Old but Still Warm: Far-UV Detection of PSR B0950+08

G. G. Pavlov, B. Rangelov, O. Kargaltsev, A. Reisenegger, S. Guillot, C. Reyes

Research output: Contribution to journalArticle

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Abstract

We report on a Hubble Space Telescope detection of the nearby, old pulsar B0950+08 (pc, spin-down age 17.5 Myr) in two far-ultraviolet (FUV) bands. We measured the mean flux densities nJy and 83 ± 14 nJy in the F125LP and F140LP filters (pivot wavelengths 1438 and 1528). Using the FUV data together with previously obtained optical-UV data, we conclude that the optical-FUV spectrum consists of two components - a nonthermal (presumably magnetospheric) power-law spectrum () with slope and a thermal spectrum emitted from the bulk of the neutron star (NS) surface with a temperature in the range of (1-3) × 105 K, depending on interstellar extinction and NS radius. These temperatures are much higher than predicted by NS cooling models for such an old pulsar, which means that some heating mechanisms operate in NSs. A plausible mechanism responsible for the high temperature of PSR B0950+08 is the interaction of vortex lines of the faster rotating neutron superfluid with the slower rotating normal matter in the inner NS crust (vortex creep heating).

Original languageEnglish (US)
Article number79
JournalAstrophysical Journal
Volume850
Issue number1
DOIs
StatePublished - Nov 20 2017

Fingerprint

neutron stars
vortex
pulsars
heating
vortices
pivots
interstellar extinction
creep
power law
ultraviolet spectra
temperature
extinction
Hubble Space Telescope
crust
filter
cooling
wavelength
crusts
flux density
slopes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Pavlov, G. G., Rangelov, B., Kargaltsev, O., Reisenegger, A., Guillot, S., & Reyes, C. (2017). Old but Still Warm: Far-UV Detection of PSR B0950+08. Astrophysical Journal, 850(1), [79]. https://doi.org/10.3847/1538-4357/aa947c
Pavlov, G. G. ; Rangelov, B. ; Kargaltsev, O. ; Reisenegger, A. ; Guillot, S. ; Reyes, C. / Old but Still Warm : Far-UV Detection of PSR B0950+08. In: Astrophysical Journal. 2017 ; Vol. 850, No. 1.
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Pavlov, GG, Rangelov, B, Kargaltsev, O, Reisenegger, A, Guillot, S & Reyes, C 2017, 'Old but Still Warm: Far-UV Detection of PSR B0950+08', Astrophysical Journal, vol. 850, no. 1, 79. https://doi.org/10.3847/1538-4357/aa947c

Old but Still Warm : Far-UV Detection of PSR B0950+08. / Pavlov, G. G.; Rangelov, B.; Kargaltsev, O.; Reisenegger, A.; Guillot, S.; Reyes, C.

In: Astrophysical Journal, Vol. 850, No. 1, 79, 20.11.2017.

Research output: Contribution to journalArticle

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Pavlov GG, Rangelov B, Kargaltsev O, Reisenegger A, Guillot S, Reyes C. Old but Still Warm: Far-UV Detection of PSR B0950+08. Astrophysical Journal. 2017 Nov 20;850(1). 79. https://doi.org/10.3847/1538-4357/aa947c