Ultraviolet emission from the millisecond pulsar J0437-4715

Oleg Kargaltsev, George G. Pavlov, Roger W. Romani

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

We observed PSR J0437-4715 with the FUV-MAMA detector of the Space Telescope Imaging Spectrometer (STIS) to measure the pulsar's spectrum and pulsations. For the first time, UV emission from a millisecond pulsar has been detected. The measured flux, (2.0 ± 0.2) × 10-15 ergs s-1 cm-2 in the 1150-1700 Å range, corresponds to the luminosity LFUV = (4.7 ± 0.5) × 1027 ergs s-1, for the distance of 140 pc and negligible interstellar extinction. The shape of the observed spectrum suggests thermal emission from the neutron star surface with a surprisingly high temperature of about 1 × 105 K, above the upper limit on the surface temperature of the younger "ordinary" pulsar J0108-1431. For the few-Gigayear-old J0437-4715, such a temperature requires a heating mechanism to operate. The spectrum of J0437-4715 shows marginal evidence of an emission line at 1372 Å, which might be a gravitationally redshifted Zeeman component of the hydrogen Lyα line in a magnetic field of ∼7 × 108 G. No pulsations are detected, with a 3 σ upper limit of 50% on the pulsed fraction.

Original languageEnglish (US)
Pages (from-to)327-335
Number of pages9
JournalAstrophysical Journal
Volume602
Issue number1 I
DOIs
StatePublished - Feb 10 2004

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ultraviolet emission
pulsars
erg
interstellar extinction
imaging spectrometers
thermal emission
neutron stars
surface temperature
spectrometer
extinction
luminosity
telescopes
hydrogen
magnetic field
heating
detectors
magnetic fields
temperature

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kargaltsev, Oleg ; Pavlov, George G. ; Romani, Roger W. / Ultraviolet emission from the millisecond pulsar J0437-4715. In: Astrophysical Journal. 2004 ; Vol. 602, No. 1 I. pp. 327-335.
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abstract = "We observed PSR J0437-4715 with the FUV-MAMA detector of the Space Telescope Imaging Spectrometer (STIS) to measure the pulsar's spectrum and pulsations. For the first time, UV emission from a millisecond pulsar has been detected. The measured flux, (2.0 ± 0.2) × 10-15 ergs s-1 cm-2 in the 1150-1700 {\AA} range, corresponds to the luminosity LFUV = (4.7 ± 0.5) × 1027 ergs s-1, for the distance of 140 pc and negligible interstellar extinction. The shape of the observed spectrum suggests thermal emission from the neutron star surface with a surprisingly high temperature of about 1 × 105 K, above the upper limit on the surface temperature of the younger {"}ordinary{"} pulsar J0108-1431. For the few-Gigayear-old J0437-4715, such a temperature requires a heating mechanism to operate. The spectrum of J0437-4715 shows marginal evidence of an emission line at 1372 {\AA}, which might be a gravitationally redshifted Zeeman component of the hydrogen Lyα line in a magnetic field of ∼7 × 108 G. No pulsations are detected, with a 3 σ upper limit of 50{\%} on the pulsed fraction.",
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Ultraviolet emission from the millisecond pulsar J0437-4715. / Kargaltsev, Oleg; Pavlov, George G.; Romani, Roger W.

In: Astrophysical Journal, Vol. 602, No. 1 I, 10.02.2004, p. 327-335.

Research output: Contribution to journalArticle

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