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Abstract:

The Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope is a pair-conversion telescope designed to detect photons with energies from ≈20 MeV to >300 GeV. The pre-launch response functions of the LAT were determined through extensive Monte Carlo simulations and beam tests. The point-spread function (PSF) characterizing the angular distribution of reconstructed photons as a function of energy and geometry in the detector is determined here from two years of on-orbit data by examining the distributions of γ rays from pulsars and active galactic nuclei (AGNs). Above 3 GeV, the PSF is found to be broader than the pre-launch PSF. We checked for dependence of the PSF on the class of γ-ray source and observation epoch and found none. We also investigated several possible spatial models for pair-halo emission around BL Lac AGNs. We found no evidence for a component with spatial extension larger than the PSF and set upper limits on the amplitude of halo emission in stacked images of low- and high-redshift BL Lac AGNs and the TeV blazars 1ES0229+200 and 1ES0347-121. © 2013. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:Determination of the point-spread function for the fermi large area telescope from on-orbit data and limits on pair halos of active galactic nuclei
Autor:Ackermann, M. et al.
Este artículo contiene 174 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 174 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Palabras clave:galaxies: active; galaxies: halos; gamma rays: galaxies; instrumentation: detectors; intergalactic medium
Año:2013
Volumen:765
Número:1
DOI: http://dx.doi.org/10.1088/0004-637X/765/1/54
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v765_n1_p_Ackermann

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Citas:

---------- APA ----------
(2013) . Determination of the point-spread function for the fermi large area telescope from on-orbit data and limits on pair halos of active galactic nuclei. Astrophysical Journal, 765(1).
http://dx.doi.org/10.1088/0004-637X/765/1/54
---------- CHICAGO ----------
Ackermann, M. "Determination of the point-spread function for the fermi large area telescope from on-orbit data and limits on pair halos of active galactic nuclei" . Astrophysical Journal 765, no. 1 (2013).
http://dx.doi.org/10.1088/0004-637X/765/1/54
---------- MLA ----------
Ackermann, M. "Determination of the point-spread function for the fermi large area telescope from on-orbit data and limits on pair halos of active galactic nuclei" . Astrophysical Journal, vol. 765, no. 1, 2013.
http://dx.doi.org/10.1088/0004-637X/765/1/54
---------- VANCOUVER ----------
Ackermann, M. Determination of the point-spread function for the fermi large area telescope from on-orbit data and limits on pair halos of active galactic nuclei. Astrophys. J. 2013;765(1).
http://dx.doi.org/10.1088/0004-637X/765/1/54