Issue |
A&A
Volume 396, Number 1, December II 2002
|
|
---|---|---|
Page(s) | 225 - 234 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20021365 | |
Published online | 22 November 2002 |
New optical filamentary structures in Pegasus
1
University of Crete, Physics Department, PO Box 2208, 710 03 Heraklion, Crete, Greece
2
Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse, 85740 Garching, Germany
Corresponding author: P. Boumis, ptb@astro.noa.gr
Received:
1
July
2002
Accepted:
10
September
2002
Deep Hα+[N ii] CCD images have been obtained in the
area of the Pegasus Constellation. The resulting mosaic covers an
extent of ~ and filamentary and diffuse
emission was discovered. Several long filaments (up to ~1°)
are found within the field, while diffuse emission is present mainly
in the central and northern areas. The filaments show variations in
intensity along their extent suggesting inhomogeneous interstellar
clouds. Faint soft X–ray emission was also detected in the ROSAT
All–Sky Survey. It is mainly concentrated in the central areas of our
field and overlaps the optical emission. The low ionization images of
[S ii] of selected areas mainly show faint diffuse emission, while
in the medium ionization images of [O iii] diffuse and faint
filamentary structures are present. Spectrophotometric observations
were performed on the brightest filaments and indicate emission
from photoionized or shock–heated gas. The sulfur line ratios
indicate electron densities below ~600 cm-3, while the
absolute Hα emission lies in the range of
erg s-1 cm-2 arcsec-2. The detected optical line emission could be part of a single or
multiple supernova explosions.
Key words: ISM: general / ISM: supernova remnants / ISM: individual objects: Pegasus
© ESO, 2002
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