Discovery of a 136 Millisecond Radio and X-Ray Pulsar in Supernova Remnant G54.1+0.3

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https://iopscience.iop.org/article/10.1086/342351

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https://doi.org/10.1086/342351
 http://hdl.handle.net/11603/19618

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UMBC Physics Department
UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Joint Center for Earth Systems Technology (JCET)

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2002-06-26

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journal articles preprints
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F. Camilo et al., Discovery of a 136 Millisecond Radio and X-Ray Pulsar in Supernova Remnant G54.1+0.3, ApJ 574 L71 (2002), doi: https://doi.org/10.1086/342351

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Abstract

We report the discovery of a pulsar with period P = 136 ms and dispersion measure 308 cm⁻³ pc in a deep observation of the supernova remnant (SNR) G54.1+0.3 with the Arecibo radio telescope. Timing measurements of the new pulsar, J1930+1852, reveal a characteristic age of P/2img1.gif = 2900 yr and a spin-down luminosity of img2.gif = 1.2 × 10³⁷ ergs s⁻¹. We have subsequently searched archival ASCA X-ray data of this SNR and detect pulsations with a consistent period. These findings ensure that PSR J1930+1852 is the pulsar that powers the "Crab-like" SNR G54.1+0.3. Together with existing Chandra observations of the SNR, we derive an X-ray pulsed fraction (2-10 keV) of ≈27%. We also find that the cooling efficiency of the pulsar wind nebula (PWN) is intermediate between those of the Vela and Crab PWNe: LX(2-10 keV) ~ 0.002img2.gif. PSR J1930+1852 is a very weak radio source, with a period-averaged flux density at 1180 MHz of 60 μJy. For a distance of 5 kpc, its luminosity, ~1 mJy kpc², is among the lowest for known young pulsars.