Discovery of Gamma‐Ray Emission above 350 GeV from the BL Lacertae Object 1ES 2344+514

Catanese, M.; Akerlof, C.; Badran, H. M.; Biller, S. D.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Burdett, A. M.; Gordo, J. Bussóns; Carter‐Lewis, D. A.; Cawley, M. F.; Connaughton, V.; Fegan, D. J.; Finley, J. P.; Gaidos, J. A.; Hall, T. A.; Hillas, A. M.; Krennrich, F.; Lamb, R. C.; Lessard, R. W.; Masterson, C.; McEnery, J. E.; Mohanty, G.; Quinn, J.; Rodgers, A. J.; Rose, H. J.; Samuelson, F. W.; Schubnell, M.; Sembroski, G. H.; Srinivasan, R.; Weekes, T. C.; Wilson, C.; Zweerink, J.

doi:10.1086/305857

Cited by 169 publications

(120 citation statements)

References 36 publications

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“…Consequently, some of these objects were intensively monitored with imaging atmospheric Cherenkov telescopes (IACT) over the last several years. Possible detections of TeV signals have been claimed by different groups for 1ES 2344+514 (Catanese et al 1998), : Feb. 23, Mar. 15, 16, 18-22, Apr.…”

Section: Introductionmentioning

confidence: 96%

TeV gamma rays from the blazar H 1426+428 and the diffuse extragalactic background radiation

Aharonian

Akhperjanian

Barrio

et al. 2002

A&A

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Abstract. The detection of TeV γ-rays from the blazar H 1426+428 at an integral flux level of (4 ± 2stat ± 1syst) × 10 −12 erg cm −2 s −1 above 1 TeV with the HEGRA imaging atmospheric Cherenkov telescope system is reported. H 1426+428 is located at a redshift of z = 0.129, which makes it the most distant source detected in TeV γ-rays so far. The TeV radiation is expected to be strongly absorbed by the diffuse extragalactic background radiation (DEBRA). The observed energy spectrum of TeV photons is in good agreement with an intrinsic power law spectrum of the source ∝ E −1.9 corrected for DEBRA absorption. Statistical errors as well as uncertainties about the intrinsic source spectrum, however, do not permit strong statements about the density of the DEBRA infrared photon field.

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Section: Introductionmentioning

confidence: 96%

TeV gamma rays from the blazar H 1426+428 and the diffuse extragalactic background radiation

Aharonian

Akhperjanian

Barrio

et al. 2002

A&A

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“…More recently, observations with ground-basedČerenkov telescopes have shown that at least for BL Lacertae objects the γ-ray spectrum can be traced to more than a TeV observed photon energy (Punch et al 1992;Quinn et al 1996;Catanese et al 1998;Krennrich et al 1997). In these sources the bulk of luminosity is often emitted in the form of γ-rays.…”

Section: Introductionmentioning

confidence: 99%

The influence of dust on the inverse Compton emission from jets in Active Galactic Nuclei

Arbeiter

Pohl

Schlickeiser

2002

A&A

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Abstract. The recently observed high energy γ-ray emission from more than sixty blazars is most likely caused by inverse Compton scattering of soft ambient photons, the source of which is a subject of extensive debate. We investigate the influence of a dust torus on the inverse Compton emission of the relativistic electrons in the jets of Active Galactic Nuclei. This is an extension of previous studies, in which the main focus had been on target photons emitted by the accretion disk. We show that due to the different angular distribution of the two photon fields, the beaming pattern of the respective scattered inverse Compton gamma rays are different. We also calculate the bolometric luminosity, the beaming pattern and the spectral distribution of the emitted gamma rays for the dust torus as well as for the accretion disk as the target photon source. The results show that the relative contributions of both to the gamma ray emission depend sensitively on the observer's viewing angle and the distance of the jet plasmoids from the accretion disk and the dust torus, respectively.

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“…We need also new spectra of other high redshift blazars, because now our analysis is based on only one blazar (H 1426+428). In particular, there are at least two TeV blazars with redshift similar (PKS 2155-304 at z = 0.117) or higher (1ES 2344+514 at z = 0.44) than H1426+428; but the data which are available for these blazars (Roberts et al 1998, Catanese et al 1998 are not sufficiently accurate for our analysis. Finally, we need also new SPITZER data, to improve our knowledge of the Mid and Far Infrared background.…”

Section: Pos(bdmh2004)mentioning

confidence: 99%

Extragalactic Background Light: new constraints from the study of the photon-photon absorption on blazar spectra

Mapelli¹,

Salvaterra²,

Ferrara³

2004

Proceedings of Baryons in Dark Matter Halos — PoS(BDMH2004)

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The study of the Extragalactic Background Light (EBL) is crucial to understand many astrophysical problems (as the formation of first stars, the evolution of galaxies and the role of dust emission). At present, one of the most powerful ways to put constraints on EBL is represented by the study of the photon-photon absorption on gamma-ray spectra of TeV blazars. Adopting this method, we found that, if the only contribution to the optical and Near Infrared (NIR) background is given by galaxies, the spectrum of the blazar H 1426+428 cannot be fitted. To reproduce the observational data of H 1426+428 a Near Infrared excess with respect to galaxy counts is required, with amplitude consistent with both the Matsumoto et al. (2000) data with Kelsall's model of zodiacal light (ZL) subtraction and the DIRBE data with Wright's model of ZL subtraction. The derived constraints on the optical EBL are weaker, because the experimental errors on blazar data are still bigger than the differences among various optical EBL models. In the mid-infrared the SPITZER measurement of νI ν =2.7 nW m −2 sr −1 at 24 µm, provides the best fit of the blazar spectrum.

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Discovery of Gamma‐Ray Emission above 350 GeV from the BL Lacertae Object 1ES 2344+514

Cited by 169 publications

References 36 publications

TeV gamma rays from the blazar H 1426+428 and the diffuse extragalactic background radiation

TeV gamma rays from the blazar H 1426+428 and the diffuse extragalactic background radiation

The influence of dust on the inverse Compton emission from jets in Active Galactic Nuclei

Extragalactic Background Light: new constraints from the study of the photon-photon absorption on blazar spectra

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