UVOIR Spectrum, X-Ray Emission, and Proper Motion of the Isolated Neutron Star RX J2143.0+0654 * * Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program #17476

Pavlov, GG; Abramkin, V; Posselt, B

Journal article

UVOIR Spectrum, X-Ray Emission, and Proper Motion of the Isolated Neutron Star RX J2143.0+0654 * * Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program #17476

Abstract:: We observed the isolated neutron star (NS) RX J2143.0+0654 with the Hubble Space Telescope (HST) in the UVOIR wavelength range (0.14–1.7 μm). The UV part is consistent with a Rayleigh–Jeans tail of a thermal spectrum, fν ∝ ν2, while a power-law spectrum, fν ∝ να with α ∼ −0.8, dominates in the near-IR–optical. A joint fit of the UVOIR and contemporaneous X-ray spectra with a two-component blackbody with possible absorption features + power-law optical spectrum yields the following temperature and apparent radius of the colder component (which gives the main contribution in the UV): kTcold ≈ 45 eV and Rcold ≈ 6d260 km, where d260 is the distance in units of 260 pc. The temperature and radius of the hotter component, kThot ≈ 106 eV and Rhot ≈ 1.5d260 km; the parameters of an absorption feature at 0.74 keV; and the properties of X-ray pulsations are the same as found in previous X-ray observations. In the near-IR images, the NS is possibly surrounded by extended emission with a characteristic size of ∼2″ and flux densities of about 1.7 and 0.9 μJy at 1.54 and 1.15 μm, respectively. Comparison with a previous HST observation in the optical 14 yr ago shows a proper motion μ ≈ 6 mas yr−1, which corresponds to a small transverse velocity of 7d260 km s−1. It is consistent with the hypothesis that the NS was born in the vicinity of the solar system about 0.5 Myr ago.

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Peer review status:: Peer reviewed

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APA Style

Pavlov, G. G., Abramkin, V., & Posselt, B. (2025). UVOIR Spectrum, X-Ray Emission, and Proper Motion of the Isolated Neutron Star RX J2143.0+0654 * * Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program #17476. The Astrophysical Journal, 996(1).

MLA Style

Pavlov, GG, et al. “UVOIR Spectrum, X-Ray Emission, and Proper Motion of the Isolated Neutron Star RX J2143.0+0654 * * Based on Observations Made with the NASA/ESA Hubble Space Telescope, Obtained at the Space Telescope Science Institute, Which Is Operated by the Association of Universities for Research in Astronomy, Inc., under NASA Contract NAS 5-26555. These Observations Are Associated with Program #17476.” The Astrophysical Journal, vol. 996, no. 1, 2025.

Chicago Style

Pavlov, GG, V Abramkin, and B Posselt. 2025. “UVOIR Spectrum, X-Ray Emission, and Proper Motion of the Isolated Neutron Star RX J2143.0+0654 * * Based on Observations Made with the NASA/ESA Hubble Space Telescope, Obtained at the Space Telescope Science Institute, Which Is Operated by the Association of Universities for Research in Astronomy, Inc., under NASA Contract NAS 5-26555. These Observations Are Associated with Program #17476.” The Astrophysical Journal 996 (1).
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