Black hole masses and starbursts in X-shaped radio sources

Abstract

It has been suggested that the X-shaped morphology observed in some radio sources can reflect either a recent merger of two supermassive black holes (SMBHs) or the presence of a second active black hole in the galactic nucleus. These scenarios are tested by studying the relationship between the black hole mass, radio and optical luminosity, starburst history, and dynamic age of radio lobes in a sample of 29 X-shaped radio galaxies drawn from a list of 100 X-shaped radio source candidates identified from the FIRST survey. The same relationships are also studied in a control sample consisting of 36 radio-loud active nuclei with similar redshifts and optical and radio luminosities. The X-shaped objects are found to have statistically higher black hole masses and older starburst activity compared to the objects from the control sample. Implications of these findings are discussed for the black hole merger scenario and for the potential presence of active secondary black holes in post-merger galaxies.

11 pages, 8 figures

References in corpus (5)

• FIRST `Winged' and `X'-shaped Radio Source Candidates
• The spin-flip phenomenon in supermassive black hole binary mergers
• GMRT observations of X-shaped radio sources
• A Large Sample of BL Lacs from SDSS and FIRST
• Black hole masses and starbursts in X-shaped radio sources

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• Optical and radio properties of extragalactic radio sources with recurrent jet activity
• A Candidate Dual AGN in a Double-peaked Emission-line Galaxy with Precessing Radio Jets
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• X-shaped Radio Galaxies: Optical Properties, Large-scale Environment and Relationship to Radio Structure
• A unified framework for X-shaped radio galaxies
• Observational Constraints on Correlated Star Formation and Active Galactic Nuclei in Late-Stage Galaxy Mergers
• Starbursts and black hole masses in X-shaped radio galaxies: Signatures of a merger event?
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• Multifrequency JVLA observations of the X-shaped radio galaxy in Abell 3670
• Study of Star-formation in Dual Nuclei Galaxies using UVIT observations
• Quasar Host Galaxies and the $M_{SMBH}$ - ${\sigma }_{\ast }$ Relation