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 Bibliografske baze podataka

Pregled bibliografske jedinice broj: 751761

Časopis

Autori: Aleksić, Jelena; ...; Babić, Ana; ...; Dominis Prester, Dijana; ...; Ferenc, Daniel; ...; Godinović, Nikola; ...; Hrupec, Dario; ...; Lelas, Damir; ...; Puljak, Ivica; ...; Surić, Tihomir; ...; Šnidarić, Iva; ...; Terzić, Tomislav; ...
Naslov: The 2009 multiwavelength campaign on Mrk 421: Variability and correlation studies
Izvornik: Astronomy and astrophysics (0004-6361) 576 (2015); A126-1-A126-18
Vrsta rada: članak
Ključne riječi: Galaxies: BL Lacertae objects: individual: Markarian 421
Sažetak:
We performed a 4.5-month multi-instrument campaign (from radio to VHE gamma rays) on Mrk421 between January 2009 and June 2009, which included VLBA, F-GAMMA, GASP-WEBT, Swift, RXTE, Fermi-LAT, MAGIC, and Whipple, among other instruments and collaborations. Mrk421 was found in its typical (non-flaring) activity state, with a VHE flux of about half that of the Crab Nebula, yet the light curves show significant variability at all wavelengths, the highest variability being in the X-rays. We determined the power spectral densities (PSD) at most wavelengths and found that all PSDs can be described by power-laws without a break, and with indices consistent with pink/red-noise behavior. We observed a harder-when-brighter behavior in the X-ray spectra and measured a positive correlation between VHE and X-ray fluxes with zero time lag. Such characteristics have been reported many times during flaring activity, but here they are reported for the first time in the non-flaring state. We also observed an overall anti-correlation between optical/UV and X-rays extending over the duration of the campaign. The harder-when-brighter behavior in the X-ray spectra and the measured positive X-ray/VHE correlation during the 2009 multi-wavelength campaign suggests that the physical processes dominating the emission during non-flaring states have similarities with those occurring during flaring activity. In particular, this observation supports leptonic scenarios as being responsible for the emission of Mrk421 during non-flaring activity. Such a temporally extended X-ray/VHE correlation is not driven by any single flaring event, and hence is difficult to explain within the standard hadronic scenarios. The highest variability is observed in the X-ray band, which, within the one-zone synchrotron self-Compton scenario, indicates that the electron energy distribution is most variable at the highest energies.
Projekt / tema: HRZZ-09/176
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Kategorija: Znanstveni
Znanstvena područja:
Fizika
Puni text rada: 751761.2009mwlMrk421.pdf
URL Internet adrese: http://dx.doi.org/10.1051/0004-6361/201424216
http://arxiv.org/abs/1502.02650v2
http://www.aanda.org/articles/aa/abs/2015/04/aa24216-14/aa24216-14.html
Broj citata:
Altmetric:
DOI: 10.1051/0004-6361/201424216
URL cjelovitog teksta: http://dx.doi.org/10.1051/0004-6361/201424216
Google Scholar: The 2009 multiwavelength campaign on Mrk 421: Variability and correlation studies
Upisao u CROSBI: Dario Hrupec (Dario.Hrupec@irb.hr), 15. Vel. 2015. u 21:06 sati



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