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

Chorng Yuan Hwang, K. Y. Lo, Yu Gao, Robert A. Gruendl, Nanyao Y. Lu

研究成果: 雜誌貢獻期刊論文同行評審

19 引文 斯高帕斯(Scopus)


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 μm flux density ratios) and the peak-to-total flux 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.

頁(從 - 到)L17-L20
期刊Astrophysical Journal
發行號1 PART 2
出版狀態已出版 - 20 1月 1999


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