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Journal Articles The Astrophysical Journal Year : 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

Markus Ackermann , Marco Ajello , A. Allafort , K. Asano , W.B. Atwood , Luca Baldini , Jean Ballet (1) , Guido Barbiellini , D. Bastieri , K. Bechtol , R. Bellazzini , E.D. Bloom , E. Bonamente , A.W. Borgland , E. Bottacini , T.J. Brandt , J. Bregeon , M. Brigida , Pascal Bruel (2) , R. Buehler , T.H. Burnett , G. Busetto , S. Buson , G.A. Caliandro , R.A. Cameron , P. A. Caraveo , J.M. Casandjian (1) , C. Cecchi , E. Charles (3) , S. Chaty , A. Chekhtman , C.C. Cheung , J. Chiang , A.N. Cillis , S. Ciprini , R. Claus , J. Cohen-Tanugi , S. Colafrancesco , J. Conrad , S. Cutini , F. d'Ammando , F. de Palma , C.D. Dermer , E.D.E. Silva , Do Couto , S. Drell , A. Drlica-Wagner , R. Dubois , C. Favuzzi , S.J. Fegan (2) , E.C. Ferrara , W.B. Focke , Y. Fukazawa , S. Funk , P. Fusco (4) , F. Gargano (4) , D. Gasparrini , N. Gehrels , S. Germani , N. Giglietto , F. Giordano (4) , M. Giroletti , T. Glanzman , G. Godfrey , P. Grandi , I.A. Grenier , J.E. Grove , S. Guiriec , D. Hadasch , M. Hayashida , E. Hays , D. Horan (2) , X. Hou (5) , R.E. Hughes , M.S. Jackson , T. Jogler , G. Jóhannesson , R.P. Johnson , A.S. Johnson , T. Kamae , J. Kataoka , M. Kerr , Jürgen Knödlseder , M. Kuss , J. Lande , S. Larsson , L. Latronico , C. Lavalley , S.H. Lee , F. Longo , F. Loparco (4) , B. Lott (5) , M.N. Lovellette , P. Lubrano , M.N. Mazziotta (4) , W. Mcconville , J.E. Mcenery , J. Mehault (6) , P.F. Michelson , R.P. Mignani , W. Mitthumsiri , T. Mizuno , A.A. Moiseev , C. Monte , M.E. Monzani , A. Morselli , I.V. Moskalenko , S. Murgia , M. Naumann-Godo , R. Nemmen , S. Nishino , J.P. Norris , E. Nuss (6) , T. Ohsugi , N. Omodei , M. Orienti , E. Orlando , J.F. Ormes , D. Paneque , J.H. Panetta , V. Pelassa , J.S. Perkins , M. Pesce-Rollins , M. Pierbattista (1) , F. Piron (6) , G. Pivato , H. Poon , T.A. Porter , S. Rainò , R. Rando , M. Razzano , S. Razzaque , A. Reimer , O. Reimer , L.C. Reyes , S. Ritz , L.S. Rochester , C. Romoli , M. Roth , D.A. Sanchez , P.M. Saz Parkinson , J.D. Scargle , C. Sgrò , E.J. Siskind , A. Snyder , G. Spandre , P. Spinelli , T.E. Stephens , D.J. Suson , H. Tajima , H. Takahashi , T. Tanaka , J.G. Thayer , D.J. Thompson , L. Tibaldo , O. Tibolla , M. Tinivella , G. Tosti , E. Troja , T.L. Usher , J. Vandenbroucke , V. Vasileiou (6) , G. Vianello , V. Vitale , A. von Kienlin , A.M. Waite , E. Wallace , P. Weltevrede , B.L. Winer , K.S. Wood , M. Wood , S. Zimmer
Markus Ackermann
  • Function : Author
Marco Ajello
  • Function : Author
A. Allafort
  • Function : Author
K. Asano
W.B. Atwood
  • Function : Author
Luca Baldini
  • Function : Author
Guido Barbiellini
  • Function : Author
D. Bastieri
  • Function : Author
K. Bechtol
  • Function : Author
R. Bellazzini
  • Function : Author
E.D. Bloom
  • Function : Author
E. Bonamente
  • Function : Author
A.W. Borgland
  • Function : Author
