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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Detection of a double-peaked H alpha component from the accretion disc of NGC 4958

Full text
Author(s):
Ricci, T. V. [1] ; Steiner, J. E. [2]
Total Authors: 2
Affiliation:
[1] Univ Fed Fronteira Sul, BR-97900000 Cerro Largo, RS - Brazil
[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 486, n. 1, p. 1138-1145, JUN 2019.
Web of Science Citations: 0
Abstract

Active Galactic Nuclei are objects associated with the presence of an accretion disc around supermassive black holes found in the very central region of galaxies with awell-defined bulge. In the optical range of the spectrum, a possible signature of the accretion disc is the presence of a broad double-peaked component that is mostly seen in H alpha. In this paper, we report the detection of a double-peaked feature in the Ha line in the nucleus of the galaxy NGC 4958. The narrow-line region of this object has an emission that is typical of a low-ionization nuclear emission-line region galaxy, which is the usual classification for double-peaked emitters. A central broad component, related to the broad-line region of this object, is seen in H alpha and also in H beta. We concluded that the double-peaked emission is emitted by a circular relativistic Keplerian disc with an inner radius xi(i) = 570 +/- 83, an outer radius xi(o) = 860 +/- 170 (both in units of GM(SMBH/c)(2)), an inclination to the line of sight i = 27.2 +/- 0.7 degrees and a local broadening parameter sigma = 1310 +/- 70 km s(-1). (AU)

FAPESP's process: 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center
Grantee:Elisabete Maria de Gouveia Dal Pino
Support type: Multi-user Equipment Program
FAPESP's process: 11/51680-6 - Exploring the universe: from the galaxies formation to Earth-like planets with the Giant Magellan Telescope
Grantee:João Evangelista Steiner
Support type: Special Projects