X-ray pulsations from the central source in Puppis A

George Pavlov, V. E. Zavlin, J. Trümper

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

There are several supernova remnants that contain unresolved X-ray sources close to their centers, presumably radio-quiet neutron stars. To prove that these objects are indeed neutron stars, to understand the origin of their X-ray radiation, and to explain why they are radio quiet, one should know their periods and period derivatives. We searched for pulsations of the X-ray flux from the radio-quiet neutron star candidate RX J0822-4300 near the center of the Puppis A supernova remnant observed with the ROSAT PSPC and HRI. A standard timing analysis of the separate PSPC and HRI data sets does not allow one to detect the periodicity unequivocally. However, a thorough analysis of the two observations separated by 4.56 yr enabled us to find a statistically significant period of P ≃ 75.3 ms and its derivative P ≃ 1.49 x 10 13 s s-1. The corresponding characteristic parameters of the neutron star-age τ = P/(2P) = 8.0 kyr, magnetic field B = 3.4 x 1012 G, and rotational energy loss E = 1.4 x 1037 ergs s-1 - are typical for young radio pulsars. Since the X-ray radiation has a thermal-like spectrum, its pulsations may be due to a nonuniform temperature distribution over the neutron star surface caused by anisotropy of the heat conduction in the strongly magnetized crust.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume511
Issue number1 PART 2
StatePublished - Jan 20 1999

Fingerprint

neutron stars
radio
supernova remnants
x rays
erg
periodicity
radiation
anisotropy
conductive heat transfer
pulsars
crust
periodic variations
magnetic field
crusts
temperature distribution
energy dissipation
time measurement
energy
magnetic fields
temperature

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Pavlov, G., Zavlin, V. E., & Trümper, J. (1999). X-ray pulsations from the central source in Puppis A. Astrophysical Journal, 511(1 PART 2).
Pavlov, George ; Zavlin, V. E. ; Trümper, J. / X-ray pulsations from the central source in Puppis A. In: Astrophysical Journal. 1999 ; Vol. 511, No. 1 PART 2.
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Pavlov, G, Zavlin, VE & Trümper, J 1999, 'X-ray pulsations from the central source in Puppis A', Astrophysical Journal, vol. 511, no. 1 PART 2.

X-ray pulsations from the central source in Puppis A. / Pavlov, George; Zavlin, V. E.; Trümper, J.

In: Astrophysical Journal, Vol. 511, No. 1 PART 2, 20.01.1999.

Research output: Contribution to journalArticle

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Pavlov G, Zavlin VE, Trümper J. X-ray pulsations from the central source in Puppis A. Astrophysical Journal. 1999 Jan 20;511(1 PART 2).