333 citations · 4.2k across the 122 of their papers we have counts for
9 papers · 1 filter
A hadronic minute-scale GeV flare from quasar 3C 279?
M. Petropoulou, K. Nalewajko, M. Hayashida +1
The flat spectrum radio quasar 3C 279 is a known -ray variable source that has recently exhibited minute-scale variability at energies MeV. One-zone leptonic models for b…
The TeV emission of Ap Librae: a hadronic interpretation and prospects for CTA
Maria Petropoulou, Georgios Vasilopoulos, Dimitrios Giannios
Ap Librae is one out of a handful of low-frequency peaked blazars to be detected at TeV -rays and the only one with an identified X-ray jet. Combined observations of Fermi-LAT a…
Early-time signatures of γ-ray emission from supernovae in dense circumstellar media
Dimitrios Kantzas, Maria Petropoulou, Apostolos Mastichiadis
We present our results on the γ-ray emission from interaction-powered supernovae (SNe), a recently discovered SN type that is suggested to be surrounded by a circumstellar medium (…
Blazar flares powered by plasmoids in relativistic reconnection
Maria Petropoulou, Dimitrios Giannios, Lorenzo Sironi
Powerful flares from blazars with short ( min) variability timescales are challenging for current models of blazar emission. Here, we present a physically motivated ab initio…
Plasmoids in relativistic reconnection, from birth to adulthood: first they grow, then they go
L. Sironi, D. Giannios, M. Petropoulou
Blobs, or quasi-spherical emission regions containing relativistic particles and magnetic fields, are often assumed ad hoc in emission models of relativistic astrophysical jets, ye…
Time-dependent neutrino emission from Mrk 421 during flares and predictions for IceCube
Maria Petropoulou, Stefan Coenders, Stavros Dimitrakoudis
Blazars are prime candidate sources for the high energy neutrinos recently detected by IceCube. Being one of the brightest sources in the extragalactic X-ray and -ray sky as wel…
Radio synchrotron emission from secondary electrons in interaction-powered supernovae
Maria Petropoulou, Atish Kamble, Lorenzo Sironi
Several supernovae (SNe) with an unusually dense circumstellar medium (CSM) have been recently observed at radio frequencies. Their radio emission is powered by relativistic electr…
The many faces of blazar emission in the context of hadronic models
Maria Petropoulou, Stavros Dimitrakoudis, Paolo Padovani +3
We present two ways of modeling the spectral energy distribution of blazars in the hadronic context and discuss the predictions of each "hadronic variant" on the spectral shape, th…
Modelling Accretion Disk and Stellar Wind Interactions: the Case of Sgr A*
I. M. Christie, M. Petropoulou, P. Mimica +1
Sgr A* is an ideal target to study low-luminosity accreting systems. It has been recently proposed that properties of the accretion flow around Sgr A* can be probed through its int…