Advantages of spectrum-röntgen-gamma and INTEGRAL for the study of narrow-line seyfert 1 galaxies

Research output: Contribution to journalArticle

Abstract

This paper summarizes the spectral and timing properties of narrow-line Seyfert 1 galaxies (NLS1) in view of recent ROSAT and ASCA observations. NLS1 have generally steeper soft (0.1-2.4 keV) X-ray continuum slopes than Seyfert 1s with broader lines, and there exists an anticorrelation between the 0.1-2.4 keV continuum slope and the FWHM of the Hβ line. Objects with steep 0.1-2.4 keV continuum slopes and Hβ FWHM > 3000 km s -1 are clearly discriminated against by nature. When simple power-law models are fit to ROSAT spectra, photon indices reach values up to about 5, much higher than is usually seen in Seyfert 1s. Interestingly, the hard (2-10 keV) X-ray continuum slopes tend also to be steeper in NLS1 compared to broad-lined Seyfert 1 galaxies. We also report evidence for giant and rapid soft X-ray variability in the narrow-line Seyfert 1 galaxy IRAS 13224-3809 and the narrow-line quasar PHL 1092. The advantages of Spectrum-Röntgen-Gamma (SRG) and INTEGRAL for the study of NLS1 are discussed.

Original languageEnglish (US)
Pages (from-to)60-61
Number of pages2
JournalPhysica Scripta T
Volume77
StatePublished - Dec 1 1998

Fingerprint

Galaxies
galaxies
Line
Slope
Continuum
slopes
continuums
H lines
Property of line
x rays
Quasars
Infrared Astronomy Satellite
Soft X-ray
quasars
time measurement
Timing
Power Law
Photon
Tend
photons

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

Cite this

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title = "Advantages of spectrum-r{\"o}ntgen-gamma and INTEGRAL for the study of narrow-line seyfert 1 galaxies",
abstract = "This paper summarizes the spectral and timing properties of narrow-line Seyfert 1 galaxies (NLS1) in view of recent ROSAT and ASCA observations. NLS1 have generally steeper soft (0.1-2.4 keV) X-ray continuum slopes than Seyfert 1s with broader lines, and there exists an anticorrelation between the 0.1-2.4 keV continuum slope and the FWHM of the Hβ line. Objects with steep 0.1-2.4 keV continuum slopes and Hβ FWHM > 3000 km s -1 are clearly discriminated against by nature. When simple power-law models are fit to ROSAT spectra, photon indices reach values up to about 5, much higher than is usually seen in Seyfert 1s. Interestingly, the hard (2-10 keV) X-ray continuum slopes tend also to be steeper in NLS1 compared to broad-lined Seyfert 1 galaxies. We also report evidence for giant and rapid soft X-ray variability in the narrow-line Seyfert 1 galaxy IRAS 13224-3809 and the narrow-line quasar PHL 1092. The advantages of Spectrum-R{\"o}ntgen-Gamma (SRG) and INTEGRAL for the study of NLS1 are discussed.",
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Advantages of spectrum-röntgen-gamma and INTEGRAL for the study of narrow-line seyfert 1 galaxies. / Boller, Th; Brandt, William Nielsen.

In: Physica Scripta T, Vol. 77, 01.12.1998, p. 60-61.

Research output: Contribution to journalArticle

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T1 - Advantages of spectrum-röntgen-gamma and INTEGRAL for the study of narrow-line seyfert 1 galaxies

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AU - Brandt, William Nielsen

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AB - This paper summarizes the spectral and timing properties of narrow-line Seyfert 1 galaxies (NLS1) in view of recent ROSAT and ASCA observations. NLS1 have generally steeper soft (0.1-2.4 keV) X-ray continuum slopes than Seyfert 1s with broader lines, and there exists an anticorrelation between the 0.1-2.4 keV continuum slope and the FWHM of the Hβ line. Objects with steep 0.1-2.4 keV continuum slopes and Hβ FWHM > 3000 km s -1 are clearly discriminated against by nature. When simple power-law models are fit to ROSAT spectra, photon indices reach values up to about 5, much higher than is usually seen in Seyfert 1s. Interestingly, the hard (2-10 keV) X-ray continuum slopes tend also to be steeper in NLS1 compared to broad-lined Seyfert 1 galaxies. We also report evidence for giant and rapid soft X-ray variability in the narrow-line Seyfert 1 galaxy IRAS 13224-3809 and the narrow-line quasar PHL 1092. The advantages of Spectrum-Röntgen-Gamma (SRG) and INTEGRAL for the study of NLS1 are discussed.

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