Daily variability at milli-arcsecond scales in the radio quiet NLSy1 Mrk 110

Abstract

The origin of radio emission in the majority of Active Galactic Nuclei (AGN) is still poorly understood. Various competing mechanisms are likely involved in the production of radio emission and precise diagnostic tools are needed to disentangle them, of which variability is among the most powerful. For the first time, we show evidence for significant radio variability at 5 GHz at milli-arcsecond scales on days to weeks time scales in the highly accreting and extremely radio-quiet (RQ) Narrow Line Seyfert 1 (NLSy1) Mrk110. The simultaneous Swift/XRT light curve indicates stronger soft than hard X-ray variability. The short-term radio variability suggests that the GHz emitting region has a size smaller than ~180 Schwarzschild radii. The high brightness temperature and the radio and X-ray variability rule out a star-formation and a disc wind origin. Synchrotron emission from a low-power jet and/or an outflowing corona is then favoured.

7 pages, 2 figures, MNRAS, Volume 510, Issue 1, pp.718-724 - Improved version of fig. 1

References in corpus (16)

• Universal bolometric corrections for AGN over 7 luminosity decades
• The black hole mass - stellar velocity dispersion relation of narrow-line Seyfert 1 galaxies
• On the origin of radio emission in radio quiet quasars
• The X-ray and Radio Connection in Low-luminosity Active Nuclei
• Radio Variability in Seyfert Nuclei
• Star formation and nuclear activity in luminous infrared galaxies: An infrared through radio review
• On the multi-wavelength variability of Mrk 110: Two components acting at different timescales
• X-ray spectral variability of Seyfert 2 galaxies
• UV line driven disc wind as the origin of ultrafast outflows in AGN
• Near Infrared Variability of obscured and unobscured X-ray selected AGN in the COSMOS field
• LeMMINGs. II. The e-MERLIN legacy survey of nearby galaxies. The deepest radio view of the Palomar sample on parsec scale
• Multi-timescale reverberation mapping of Mrk 335
• Radiation pressure confinement -- V. The predicted free-free absorption and emission in active galactic nuclei
• The first simultaneous X-ray broad-band view of Mrk 110 with XMM-Newton and NuSTAR
• Simultaneous Millimeter-wave and X-ray monitoring of the Seyfert Galaxy NGC 7469
• The curious activity in the nucleus of NGC 4151: jet interaction causing variability?

Cited by in corpus (10)

• VLBI Observations of a sample of Palomar-Green quasars I: parsec-scale morphology
• The radio emission in radio-quiet quasars: the VLBA perspective
• Hard-X-ray-selected Active Galactic Nuclei -- II. Spectral Energy Distributions in the 5-45 GHz domain
• Quasi-simultaneous observations of radio and X-ray variability in three radio-quiet Seyfert galaxies
• The long-term broad-line responsivity in MKN 110
• Investigating Non-linear and Stochastic Hard X-ray Variability of Active Galactic Nuclei using Recurrence Analysis
• Compact and variable radio emission from an active galaxy with supersoft X-ray emission
• Time-domain Radio-loudness of Active Galactic Nuclei: Intermittency, Memory, and Jet Escape
• Non-thermal emission from fall-back clouds in the Broad-Line Region of Active Galactic Nuclei
• A radio, optical, UV and X-ray view of the enigmatic changing look Active Galactic Nucleus 1ES~1927+654 from its pre- to post-flare states