2018ApJ...867..139V -
Astrophys. J., 867, 139-139 (2018/November-2)
Interstellar matters: neutral hydrogen and the Galactic magnetic field.
VERSCHUUR G.L., SCHMELZ J.T. and ASGARI-TARGHI M.
Abstract (from CDS):
A very long and nearly straight H I filament at about -60 km s–1 in the southern Galactic hemisphere, seen nearly normal to the line of sight and well separated from low-velocity gas, has been studied in several ways in order to understand its physics, structure, and morphology. Gaussian analysis of 1800 profiles and examination of 140 declination-velocity cross sections shows that an underlying H I component, which is at least 15° long and about 1° wide, has a typical line width of 21 km s–1. It does not appear to be in thermal pressure equilibrium with its surroundings; rather, it may be confined by a magnetic field of 18 µG. Narrow, elongated features (threads), probably unresolved in the 4' H I observations, have been identified within the boundaries of the filament. In general, each of these threads has two emission components, with line widths of the order of 8 and 3 km s–1, which may wind around each other. Analysis suggests that these cooler components have an average density of 29 cm–3 and may be confined by a magnetic field of 5 µG. These results, taken together, can be explained if this southern filament has magnetic substructure.
Abstract Copyright:
© 2018. The American Astronomical Society. All rights reserved.
Journal keyword(s):
ISM: atoms - ISM: clouds - ISM: magnetic fields
Simbad objects:
4
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