Chandra observations of NGC 4261 (3C 270): Revealing the Jet and hidden AGN in a type-2 liner

A Zezas, M Birkinshaw, DM Worrall, A Peters, G Fabbiano

Research output: Contribution to journalArticle (Academic Journal)peer-review

40 Citations (Scopus)

Abstract

We present results from a Chandra ACIS-S observation of the type 2 low-ionization nuclear emission-line region (LINER) radio galaxy NGC 4261 (3C 270). The X-ray data show that this galaxy hosts a heavily obscured (NH 8 × 1022 cm-2) active galactic nucleus (AGN) with an intrinsic luminosity of 2.4 × 1041 ergs s-1, which dominates the energy output of the nucleus but is much less than the Eddington luminosity of its central massive black hole. The multiwavelength properties of this component are consistent with either radiatively inefficient accretion flows or emission from the inner part of a jet within 20 mas (3.4 pc) from the nucleus. A softer, unobscured power-law component, which we identify as synchrotron X-ray emission related to the unobscured part of the inner jet, produces 10% of the 0.110.0 keV emission from the nucleus and is likely to be associated with the arcsecond-scale optical/UV emission measured with the Hubble Space Telescope (HST). These results indicate that the energy source of some type 2 LINERs could be a heavily obscured AGN, when obscuration of the ionizing continuum might be responsible for the low ionization state of the line-emitting gas.
Translated title of the contributionChandra observations of NGC 4261 (3C 270): Revealing the Jet and hidden AGN in a type-2 liner
Original languageEnglish
Pages (from-to)711 - 720
Number of pages10
JournalAstrophysical Journal
Volume627
Publication statusPublished - 2005

Bibliographical note

Publisher: The University of Chicago Press
Other: Submitted

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