Daily variability at milli-arcsecond scales in the radio quiet NLSy1 Mrk 110
Date Issued
2021
Author(s)
•
Miguel Perez-Torres
•
Lorena Hernandez-Garcia
•
Piergiorgio Casella
•
•
•
Ranieri D. Baldi
•
Loredana Bassani
•
•
Fabio La Franca
•
•
Ian McHardy
•
•
•
Federico Vincentelli
•
David R. A. Williams
•
Pietro Ubertini
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.
Issn Identifier
0035-8711
Rights
open.access
File(s)![Thumbnail Image]()
Loading...
Name
2111.12595.pdf
Description
postprint
Size
493.14 KB
Format
Adobe PDF
Checksum (MD5)
72387e20fd81b1b5122230fff96dfc67