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标题：Ultraviolet and Infrared Correlation Studies in Orion
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作者：Lakshmi S. Bose ; N. V. Sujatha ; K. Narayanankutty 等
期刊名称：Open Astronomy
电子版ISSN：2543-6376
出版年度：2015
卷号：24
期号：3
页码：319-326
DOI：10.1515/astro-2017-0233
语种：English
出版社：Walter de Gruyter GmbH & Co. KG
摘要：AbstractWe have studied the variation of diffuse ultraviolet (UV) radiation in the northern part of the Orion constellation using a set of eight areas of the GALEX All-Sky Imaging Survey in the far and near UV. Different components of diffuse UV radiation, like dust scattered emission and H2fluorescence, were quantified and separated after removing the point sources and the foreground emission in each of the fields. Then the dependence of the individual UV components on the infrared 100μm dust emission was studied. We did not find any positive correlation between the diffuse-UV and IR-100 micron intensities, probably due to the high optical depth of the region or the entire dust column not contributing to the diffuse UV radiation. However, in the far UV we noticed the presence of an excess emission in addition to the dust scattered radiation, which is clearly absent in the near UV. This excess emission, identified as the H2fluorescence, is produced by the Trapezium stars in the surrounding molecular clouds. We also compare our results with those of previous studies in the region, based on Far Ultraviolet Spectroscopic Explorer (FUSE) observations.
关键词：KeywordsISM: individual objects (Orion Nebula)ISM: ultraviolet scatteringISM: infrared emission