Pulsars, transients and relativistic astrophysics

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PESSTO monitoring of SN 2012hn: further heterogeneity among faint Type I supernovae★

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 437:2 (2014) 1519-1533

Authors:

S Valenti, F Yuan, S Taubenberger, K Maguire, A Pastorello, S Benetti, SJ Smartt, E Cappellaro, DA Howell, L Bildsten, K Moore, M Stritzinger, JP Anderson, S Benitez-Herrera, F Bufano, S Gonzalez-Gaitan, MG McCrum, G Pignata, M Fraser, A Gal-Yam, L Le Guillou, C Inserra, DE Reichart, R Scalzo, M Sullivan, O Yaron, DR Young
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Evidence of an asteroid encountering a pulsar

Astrophysical Journal Letters 780:2 (2014)

Authors:

PR Brook, A Karastergiou, S Buchner, SJ Roberts, MJ Keith, S Johnston, RM Shannon

Abstract:

Debris disks and asteroid belts are expected to form around young pulsars due to fallback material from their original supernova explosions. Disk material may migrate inward and interact with a pulsar's magnetosphere, causing changes in torque and emission. Long-term monitoring of PSR J0738-4042 reveals both effects. The pulse shape changes multiple times between 1988 and 2012. The torque, inferred via the derivative of the rotational period, changes abruptly from 2005 September. This change is accompanied by an emergent radio component that drifts with respect to the rest of the pulse. No known intrinsic pulsar processes can explain these timing and radio emission signatures. The data lead us to postulate that we are witnessing an encounter with an asteroid or in-falling debris from a disk. © 2014. The American Astronomical Society. All rights reserved.
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Detecting gravitational waves from the galactic center with Pulsar Timing

(2014)

Authors:

Alak Ray, Bence Kocsis, Simon Portegies Zwart
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The low or retrograde spin of the first extragalactic microquasar: implications for Blandford-Znajek powering of jets

(2014)

Authors:

Matthew Middleton, James Miller-Jones, Rob Fender
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Astronomy below the survey threshold in the SKA era

Proceedings of Science 9-13-June-2014 (2014)

Authors:

J Zwart, J Wall, A Karim, C Jackson, R Norris, J Condon, J Afonso, I Heywood, M Jarvis, F Navarrete, I Prandoni, E Rigby, H Rottgering, M Santos, M Sargent, N Seymour, R Taylor, T Vernstrom

Abstract:

Astronomy at or below the survey threshold has expanded significantly since the publication of the original Science with the Square Kilometer Array in 1999 and its update in 2004. The techniques in this regime may be broadly (but far from exclusively) defined as confusion or P(D) analyses (analyses of one-point statistics), and stacking, accounting for the flux-density distribution of noise-limited images co-added at the positions of objects detected/isolated in a different waveband. Here we discuss the relevant issues, present some examples of recent analyses, and consider some of the consequences for the design and use of surveys with the SKA and its pathfinders.
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