Preliminary Results of a Hydrogen-Line Survey of M31 with the O.S.U. Radio Telescope

1965 ◽  
Vol 70 ◽  
pp. 669
Author(s):  
W. D. Brundage ◽  
J. D. Kraus
Keyword(s):  
Radio Telescope ◽  
Hydrogen Line ◽  
Preliminary Results ◽  
Line Survey

scholarly journals 21-cm hydrogen-line absorption in the spectra of discrete sources

1959 ◽  
Vol 9 ◽  
pp. 360-365
Author(s):  
C. A. Muller
Keyword(s):  
Radio Telescope ◽  
Point Sources ◽  
Hydrogen Line ◽  
Preliminary Results ◽  
Strong Point ◽  
Short Survey ◽  
Line Absorption

This paper is a short survey of the results obtained with the Dwingeloo 25-meter radio telescope (beamwidth 0°.56) and the 21-cm receiver on hydrogen-line absorption effects in the spectra of a number of strong point sources. Earlier work on this subject has been done by Hagen, Lilley, and McClain [1], and by Davies and Williams [2]. Some preliminary results of the first part of the present investigation were already published [3].

scholarly journals A Low Resolution Hydrogen-line Survey of the Magellanic System. I. Observations and Digital Reduction Procedures

1963 ◽  
Vol 16 (4) ◽  
pp. 552 ◽  
Author(s):  
JV Hindman ◽  
RX McGee ◽  
AWL Carter ◽  
ECJ Holmes ◽  
M Beard
Keyword(s):  
Radio Telescope ◽  
Radio Astronomy ◽  
Neutral Hydrogen ◽  
Recording System ◽  
Digital Recording ◽  
Astronomy Observatory ◽  
Hydrogen Line ◽  
Radio Astronomy Observatory ◽  
Line Survey ◽  
Magellanic System

A survey of neutral hydrogen in the Clouds of Magellan has been made using a digital recording system in conjunction with a multichannel receiver and a 21 ft aerial. The system has been developed for use with the 210 ft radio telescope of the Australian National Radio Astronomy Observatory at Parkes, N.S.W.

scholarly journals IPS Observations at Miyun Station, BAO

2001 ◽  
Vol 203 ◽  
pp. 580-582
Author(s):  
X.Z. Zhang ◽  
J.H. Wu
Keyword(s):  
Radio Telescope ◽  
Data Reduction ◽  
Astronomical Observatory ◽  
Paper Briefly ◽  
Preliminary Results

IPS observations have recently begun at Miyun Station, Beijing Astronomical Observatory. This paper briefly describes the radio telescope at Miyun Station, discusses the observation and the data reduction procedures and presents the preliminary results of observations on IPS source 3C48.

scholarly journals A High Resolution HI Survey of M31

1983 ◽  
Vol 100 ◽  
pp. 23-26
Author(s):  
E. Brinks
Keyword(s):  
High Resolution ◽  
Spatial Resolution ◽  
Radio Telescope ◽  
Milky Way ◽  
Milky Way Galaxy ◽  
The Galaxy ◽  
First Results ◽  
Line Survey

The first results of a new high resolution 21-cm HI line survey of M31 made with the Westerbork Synthesis Radio Telescope are presented. Five areas were mapped, covering the galaxy except for the extreme northern and southern parts, at a resolution of δα × δδ × δV = 24″ × 36″ × 3.2 km s−1. The spatial resolution corresponds to 30 × 120 pc at the distance of M31. This is of the same order as the resolution at the distance of the center or our own galaxy given by a 25-m dish. Consequently the M31 survey is comparable to surveys of the Milky Way galaxy in wealth of detail as well as in amount of data (∼ 1 Gigabyte).

scholarly journals Radio light-curve for WR 146 (HM19-3, WC6+O8.5), a colliding wind binary

1999 ◽  
Vol 193 ◽  
pp. 390-391
Author(s):  
Diah Y.A. Setia Gunawan ◽  
A. Ger de Bruyn ◽  
Karel A. van der Hucht ◽  
Peredur M. Williams
Keyword(s):  
Light Curve ◽  
Flux Density ◽  
Radio Telescope ◽  
Time Scale ◽  
Preliminary Results ◽  
Average Flux

We report preliminary results of monitoring the flux from the Wolf-Rayet object WR 146 with the Westerbork Synthesis Radio Telescope at 21 cm since 1989. We find the average flux density slowly rising in the period 1989–1997, with evidence of shorter time-scale variability.

scholarly journals IPS Observations at Miyun Station, BAO

2001 ◽  
Vol 182 ◽  
pp. 189-192 ◽  
Author(s):  
J. Wu ◽  
X. Zhang ◽  
Y. Zheng
Keyword(s):  
Radio Telescope ◽  
Data Reduction ◽  
Astronomical Observatory ◽  
Paper Briefly ◽  
Preliminary Results

