Mid-infrared images of luminous infrared galaxies in a merging sequence

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题名:	Mid-infrared images of luminous infrared galaxies in a merging sequence
作者:	Hwang,CY;Lo,KY;Gao,Y;Gruendl,RA;Lu,NY
贡献者:	天文研究所
日期:	1999
上传时间:	2010-06-29 19:35:43 (UTC+8)
出版者:	中央大學
摘要:	We report mid-infrared observations of several luminous infrared galaxies (LIGs) carried out with the Infrared Space Observatory. Our sample was chosen to represent different phases of a merger sequence of galaxy-galaxy interaction with special emphasis on early/intermediate stages of merging. The mid-infrared emission of these LIGs shows extended structures for the early and intermediate mergers, indicating that most of the mid-infrared luminosities are not from a central active galactic nucleus. Both the infrared hardness (indicated by the IRAS 12, 25, and 60 mu m flux density ratios) and the peak-to-total Aux density ratios of these LIGs increase as projected separation of these interacting galaxies become smaller, consistent with increasing star formation activities that are concentrated to a smaller area as the merging process advances. These observations provide among the first observational constraint of largely theoretically based scenarios.
關聯:	ASTROPHYSICAL JOURNAL
显示于类别:	[天文研究所] 期刊論文

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