Fabry-Perot H-alpha observations of Galactic H II regions

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115356· OSTI ID:6904588

Fich, M; Dahl, G P; Treffers, R R ^[1]

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1. Waterloo Univ. (Canada) California Univ., Berkeley (USA)

The radial velocity and linewidth of H-alpha emission from 284 objects listed in Galactic H II region catalogs were observed using a Fabry-Perot spectrometer. A few of these objects are supernova remnants or planetary nebula. The rest of this sample encompasses most of the H II regions that are visible optically from the Northern Hemisphere. These observations are compared to previous H-alpha observations as well as to radio recombination line and CO observations. The average radial-velocity difference V(CO) - V(H-alpha) is 0.50 + or - 0.48 km/s and the (1-sigma) dispersion is 6.44 km/s. The implications of these values are discussed in terms of a very simple kinematic and extinction H II region model. Total H-alpha luminosities for the sample are estimated, and the Galactic H II region luminosity function is compared to that recently found for other galaxies. 18 refs.

• OSTI ID: 6904588
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 99; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANGULAR VELOCITY
BALMER LINES
CATALOGS
COSMIC RADIO SOURCES
DOCUMENT TYPES
GALAXIES
H2 REGIONS
LUMINOSITY
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MILKY WAY
OPTICAL PROPERTIES
PARTICLE KINEMATICS
PHYSICAL PROPERTIES
SPECTROMETERS
SUPERNOVA REMNANTS
VELOCITY