A-Model for the "Filaments" in the Cygnus Loop.

Abstract

view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A-Model for the "Filaments" in the Cygnus Loop. Parker, Robert A. R. Abstract Further spectrophotometric observations have been made, of four "filaments," and in particular detail of one "filament," in the Cygnus Loop. The Balmer decrement for all of the "filaments" studied is 2.65, or radiative for case B. The temperatures obtained from the line ratios for [0 III] and [X II] indicate that there is a stratification within individual "filaments." Collisional ionization may well be important in the high-temperature portions of the "filaments" but high-temperature thermal radiation produces the ionization of the cooler parts of the "filaments." It seems that the optical continuum may be either thermal or synchrotron and that the radio continuum is probably synchrotron emission. The so-called "filaments" are probably not filaments but irregular sheets produced by the collision of the advancing shock front with the clouds of the interstellar medium, seen edge on. Publication: The Astronomical Journal Pub Date: 1967 DOI: 10.1086/110460 Bibcode: 1967AJ.....72Q.822P full text sources ADS |