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

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27898

Title:	Mid-infrared images of luminous infrared galaxies in a merging sequence
Authors:	Hwang,CY;Lo,KY;Gao,Y;Gruendl,RA;Lu,NY
Contributors:	天文研究所
Date:	1999
Issue Date:	2010-06-29 19:35:43 (UTC+8)
Publisher:	中央大學
Abstract:	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.
Relation:	ASTROPHYSICAL JOURNAL
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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