The flat X-ray spectrum of the LINER NGC1052

Abstract

We report on ROSAT and ASCA observations of the LINER NGC1052, which is the first one where broad optical lines in polarized light have been observed. The 2-10 keV spectrum is very flat, with an observed photon index (Gamma) ~0.1. A model where a nuclear source is - partly or totally - obscured by a screen of matter with column density ~10^23 atom/cm/cm is the most convincing explanation for the observed flatness. This agrees with the hypothesis that the LINERs are a population of low-luminosity AGN, to which the Seyfert unification scenario applies. The intrinsic spectral index is still rather flat (1.0-1.4), as observed in a few type-2 Seyferts so far or predicted if the accretion occurs in an advection-dominated flow.

5 pages, Latex, 2 Postscript figures, accepted for publication in MNRAS

References in corpus (3)

• The complex molecular absorption line system at z=0.886 towards PKS1830-211
• Detection of an iron K Emission Line from the LINER NGC 4579
• X-ray absorption in the strong FeII narrow-line Seyfert 1 galaxy Mrk 507

Cited by in corpus (25)

• X-ray Properties of LINERs and Low-luminosity Seyfert Galaxies Observed with ASCA. I. Observations and Results
• The Narrow-Line Regions of LINERs as Resolved with the Hubble Space Telescope
• The Twin--Jet System in NGC 1052: VLBI-Scrutiny of the Obscuring Torus
• The Shroud Around the Twin Radio Jets in NGC 1052
• Study of LINER sources with broad H(alpha) emission. X-ray properties and comparision to luminous AGN and X-ray binaries
• Hard X-ray Emission and the Ionizing Source in LINERs
• The Dense Plasma Torus Around the Nucleus of an Active Galaxy NGC 1052
• Jet emission in NGC1052 at radio, optical, and X-ray frequencies
• Discovery of Water Maser Emission in Five AGN and a Possible Correlation Between Water Maser and Nuclear 2-10 keV Luminosities
• ASCA Observations of "Type 2" LINERs: Evidence for a Stellar Source of Ionization
• Probing the Physics of Narrow Line Regions in Active Galaxies III: Accretion and Cocoon Shocks in the LINER NGC1052
• Positional Coincidence of H2O Maser and a Plasma Obscuring Torus in Radio Galaxy NGC 1052
• HST Observations and Photoionization Modeling of the LINER Galaxy NGC 1052
• X-ray Emission from the Prototypical LINER Galaxy NGC 1052
• Spectral Analysis of the Accretion Flow in NGC 1052 with Suzaku
• Dense Plasma Torus in the GPS Galaxy NGC 1052
• Long Term Wind-Driven X-Ray Spectral Variability of NGC 1365 with Swift
• Spatially Resolved HCN Absorption Features in the Circumnuclear Region of NGC 1052
• The inner view of NGC 1052 using multiple X-ray observations
• A broad HCO+ absorption line associated with the circumnuclear torus of NGC 1052
• Accretion and jets in a low luminosity AGN: the nucleus of NGC 1052
• The shroud around the "compact, symmetric" radio jets in NGC 1052
• Powering the Jets in NGC1052
• H_2O maser and a plasma obscuring torus in the radio galaxy NGC 1052
• Millimeter VLBI constraints on the central magnetic field and symmetric jet production in the twin-jet galaxy NGC 1052