Astrophysical Neutrinos and Blazars

Giommi, P.; Padovani, P.

doi:10.48550/arxiv.2112.06232

Cited by 2 publications

(10 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this period the source was in an active flaring state (Acciari et al 2021) also in the Swift-XRT band (see Fig. 11 of Giommi et al 2021). Together with the flux, the photon index also varies following a harder-when-brighter trend.…”

Section: Mkn 421mentioning

confidence: 90%

“…The broad-band (radio to 𝛾-ray) SED of all the sources in our sample have been assembled by combining the best fit spectral data derived in the previous sections with archival multi-frequency data, retrieved with the VOU-Blazars tool (Chang et al 2019b) and the SSDC SED Builder tool 3 , as well as with the results of the Swift-XRT analysis of Giommi et al (2021). The Swift-XRT SED data of the sources not included in Giommi et al (2021) have been generated by us for this paper following the same procedure described in Giommi et al (2021). In the following we plot and describe the SED of a small number of selected objects, where the archival data appears as orange points, the Swift-XRT data as light green points, and the NuSTAR_Spectra data as magenta circles.…”

Section: Spectral Energy Distributions and Comments On Selected Objectsmentioning

confidence: 99%

“…We have compiled NuBlazar, the first catalogue of hard X-ray spectra and spectral fit results through a standard processing of all the observations of the blazars included in the NuSTAR public archive as of September 2021. This database, which is analogous to the one presented by Giommi et al (2021) for the sample of blazars frequently observed by Swift-XRT, includes 253 observations of 126 individual sources. The spectral data, along with other multi-frequency archival data sets, such as those that can be retrieved via e.g.…”

Section: Final Commentsmentioning

confidence: 99%

“…They radiate from radio wavelengths to the 𝛾-ray domain (e.g. Urry & Padovani 1995), and, possibly, they also emit high-energy neutrinos (IceCube Collaboration et al 2018a;Giommi et al 2020b;Giommi & Padovani 2021). These sources are radio bright, show ★ E-mail: riccardo.middei@ssdc.asi.it prominent flux variability and sometimes large polarisation signals and they can be classified via physical and geometrical conditions as discussed by Giommi et al (2012).…”

Section: Introductionmentioning

confidence: 99%

“…In an effort to facilitate sample studies we performed a systematic analysis of all the blazars included in the public NuSTAR archive, reporting their spectral properties in the first NuSTAR blazars catalogue (NuBlazar). Such a catalogue is based on the NuSTAR_Spectra script, a software tool similar to Swift_xrtproc (Giommi et al 2021), both developed in the context of the Open Universe (OU) initiative (Giommi et al 2020a) in collaboration with Space Science Data Center (SSDC) of the Italian Space Agency (ASI).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The first hard X-ray spectral catalogue of Blazars observed by NuSTAR

Middei,

Giommi,

Perri

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Blazars are a peculiar class of active galactic nuclei (AGNs) that enlighten the sky at all wavelengths. The electromagnetic emission of these sources is jet-dominated resulting in a spectral energy distribution (SED) that has a typical double-humped shape. X-ray photons provide a wealth of information on the physics of each source as in the X-ray band we can observe the tail of SED first peak, the rise of the second one or the transition between the two. NuSTAR, thanks to its capability of focusing X-rays up to 79 keV provides broadband data particularly suitable to compute SEDs in a still poorly explored part of the spectrum. In the context of the Open Universe initiative we developed a dedicated pipeline, NuSTAR_Spectra, a shell-script that automatically downloads data from the archive, generates scientific products and carries out a complete spectral analysis. The script homogeneously extracts high level scientific products for both NuSTAR's telescopes and the spectral characterisation is performed testing two phenomenological models. The corresponding X-ray properties are derived from the data best-fit and the SEDs are also computed. The systematic processing of all blazar observations of the NuSTAR public archive allowed us to release the first hard X-ray spectroscopic catalogue of blazars (NuBlazar). The catalogue, updated to September 30th, 2021, includes 253 observations of 126 distinct blazars, 30 of which have been multiply observed.

show abstract

Section: Mkn 421mentioning

confidence: 90%