Millimeter-wave observations of extragalactic gamma-ray sources with the haystack radio telescope

1994 ◽  
Author(s):  
J. Gregory Stacy ◽  
W. Thomas Vestrand
Keyword(s):  
Millimeter Wave ◽  
Radio Telescope ◽  
Gamma Ray

scholarly journals Timing of PSR J2055+3829, an eclipsing black widow pulsar discovered with the Nançay Radio Telescope

2019 ◽  
Vol 629 ◽  
pp. A92 ◽  
Author(s):  
L. Guillemot ◽  
F. Octau ◽  
I. Cognard ◽  
G. Desvignes ◽  
P. C. C. Freire ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Globular Clusters ◽  
Gamma Ray ◽  
Radio Signal ◽  
Galactic Disk ◽  
Mass Function ◽  
Large Area ◽  
Black Widow ◽  
Low Mass ◽  
Mass Functions

We report on the timing observations of the millisecond pulsar PSR J2055+3829 originally discovered as part of the SPAN512 survey conducted with the Nançay Radio Telescope. The pulsar has a rotational period of 2.089 ms and is in a tight 3.1 h orbit around a very low mass (0.023 ≤ mc ≲ 0.053 M⊙, 90% c.l.) companion. Our 1.4 GHz observations reveal the presence of eclipses of the radio signal of the pulsar, caused by the outflow of material from the companion, for a few minutes around superior conjunction of the pulsar. The very low companion mass, the observation of radio eclipses, and the detection of time variations of the orbital period establish PSR J2055+3829 as a “black widow” (BW) pulsar. Inspection of the radio signal from the pulsar during ingress and egress phases shows that the eclipses in PSR J2055+3829 are asymmetric and variable, as is commonly observed in other similar systems. More generally, the orbital properties of the new pulsar are found to be very similar to those of other known eclipsing BW pulsars. No gamma-ray source has been detected at the location of the pulsar in recent Fermi-LAT source catalogs. We used the timing ephemeris to search ten years of Fermi Large Area Telescope (LAT) data for gamma-ray pulsations, but were unable to detect any. This non-detection could be a consequence of the large distance of the pulsar compared to those of known gamma-ray millisecond pulsars outside of globular clusters. We finally compared the mass functions of eclipsing and non-eclipsing BW pulsars and confirmed previous findings that eclipsing BWs have higher mass functions than their non-eclipsing counterparts. Larger inclinations could explain the higher mass functions of eclipsing BWs. On the other hand, the mass function distributions of Galactic disk and globular cluster BWs appear to be consistent, suggesting, despite the very different environments, the existence of common mechanisms taking place in the last stages of evolution of BWs.

Gamma-ray and millimeter-wave emissions from the 1991 June X-class solar flares

1994 ◽  
Vol 436 ◽  
pp. 941 ◽  
Author(s):  
Reuven Ramaty ◽  
Richard A. Schwartz ◽  
Shinzo Enome ◽  
Hiroshi Nakajima
Keyword(s):  
Millimeter Wave ◽  
Solar Flares ◽  
Gamma Ray

scholarly journals The High Time Resolution Universe surveys for pulsars and fast transients

2012 ◽  
Vol 8 (S291) ◽  
pp. 29-34 ◽  
Author(s):  
Michael J. Keith
Keyword(s):  
Radio Telescope ◽  
Time Resolution ◽  
Gamma Ray ◽  
Galactic Plane ◽  
High Time ◽  
Frequency Resolution ◽  
High Time Resolution ◽  
Galactic Latitude ◽  
Millisecond Pulsars ◽  
Bank System

AbstractThe High Time Resolution Universe survey for pulsars and transients is the first truly all-sky pulsar survey, taking place at the Parkes Radio Telescope in Australia and the Effelsberg Radio Telescope in Germany. Utilising multibeam receivers with custom built all-digital recorders the survey targets the fastest millisecond pulsars and radio transients on timescales of 64 μs to a few seconds. The new multibeam digital filter-bank system at has a factor of eight improvement in frequency resolution over previous Parkes multibeam surveys, allowing us to probe further into the Galactic plane for short duration signals. The survey is split into low, mid and high Galactic latitude regions. The mid-latitude portion of the southern hemisphere survey is now completed, discovering 107 previously unknown pulsars, including 26 millisecond pulsars. To date, the total number of discoveries in the combined survey is 135 and 29 MSPs These discoveries include the first magnetar to be discovered by it's radio emission, unusual low-mass binaries, gamma-ray pulsars and pulsars suitable for pulsar timing array experiments.

scholarly journals Measurements of Antenna Surface for Millimeter-Wave Space Radio Telescope

2011 ◽  
Vol 63 (3) ◽  
pp. 475-480 ◽  
Author(s):  
Kazuhisa Kamegai ◽  
Masato Tsuboi ◽  
Akihiro Doi ◽  
Eiichi Sato
Keyword(s):  
Millimeter Wave ◽  
Radio Telescope ◽  
Space Radio Telescope ◽  
Wave Space ◽  
Antenna Surface

Photonic Millimeter-wave generation Developments for the ALMA Radio Telescope

2007 ◽  
Author(s):  
Hitoshi Kiuchi ◽  
Tetsuya Kawanishi ◽  
Masumi Yamada ◽  
Takahide Sakamoto ◽  
Masahiro Tsuchiya ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Radio Telescope ◽  
Wave Generation

scholarly journals Pulsar Timing with the Parkes Radio Telescope for the Fermi Mission

2010 ◽  
Vol 27 (1) ◽  
pp. 64-75 ◽  
Author(s):  
P. Weltevrede ◽  
S. Johnston ◽  
R. N. Manchester ◽  
R. Bhat ◽  
M. Burgay ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Gamma Rays ◽  
Gamma Ray ◽  
First Year ◽  
Space Telescope ◽  
Pulsar Timing ◽  
Prime Target

AbstractWe report here on two years of timing of 168 pulsars using the Parkes radio telescope. The vast majority of these pulsars have spin-down luminosities in excess of 1034 erg s−1 and are prime target candidates to be detected in gamma-rays by the Fermi Gamma-Ray Space Telescope. We provide the ephemerides for the ten pulsars being timed at Parkes which have been detected by Fermi in its first year of operation. These ephemerides, in conjunction with the publicly available photonlist, can be used to generate gamma-ray profiles from the Fermi archive. We will make the ephemerides of any pulsars of interest available to the community upon request. In addition to the timing ephemerides, we present the parameters for 14 glitches which have occurred in 13 pulsars, seven of which have no previously known glitch history.The Parkes timing programme, in conjunction with Fermi observations, is expected to continue for at least the next four years.

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