ar X iv : a st ro - p h / 96 06 16 9 v 1 2 7 Ju n 19 96 ASCA observations of Seyfert 1 galaxies : II . Relativistic Iron K α emission

ar X iv : a st ro - p h / 96 06 16 9 v 2 2 6 A ug 1 99 6 ASCA observations of Seyfert 1 galaxies : II . Relativistic Iron K α emission

We present evidence for widespread relativistic effects in the central regions of active galactic nuclei. In a sample of 18 Seyfert 1 galaxies observed by ASCA, 14 show an iron Kα line which is is resolved, with mean width σ Kα = 0.43 ± 0.12 keV for a gaussian profile (Full Width at Half Maximum, FWHM∼ 50, 000 km s −1). However, many of the line profiles are asymmetric. A strong red wing is ind...

ar X iv : a st ro - p h / 98 06 16 8 v 1 1 1 Ju n 19 98 Are the Nuclei of Seyfert 2 Galaxies Viewed Face - On ?

We show from modeling the Fe Kα line in the ASCA spectra of four X-ray bright narrow emission line galaxies (Seyfert types 1.9 and 2) that two equally viable physical models can describe the observed line profile. The first is discussed by Turner et al. (1998) and consists of emission from a nearly pole-on accretion disk. The second, which is statistically preferred, is a superposition of emiss...

ar X iv : a st ro - p h / 96 06 17 9 v 1 2 9 Ju n 19 96 LECTURE 1 Coalescence of Binary Neutron Stars

ar X iv : a st ro - p h / 97 08 23 1 v 1 2 5 A ug 1 99 7 ASCA observations of type - 2 Seyfert Galaxies : III Orientation and X - ray Absorption

We discuss the spectral properties of a sample of type-2 Seyfert galaxies based upon the analysis of ASCA data. In this paper we consider the sources for which the X-ray spectra appear to be dominated by the nuclear continuum, transmitted through a large column of absorbing material. We find that both Seyfert-2 galaxies and NELGs show iron Kα line profiles indicative of reprocessing of nuclear ...

ar X iv : a st ro - p h / 99 05 22 0 v 1 1 7 M ay 1 99 9 ASCA Observation of the Low - Luminosity Seyfert 1 . 5 Galaxy NGC 5033

We present the results of an ASCA observation of the low-luminosity Seyfert 1.5 galaxy NGC 5033. A point-like X-ray source with a luminosity of 2.3 × 10 erg s in the 2–10 keV band (at 18.7 Mpc; Tully 1988, AAA045.002.054) was detected at the nucleus. The X-ray light curve shows variability on a timescale of ∼ 10 s with an amplitude of ∼20%. The X-ray continuum is represented by a weakly absorbe...