2019/03/28 by T. V. Ricci, J. E. Steiner · 10 citations
Environmental Science · Physics and Astronomy · #Accretion (finance) #Active galactic nucleus #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Bulge #Emission spectrum #Galaxies: Formation, Evolution, Phenomena #Galaxy #Geometry #Line (geometry) #Line-of-sight #Physics #Plant Water Relations and Carbon Dynamics #RADIUS #Spectral line #Supermassive black hole #astro-ph.CO #astro-ph.GA
paper · pdf · doi:10.1093/mnras/stz919
published in Monthly Notices of the Royal Astronomical Society 486(1), 1138-1145 (Oxford University Press) · 9 pages, 4 figures, 3 tables, accepted for publication in MNRAS
openalex publication_date 2019/03/28 · arxiv created 2019/04/05 · arxiv updated 2019/04/08 · openalex created_date 2019/04/11 · openalex updated_date 2026/08/05
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 a well-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 α. In this paper, we report the detection of a double-peaked feature in the H α 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 α and also in H β. We concluded that the double-peaked emission is emitted by a circular relativistic Keplerian disc with an inner radius ξi = 570 ± 83, an outer radius ξo = 860 ± 170 (both in units of GMSMBH/c2), an inclination to the line of sight i = 27.2 ± 0.7° and a local broadening parameter σ = 1310 ± 70 km s−1.