The H II regions of the galaxy M101

Details The H II regions of the galaxy M101 The H II regions of the galaxy M101

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104...92s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 1, July 1992, p. 92-110, 418-423. Research supported by Association of Univ

Astronomy and Astrophysics

Astronomy

61

Astronomical Photometry, Charge Coupled Devices, H Ii Regions, Luminous Intensity, Spiral Galaxies, Star Formation, Active Galactic Nuclei, Carbon Monoxide, H Alpha Line, H Beta Line, Line Of Sight, Oxygen, Sulfur

Scientific paper

The physical properties and composition of the H II region population of the spiral galaxy M101 (NGC 5457) were examined using spectrophotometrically calibrated CCD imagery of two overlapping 16-arcmin fields in the M101, in which individual H II regions were identified and mapped using an automated algorithm. The characteristics obtained for the H II region population of M101 include the H II region luminosity function and radial variations in extinction; the forbidden O III line/H-beta, O/H, and forbidden S II line/H-alpha ratios; the ionization parameter U; and the numbers of ionizing photons. Global variations of physical properties of the H II regions in M101 are compared to model expectations derived for other galaxies. The evident star formation in the M101 galaxy is discussed.

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