Volume 394, Number 2, November I 2002
|Page(s)||633 - 639|
|Section||Interstellar and circumstellar matter|
|Published online||15 October 2002|
Subaru optical observations of the old pulsar PSR B0950+08*
Observatorio Astronomico Nacional SPM, Instituto de Astronomia, UNAM, Ensenada, BC, Mexico e-mail: email@example.com
2 Ioffe Physical Technical Institute, Politekhnicheskaya 26, St. Petersburg, 194021, Russia e-mail: firstname.lastname@example.org; email@example.com
3 Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
4 RIKEN (Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan e-mail: firstname.lastname@example.org, email@example.com
5 Special Astrophysical Observatory of RAS, Karachai-Cherkessia, Nizhnij Arkhyz, 357167, Russia
6 Isaac Newton Institute of Chile, SAO Branch, Russia e-mail: firstname.lastname@example.org, email@example.com
7 Department of Physics, Yamagata University, Yamagata 990-8560, Japan e-mail: firstname.lastname@example.org
8 Department of Physics, Rikkyo University, Nishi-Ikebukuro, Tokyo 171-8501, Japan e-mail: email@example.com
Corresponding author: Yu. A. Shibanov, firstname.lastname@example.org
Accepted: 8 August 2002
We report the B band optical observations of an old ( Myr) radiopulsar PSR B0950+08 obtained with the Suprime-Cam at the Subaru telescope. We detected a faint object, . Within our astrometrical accuracy it coincides with the radio position of the pulsar and with the object detected earlier by Pavlov et al. ([CITE]) in UV with the HST /FOC/F130LP. The positional coincidence and spectral properties of the object suggest that it is the optical counterpart of PSR B0950+08. Its flux in the B band is two times higher than one would expect from the suggested earlier Rayleigh-Jeans interpretation of the only available HST observations in the adjacent F130LP band. Based on the B and F130LP photometry of the suggested counterpart and on the available X-ray data we argue in favour of nonthermal origin of the broad-band optical spectrum of PSR B0950+08, as it is observed for the optical emission of the younger, middle-aged pulsars PSR B0656+14 and Geminga. At the same time, the optical efficiency of PSR B0950+08, estimated from its spin-down power and the detected optical flux, is by several orders of magnitude higher than for these pulsars, and comparable with that for the much younger and more energetic Crab pulsar. We cannot exclude the presence of a compact, ~1´´, faint pulsar nebula around PSR B0950+08, elongated perpendicular to the vector of its proper motion, unless it is not a projection of a faint extended object on the pulsar position.
Key words: pulsars: general / pulsars: individual: PSR B0950+08 / stars: neutron
© ESO, 2002
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.