RRL OBSERVATIONS USING ORT AT 328 MHz AND WSRT AT 1.4 GHz FROM ELDWIM

Journal Article · Wed Feb 15 04:00:00 EST 2012 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/143/2/45· OSTI ID:22034717

Baddi, Raju ^[1]

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1. Raman Research Institute, C.V. Raman Avenue, Bangalore 560 080 (India)

Radio recombination line (RRL or RL for short) observations from 10 Galactic positions using the Ooty Radio Telescope (ORT) at 328 MHz and the Westerbork Synthesis Radio Telescope (WSRT) at 1.4 GHz have been presented. ORT observations were made using a recently augmented New Digital Backend (NDB). NDB offered a bandwidth of 1 MHz that was used to observe H271{alpha} RL. The eight intermediate-frequency bands offered by WSRT in the incoherent addition mode were used to detect the seven H/Hen{alpha} RLs with n = 165-171 and the H208{beta} RL. RL observations common to WSRT and ORT have been put together to model the diffuse low-density ionized gas (extended low density warm ionized medium, ELDWIM). This modeling constrains the electron number density in ELDWIM to 1.0 cm{sup -3} < n{sub e} < 10.0 cm{sup -3} for a temperature range of 10{sup 3}-10{sup 4} K for these 10 positions. An effective stellar temperature of the H II region picture for three positions showing He line detection has been presented using spherical cloud modeling. The lower limits on the stellar temperatures are >33,000 K for the obtained ratios of N{sub He+}/N{sub H+} toward these directions.

• OSTI ID: 22034717
• Journal Information: Astronomical Journal (New York, N.Y. Online), Journal Name: Astronomical Journal (New York, N.Y. Online) Journal Issue: 2 Vol. 143; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ASTROPHYSICS
COMPUTERIZED SIMULATION
COSMIC ELECTRONS
COSMIC RADIO SOURCES
DETECTION
ELECTRON DENSITY
GHZ RANGE
HELIUM
MHZ RANGE
MILKY WAY
RADIO TELESCOPES
RADIOASTRONOMY
RECOMBINATION