A new activity phase of the blazar 3C 454.3 Multifrequency observations by the WEBT and XMM-Newton in 2007-2008

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F08%3A00035973" target="_blank" >RIV/00216224:14310/08:00035973 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26110/08:PU85946

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

A new activity phase of the blazar 3C 454.3 Multifrequency observations by the WEBT and XMM-Newton in 2007-2008

Popis výsledku v původním jazyce

In the optical band we observed a multi-peak outburst in July-August 2007, and other faster events in November 2007-February 2008. Colour analysis confirms a general redder-when-brighter trend, which reaches a "saturation" at R ~ 14 and possibly turns into a bluer-when-brighter trend in bright states. This behaviour is due to the interplay of different emission components, the synchrotron one possibly being characterised by an intrinsically variable spectrum. The most obvious interpretation implies that, as the beamed synchrotron radiation from the jet dims, we can see both the head and the tail of the big blue bump. The X-ray flux correlates with the optical flux, suggesting that in the inverse-Compton process either the seed photons are synchrotron photons at IR-optical frequencies or the relativistic electrons are those that produce the optical synchrotron emission. The X-ray radiation would thus be produced in the jet region from where the IR-optical emission comes.

Název v anglickém jazyce

A new activity phase of the blazar 3C 454.3 Multifrequency observations by the WEBT and XMM-Newton in 2007-2008

Popis výsledku anglicky

In the optical band we observed a multi-peak outburst in July-August 2007, and other faster events in November 2007-February 2008. Colour analysis confirms a general redder-when-brighter trend, which reaches a "saturation" at R ~ 14 and possibly turns into a bluer-when-brighter trend in bright states. This behaviour is due to the interplay of different emission components, the synchrotron one possibly being characterised by an intrinsically variable spectrum. The most obvious interpretation implies that, as the beamed synchrotron radiation from the jet dims, we can see both the head and the tail of the big blue bump. The X-ray flux correlates with the optical flux, suggesting that in the inverse-Compton process either the seed photons are synchrotron photons at IR-optical frequencies or the relativistic electrons are those that produce the optical synchrotron emission. The X-ray radiation would thus be produced in the jet region from where the IR-optical emission comes.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

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Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2008

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy and Astrophysics

ISSN

0004-6361

e-ISSN

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Svazek periodika

491

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

11

Strana od-do

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Kód UT WoS článku

000261152900013

EID výsledku v databázi Scopus

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