Are "Diffuse" H II Regions Responsible For Enhanced Scattering?

Details Are "Diffuse" H II Regions Responsible For Enhanced Scattering? Are "Diffuse" H II Regions Responsible For Enhanced Scattering?

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.4611m&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #46.11; Bulletin of the American Astronomical Society, Vol. 30, p.879

Astronomy and Astrophysics

Astronomy

Scientific paper

For DM > 200 cm(-3) pc more scattering is seen from pulsars than would be expected by extrapolating from lower DMs. Lockman, Pisano & Howard (Ap.J. 472, 173, 1996) identified 130 "diffuse" H II regions in the inner galaxy. These diffuse H II regions have similar properties to those of the Rosette Nebula if it were placed near the Galactic Center. The Rosette Nebula has DM ~ 300 cm(-3) pc suggesting that diffuse H II regions could be responsible for the enhanced scattering of pulsars seen towards the galactic center. Comparisions of the observed scattering parameters of pulsars with their angular distance from the nearest diffuse H II region suggests that the known diffuse H II regions could be responsible for the enhanced scattering.

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