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High resolution observations of the 6 cm H_2CO maser in NGC 6240
Wang Junzhi1; Zhang Zhiyu2; Gao Yu2
2013
Source PublicationResearch in Astronomy and Astrophysics
ISSN1674-4527
Volume13Issue:3Pages:270
AbstractWe present high resolution (~ 1") H_2CO maser and 5 GHz radio continuum observations toward nearbymerging galaxyNGC 6240made with the Very Large Array in an A configuration. Two concentrations of H_2CO emission at about a 6σ level have been detected, one of which is associated with the strongest CO peak in the overlap region while the other is about 2" southwest of the southern galaxy. Both H_2CO concentrations are associated with near infrared H_2 emission, which is thought to be from shocked molecular gas. The total H_2CO line luminosity in NGC 6240 is about 60% of that in Arp 220. Based on the distribution of H_2CO emission in NGC 6240, which has both active galactic nuclei and an extreme starburst, the H_2CO megamaser is likely to be related to the effect of the starburst instead of nuclear activity. Radio continuumcannot be the inversionmechanism of H_2CO megamasers, because the two H_2CO concentrations in NGC 6240 are not associated with radio continuumemission. Instead, with the association of near infrared H_2 emission, shock dynamics may produce the inverted population of H_2CO needed to generate megamasers.
Language英语
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/28525
Collection中国科学院紫金山天文台
Affiliation1.南京大学
2.中国科学院紫金山天文台
Recommended Citation
GB/T 7714
Wang Junzhi,Zhang Zhiyu,Gao Yu. High resolution observations of the 6 cm H_2CO maser in NGC 6240[J]. Research in Astronomy and Astrophysics,2013,13(3):270.
APA Wang Junzhi,Zhang Zhiyu,&Gao Yu.(2013).High resolution observations of the 6 cm H_2CO maser in NGC 6240.Research in Astronomy and Astrophysics,13(3),270.
MLA Wang Junzhi,et al."High resolution observations of the 6 cm H_2CO maser in NGC 6240".Research in Astronomy and Astrophysics 13.3(2013):270.
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