A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Empirical multi-wavelength prediction method for very high energy gamma-ray emitting BL Lacertae objects
Tekijät: Ramazani VF, Lindfors E, Nilsson K
Kustantaja: EDP SCIENCES S A
Julkaisuvuosi: 2017
Journal: Astronomy and Astrophysics
Tietokannassa oleva lehden nimi: ASTRONOMY & ASTROPHYSICS
Lehden akronyymi: ASTRON ASTROPHYS
Artikkelin numero: ARTN A68
Vuosikerta: 608
Sivujen määrä: 10
ISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/201730505
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/28147585
Aim: We have collected the most complete multi-wavelength (6.0-6.0 x 10(18) cm) dataset of very high energy (VHE) gamma-ray emitting (TeV) BL Lacs, which are the most numerous extragalactic VHE sources. Using significant correlations between different bands, we aim to identify the best TeV BL Lac candidates that can be discovered by the current and next generation of imaging air Cherenkov telescopes.Methods: We formed five datasets from lower energy data, i.e. radio, mid-infrared, optical, X-rays, and GeV gamma-ray, and five VHE gamma-ray datasets to perform a correlation study between di ff erent bands and to construct the prediction method. The low energy datasets were averaged for individual sources, while the VHE gamma-ray data were divided into subsets according to the flux state of the source. We then looked for significant correlations and determined their best-fit parameters. Using the best-fit parameters we predicted the level of VHE gamma-ray flux for a sample of 182 BL Lacs, which have not been detected at TeV energies. We identified the most promising TeV BL Lac candidates based on the predicted VHE gamma-ray flux for each source.Results: We found 14 significant correlations between radio, mid-infrared, optical, gamma-ray, and VHE gamma-ray bands. The correlation between optical and VHE gamma-ray luminosity is established for the first time. We attribute this to the more complete sample and more accurate handling of host galaxy flux in our work. We found nine BL Lac candidates whose predicted VHE gamma-ray flux is high enough for detection in less than 25 h with current imaging air Cherenkov telescopes.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
