A compact core-jet structure in the changing-look Seyfert NGC 2617

Abstract

The nearby face-on spiral galaxy NGC 2617 underwent an unambiguous 'inside-out' multi-wavelength outburst in Spring 2013, and a dramatic Seyfert type change probably between 2010 and 2012, with the emergence of broad optical emission lines. To search for the jet activity associated with this variable accretion activity, we carried out multi-resolution and multi-wavelength radio observations. Using the very long baseline interferometric (VLBI) observations with the European VLBI Network (EVN) at 1.7 and 5.0 GHz, we find that NGC 2617 shows a partially synchrotron self-absorbed compact radio core with a significant core shift, and an optically thin steep-spectrum jet extending towards the north up to about two parsecs in projection. We also observed NGC 2617 with the electronic Multi-Element Remotely Linked Interferometer Network (e-MERLIN) at 1.5 and 5.5 GHz, and revisited the archival data of the Very Large Array (VLA) and the Very Long Baseline Array (VLBA). The radio core had a stable flux density of about 1.4 mJy at 5.0 GHz between 2013 June and 2014 January, in agreement with the expectation of a supermassive black hole in the low accretion rate state. The northern jet component is unlikely to be associated with the 'inside-out' outburst of 2013. Moreover, we report that most optically selected changing-look AGN at z<0.83 are sub-mJy radio sources in the existing VLA surveys at 1.4 GHz, and it is unlikely that they are more active than normal AGN at radio frequencies.

10 pages, 7 figures, accepted for publication in MNRAS

References in corpus (22)

• The Discovery of the First "Changing Look" Quasar: New Insights into the Physics & Phenomenology of AGN
• The Dynamic Evolution of Young Extragalactic Radio Sources
• Opacity in compact extragalactic radio sources and its effect on astrophysical and astrometric studies
• AGN Type-casting: Mrk 590 No Longer Fits the Role
• The destruction and recreation of the X-ray corona in a changing-look Active Galactic Nucleus
• Mid-infrared variability of changing-look AGN
• The SFXC software correlator for Very Long Baseline Interferometry: Algorithms and Implementation
• The Close AGN Reference Survey (CARS) - Mrk 1018 returns to the shadows after 30 years as a Seyfert 1
• Quasars That Have Transitioned from Radio-quiet to Radio-loud on Decadal Timescales Revealed by VLASS and FIRST
• Precise radio astrometry and new developments for the next generation of instruments
• Polarization of changing-look quasars
• The faint radio sky: VLBA observations of the COSMOS field
• LeMMINGs. II. The e-MERLIN legacy survey of nearby galaxies. The deepest radio view of the Palomar sample on parsec scale
• Revisiting the birth locations of pulsars B1929+10, B2020+28,and B2021+51
• The nearby luminous transient AT2018cow: a magnetar formed in a sub-relativistically expanding non-jetted explosion
• Caltech-NRAO Stripe 82 Survey (CNSS). IV. The Birth of Radio-loud Quasar 013815+00
• Discovery of five low luminosity active galactic nuclei at the centre of the Perseus cluster
• A parsec-scale faint jet in the nearby changing-look Seyfert galaxy Mrk 590
• The curious activity in the nucleus of NGC 4151: jet interaction causing variability?
• Changing-look AGNs or short-lived radio sources?
• The radio structure of the peculiar narrow-line Seyfert 1 galaxy candidate J1100+4421
• Probing the nature of compact ultra-steep spectrum radio sources with the e-EVN and e-MERLIN

Cited by in corpus (5)

• BASS XXXIX: Swift-BAT AGN with changing-look optical spectra
• WISE view of changing-look AGNs: evidence for a transitional stage of AGNs
• Long-term and multi-wavelength evolution of a changing-look AGN Mrk 1018
• Transient radio emission from low-redshift galaxies at z<0.3 revealed by VLASS and FIRST surveys
• Update of the INTEGRAL/IBIS AGN catalogue: deeper on the Galactic plane and wider beyond