Absorption of the Linear Polarization of the Galactic Background Radiation by the 21 Centimeter Line of Hi

1997 ◽  
Vol 488 (1) ◽  
pp. 258-262 ◽  
Author(s):  
John M. Dickey
Keyword(s):  
Linear Polarization ◽  
Background Radiation ◽  
Galactic Background

Survey of the galactic background radiation at 3.93 and 6.55 MHz

1974 ◽  
Vol 79 ◽  
pp. 777 ◽  
Author(s):  
Joseph K. Alexander ◽  
James C. Novaco
Keyword(s):  
Background Radiation ◽  
Galactic Background

scholarly journals Galactic Background Radiation in the 78 to 111 EV Band

1990 ◽  
Vol 139 ◽  
pp. 241-242
Author(s):  
W. T. Sanders ◽  
J. J. Bloch ◽  
B. C. Edwards ◽  
K. Jahoda ◽  
M. Juda ◽  
...  
Keyword(s):  
Proportional Counter ◽  
Count Rate ◽  
Background Radiation ◽  
Field Of View ◽  
Sounding Rocket ◽  
Full Width ◽  
Half Maximum ◽  
Maximum Field ◽  
Galactic Background

Galactic background radiation has been observed in the 78-111 eV Be band using 5000 Å beryllium filters in front of a thin-window proportional counter collimated to a 15° full width at half maximum field of view. Be band data have been analyzed from two sounding rocket flights (Bloch et al. 1986, Juda 1988) that viewed seventeen different directions distributed over the northern galactic hemisphere. In Figure 1 the pointing directions of the two flights are indicated on a map from McCammon et al. (1983) of the 130-188 eV B band count rate.

Spectra and Absorption of Low Frequency Galactic Background Radiation

1976 ◽  
Vol 3 (1) ◽  
pp. 80-81
Author(s):  
H. V. Cane
Keyword(s):  
Background Radiation ◽  
Low Frequency ◽  
The Galaxy ◽  
Galactic Radio ◽  
Galactic Background

Surveys of the Galaxy at five frequencies in the range 2 to 20 MHz have been made using the Llanherne low frequency array (Ellis, 1972). The data has been assembled into maps covering the area 320° < £ < 30° and -25° < b < 22° and these are presented in rectangular galactic co-ordinates. Galactic radio spectra in various directions have been obtained, combining the new data with seven earlier galactic continuum surveys. The details of all the surveys used are given in Table I. A new 4.7 MHz map has been plotted from the profiles presented by Ellis and Hamilton (1966).

scholarly journals Galactic Background Radiation at 2 cm and Thermal Electrons in the Galaxy

1974 ◽  
Vol 60 ◽  
pp. 187-189 ◽  
Author(s):  
H. Hirabayashi
Keyword(s):  
Background Radiation ◽  
Interstellar Gas ◽  
Nonthermal Radiation ◽  
The Galaxy ◽  
Galactic Background

The galactic background radiation at 4.2 and 15.5 GHz was observed with a resolution of 11′ at nine points on the galactic equator free of confusion from discrete sources. Relative amounts of thermal and nonthermal radiation were determined, and conditions in the interstellar gas are discussed.

scholarly journals Summary: The Galactic Background Radiation

1990 ◽  
Vol 139 ◽  
pp. 485-489
Author(s):  
J. L. Puget
Keyword(s):  
Background Radiation ◽  
Direct Interpretation ◽  
Absolute Measurements ◽  
Far Ultraviolet ◽  
Galactic Background

The most striking aspect of this conference with respect to galactic studies has been the confrontation between wavelengths. The study of the background radiation requires absolute measurements of low brightness over very extended regions. Such measurements are known to be extremely difficult. We now can confront data on the galactic background at all frequencies. The data from far ultraviolet to submillimeter give particularly useful constraints on both the direct interpretation of the data and on their astrophysical interpretation.

scholarly journals The Observed Characteristics of the Local Magnetic Field

1974 ◽  
Vol 60 ◽  
pp. 137-150 ◽  
Author(s):  
J. B. Whiteoak
Keyword(s):  
Magnetic Field ◽  
Large Scale ◽  
Galactic Plane ◽  
Background Radiation ◽  
Field Structure ◽  
Local Magnetic Field ◽  
Field Parallel ◽  
Scale Field ◽  
Large Scale Field ◽  
Galactic Background

The main investigations of the local magnetic field are reviewed and are found to contain some conflict in interpretation. At radio wavelengths, studies have been made using both the Faraday rotation of the polarized radiation from extragalactic sources and pulsars, and the polarization of the galactic background radiation. With the former type of observation, although more data are available for extragalactic sources, any interpretation may be complicated by the influence of distant field structure. The results are consistent with a large-scale field parallel to the galactic plane, with a field strength of about 2 µG, and which is directed towards l=90°. This field contains irregularities in direction and strength on a scale of about 100–200 pc. The polarization of galactic background radiation may yield the most detailed information about the local field structure – the results to date show loops of magnetic fields extending along the radio spurs.The interpretation in terms of small-scale irregularities embedded in a large-scale field parallel to the galactic plane differs from that proposed to explain the optical polarization of starlight, in which a helical field configuration near the Sun was preferred to a more disordered pattern.

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