Volume 488, Number 3, September IV 2008
|Page(s)||1027 - 1030|
|Section||Stellar structure and evolution|
|Published online||30 July 2008|
A possible optical counterpart to the old nearby pulsar J0108-1431 *
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK e-mail: email@example.com
2 Department of Astronomy and Astrophysics, Pennsylvania State University, PA 16802, USA e-mail: firstname.lastname@example.org
3 Department of Astronomy, University of Florida, 32611, USA e-mail: email@example.com
Accepted: 1 July 2008
Context. The multi-wavelength study of old (>100 Myr) radio pulsars holds the key to understanding the long-term evolution of neutron stars, including the advanced stages of neutron star cooling and the evolution of the magnetosphere. Optical/UV observations are particularly useful for such studies because they allow one to explore both thermal and non-thermal emission processes. In particular, studying the optical/UV emission constrains the temperature of the bulk of the neutron star surface, too cold to be measured in X-ray observations.
Aims. Aim of this work is to identify the optical counterpart of the very old (166 Myr) radio pulsar J0108-1431.
Methods. We have re-analyzed our original Very Large Telescope (VLT) observations, where a very faint object was tentatively detected close to the radio position, near the edge of a field galaxy.
Results. We found that the backward extrapolation of the PSR J0108-1431 proper motion recently measured by Chandra fits the position of this object. Based on that, we propose it as a viable candidate for the optical counterpart to PSR J0108-1431. The object fluxes (; ; ) are consistent with a thermal spectrum with a brightness temperature of ∼ K (for km at a distance of 130 pc), emitted from the bulk of the neutron star surface.
Conclusions. New optical observations are required to confirm the optical identification of PSR J0108-1431 and measure its spectrum.
Key words: astrometry / stars: pulsars: individual: PSR J0108-1431
© ESO, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.