AbstractIPS observations have recently begun at Miyun Station, Beijing Astronomical Observatory. This paper briefly describes the radio telescope at Miyun Station, discusses the observation and the data reduction procedures, and presents the preliminary results of observations on IPS source 3C48.

scholarly journals H I Emission and Absorption in the Southern Galactic Plane Survey

2001 ◽  
Vol 18 (1) ◽  
pp. 84-90 ◽  
Author(s):  
N. M. McClure-Griffiths ◽  
John M. Dickey ◽  
B. M. Gaensler ◽  
A. J. Green ◽  
R. F. Haynes ◽  
...  
Keyword(s):  
Power Spectrum ◽  
Radio Telescope ◽  
Large Scale ◽  
Galactic Plane ◽  
Pilot Project ◽  
Small Scale ◽  
Preliminary Results ◽  
Test Region ◽  
Scale Structures ◽  
Spatial Power Spectrum

AbstractWe present preliminary results from the Southern Galactic Plane Survey (SGPS) Test Region and Parkes data. As part of the pilot project for the Southern Galactic Plane Survey, observations of a Test Region (325·5° ≤l ≤ 333·5°; −0·5° ≤ b ≤ 3·5°) were completed in December 1998. Single-dish observations of the full survey region (253° ≤ l ≤ 358 ° |b| ≤ 1°) with the Parkes Radio Telescope were completed in March 2000. We present a sample of SGPS H I data, with particular attention to the smallest-and largest-scale structures seen in absorption and emission, respectively. On the large scale, we detect many prominent H I shells. On the small scale, we note extremely compact, cold clouds seen in H I self-absorption. We explore how these two classes of objects probe opposite ends of the H I spatial power spectrum.

scholarly journals Hydrogen Content of Young Stellar Clusters. I. Methods of Observation and Reduction

1973 ◽  
Vol 26 (6) ◽  
pp. 829 ◽  
Author(s):  
HM Tovmassian
Keyword(s):  
Radio Telescope ◽  
Hydrogen Content ◽  
Data Reduction ◽  
Neutral Hydrogen ◽  
Hydrogen Gas ◽  
Continuum Emission ◽  
Stellar Clusters ◽  
Hydrogen Line ◽  
Galactic Clusters

Observations of 16 open galactic clusters in their continuum emission and at the neutral hydrogen line have been made with the Parkes 64 m radio telescope in an attempt to determine the total amount of hydrogen gas associated with them. In this, the first of a series of five papers, the observing procedure and the method of data reduction are described.

An Optlcal and Radio Investigation of the Active RS CVn Star HD 127535

1985 ◽  
Vol 6 (2) ◽  
pp. 160-164 ◽  
Author(s):  
J. L. Innis ◽  
D. W. Coates ◽  
K. Thompson ◽  
G. J. Nelson ◽  
O. B. Slee ◽  
...  
Keyword(s):  
Radio Emission ◽  
Time Scales ◽  
Radio Telescope ◽  
Large Amplitude ◽  
Amplitude Wave ◽  
Preliminary Results ◽  
Photometric Measurements ◽  
5 Ghz ◽  
Large Amplitude Wave ◽  
Photometric Variation

AbstractWe present some preliminary results of an optical and radio study of the very active RS CVn binary HD 127535. Photometric measurements show the presence of a large amplitude wave which exhibits marked changes in shape and range on time scales as short as a few months. This photometric variation is almost certainly due to large cool starspots on the cooler, more luminous component. As part of a survey of southern active-chromosphere stars with the Parkes radio telescope, HD 127535 has been observed at 5, 8.4 and 22 GHz. No detection was made at 5 GHz, possibly because of confusion due to the angular proximity of the star to the galatic plane. However, it is one of the strongest sources detected in the 8.4 GHz survey, and is one of only two stars detected at 22 GHz. Photometry obtained two cycles before the 8.4 GHz observations suggest a possible correlation between the radio emission and the photometric wave, i.e. spot visibility, but more data are needed.

scholarly journals Low radio frequency spectrum of Sgr-A*

2016 ◽  
Vol 11 (S322) ◽  
pp. 54-55
Author(s):  
Subhashis Roy
Keyword(s):  
Radio Frequency ◽  
Flux Density ◽  
Frequency Spectrum ◽  
Spectral Index ◽  
Radio Telescope ◽  
Major Axis ◽  
Galactic Centre ◽  
Preliminary Results ◽  
Radio Frequency Spectrum ◽  
Sgr A

AbstractWe observed the Galactic centre (GC) region with the partially upgraded Giant Metrewave Radio Telescope (GMRT) using a wideband system in frequency ranges of 300– 500 MHz with 16 antennas. Preliminary results are presented here. Sgr-A* is clearly detected down to 450 MHz. Sgr-A West slowly disappears at lower frequencies across the band. By taking cross-cuts across the known major-axis of Sgr-A*, we measure its total flux density across the band to be 0.4 Jy consistent with what is expected from earlier results. It clearly indicates lack of absorption from Sgr-A West. Its spectral index is consistent with its higher frequency value of +0.3.

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