The TeV emission of Ap Librae: a hadronic interpretation and prospects for CTA

Πετροπούλου, Μαρία; Vasilopoulos, Georgios; Giannios, Dimitrios

doi:10.1093/mnras/stw2453

Cited by 33 publications

(25 citation statements)

References 81 publications

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“…Unlike the models of [3,4], we do not expect variability in the extended jet emission, because such a large object must be steady over time scales much longer than a few times l jet /c. Thus, the flux above a few GeV should not drop below the observed level.…”

Section: Discussionmentioning

confidence: 83%

“…Since LBLs exhibit their synchrotron peak frequency below 10 14 Hz and the X-rays stem from the inverse Compton (IC) process, the maximum electron Lorentz factor in the electron energy distribution does not significantly exceed ∼10 4 for reasonable values of the magnetic field strength on the order of ∼0.1 G. Hence, one would not expect very high energy γ-ray (VHE, E > 100 GeV) emission from these objects. Surprisingly, AP Librae has been clearly detected by observations with the H.E.S.S.…”

Section: Introductionmentioning

confidence: 99%

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AP Librae: The Extended Jet as the Source of VHE Emission?

Zacharias

Wagner

2016

Galaxies

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Abstract:The LBL AP Librae has been detected in the TeV gamma-ray range, which is unexpected for this kind of blazar. The broad-band SED cannot be explained by a one-zone model, and especially fails in the TeV domain. An extended jet has been detected on arcsec scales both in radio and X-ray frequencies. The spectral index of the X-ray band indicates an inverse Compton origin. Using an IC/CMB model, the TeV emission can be successfully modeled as originating in the extended jet. Several arguments in favor of this model, as well as observational tests, will be presented. The observations suggest that acceleration of particles to very high energies is still efficient at large distances from the core.

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Section: Discussionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

AP Librae: The Extended Jet as the Source of VHE Emission?

Zacharias

Wagner

2016

Galaxies

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“…Such emissions are related to the acceleration of leptonic and/or hadronic particles within the source. The observed photon spectra is often modeled by synchrotron radiation of leptons; hadrons are less frequently invoked, although they also lead to consistent pictures in specific cases, for example, for some blazars where leptons alone fail to provide a satisfactory explanation to the data (e.g., Oikonomou et al 2014;Petropoulou et al 2016bPetropoulou et al , 2017c. A&A 603, A76 (2017) In the latter situation, the detection of neutrinos would be an unquestionable indicator of the acceleration of hadrons and of their interaction within the source environment.…”

Section: Introductionmentioning

confidence: 99%

Can we observe neutrino flares in coincidence with explosive transients?

Guépin

Kotera

2017

A&A

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The new generation of powerful instruments is reaching sensitivities and temporal resolutions that will allow multi-messenger astronomy of explosive transient phenomena, with high-energy neutrinos as a central figure. We derive general criteria for the detectability of neutrinos from powerful transient sources for given instrument sensitivities. In practice, we provide the minimum photon flux necessary for neutrino detection based on two main observables: the bolometric luminosity and the time variability of the emission. This limit can be compared to the observations in specified wavelengths in order to target the most promising sources for follow-ups. Our criteria can also help distinguishing false associations of neutrino events with a flaring source. We find that relativistic transient sources such as high-and low-luminosity gamma-ray bursts (GRBs), blazar flares, tidal disruption events, and magnetar flares could be observed with IceCube, as they have a good chance to occur within a detectable distance. Of the nonrelativistic transient sources, only luminous supernovae appear as promising candidates. We caution that our criterion should not be directly applied to low-luminosity GRBs and type Ibc supernovae, as these objects could have hosted a choked GRB, leading to neutrino emission without a relevant counterpart radiation. We treat a set of concrete examples and show that several transients, some of which are being monitored by IceCube, are far from meeting the criterion for detectability (e.g., Crab flares or Swift J1644+57).

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“…As pointed out in Section 1, SBS B1646+499 should be considered as a hybrid blazar, with intermediate properties between FSRQs and BL Lacs. Its broad-band SED, with the relatively narrow synchrotron hump when compared to the high-energy emission component ex-tending from X-rays up to tens of GeV photon energies, seems to resemble closely the broad-band SED of AP Librae, which challenges the standard (one-zone synchrotron self-Compton) blazar emission modeling (see Kaufmann et al 2013;Hervet et al 2015;Sanchez et al 2015;Zacharias & Wagner 2016;Petropoulou et al 2017;Pratim Basumallick & Gupta 2017). As such, SBS B1646+499 could be potentially a compelling target for the observations at TeV photon energies with groundbased Cherenkov telescopes.…”

Section: Discussionmentioning

confidence: 94%

Megaparsec-scale Radio Structure Associated with a Hybrid Blazar SBS B1646+499: Episodic Jet Activity with Precessing Axis

Pajdosz-Śmierciak

Jamrozy

Soida

et al. 2018

ApJ

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Here we report on the total-intensity 610 MHz GMRT observations of the peculiar hybrid blazar SBS B1646+499, which merges the properties of BL Lacertae objects and flat-spectrum radio quasars. The complex radio structure of SBS B1646+499, emerging from the archival radio data and our new GMRT observations, consists of the Mpc-scale, elongated halo, the unilateral kpc-scale jet, and the nuclear jet extending up to ∼ 20 pc from the compact core. The giant halo is characterized by a steep radio spectrum, indicative of the advanced ageing of the electron population within the lobes. For the large-scale jet, we detected a spectral gradient along and across the outflow, and in particular spectral flattening of the radio continuum toward the jet edges, suggestive of the spine-boundary shear layer morphology. The nuclear jet displays superluminal knots emerging from the self-absorbed and variable radio core. We interpret all these findings in the framework of the model of an episodic jet activity with a precessing jet axis.

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The TeV emission of Ap Librae: a hadronic interpretation and prospects for CTA

Cited by 33 publications

References 81 publications

AP Librae: The Extended Jet as the Source of VHE Emission?

AP Librae: The Extended Jet as the Source of VHE Emission?

Can we observe neutrino flares in coincidence with explosive transients?

Megaparsec-scale Radio Structure Associated with a Hybrid Blazar SBS B1646+499: Episodic Jet Activity with Precessing Axis

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