Volume 389, Number 1, July I 2002
|Page(s)||L1 - L5|
|Published online||14 June 2002|
Letter to the Editor
Discovery of an optical bow-shock around pulsar B0740-28*
European Southern Observatory, Casilla 19001, Santiago 19, Chile, e-mail: email@example.com
2 Observatorio Cerro Calán, Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
3 Stichting ASTRON, 7990 Dwingeloo, The Netherlands e-mail: firstname.lastname@example.org
4 Sterrenkundig Instituut “Anton Pannekoek”, 1098 SJ Amsterdam, The Netherlands
5 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138, USA
Corresponding author: D. H. Jones, email@example.com
Accepted: 24 April 2002
We report the discovery of a faint Hα pulsar wind nebula (PWN) powered by the radio pulsar B0740-28. The characteristic bow-shock morphology of the PWN implies a direction of motion consistent with the previously measured velocity vector for the pulsar. The PWN has a flux density more than an order of magnitude lower than for the PWNe seen around other pulsars, but, for a distance 2 kpc, it is consistent with propagation through a medium of atomic density cm-3, and neutral fraction of 1%. The morphology of the PWN in the area close to the pulsar is distinct from that in downstream regions, as is also seen for the PWN powered by PSR B2224+65. In particular, the PWN associated with PSR B0740–28 appears to close at its rear, suggesting that the pulsar has recently passed through a transition from low density to high density ambient gas. The faintness of this source underscores that deep searches are needed to find further examples of optical pulsar nebulae.
Key words: ISM: general / pulsars: individual: B0740-28
© 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.