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Neutron Stars From Young Nearby Associations: The Origin of RX J1605.3+3249

Published online by Cambridge University Press:  02 January 2013

N. Tetzlaff ,
J. G. Schmidt ,
M. M. Hohle  and
R. Neuhäuser
N. Tetzlaff*
Affiliation:
Astrophysikalisches Institut undUniversitäts-Sternwarte Jena, Schillergässchen 2-3, 07745 Jena, Germany
J. G. Schmidt
Affiliation:
Astrophysikalisches Institut undUniversitäts-Sternwarte Jena, Schillergässchen 2-3, 07745 Jena, Germany
M. M. Hohle
Affiliation:
Astrophysikalisches Institut undUniversitäts-Sternwarte Jena, Schillergässchen 2-3, 07745 Jena, Germany
R. Neuhäuser
Affiliation:
Astrophysikalisches Institut undUniversitäts-Sternwarte Jena, Schillergässchen 2-3, 07745 Jena, Germany
*
BCorresponding author. Email: [email protected]
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Abstract

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Many neutron stars (NSs) and runaway stars apparently come from the same regions on the sky. This suggests that they share the same birth places, namely associations and clusters of young massive stars. To identify NS birth places, we attempt to find NS-runaway pairs that could be former companions that were disrupted in a supernova (SN). The remains of recent (<few Myr) nearby (<150 pc) SNe should still be identifiable by observing the emission of rare radioisotopes such as 26Al and 60Fe that can also be used as additional indicators to confirm a possible SN event. We investigated the origin of the isolated NS RX J1605.3+3249 and found that it was probably born ≈ 100 pc far from Earth 0.45 Myr ago in the extended Corona Australis or Octans associations, or in Sco OB4 ≈ 1 kpc 3.5 Myr ago. A SN in Octans is supported by the identification of one to two possible former companions—the runaway stars HIP 68228 and HIP 89394—as well as the appearance of a feature in the γ-ray emission from 26Al decay at the predicted SN place. Both, the progenitor masses estimated by comparison with theoretical 26Al yields as well as derived from the lifetime of the progenitor star, are found to be ≈ 11M⊙.

Keywords

pulsars: individual (RX J1605.3+3249)stars: kinematicssupernovae: general
Type
Research Front: Astronomy with Radioactivities
Information
Publications of the Astronomical Society of Australia , Volume 29 , Issue 2 , 2012 , pp. 98 - 108
Copyright
Copyright © Astronomical Society of Australia 2012

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