The Need for High Resolution for Polarization Studies of Galactic Background Radiation

1990 ◽  
pp. 62-62 ◽  
Author(s):  
G. L. Verschuur ◽  
T. A. Th. Spoelstra
Keyword(s):  
High Resolution ◽  
Background Radiation ◽  
Polarization Studies ◽  
Galactic Background

scholarly journals The Need for High Resolution for Polarization Studies of Galactic Background Radiation

1990 ◽  
Vol 140 ◽  
pp. 62-62
Author(s):  
G.L. Verschuur ◽  
T. A. Th. Spoelstra
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Background Radiation ◽  
Limited Data ◽  
Polarization Data ◽  
The North ◽  
Polarization Studies ◽  
North Polar ◽  
Galactic Background ◽  
Scale Length

Polarization data at 390 and 826 MHz were obtained with the 300-foot telescope in February 1987. A survey of selected regions of sky planned for December 1988 had to be postponed. However, our limited data at 390 MHz show that the 30′ beam detected polarization temperatures between four to six times larger than found in surveys with a 1.3 arcmin resolution. This was true in both the highly polarized region around 1=140 degrees and in the North Polar Spur where polarization structures appear to be unresolved (<0.9 pc at the distance of the spur). High resolution observations will be critical to our understanding of the interstellar magnetic field and the scale-length of depolarizing structures.

scholarly journals Polarimetry and Physics of Be Star Envelopes (Review paper)

1982 ◽  
Vol 98 ◽  
pp. 77-93 ◽  
Author(s):  
George V. Coyne ◽  
Ian S. McLean
Keyword(s):  
High Resolution ◽  
Near Infrared ◽  
Theoretical Models ◽  
Geometrical Parameters ◽  
Be Stars ◽  
Intermediate Band ◽  
Wide Range ◽  
Recent Developments ◽  
Be Star ◽  
Polarization Studies

A review of the most recent developments in polarization studies of Be stars is presented. New polarization techniques for high-resolution spectropolarimetry and for near infrared polarimetry are described and a wide range of new observations are discussed. These include broadband, intermediate-band and multichannel observations of the continuum polarization of Be stars in the wavelenght interval 0.3–2.2 microns, high resolution (0.5 Å) line profile polarimetry of a few stars and surveys of many stars for the purposes of statistical analyses. The physical significance of the observational material is discussed in the light of recent theoretical models. Emphasis is placed on the physical and geometrical parameters of Be star envelopes which polarimetry helps to determine.

High-resolution Measurements of the Galactic Radio Spectrum

1969 ◽  
Vol 1 (5) ◽  
pp. 210-211 ◽  
Author(s):  
T. L. Landecker ◽  
R. Wielebinski
Keyword(s):  
High Resolution ◽  
Radio Emission ◽  
High Latitude ◽  
Galactic Plane ◽  
Background Radiation ◽  
Radio Spectrum ◽  
Synchrotron Emission ◽  
Detailed Structure ◽  
Detailed Understanding ◽  
Galactic Radio

High-resolution surveys of the galactic radio emission show detailed structure both near the galactic plane and at high galactic latitudes. Some of this structure is describable as ‘spurs’ while the rest comprises isolated features. We describe here measurements of the spectral index of the background radiation with a resolution of 3°.5. These measurements are aimed at a detailed understanding of the high-latitude synchrotron emission.

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).

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