High-velocity gas in M101

Journal Article · Sun May 01 04:00:00 EDT 1988 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/114731· OSTI ID:6935017

Van Der Hulst, T; Sancisi, R

In this paper, the discovery of neutral hydrogen moving at high speed perpendicular to the disk of the nearby spiral galaxy M101 is reported. This material is found in two locations where the spiral structure itself seems particularly disturbed. The mass involved is (1-10) x 10 to the 7th solar. The velocities appear redshifted by up to about 150 km/s with respect to the local H I disk of M101, and yet they seem to connect smoothly to other features seen in that disk. The origin of these high-velocity H I structures is not clear. The observations also confirm that the H I layer of M101 extends far beyond the optical image in radius. This exended disk seems to become more symmetric in its faint outer parts, very much as hinted by previous single-dish observations. The velocity field suggests that the rotation curve of M101 has started to decline slowly in those outer regions. 20 references.

• Research Organization: Stichting Radiostraling van Zon en Melkweg, Dwingeloo (Netherlands); Groningen, Rijksuniversiteit (Netherlands)
• OSTI ID: 6935017
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 95; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONFIGURATION
COSMIC RADIO SOURCES
ELEMENTS
ERUPTIVE VARIABLE STARS
GALAXIES
H1 REGIONS
HYDROGEN
MASS
NONMETALS
ORIGIN
SPIRAL CONFIGURATION
STARS
SUPERNOVAE
VARIABLE STARS
VELOCITY