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

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$\alpha$. In this paper, we report the detection of a double-peaked feature in the H$\alpha$ line in the nucleus of the galaxy NGC 4958. The narrow line region of this object has an emission that is typical of a LINER galaxy, which is the usual classification for double-peaked emitters. A central broad component, related to the broad line region (BLR) 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 ${\xi }_{\mathrm{i}}$ = 570$\pm$ 83, an outer radius ${\xi }_{\mathrm{o}}$ = 860$\pm$170 (both in units of $G{M}_{\mathrm{SMBH}}/c^2$), an inclination to the line of sight $i$ = 27.2${}^o\pm$0.7${}^o$ and a local broadening parameter $\sigma$ = 1310$\pm$70 km s${}^{-1}$.

9 pages, 4 figures, 3 tables, accepted for publication in MNRAS

References in corpus (10)

• The Host Galaxies and Classification of Active Galactic Nuclei
• HyperLEDA. III. The catalogue of extragalactic distances
• Evolutionary stellar population synthesis with MILES - II. Scaled-solar and α-enhanced models
• Kinematics of the Local Universe XIII. 21-cm line measurements of 452 galaxies with the Nançay radiotelescope, JHK Tully-Fisher relation and preliminary maps of the peculiar velocity field
• Double-peaked profiles: ubiquitous signatures of disks in the Broad Emission Lines of Active Galactic Nuclei
• PCA Tomography: how to extract information from datacubes
• A treatment procedure for VLT/SINFONI data cubes: application to NGC 5643
• A treatment procedure for GMOS/IFU data cubes: application to NGC 2835
• Evolution of the accretion disk around the supermassive black hole of NGC 7213
• Short timescale variations of the Hα double-peaked profile of the nucleus of NGC 1097

Cited by in corpus (1)

• The DIVING${}^{3D}$ Survey -- Deep IFS View of Nuclei of Galaxies -- I. Definition and Sample Presentation