arXiv subjects

Shami Chatterjee

Publications and source records attributed to Shami Chatterjee.

128 records · Page 8Linked to original sources

arXiv2006

The Origin and Motion of PSR J0538+2817 in S147

We report on VLBA astrometry and CXO imaging of PSR J0538+2817 in the supernova remnant S147. We measure a parallax distance of $1.47^{+0.42}_{-0.27}$kpc along with a high-precision proper motion, giving a transverse velocity $V_\perp=400^{+114}_{-73}$km/s. A small extended wind nebula is detected around the pulsar; the symmetry axis of this structure suggests that the spin axis lies $12\arcdeg\pm4\arcdeg$ from the velocity vector (2-D), but the emission is too faint for robust model independent statements. The neutron star is hot, consistent with the young ~40kyr kinematic age. The pulsar progenitor is likely a runaway from a nearby cluster, with NGC 1960 (M36) a leading candidate.

astro-ph↗

arXiv2003

Pulsar bow shocks as probes of warm neutral gas

Pulsars have mean space velocities >~500 km/s. The consequent ram pressure results in tight confinement of the star's energetic wind, driving a bow shock into the surrounding medium. Pulsar bow shocks have long been regarded as a curiosity, but new optical and X-ray observations are both rapidly expanding the sample of such sources, and are offering new ways to probe the interaction between pulsars and their environments. Here we discuss some of these new results, and explain how these data can be used to probe the density and structure of neutral gas in the interstellar medium.

astro-ph↗