A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Long-term spectral and temporal behavior of the high-frequency peaked BL LAC object 1ES 1959+650
Tekijät: Backes M, Uellenbeck M, Hayashida M, Satalecka K, Tescaro D, Terzic T, Fuhrmann L, Nestoras I, Lahteenmaki A, Tornikoski M, Nieppola E, Bottcher M, Collmar W, Weidinger M
Julkaisuvuosi: 2012
Lehti: AIP Conference Proceedings
Tietokannassa oleva lehden nimi: HIGH ENERGY GAMMA-RAY ASTRONOMY
Lehden akronyymi: AIP CONF PROC
Vuosikerta: 1505
Aloitussivu: 522
Lopetussivu: 525
Sivujen määrä: 4
ISSN: 0094-243X
DOI: https://doi.org/10.1063/1.4772312
Tiivistelmä
In this context, 1ES 1959+650 has been regularly monitored by the MAGIC telescope since 2005. During these years, no significant variation in the VHE gamma-ray flux has been observed. The low energy part of this is in very good agreement with the high-energy part of the time-integrated energy spectrum as measured by Fermi-LAT. Based on this constant flux level in VHE gamma-rays, we assembled the time-integrated spectral energy distribution (SED) of 1ES 1959+650 from radio to VHE gamma-rays. Despite the non-variability at very high energies, significant flux and spectral variations have been observed at optical and X-ray frequencies in the meanwhile. Furthermore, the shape of the SED at high energy.-rays as measured by Fermi-LAT is essentially flat which cannot be explained by either conventional single-zone SSC models, or models invoking external radiation fields (EC).
In this context, 1ES 1959+650 has been regularly monitored by the MAGIC telescope since 2005. During these years, no significant variation in the VHE gamma-ray flux has been observed. The low energy part of this is in very good agreement with the high-energy part of the time-integrated energy spectrum as measured by Fermi-LAT. Based on this constant flux level in VHE gamma-rays, we assembled the time-integrated spectral energy distribution (SED) of 1ES 1959+650 from radio to VHE gamma-rays. Despite the non-variability at very high energies, significant flux and spectral variations have been observed at optical and X-ray frequencies in the meanwhile. Furthermore, the shape of the SED at high energy.-rays as measured by Fermi-LAT is essentially flat which cannot be explained by either conventional single-zone SSC models, or models invoking external radiation fields (EC).
Turun yliopiston Tutkimustietojärjestelmän portaali