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Introduction of Fast Radiometry at RATAN-600 for Studying Pulsar Radiation
The mode of fast radiometry with a discretization interval from 60 to 490
μs was implemented at the RATAN-600 radio telescope at a frequency of 4.7 GHz.
For the first time ever, we detected single impulses from the close pulsar
PSR0329+54 in the Southern sector and the young pulsar PSR0534+22 in the Crab
Nebula in the Western sector. In the survey on the search for fast radio
outbursts at the Western sector, we detected five single giant impulses (GI)
from the 33-millisecond pulsar PSR0534+22 in the Crab Nebula at a multipath
spectral complex with high temporal resolution in the 4.2-4.8 GHz frequency
band. On June 30, 2018, the flow of GI (∼1 ms) exceeded 150 Jy, while the
average impulse flows are below 10 mJy. From the time shift of the impulse
arrival the dispersion was measured: DM = 57±1 pc/cm3 which is in good
agreement with previous measurements. The GI detected in observations on
October 2, 2018 consisted of two sub-impulses with a flux of about 8 and 4 Jy
and a duration of 300 μs separated by 400 ms. It follows that the area of
impulse radiation has a size of about 100 km, and its brightness temperature
exceeds 1025 K. Using the fast radiometry mode and the "source-tracking" mode
for 100-200 s will allow us to determine average fluxes and impulse profiles
of pulsars at 4.7 GHz with the RATAN-600 radio telescope.
Authors:
Trushkin S.A., Tsybulev P.G., Bursov N.N., Nizhelskij N.A. (SAO RAS).
In detail
Integrated Information System to Maintain Observations at SAO RAS Telescopes
An integrated information support system for maintaining observatory telescopes
has been implemented; it consists of the following web tools: submitting
telescope-time proposals (Russian and English versions), scheduling
observations (Russian and English versions) and supporting their archives,
electronic observation logs with the report preparation on sets. The
applications use a common database that stores information about applicants,
observers, proposals, observation programs, etc. The applications support
service functions for three groups of users in accordance with the roles assigned
to them – "user", "expert", and "administrator". This distributed system
provides CSRFC/USI SAO RAS users with web interfaces to support individual stages
of the observation cycle, provides increasing the efficiency of using telescopes
operated by RTTAC. The development was carried out using the DBMS PostgreSQL and
the perl, PHP, JavaScript programming languages including CSS.
Authors:
VitkovskijV.V., Plyaskina T. A., Zhelenkova O.P., Shergin V. S. (SAO RAS).
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