Poster abstract details

Searching and timing of pulsars in the globular cluster M15
A. Ridolfi, P. Freire, M. Kramer, P. Torne


Globular clusters (GCs) are spherical, gravitationally bound groups of stars which are very often home of a number of pulsars. Their very high densities, especially near their cores, make GCs also ideal environments for the formation and disruption of binary systems and for the spin-up of pulsars through accretion processes. M15 is the fourth-richest globular cluster in terms of the number of pulsars, boasting 7 isolated pulsars and 1 binary pulsar in a double neutron star system, M15C. This latter is of particular interest because it shows evidence of geodetic precession occurring, an effect predicted by General Relativity. In this poster we present our attempt to model the geodetic precession effect in M15C through the study of the evolution of the integrated pulse profile over a large time span. In addition to this, we present the results of our search for new tight pulsar binaries in M15, using data taken at the 305-m Arecibo radio telescope in Puerto Rico.