TY - UNPB
T1 - Daily variability at milli-arcsecond scales in the radio quiet NLSy1 Mrk 110
AU - Panessa, Francesca
AU - Perez-Torres, Miguel
AU - Hernandez-Garcia, Lorena
AU - Casella, Piergiorgio
AU - Giroletti, Marcello
AU - Orienti, Monica
AU - Baldi, Ranieri D.
AU - Bassani, Loredana
AU - Fiocchi, Maria Teresa
AU - La Franca, Fabio
AU - Malizia, Angela
AU - McHardy, Ian
AU - Nicastro, Fabrizio
AU - Piro, Luigi
AU - Vincentelli, Federico
AU - Williams, David R. A.
AU - Ubertini, Pietro
PY - 2021/11/25
Y1 - 2021/11/25
N2 - 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....
AB - 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....
M3 - Working paper
BT - Daily variability at milli-arcsecond scales in the radio quiet NLSy1 Mrk 110
PB - Oxford University Press
ER -