PMO OpenIR  > 分子云与恒星形成研究团组
Submillimeter array (12)CO (J=3-2) interferometric observations of the central region of M51
Matsushita, S ; Sakamoto, K ; Kuo, CY ; Hsieh, PY ; Trung, DV ; Mao, RQ ; Iono, D ; Peck, AB ; Wiedner, MC ; Liu, SY ; Ohashi, N ; Lim, J
2004
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume616Issue:1Pages:L55-L58
AbstractWe present the first interferometric (12)CO (J = 3-2) observations (beam size of 3."9 x 1."6 or 160 x 65 pc) with the Submillimeter Array (SMA) toward the center of the Seyfert 2 galaxy M51. The image shows a strong concentration at the nucleus and weak emission from the spiral arm to the northwest. The integrated intensity of the central component in (12)CO (J = 3-2) is almost twice as high as that in (12)CO (J = 1-0), indicating that the molecular gas within an similar to80 pc radius of the nucleus is warm (greater than or similar to100 K) and dense (similar to10(4) cm(-3)). Similar intensity ratios are seen in shocked regions in our Galaxy, suggesting that these gas properties may be related to active galactic nucleus or starburst activity. The central component shows a linear velocity gradient (similar to1.4 km s(-1) pc(-1)) perpendicular to the radio continuum jet, similar to that seen in previous observations and interpreted as a circumnuclear molecular disk/torus around the Seyfert 2 nucleus. In addition, we identify a linear velocity gradient (0.7 km s(-1) pc(-1)) along the jet. Judging from the energetics, the velocity gradient can be explained by supernova explosions or energy and momentum transfer from the jet to the molecular gas via interaction, which is consistent with the high-intensity ratio.
KeywordDense Molecular Gas Nearby Galaxies Spiral Galaxies Active Nucleus Star-formation Co Emission Ngc-1068 Kinematics Excitation
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/7694
Collection分子云与恒星形成研究团组
Recommended Citation
GB/T 7714
Matsushita, S,Sakamoto, K,Kuo, CY,et al. Submillimeter array (12)CO (J=3-2) interferometric observations of the central region of M51[J]. ASTROPHYSICAL JOURNAL,2004,616(1):L55-L58.
APA Matsushita, S.,Sakamoto, K.,Kuo, CY.,Hsieh, PY.,Trung, DV.,...&Lim, J.(2004).Submillimeter array (12)CO (J=3-2) interferometric observations of the central region of M51.ASTROPHYSICAL JOURNAL,616(1),L55-L58.
MLA Matsushita, S,et al."Submillimeter array (12)CO (J=3-2) interferometric observations of the central region of M51".ASTROPHYSICAL JOURNAL 616.1(2004):L55-L58.
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