Chandra observation of the anomalous X-ray pulsar 1E 1841-045

Mikio Morii, Rie Sato, Jun Kataoka, Nobuyuki Kawai

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

We present the results from a Chandra ACIS CC mode observation of an anomalous X-ray pulsar (AXP) 1E 1841-045. This was the first observation in which the pulsar spectrum over a wide energy range was spatially discriminated from the surrounding SNR, Kes 73. Like other AXPs, the phase-integrated spectrum was fitted well with a power-law plus blackbody model. The spectral parameters are Γ = 2.0 ± 0.3, kTBB = 0.44 ± 0.02 keV, and NH = 2.54-0.13+0.15 × 10 22cm-2. This photon index is the flattest among AXPs, and resembles soft gamma-ray repeaters (SGRs) in a quiescent state. The pulse profile is double-peaked, and we found that the second peak has a significantly hard spectrum. The spectra of all phases are consistent with a power-law plus blackbody model with a constant temperature and photon index. When fitted with a two-blackbody model, we obtained a similarly good fit. These results can be interpreted by saying that there are two emission regions with different energy spectra.

Original languageEnglish
JournalPublications of the Astronomical Society of Japan
Volume55
Issue number3
Publication statusPublished - 2003
Externally publishedYes

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pulsars
x rays
power law
repeaters
photons
energy spectra
gamma rays
energy
profiles
pulses
temperature
index

Keywords

  • ISM: individual (Kes 73)
  • ISM: supernova remnants
  • Stars: pulsars: individual (1E 1841-045)
  • X-rays: individual (1E 1841-045)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Chandra observation of the anomalous X-ray pulsar 1E 1841-045. / Morii, Mikio; Sato, Rie; Kataoka, Jun; Kawai, Nobuyuki.

In: Publications of the Astronomical Society of Japan, Vol. 55, No. 3, 2003.

Research output: Contribution to journalArticle

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AU - Sato, Rie

AU - Kataoka, Jun

AU - Kawai, Nobuyuki

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N2 - We present the results from a Chandra ACIS CC mode observation of an anomalous X-ray pulsar (AXP) 1E 1841-045. This was the first observation in which the pulsar spectrum over a wide energy range was spatially discriminated from the surrounding SNR, Kes 73. Like other AXPs, the phase-integrated spectrum was fitted well with a power-law plus blackbody model. The spectral parameters are Γ = 2.0 ± 0.3, kTBB = 0.44 ± 0.02 keV, and NH = 2.54-0.13+0.15 × 10 22cm-2. This photon index is the flattest among AXPs, and resembles soft gamma-ray repeaters (SGRs) in a quiescent state. The pulse profile is double-peaked, and we found that the second peak has a significantly hard spectrum. The spectra of all phases are consistent with a power-law plus blackbody model with a constant temperature and photon index. When fitted with a two-blackbody model, we obtained a similarly good fit. These results can be interpreted by saying that there are two emission regions with different energy spectra.

AB - We present the results from a Chandra ACIS CC mode observation of an anomalous X-ray pulsar (AXP) 1E 1841-045. This was the first observation in which the pulsar spectrum over a wide energy range was spatially discriminated from the surrounding SNR, Kes 73. Like other AXPs, the phase-integrated spectrum was fitted well with a power-law plus blackbody model. The spectral parameters are Γ = 2.0 ± 0.3, kTBB = 0.44 ± 0.02 keV, and NH = 2.54-0.13+0.15 × 10 22cm-2. This photon index is the flattest among AXPs, and resembles soft gamma-ray repeaters (SGRs) in a quiescent state. The pulse profile is double-peaked, and we found that the second peak has a significantly hard spectrum. The spectra of all phases are consistent with a power-law plus blackbody model with a constant temperature and photon index. When fitted with a two-blackbody model, we obtained a similarly good fit. These results can be interpreted by saying that there are two emission regions with different energy spectra.

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KW - X-rays: individual (1E 1841-045)

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