAL PROPERTIES AND KINEMATICS OF MOLECULAR GAS IN THE ANTENNAE GALAXIES (NGC 4038/9) THROUGH HIGH-RESOLUTION CO (J=3-2) OBSERVATIONS[J]. ASTROPHYSICAL JOURNAL,2012,745(1):65(14pp).
APA Ueda, Junko.,Iono, Daisuke.,Petitpas, Glen.,Yun, Min S..,Ho, Paul T. P..,...&Zhang, Qizhou.(2012).UNVEILING THE PHYSICAL PROPERTIES AND KINEMATICS OF MOLECULAR GAS IN THE ANTENNAE GALAXIES (NGC 4038/9) THROUGH HIGH-RESOLUTION CO (J=3-2) OBSERVATIONS.ASTROPHYSICAL JOURNAL,745(1),65(14pp).
MLA Ueda, Junko,et al."UNVEILING THE PHYSICAL PROPERTIES AND KINEMATICS OF MOLECULAR GAS IN THE ANTENNAE GALAXIES (NGC 4038/9) THROUGH HIGH-RESOLUTION CO (J=3-2) OBSERVATIONS".ASTROPHYSICAL JOURNAL 745.1(2012):65(14pp).
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