65 citations · 214 across the 12 of their papers we have counts for
12 papers
First detection of VHE gamma-ray signal from the FSRQ TON 0599
MAGIC Collaboration, K. Abe, S. Abe +245
TON\,0599 (z=0.7247) belongs to the few flat spectrum radio quasars (FSRQs) detected in the very high energy (VHE, \,GeV) gamma-ray band. Its redshift makes it currently o…
MAD accretion and AGN jets -- an observational perspective
Tuomas Savolainen, Wara Chamani
One of the major open questions related to the production of jets by accreting black holes is: why do sources with similar accretion powers produce so vastly different jet powers?…
The polarisation behaviour of OJ 287 viewed through radio, millimetre and optical observations between 2015 and 2017
J. Jormanainen, T. Hovatta, E. Lindfors +13
OJ 287 is a bright blazar with century-long observations, and one of the strongest candidates to host a supermassive black hole binary. Its polarisation behaviour between 2015 and…
Interactions between the jet and disk wind in a nearby radio intermediate quasar III Zw 2
Ailing Wang, Tao An, Shaoguang Guo +13
Disk winds and jets are ubiquitous in active galactic nuclei (AGN), and how these two components interact remains an open question. We study the radio properties of a radio-interme…
Time variability of the core-shift effect in the blazar 3C 454.3
Wara Chamani, Tuomas Savolainen, Eduardo Ros +5
Using VLBI to measure a so-called core shift effect is a common way of obtaining estimates of the jet magnetic field strength. The VLBI core is typically identified as the bright f…
Testing the magnetic flux paradigm for AGN radio loudness with a radio intermediate quasar
Wara Chamani, Tuomas Savolainen, Kazuhiro Hada +1
For understanding the diversity of jetted active galactic nuclei (AGN) and especially the puzzling wide range in their radio-loudness, it is important to understand what role the m…
Joint XMM-Newton and NuSTAR observations of the reflection spectrum of III Zw 2
Wara Chamani, Karri Koljonen, Tuomas Savolainen
Detecting and modelling the reprocessed hard X-ray emission component in the accretion flow, so-called reflection spectrum is a main tool to estimate black hole spins in a wide ran…
Long term variability and correlation study of the blazar 3C 454.3 in radio, NIR and optical wavebands
A. Sarkar, V. R. Chitnis, A. C. Gupta +11
We performed a long-term optical (B, V, R bands), infra-red (J and K bands) and radio band (15, 22, 37 GHz band) study on the flat spectrum radio quasar, 3C 454.3, using the data c…
X-ray, UV, and Radio Timing Observations of the Radio Galaxy 3C 120
Alan P. Marscher, Svetlana G. Jorstad, Karen E. Williamson +7
We report the results of monitoring of the radio galaxy 3C 120 with the Neil Gehrels Swift Observatory, Very Long Baseline Array, and Metsähovi Radio Observatory. The UV-optical co…
Radio jets and gamma-ray emission in radio-silent narrow-line Seyfert 1 galaxies
A. Lähteenmäki, E. Järvelä, V. Ramakrishnan +4
We have detected six narrow-line Seyfert 1 (NLS1) galaxies at 37 GHz that were previously classified as radio silent and two that were classified as radio quiet. These detections r…
Multiwavelength observations of the blazar BL Lacertae: a new fast TeV gamma-ray flare
A. U. Abeysekara, W. Benbow, R. Bird +74
Combined with very-long-baseline interferometry measurements, the observations of fast TeV gamma-ray flares probe the structure and emission mechanism of blazar jets. However, only…
Turbulent gas accretion between supermassive black holes and star-forming rings in the circumnuclear disk
Wara Chamani, Stephanie Doerschner, Dominik R. G. Schleicher
While supermassive black holes are known to co-evolve with their host galaxy, the precise nature and origin of this co-evolution is not clear. We here explore the possible connecti…