A Numerical Model of Parsec-Scale SSC Morphologies and Their Radio Emission

Richter, Stephan R.; Spanier, F.

doi:10.3847/0004-637x/829/1/56

Cited by 10 publications

(14 citation statements)

References 30 publications

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“…The fully time-dependent implementation is based on the geometry of Weidinger & Spanier (2010). The acceleration mechanism and the implementation of all leptonic processes are adopted from Richter & Spanier (2016), and the photohadronic framework is implemented following Hümmer et al (2010). The acceleration of particles is closely modelled to the Fermi-I acceleration.…”

Section: S E D M O D E L L I N Gmentioning

confidence: 99%

Monitoring of the radio galaxy M 87 during a low-emission state from 2012 to 2015 with MAGIC

Acciari¹,

Ansoldi²,

Antonelli³

et al. 2020

Monthly Notices of the Royal Astronomical Society

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M 87 is one of the closest (z = 0.004 36) extragalactic sources emitting at very high energies (VHE, E > 100 GeV). The aim of this work is to locate the region of the VHE gamma-ray emission and to describe the observed broad-band spectral energy distribution (SED) during the low VHE gamma-ray state. The data from M 87 collected between 2012 and 2015 as part of a MAGIC monitoring programme are analysed and combined with multiwavelength data from Fermi-LAT, Chandra, HST, EVN, VLBA, and the Liverpool Telescope. The averaged VHE gamma-ray spectrum can be fitted from ∼100 GeV to ∼10 TeV with a simple power law with a photon index of (−2.41 ± 0.07), while the integral flux above 300 GeV is $(1.44\pm 0.13)\times 10^{-12}\, \mathrm{cm}^{-2}\, \mathrm{s}^{-1}$. During the campaign between 2012 and 2015, M 87 is generally found in a low-emission state at all observed wavelengths. The VHE gamma-ray flux from the present 2012–2015M 87 campaign is consistent with a constant flux with some hint of variability ($\sim 3\, \sigma$) on a daily time-scale in 2013. The low-state gamma-ray emission likely originates from the same region as the flare-state emission. Given the broad-band SED, both a leptonic synchrotron self-Compton and a hybrid photohadronic model reproduce the available data well, even if the latter is preferred. We note, however, that the energy stored in the magnetic field in the leptonic scenario is very low, suggesting a matter-dominated emission region.

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Section: S E D M O D E L L I N Gmentioning

confidence: 99%

Monitoring of the radio galaxy M 87 during a low-emission state from 2012 to 2015 with MAGIC

Acciari¹,

Ansoldi²,

Antonelli³

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…Furthermore, this scenario predicts time lags between high-frequency and low-frequency light curves and a specific evolution of the radio spectrum with time. Building upon these previous studies, [21] proposed a model of a ballistic jet with uniform structure in order to investigate the relationship between low and high energy emission [see also [31][32][33]. In this model, a relativistic electron population is evolved dynamically along the jet, while taking into account the synchrotron and inverse-Compton losses.…”

Section: Introductionmentioning

confidence: 99%

On the Connection of Radio and γ-Ray Emission in Blazars

2018

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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, which practically extends over the whole electromagnetic spectrum. Despite the plethora of multi-wavelength observations, the issue about the origin of the γ-ray and radio emission in blazar jets remains unsettled. Here, we construct a parametric leptonic model for studying the connection between the γ-ray and radio emission in both steady-state and flaring states of blazars. Assuming that relativistic electrons are injected continuously at a fixed distance from the black hole, we numerically study the evolution of their population as it propagates to larger distances while losing energy due to expansion and radiative cooling. In this framework, γ-ray photons are naturally produced at small distances (e.g. 10 −3 pc) when the electrons are still very energetic, whereas the radio emission is produced at larger distances (e.g. 1 pc), after the electrons have cooled and the emitting region has become optically thin to synchrotron self-absorption due to expansion. We present preliminary results of our numerical investigation for the steady-state jet emission and the predicted time lags between γ-rays and radio during flares.

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“…Such schemes are typically numerically inexpensive, but they are appropriate only for very simple (typically homogeneous, one-zone) geometries. There are, however, a few attempts to apply such schemes also to inhomogeneous multi-zone models, in particular shock-in-jet [94,95] and extended-jet [150,151,158] models. An alternative method to solve the radiation transfer problem is through Monte-Carlo simulations [e.g., [54][55][56]193,194].…”

Section: Numerical Approachesmentioning

confidence: 99%

Progress in Multi-Wavelength and Multi-Messenger Observations of Blazars and Theoretical Challenges

2019

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This review provides an overview of recent advances in multi-wavelength and multi-messenger observations of blazars, the current status of theoretical models for blazar emission, and prospects for future facilities. The discussion of observational results will focus on advances made possible through the Fermi Gamma-Ray Space Telescope and ground-based gamma-ray observatories (H.E.S.S., MAGIC, VERITAS), as well as the recent first evidence for a blazar being a source of IceCube neutrinos. The main focus of this review will be the discussion of our current theoretical understanding of blazar multi-wavelength and multi-messenger emission, in the spectral, time, and polarization domains. Future progress will be expected in particular through the development of the first X-ray polarimeter, IXPE, and the installation of the Cherenkov Telescope Array (CTA), both expected to become operational in the early to mid 2020s.

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A Numerical Model of Parsec-Scale SSC Morphologies and Their Radio Emission

Cited by 10 publications

References 30 publications

Monitoring of the radio galaxy M 87 during a low-emission state from 2012 to 2015 with MAGIC

Monitoring of the radio galaxy M 87 during a low-emission state from 2012 to 2015 with MAGIC

On the Connection of Radio and γ-Ray Emission in Blazars

Progress in Multi-Wavelength and Multi-Messenger Observations of Blazars and Theoretical Challenges

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