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Submillimetre observations of RXJ1856.5-3754

  • We report on submillimetre bolometer observations of the isolated neutron star RX J1856.5−3754 using the Large Apex Bolometer Camera bolometer array on the Atacama Pathfinder Experiment telescope. No cold dust continuum emission peak at the position of RX J1856.5−3754 was detected. The 3σ flux density upper limit of 5 mJy translates into a cold dust mass limit of a few earth masses. We use the new submillimetre limit, together with a previously obtained H-band limit, to constrain the presence of a gaseous, circumpulsar disc. Adopting a simple irradiated disc model, we obtain a mass accretion limit of Graphic and a maximum outer disc radius of ∼1014 cm. By examining the projected proper motion of RX J1856.5−3754, we speculate about a possible encounter of the neutron star with a dense fragment of the CrA molecular cloud a few thousand years ago.

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Document Type:Article
Author:B. Posselt, K. Schreyer, R. Perna, M. W. Sommer, B. Klein, P. Slane
Parent Title (English):MNRAS (Monthly Notices of the Royal Astronomical Society)
First Page:1840
Last Page:1844
Publisher:Oxford University Press
Date of first publication:2010/07/01
Tag:circumstellar matter; stars: individual: RXJ1856.5-3754
Departments, institutes and facilities:Fachbereich Elektrotechnik, Maschinenbau, Technikjournalismus
Dewey Decimal Classification (DDC):5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften
Entry in this database:2015/10/09