333 citations · 4.2k across the 122 of their papers we have counts for
19 papers · 1 filter
Multi-Epoch Modeling of TXS 0506+056 and Implications for Long-Term High-Energy Neutrino Emission
Maria Petropoulou, Kohta Murase, Marcos Santander +11
The IceCube report of a excess of neutrino events in the direction of the blazar TXS 05056+056 in 2014-2015 and the 2017 detection of a high-energy neutrino, I…
Inverse Compton Signatures of Gamma-Ray Burst Afterglows
Hao Zhang, Ian Christie, Maria Petropoulou +2
The afterglow emission from gamma-ray bursts (GRBs) is believed to originate from a relativistic blast wave driven into the circumburst medium. Although the afterglow emission from…
A Neutral Beam Model for High-Energy Neutrino Emission from the Blazar TXS 0506+056
B. Theodore Zhang, Maria Petropoulou, Kohta Murase +1
The IceCube collaboration reported a excess of neutrino events in the direction of the blazar TXS 0506+56 during a 6 month period in 2014-2015, as well a…
A two-zone model for blazar emission: implications for TXS 0506+056 and the neutrino event IceCube-170922A
Rui Xue, Ruo-Yu Liu, Maria Petropoulou +4
A high-energy muon neutrino event, IceCube-170922A, was recently discovered in both spatial and temporal coincidence with a gamma-ray flare of the blazar TXS 0506+056. It has been…
Inverse Compton Cascades in Pair-Producing Gaps: Effects of Triplet Pair Production
Maria Petropoulou, Yajie Yuan, Alexander Y. Chen +1
Inverse Compton-pair cascades are initiated when gamma-rays are absorbed on an ambient soft photon field to produce relativistic pairs, which in turn up-scatter the same soft photo…
Inter-Plasmoid Compton Scattering and the Compton Dominance of BL Lacs
I. M. Christie, M. Petropoulou, L. Sironi +1
Blazar emission models based on magnetic reconnection succeed in reproducing many observed spectral and temporal features, including the short-duration luminous flaring events. Pla…
All-sky Medium Energy Gamma-ray Observatory: Exploring the Extreme Multimessenger Universe
Julie McEnery, Juan Abel Barrio, Ivan Agudo +182
The All-sky Medium Energy Gamma-ray Observatory (AMEGO) is a probe class mission concept that will provide essential contributions to multimessenger astrophysics in the late 2020s…
Relativistic Magnetic Reconnection in Electron-Positron-Proton Plasmas: Implications for Jets of Active Galactic Nuclei
Maria Petropoulou, Lorenzo Sironi, Anatoly Spitkovsky +1
Magnetic reconnection is often invoked to explain the non-thermal radiation of relativistic outflows, including jets of active galactic nuclei (AGN). Motivated by the largely unkno…
NGC 300 ULX1: spin evolution, super-Eddington accretion and outflows
G. Vasilopoulos, M. Petropoulou, F. Koliopanos +4
NGC300 ULX1 is an ultra-luminous X-ray pulsar, showing an unprecedented spin evolution, from about 126 s to less than 20 s in only 4 years, consistent with steady mass accretion ra…
Supermassive black holes at high redshifts
Vaidehi S. Paliya, Marco Ajello, Lea Marcotulli +31
MeV blazars are the most luminous persistent sources in the Universe and emit most of their energy in the MeV band. These objects display very large jet powers and accretion lumino…
Neutrinos, Cosmic Rays and the MeV Band
R. Ojha, H. Zhang, M. Kadler +23
The possible association of the blazar TXS 0506+056 with a high-energy neutrino detected by IceCube holds the tantalizing potential to answer three astrophysical questions: 1. Wher…
Energetic Particles of Cosmic Accelerators II: Active Galactic Nuclei and Gamma-ray Bursts
Tonia M. Venters, Sylvain Guiriec, Amy Y. Lien +26
The high-energy universe has revealed that energetic particles are ubiquitous in the cosmos and play a vital role in the cultivation of cosmic environments on all scales. Though th…
High-Energy Polarimetry - a new window to probe extreme physics in AGN jets
B. Rani, H. Zhang, S. D. Hunter +31
The constantly improving sensitivity of ground-based and space-borne observatories has made possible the detection of high-energy emission (X-rays and gamma-rays) from several thou…
Multi-Physics of AGN Jets in the Multi-Messenger Era
B. Rani, M. Petropoulou, H. Zhang +20
Active galactic nuclei (AGN) with relativistic jets, powered by gas accretion onto their central supermassive black hole (SMBH), are unique laboratories for studying the physics of…
A Unique Messenger to Probe Active Galactic Nuclei: High-Energy Neutrinos
Sara Buson, Ke Fang, Azadeh Keivani +6
This Astro2020 white paper advocates for a multi-messenger approach that combines high-energy neutrino and broad multi-wavelength electromagnetic observations to study AGN during t…
High-Energy Neutrinos from Blazar Flares and Implications of TXS 0506+056
Foteini Oikonomou, Kohta Murase, Maria Petropoulou
Motivated by the observation of a TeV muon neutrino by IceCube, coincident with a 6 month-long -ray flare of the blazar TXS 0506+056, and an archival search which r…
Extreme Plasma Astrophysics
D. Uzdensky, M. Begelman, A. Beloborodov +22
This is a science white paper submitted to the Astro-2020 and Plasma-2020 Decadal Surveys. The paper describes the present status and emerging opportunities in Extreme Plasma Astro…
On the connection of radio and -ray emission in blazars
Stella Boula, Maria Petropoulou, Apostolos Mastichiadis
Blazars are a sub-category of radio-loud active galactic nuclei with relativistic jets pointing towards to the observer. They are well-known for their non-thermal variable emission…
TXS 0506+056, the first cosmic neutrino source, is not a BL Lac
P. Padovani, F. Oikonomou, M. Petropoulou +2
We present evidence that TXS 0506+056, the first plausible non-stellar neutrino source, despite appearances, is not a blazar of the BL Lac type but is instead a masquerading BL Lac…