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A Study of Low density Ionized Gas in the Galactic Plane

Published online by Cambridge University Press:  26 May 2016

D. Anish Roshi  and
K. R. Anantharamaiah
D. Anish Roshi
Affiliation:
National Centre for Radio Astrophysics, TIFR, Post Bag 3, Ganeshkind, Pune 411007, India
K. R. Anantharamaiah
Affiliation:
National Centre for Radio Astrophysics, TIFR, Post Bag 3, Ganeshkind, Pune 411007, India

Abstract

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A complete survey of radio recombination lines (RRLs) near 327 MHz from the galactic plane (l = 330° − 0°-89°, b = 0°) was carried out using a section of the Ooty Radio Telescope (ORT) with an angular resolution of 2° × 2°. A subset of regions in the same area was observed using the whole telescope which has a beam of 2° × 6'. Hydrogen RRLs were detected in most of the positions that were observed. The lv diagram and radial distribution computed from the observed spectra and their comparison with other species in the galactic plane indicate that the low density gas detected in the survey is distributed similar to the star forming regions. For an assumed temperature of 7000 K, we estimate that the densities and sizes of the regions are in the range 1 — 10 cm−3 and 20 — 200 pc respectively. Our data suggests that the low density ionized gas is in the form of outer envelopes of normal HII regions.

Type
Part 6: Spectral Studies of our Galaxy
Information
Symposium - International Astronomical Union , Volume 199: The Universe at Low Radio Frequencies , 2002 , pp. 335 - 338
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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