TeV BL Lac objects at the dawn of the Fermi era

By F. Tavecchio, G. Ghisellini, G. Ghirlanda, Luigi Foschini, L. Maraschi. 2009

202 citations recorded by the source corpus.

We reconsider the emission properties of BL Lac objects emitting in the high-energy y-ray band, by exploiting the information in the MeV-GeV band obtained by the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope in its first three months of operation. To this aim we construct the spectral energy distribution of all the BL Lacs revealed by LAT and of the known TeV BL Lacs not detected by LAT, also including data from the Swift satellite, and model them with a simple one-zone leptonic model. The analysis shows that the BL Lacs detected by LAT (whether or not already detected in the TeV band) share similar physical parameters. While some of the TeV BL Lacs not revealed by LAT have spectral energy distributions and physical parameters very similar to the LAT BL Lacs, one group of objects displays peculiar properties (larger electron energies and smaller magnetic fields), suggesting different physical conditions in the emission region. Finally, we discuss possible criteria to select in an effective manner good new candidates for the Cherenkov telescopes among the LAT sources, presenting a list of predicted fluxes in the very high-energy band calculated including the effects of absorption by extragalactic background light.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/81dd43ac96ef46e1ea7e503b0b837c2b971e194b

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In Astronomy and Astrophysics

1. F. Tavecchio
2. G. Ghisellini
3. Bing Zhang
4. C. Dermer
5. Luigi Foschini
6. L. Maraschi
7. G. Ghirlanda
8. S. Komossa

In Nuclear and High Energy Physics

1. F. Tavecchio
2. G. Ghisellini
3. C. Dermer
4. Luigi Foschini
5. L. Maraschi
6. J. Finke
7. G. Ghirlanda
8. G. Bonnoli

Citations in the corpus

• A hadronic origin for ultra-high-frequency-peaked BL Lac objects (2014, background): “In standard SSC modelling of HBLs, a spectral break of 1.0 is rarely observed (Tavecchio et al. 2010; Cerruti et al. 2013a), suggesting that acceleration and cooling in the emitting region is more complicated, with additional injection/escape terms.”
• The Blazar TXS 0506+056 Associated with a High-energy Neutrino: Insights into Extragalactic Jets and Cosmic-Ray Acceleration (2018, background): “The obtained SEDs appear typical of BL Lac objects with similar luminosities (Tavecchio et al. 2010).”
• The transition between BL Lac objects and flat spectrum radio quasars (2010, background): “Due to the TeV detection, these 3 sources cannot lie at very large redshift althoughz up to∼0.7 would be possible (see Tavecchio et al. 2010 for PKS 1424+240 modelled assumingz = 0.67).”
• Extreme TeV blazars and the intergalactic magnetic field (2010, background): “…for deriving upper limits on the still unknown inte - c© 0000 RAS sity of the intergalactic magnetic field (IGMF, e.g. Kronberg 2001, Widrow 2002), based on the measured upper limits of the flux inthe GeV band (Neronov & Vovk 2010, Tavecchio et al. 2010b, hereafter T10b, Dolag et al. 2011).”
• Properties of flat-spectrum radio-loud Narrow-Line Seyfert 1 Galaxies (2014, methodology): “These values were calculated from the samples of γ−ray blazars from Ghisellini et al. (2009, 2010) and Tavecchio et al. (2010) and radio-quiet Seyferts from Grupe et al. (2010).”
• TIME DELAY OF CASCADE RADIATION FOR TeV BLAZARS AND THE MEASUREMENT OF THE INTERGALACTIC MAGNETIC FIELD (2010, methodology): “By comparing blazar TeV fluxes with upper limits on the GeV radiation flux measurements with the Fermi Gamma-ray Space Telescope, several claims (see Table 1) have been made that lower limits on the IGMF have been measured (Neronov & Vovk 2010; Tavecchio et al. 2010a, 2011; Dolag et al. 2011).”