X-ray Timing Observations of PSR J1930+1852 in the Crab-like SNR G54.1+0.3

Abstract

We present new X-ray timing and spectral observations of PSR J1930+1852, the young energetic pulsar at the center of the non-thermal supernova remnant G54.1+0.3. Using data obtained with the Rossi X-ray Timing Explorer and Chandra X-ray observatories we have derived an updated timing ephemeris of the 136 ms pulsar spanning 6 years. During this interval, however, the period evolution shows significant variability from the best fit constant spin-down rate of $\dot{P}=7.5112(6)\times 10^{-13}$ s s${}^{-1}$, suggesting strong timing noise and/or glitch activity. The X-ray emission is highly pulsed ($71\pm 5$ modulation) and is characterized by an asymmetric, broad profile ($\sim 70$ duty cycle) which is nearly twice the radio width. The spectrum of the pulsed emission is well fitted with an absorbed power law of photon index $\Gamma =1.2\pm 0.2$; this is marginally harder than that of the unpulsed component. The total 2-10 keV flux of the pulsar is $1.7\times 10^{-12}$ erg cm${}^{-2}$ s${}^{-1}$. These results confirm PSR J1930+1852 as a typical Crab-like pulsar.

14 pages with 7 figures included, accepted to ApJ

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