Pulsar searches of Fermi unassociated sources with the Effelsberg telescope

E. D. Barr 1 Lucas Guillemot 1, 2, 3 D. J. Champion 4 M. Kramer 1, 4 R. P. Eatough 1 K. J. Lee 1 J. P. W. Verbiest 1 C. G. Bassa 5 F. Camilo 4, 6 Ö. Çelik 7, 8 Ismaël Cognard 2, 3 E. C. Ferrara 8 P. C. C. Freire 1 G. H. Janssen 5 S. Johnston 9 M. Keith 9 A. G. Lyne 5 P. F. Michelson 10 P. M. Saz Parkinson 11 S. M. Ransom 12 P. S. Ray 13 B. W. Stappers 5 K. S. Wood 13
1 MPIFR - Max-Planck-Institut für Radioastronomie
2 USN - Unité Scientifique de la Station de Nançay
3 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
4 CAL - Columbia Astrophysics Laboratory
5 Jodrell Bank Centre for Astrophysics
6 NAIC - Arecibo Observatory, National Astronomy and Ionosphere Center
7 Department of Physics [Baltimore]
8 GSFC - NASA Goddard Space Flight Center
9 CSIRO Astronomy and Space Science
10 HEPL - Hansen Experimental Physics Laboratory
11 SCIPP - Santa Cruz Institute for Particle Physics
12 NRAO - National Radio Astronomy Observatory
13 NRL - Naval Research Laboratory
Abstract : Using the 100-m Effelsberg radio telescope operating at 1.36 GHz, we have performed a targeted radio pulsar survey of 289 unassociated gamma-ray sources discovered by the Large Area Telescope (LAT) aboard the Fermi satellite and published in the 1FGL catalogue (Abdo et al., 2010). This survey resulted in the discovery of millisecond pulsar J1745+1017, which resides in a short-period binary system with a low-mass companion, Mmin ~ 0.0137 Msun, indicative of `Black Widow' type systems. A two-year timing campaign has produced a refined radio ephemeris, accurate enough to allow for phase-folding of the LAT photons, resulting in the detection of a dual-peaked gamma-ray light-curve, proving that PSR J1745+1017 is the source responsible for the gamma-ray emission seen in 1FGL J1745.5 + 1018 (2FGL J1745.6+1015; Nolan et al., 2012). We find the gamma-ray spectrum of PSR J1745+1017 to be well modelled by an exponentially-cut-off power law with cut-off energy 3.2 GeV and photon index 1.6. The observed sources are known to contain a further 10 newly discovered pulsars which were undetected in this survey. Our radio observations of these sources are discussed and in all cases limiting flux densities are calculated. The reasons behind the seemingly low yield of discoveries are also discussed.
Keywords : pulsars: general gamma-rays: general pulsars: individual: PSR J1745+1017
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Journal articles
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E. D. Barr, Lucas Guillemot, D. J. Champion, M. Kramer, R. P. Eatough, et al.. Pulsar searches of Fermi unassociated sources with the Effelsberg telescope. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2013, 429 (2), pp.1633-1642. ⟨10.1093/mnras/sts449⟩. ⟨insu-01262022⟩

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