First results of a sensitive search for H I envelopes in a complete sample of spiral galaxies: Extensive H I near the isolated Sc I NGC 628

Journal Article · Sun Jun 01 00:00:00 EDT 1980 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/158007· OSTI ID:5097080

Briggs, F H; Wolfe, A M; Krumm, N; Salpeter, E E

Preliminary results of a search with the Arecibo 1000 foot (305 m) telescope for extended H I envelopes surrounding spiral galaxies show that column densities N(H I)> or =3 x 10/sup 18/ cm/sup -2/ at 2--3 Holmberg radii (R/sub Ho/) are not common. Our sample includes all galaxies of Hubble type later than SO, with optical major-axis diameter greater than 7', and with declination 3/sup 0/--35/sup 0/, and recessional velocity greater than 200 km s/sup -1/.

• Research Organization: Department of Physics, University of California, San Diego; and Department of Physics and Astronomy, University of Pittsburgh
• OSTI ID: 5097080
• Journal Information: Astrophys. J.; (United States), Vol. 238:2
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GALAXIES
H1 REGIONS
ENERGY SPECTRA
ABSORPTION
ABUNDANCE
EMISSION
IONIZATION
MAGNESIUM IONS
QUASARS
RADIOWAVE RADIATION
CHARGED PARTICLES
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
IONS
RADIATIONS
SPECTRA
640103* - Astrophysics & Cosmology- Quasi-Stellar
Radio
& X-Ray Sources- (-1987)
640105 - Astrophysics & Cosmology- Galaxies