Volume 574, February 2015
|Number of page(s)||4|
|Published online||12 February 2015|
Analysis of time series in space maser signals⋆
1 Department of Physics, State University of Civil Aviation, St.-Petersburg, Russia
2 National Research University of Information Technologies, Mechanics and Optics, St.-Petersburg, Russia
3 Radio Astronomy Observatory of Lebedev Physical Institute of the Russian Academy of Sciences, Pushchino, Russia
4 Teknavo Group, St.-Petersburg, Russia
Received: 22 July 2014
Accepted: 12 December 2014
Many astrophysical sources that emit narrow radio-frequency spectral lines are believed to be sets of molecular condensation, each of which works as a maser, so that the whole set produces a characteristic spectrum. The forms of these spectra vary with time on various time-scales from months to dozens of minutes. We analysed the ultra-short variations of the separate components of space maser spectra in search for the periodical behaviour. We used a consecutive statistical analysis of the observation data that includes fast Fourier transformations (FFTs), a Lomb-Scargle procedure, and a modified Lomb-Scargle procedure. In at least 8 of the 49 sources we studied, we found that the intensity of one of the components of a space maser spectrum that corresponds to a single condensation changes periodically with a period of dozens of minutes or hours. Three sources had a period of 68 min; in one source the oscillations lasted at least four days.
Key words: gravitational waves / masers / binaries: close
FITS data are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (184.108.40.206) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/574/L2
© ESO, 2015
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