A VLBI Proper Motion Analysis of the Recoiling Supermassive Black Hole Candidate Mrk 1018

Abstract

Mrk 1018 is a nearby changing-look AGN that has oscillated between spectral Type 1.9 and Type 1 over a period of 40 years. Recently, a recoiling supermassive black hole (rSMBH) scenario has been proposed to explain the spectral and flux variability observed in this AGN. Detections of rSMBHs are important for understanding the processes by which SMBH binaries merge and how rSMBHs influence their galactic environment through feedback mechanisms. However, conclusive identification of any rSMBHs has remained elusive to date. In this paper, we present an analysis of 6.5 years of multi-frequency Very Long Baseline Array (VLBA) monitoring of Mrk 1018. We find that the radio emission is compact down to 2.4 pc, and displays flux density and spectral variability over the length of our campaign, typical of a flat spectrum radio core. We observe proper motion in RA of the radio core at -36.4 $\pm$ 8.6 $\mu$as yr${}^{-1}$ (4.2$\sigma$), or $0.10c\pm 0.02c$ at the redshift of Mrk 1018. No significant proper motion is found in DEC (31.3 $\pm$ 25.1 $\mu$as yr${}^{-1}$). We discuss possible physical mechanisms driving the proper motion, including a rSMBH. We conclude that the apparent velocity we observe of the VLBI radio core is too high to reconcile with theoretical predictions of rSMBH velocities and that the proper motion is most likely dominated by an unresolved, outflowing jet component. Future observations may yet reveal the true nature of Mrk 1018. However, our observations are not able to confirm it as a true rSMBH.

arXiv comment17 pages, 7 figures, 3 tables; accepted for publication in ApJ

References in corpus (48)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• The NumPy array: a structure for efficient numerical computation
• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• Detailed Decomposition of Galaxy Images. II. Beyond Axisymmetric Models
• CASA, the Common Astronomy Software Applications for Radio Astronomy
• The NANOGrav 12.5-year Data Set: Search For An Isotropic Stochastic Gravitational-Wave Background
• A multi-scale multi-frequency deconvolution algorithm for synthesis imaging in radio interferometry
• A Compact Supermassive Binary Black Hole System
• An Accurate Flux Density Scale from 50 MHz to 50 GHz
• The third realization of the International Celestial Reference Frame by very long baseline interferometry
• Explaining changing-look AGN with state transition triggered by rapid mass accretion rate drop
• Hangup Kicks: Still Larger Recoils by Partial Spin/Orbit Alignment of Black-Hole Binaries
• Gravitational Recoil From Accretion-Aligned Black-Hole Binaries
• The effect of gravitational-wave recoil on the demography of massive black holes
• Microarcsecond VLBI pulsar astrometry with PSR$\pi$ II. parallax distances for 57 pulsars
• A Maximum Stellar Surface Density in Dense Stellar Systems
• Recoiling Black Holes in Merging Galaxies: Relationship to AGN Lifetimes, Starbursts, and the M-sigma Relation
• Orbital Motion in the Radio Galaxy 3C 66B: Evidence for a Supermassive Black Hole Binary
• The Close AGN Reference Survey (CARS) - Mrk 1018 returns to the shadows after 30 years as a Seyfert 1
• A supermassive binary black hole in the quasar 3C345
• Statistical analyses of long-term variability of AGN at high radio frequencies
• The local radio-galaxy population at 20 GHz
• Effects of gravitational-wave recoil on the dynamics and growth of supermassive black holes
• High Frequency Peakers: young radio sources or flaring blazars?
• The VLA Survey of the Chandra Deep Field South. IV. Source Population
• Parsec-scale jet precession in BL Lacertae (2200+420)
• The Close AGN Reference Survey (CARS) - What is causing Mrk1018's return to the shadows after 30 years?
• A spinning supermassive black hole binary model consistent with VLBI observations of the S5 1928+738 jet
• Detection of jet precession in the active nucleus of M81
• Spikey: Self-Lensing Flares from Eccentric SMBH Binaries
• The inner jet of radio galaxy NGC 315 as observed with Chandra and the VLA
• Kinematics of the parsec-scale radio jet in 3C48
• Explaining temporal variations in the jet position angle of the blazar OJ 287 using its binary black hole central engine model
• Recoiling supermassive black hole in changing-look AGN Mrk 1018
• Spectral variability in faint high frequency peakers
• On the connection of the apparent proper motion and the VLBI structure of compact radio sources
• Long-term variability of extragalactic radio sources in the Planck Early Release Compact Source Catalogue
• The NANOGrav 11yr Data Set: Limits on Supermassive Black Hole Binaries in Galaxies within 500Mpc
• Insight Into "Changing-Look" AGN Mrk 1018 from the Fe K$\alpha$ Line: The Reprocessing Gas Has Yet to Fully Respond to the Fading of the AGN
• Long-term and multi-wavelength evolution of a changing-look AGN Mrk 1018
• A Curved 150 Parsec Long Jet in the Double-Peaked Emission-Line AGN KISSR 434
• Long-Term Evolution of and X-ray Emission from a Recoiling Supermassive Black Hole in a Disk Galaxy
• Exploring the Morphology and Origins of the 4C 38.41 Jet
• The Position/Structure Stability of Four ICRF2 Sources
• Unprecedented change in the position of four radio sources
• Spectropolarimetry of the changing-look active galactic nucleus Mrk 1018
• The parsec-scale jet of the neutrino-emitting blazar TXS~0506+056
• Interstellar Scintillation of an Extreme Scintillator: PKS B1144-379

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• Changing-Look Inspirals: Trends and Switches in AGN Disk Emission as Signposts for Merging Black Hole Binaries