55 citations · 173 across the 10 of their papers we have counts for
10 papers
Multi-Epoch X-Ray Detection of SLSN-I 2018bsz: Constraints on the Powering Mechanism and Ejecta Structure
Julia Ahlvind, Josefin Larsson, Dennis Alp +1
SN 2018bsz is the closest known stripped superluminous supernova (SLSN-I) to date, making it an ideal laboratory for investigating the physical mechanisms powering this class of ex…
The position of SN 1987A
C. Tegkelidis, J. Larsson, D. Alp
The accurate positional measurement of Supernova (SN) 1987A is important for determining the kick velocity of its compact object and the velocities of the ejecta and various shock…
FBQS J1644+2619: multiwavelength properties and its place in the class of gamma-ray emitting Narrow Line Seyfert 1s
J. Larsson, F. D'Ammando, S. Falocco +4
A small fraction of Narrow Line Seyfert 1s (NLSy1s) are observed to be gamma-ray emitters. Understanding the properties of these sources is of interest since the majority of NLSy1s…
Investigating powerful jets in radio-loud Narrow Line Seyfert 1s
M. Orienti, F. D'Ammando, J. Larsson +5
We report results on multiband observations from radio to gamma-rays of the two radio-loud narrow-line Seyfert 1 (NLSy1) galaxies PKS 2004-447 and J1548+3511. Both sources show a c…
A panchromatic view of relativistic jets in gamma-ray emitting narrow-line Seyfert 1 galaxies
F. D'Ammando, M. Orienti, J. Finke +2
Before the launch of the Fermi satellite only two classes of Active Galactic Nuclei (AGN) were known to generate relativistic jets and thus to emit up to the gamma-ray energy range…
The most powerful flaring activity from the NLSy1 PMN J0948+0022
F. D'Ammando, M. Orienti, J. Finke +73
We report on multifrequency observations performed during 2012 December-2013 August of the first narrow-line Seyfert 1 galaxy detected in gamma rays, PMN J0948+0022 ( = 0.5846).…
Gamma-ray emitting narrow-line Seyfert 1 galaxies. New discoveries and open questions
F. D'Ammando, M. Orienti, J. Finke +2
The discovery of gamma-ray emission from 5 radio-loud narrow-line Seyfert 1 galaxies revealed the presence of a possible emerging third class of AGNs with relativistic jets, in add…
Relativistic jets in narrow-line Seyfert 1 galaxies. New discoveries and open questions
F. D'Ammando, M. Orienti, J. Finke +2
Before the launch of the Fermi satellite only two classes of AGNs were known to produce relativistic jets and thus emit up to the gamma-ray energy range: blazars and radio galaxies…
Suzaku observations of Markarian 335: evidence for a distributed reflector
J. Larsson, G. Miniutti, A. C. Fabian +3
We report on a 151 ks net exposure Suzaku observation of the Narrow Line Seyfert 1 galaxy Mrk 335. The 0.5-40 keV spectrum contains a broad Fe line, a strong soft excess below abou…
Exploring the X-ray spectral variability of MCG-6-30-15 with XMM-Newton
J. Larsson, A. C. Fabian, G. Miniutti +1
We present a study of the spectral variability of the Seyfert I galaxy MCG-6-30-15 based on the two long XMM-Newton observations from 2000 and 2001. The X-ray spectrum and variabil…