9.5-mm Flux Density Measurements of a Sample of Sources from the 5-GHZ s4 Survey

1978 ◽  
Vol 83 ◽  
pp. 475 ◽  
Author(s):  
A. Witzel ◽  
I. I. K. Pauliny-Toth ◽  
K. I. Kellerman
Keyword(s):  
Flux Density ◽  
Density Measurements ◽  
5 Ghz

A thermoelectric device for ophthalmic heat flux density measurements: results of piloting in healthy individuals

2019 ◽  
Vol 80 (3) ◽  
pp. 45-51
Author(s):  
L. Anatychuk ◽  
N. Pasyechnikova ◽  
V. Naumenko ◽  
O. Zadorozhnyy ◽  
R. Kobylianskyi ◽  
...  
Keyword(s):  
Heat Flux ◽  
Flux Density ◽  
Heat Flux Density ◽  
Thermoelectric Device ◽  
Healthy Individuals ◽  
Density Measurements

scholarly journals The Evolution and Distance to SCORPIUS X-1

1998 ◽  
Vol 164 ◽  
pp. 339-340
Author(s):  
E. B. Fomalont ◽  
C. F. Bradshaw ◽  
B. J. Geldzahler
Keyword(s):  
Flux Density ◽  
X Ray ◽  
The Third ◽  
Trigonometric Parallax ◽  
Relative Luminosity ◽  
5 Ghz ◽  
Eddington Limit

AbstractFrom three VLBA observations at 5 GHz, spanning 13 months, we have measured the trigonometric parallax of Sco X-1 of 0.23 ± 0.28 mas; hence its distance is > 1300 pc. This supports the hypothesis that the the x-ray luminosity is near the Eddington Limit.All three VLBA observations show a radio core of flux density 0.5 mJy and size < 4 mas. However, the third VLBA observation revealed two additional radio components, separated by 12 mas (≈ 20 au) on opposite sides of the radio core. The evolution of these new components is unknown until additional observations can be made. The relative luminosity and separation of the two radio components are inconsistent with the Doppler beaming of two identical ejecta from the radio core.

scholarly journals Multi-frequency pulsar studies at high radio frequencies

1996 ◽  
Vol 160 ◽  
pp. 279-282
Author(s):  
Michael Kramer ◽  
Kiriaki M. Xilouris
Keyword(s):  
Magnetic Field ◽  
Flux Density ◽  
Stellar Surface ◽  
Active Part ◽  
Frequency Range ◽  
Density Spectrum ◽  
Density Measurements ◽  
Radio Frequencies ◽  
Dipolar Structure ◽  
The Magnetic Field

AbstractWe report flux density measurements, polarimetric and timing observations of pulsars made at the highest radio frequencies to date, covering the widest frequency range from 1.4 GHz to 86 GHz. We find that the magnetic field maintains its dipolar structure throughout the active part of the magnetosphere, a region located close to the stellar surface and confined to a small slab of a few stellar radii. The change in width and shape of pulse profiles saturates at mm-wavelengths while the depolarization accelerates, leading to almost completely depolarized emission. Two pulsars seem to exhibit a turn-up in their flux density spectrum at mm-wavelengths.

scholarly journals VLBI Survey of a Complete Sample of Active Nuclei and Quasars

1984 ◽  
Vol 110 ◽  
pp. 15-24 ◽  
Author(s):  
T. J. Pearson ◽  
A.C.S. Readhead
Keyword(s):  
Flux Density ◽  
Radio Sources ◽  
Complete Sample ◽  
Limited Sample ◽  
Extragalactic Radio Sources ◽  
5 Ghz ◽  
Number Of Classes ◽  
Compact Sources ◽  
Continuous Range

We have conducted a VLBI survey of a complete, flux-density limited sample of 65 extragalactic radio sources, selected at 5 GHz. We have made hybrid maps at 5 GHz of all of the sources accessible to the Mark-II system. The sources can be divided provisionally into a number of classes with different properties: central components of extended double sources, steep-spectrum compact sources, very compact (almost unresolved) sources, asymmetric sources (sometimes called “core-jet” sources), and “compact double” sources. It is not yet clear whether any of these classes is physically distinct from the others, or whether there is a continuous range of properties.

scholarly journals Search for Radio Recombination Lines towards the Gravitational Lens PKS1830-211

2002 ◽  
Vol 199 ◽  
pp. 116-117
Author(s):  
N.R. Mohan ◽  
K.R. Anantharamaiah ◽  
W.M. Goss
Keyword(s):  
Flux Density ◽  
Emission Measure ◽  
Gravitational Lens ◽  
Lens System ◽  
Frequency Range ◽  
Ionized Gas ◽  
Density Measurements ◽  
Radio Recombination Lines ◽  
Upper Limits ◽  
Single Epoch

A search for radio recombination lines near 20 cm at z=0.193 and z=0.886 towards the gravitational lens system PKS1830-211 has yielded upper limits of |τL| ≤ 5 × 10−5 and ≤ 5 × 10−4 at the two redshifts respectively. Based on the non-detections, we derive upper limits to the emission measure of the ionized gas in the absorbing systems. We also present continuum flux density measurements over the frequency range 0.3—45 GHz made at a single epoch.

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