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Victor Herrero Radio Astronomy Blog

A LOFAR Census of Millisecond Pulsars

14 Aug 2015, 01:32 UTC
A LOFAR Census of Millisecond Pulsars
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With many thanks I refer to:Kondratiev et al. 2015, "A LOFAR Census of Millisecond Pulsars"http://arxiv.org/abs/1508.02948http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1508.02948Abstract: "We report the detection of 48 millisecond pulsars (MSPs) out of 75 observed thus far using the LOFAR in the frequency range 110-188 MHz. We have also detected three MSPs out of nine observed in the frequency range 38-77 MHz. This is the largest sample of MSPs ever observed at these low frequencies, and half of the detected MSPs were observed for the first time at frequencies below 200 MHz. We present the average pulse profiles of the detected MSPs, their effective pulse widths and flux densities, and compare these with higher observing frequencies. The LOFAR pulse profiles will be publicly available via the EPN Database of Pulsar Profiles. We also present average values of dispersion measures (DM) and discuss DM and profile variations. About 35% of the MSPs show strong narrow profiles, another 25% exhibit scattered profiles, and the rest are only weakly detected. A qualitative comparison of the LOFAR MSP profiles with those at higher radio frequencies shows constant separation between profile components. Similarly, the profile widths are consistent with those observed at higher frequencies, unless scattering dominates at the lowest frequencies. This ...

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