Radio Continuum and HI Emission in Holmberg II: Tracing the Energy Balance in the ISM

Details Radio Continuum and HI Emission in Holmberg II: Tracing the Energy Balance in the ISM Radio Continuum and HI Emission in Holmberg II: Tracing the Energy Balance in the ISM

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.2462t&link_type=abstract

Astronomical Journal v.109, p.2462

Astronomy and Astrophysics

Astronomy

22

Ism: Kinematics And Dynamics, Ism: Structure, Ism: General

Scientific paper

This study examines the balance between the supernova energy injection rate and the observed HI structures in Holmberg II (HoII=UGC 4305=DDO 50). Using VLA radio continuum observations at λ90, λ20, and λ6 cm we have separated the thermal, SNR, and nonthermal disk emission of HoII. For each component, the supernova rate for HoII is derived, and compared to the energy of H I bubble formation found by Puche et al. [AJ, 103,1841(1992)]. We find a sufficient supernova rate to account for the size and number of holes seen in the H I disk of HoII, without considering the contribution of stellar winds. Comparison between the radio continuum and Hα maps suggest that supernova remnants are embedded in the H II regions of HoII.

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