2002/09/13 by P. Boumis, Panayotis Boumis, Fotis Mavromatakis +5 · 2 citations
Physics and Astronomy · #Astro and Planetary Science #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20021365
published as Astron.Astrophys. 396 (2002) 225-234 · 13 pages, 7 figures, accepted for publication in A&A
arxiv created 2002/09/13 · openalex publication_date 2002/11/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
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.