Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/30209
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Madejski, G. M. | en_US |
dc.contributor.author | Nalewajko, K. | en_US |
dc.contributor.author | Madsen, K. K. | en_US |
dc.contributor.author | Chiang, J. | en_US |
dc.contributor.author | Baloković, M. | en_US |
dc.contributor.author | Paneque, D. | en_US |
dc.contributor.author | Furniss, A. K. | en_US |
dc.contributor.author | Hayashida, M. | en_US |
dc.contributor.author | Urry, C. M. | en_US |
dc.contributor.author | Sikora, M. | en_US |
dc.contributor.author | Ajello, M. | en_US |
dc.contributor.author | Blandford, R. D. | en_US |
dc.contributor.author | Harrison, F. A. | en_US |
dc.contributor.author | Sanchez, D. | en_US |
dc.contributor.author | Giebels, B. | en_US |
dc.contributor.author | Stern, D. | en_US |
dc.contributor.author | Alexander, D. M. | en_US |
dc.contributor.author | Barret, D. | en_US |
dc.contributor.author | Boggs, S. E. | en_US |
dc.contributor.author | Christensen, F. E. | en_US |
dc.contributor.author | Craig, W. W. | en_US |
dc.contributor.author | Forster, K. | en_US |
dc.contributor.author | Giommi, P. | en_US |
dc.contributor.author | Grefenstette, B. | en_US |
dc.contributor.author | Hailey, C. | en_US |
dc.contributor.author | Hornstrup, A. | en_US |
dc.contributor.author | Kitaguchi, T. | en_US |
dc.contributor.author | Koglin, J. E. | en_US |
dc.contributor.author | Mao, P. H. | en_US |
dc.contributor.author | Miyasaka, H. | en_US |
dc.contributor.author | Mori, K. | en_US |
dc.contributor.author | PERRI, Matteo | en_US |
dc.contributor.author | Pivovaroff, M. J. | en_US |
dc.contributor.author | Puccetti, S. | en_US |
dc.contributor.author | Rana, V. | en_US |
dc.contributor.author | Westergaard, N. J. | en_US |
dc.contributor.author | Zhang, W. W. | en_US |
dc.contributor.author | Zoglauer, A. | en_US |
dc.date.accessioned | 2021-02-03T12:06:26Z | - |
dc.date.available | 2021-02-03T12:06:26Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/30209 | - |
dc.description.abstract | We report the first hard X-ray observations with NuSTAR of the BL Lac-type blazar PKS 2155-304, augmented with soft X-ray data from XMM-Newton and γ-ray data from the Fermi Large Area Telescope, obtained in 2013 April when the source was in a very low flux state. A joint NuSTAR and XMM spectrum, covering the energy range 0.5-60 keV, is best described by a model consisting of a log-parabola component with curvature β = 0.3(-0.1,+0.2) and a (local) photon index 3.04 ± 0.15 at photon energy of 2 keV, and a hard power-law tail with photon index 2.2 ± 0.4. The hard X-ray tail can be smoothly joined to the quasi-simultaneous γ-ray spectrum by a synchrotron self-Compton component produced by an electron distribution with index p = 2.2. Assuming that the power-law electron distribution extends down to γ_min = 1 and that there is one proton per electron, an unrealistically high total jet power of L_p ∼ 10^47 erg s^-1 is inferred. This can be reduced by two orders of magnitude either by considering a significant presence of electron-positron pairs with lepton-to-proton ratio n_e+_e-/n_p ∼ 30, or by introducing an additional, low-energy break in the electron energy distribution at the electron Lorentz factor γ_br1 ∼ 100. In either case, the jet composition is expected to be strongly matter-dominated. | en_US |
dc.language.iso | eng | en_US |
dc.title | First NuSTAR Observations of the BL Lac-type Blazar PKS 2155-304: Constraints on the Jet Content and Distribution of Radiating Particles | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/0004-637X/831/2/142 | en_US |
dc.identifier.scopus | 2-s2.0-84994486633 | en_US |
dc.identifier.isi | 000400474300006 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/831/2/142 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 831 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 142 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016ApJ...831..142M | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_10 High energy and particle astronomy – X-rays, cosmic rays, gamma rays, neutrinos | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.orcid | 0000-0003-3613-4409 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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Madejski_2016_ApJ_831_142.pdf | Pdf editoriale | 516.76 kB | Adobe PDF | View/Open |
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