Star formation in II ZW 70

Details Star formation in II ZW 70 Star formation in II ZW 70

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226l..11o&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 226, Nov. 15, 1978, p. L11-L15. Research supported by the Research C

Astronomy and Astrophysics

Astronomy

37

Galactic Evolution, Radio Sources (Astronomy), Star Formation, Centimeter Waves, Emission Spectra, Galactic Nuclei, H Ii Regions, Metals, Neutral Gases, Nonthermal Radiation

Scientific paper

Optical and radio data on the 'isolated extragalactic H II region' II Zw 70 are discussed. Its integrated properties, including its H I content, are similar to those of normal late-type systems with comparable luminosities. Despite a metal deficiency of 0.5 in the log, this applies to its chemical composition as well. However, in its dense central regions, II Zw 70 is undergoing an intense burst of star formation, processing about 3 solar masses per yr of gas into stars. It is inferred from the metal content that such bursts cannot have persisted for more than about 100 million yr over the lifetime of the galaxy. Preliminary evidence suggests that H Zw 70 is a nonthermal radio source.

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