Revisiting the Parallax of the Isolated Neutron Star RX J185635-3754 Using HST/ACS Imaging
F.M. Walter, T. Eisenbeiss, J.M. Lattimer, B. Kim, V. Hambaryan, and, R. Neuhaeuser
TL;DR
This paper refines the distance measurement of the nearby isolated neutron star RX J185635-3754 using HST/ACS imaging, confirming previous estimates with improved astrometric analysis.
Contribution
It presents a new, precise parallax measurement of RX J185635-3754 using multiple independent methods with HST/ACS data.
Findings
Distance estimated at 123 (+11, -15) pc
Consistent results across five independent methods
Agreement with previous measurements
Abstract
We have redetermined the parallax and proper motion of the nearby isolated neutron star RX~J185635-3754. We used eight observations with the high resolution camera of the HST/ACS taken from 2002 through 2004. We performed the astrometric fitting using five independent methods, all of which yielded consistent results. The mean estimate of the distance is 123 (+11, -15) pc (1 sigma), in good agreement with our earlier published determination.
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