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The Astrophysical Journal, 723:15491557, 2010 November 10 doi:10.1088/0004-637X/723/2/1549 C 2010. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
 

Summary: The Astrophysical Journal, 723:15491557, 2010 November 10 doi:10.1088/0004-637X/723/2/1549
C 2010. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
GALEX OBSERVATIONS OF DIFFUSE ULTRAVIOLET EMISSION FROM DRACO
N. V. Sujatha1
, Jayant Murthy1
, Rahul Suresh2
, Richard Conn Henry3
, and Luciana Bianchi3
1 Indian Institute of Astrophysics, Koramangala, Bangalore 560 034, India; sujatha@iiap.res.in, murthy@iiap.res.in
2 National Institute of Technology Karnataka, Surathkal, Mangalore 575 025, India; rsbullz@gmail.com
3 Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA; rch@pha.jhu.edu, bianchi@pha.jhu.edu
Received 2010 February 9; accepted 2010 September 6; published 2010 October 25
ABSTRACT
We have studied small-scale (2 ) spatial variation of the diffuse ultraviolet (UV) radiation using a set of 11
Galaxy Evolution Explorer deep observations in the constellation of Draco. We find a good correlation between
the observed UV background and the infrared (IR) 100 m flux, indicating that the dominant contributor of the
diffuse background in the field is scattered starlight from the interstellar dust grains. We also find strong evidence
of additional emission in the far-ultraviolet (FUV) band which is absent in the near-ultraviolet (NUV) band. This
is most likely due to Lyman band emission from molecular hydrogen in a ridge of dust running through the field
and to line emissions from species such as C iv (1550 ) and Si ii (1533 ) in the rest of the field. A strong

  

Source: Henry, Richard C.- Department of Physics and Astronomy, Johns Hopkins University

 

Collections: Physics