E. Bottacini
  • Function : Author
T.J. Brandt
  • Function : Author
J. Bregeon
M. Brigida
  • Function : Author
R. Buehler
  • Function : Author
T.H. Burnett
  • Function : Author
G. Busetto
S. Buson
  • Function : Author
G.A. Caliandro
  • Function : Author
R.A. Cameron
  • Function : Author
P. A. Caraveo
  • Function : Author
C. Cecchi
  • Function : Author
S. Chaty
A. Chekhtman
  • Function : Author
C.C. Cheung
  • Function : Author
J. Chiang
  • Function : Author
A.N. Cillis
  • Function : Author
S. Ciprini
  • Function : Author
R. Claus
  • Function : Author
J. Cohen-Tanugi
S. Colafrancesco
  • Function : Author
J. Conrad
  • Function : Author
S. Cutini
  • Function : Author
F. d'Ammando
  • Function : Author
F. de Palma
  • Function : Author
C.D. Dermer
  • Function : Author
E.D.E. Silva
  • Function : Author
Do Couto
  • Function : Author
S. Drell
  • Function : Author
A. Drlica-Wagner
  • Function : Author
R. Dubois
  • Function : Author
C. Favuzzi
  • Function : Author
S.J. Fegan
E.C. Ferrara
  • Function : Author
W.B. Focke
  • Function : Author
Y. Fukazawa
S. Funk
  • Function : Author
D. Gasparrini
  • Function : Author
N. Gehrels
  • Function : Author
S. Germani
  • Function : Author
N. Giglietto
M. Giroletti
  • Function : Author
T. Glanzman
  • Function : Author
G. Godfrey
  • Function : Author
P. Grandi
  • Function : Author
I.A. Grenier
  • Function : Author
J.E. Grove
  • Function : Author
S. Guiriec
  • Function : Author
D. Hadasch
M. Hayashida
  • Function : Author
E. Hays
  • Function : Author
X. Hou
  • Function : Author
R.E. Hughes
  • Function : Author
M.S. Jackson
  • Function : Author
T. Jogler
  • Function : Author
G. Jóhannesson
  • Function : Author
R.P. Johnson
  • Function : Author
A.S. Johnson
  • Function : Author
T. Kamae
  • Function : Author
J. Kataoka
  • Function : Author
M. Kerr
  • Function : Author
Jürgen Knödlseder
M. Kuss
  • Function : Author
J. Lande
  • Function : Author
S. Larsson
  • Function : Author
L. Latronico
  • Function : Author
C. Lavalley
  • Function : Author
S.H. Lee
  • Function : Author
F. Longo
B. Lott
M.N. Lovellette
  • Function : Author
P. Lubrano
  • Function : Author
W. Mcconville
  • Function : Author
J.E. Mcenery
  • Function : Author
P.F. Michelson
  • Function : Author
R.P. Mignani
  • Function : Author
W. Mitthumsiri
  • Function : Author
T. Mizuno
  • Function : Author
A.A. Moiseev
C. Monte
  • Function : Author
M.E. Monzani
  • Function : Author
A. Morselli
  • Function : Author
I.V. Moskalenko
  • Function : Author
S. Murgia
  • Function : Author
M. Naumann-Godo
  • Function : Author
R. Nemmen
  • Function : Author
S. Nishino
  • Function : Author
J.P. Norris
  • Function : Author
T. Ohsugi
  • Function : Author
N. Omodei
  • Function : Author
M. Orienti
  • Function : Author
E. Orlando
  • Function : Author
J.F. Ormes
  • Function : Author
D. Paneque
J.H. Panetta
  • Function : Author
V. Pelassa
  • Function : Author
J.S. Perkins
  • Function : Author
M. Pesce-Rollins
G. Pivato
  • Function : Author
H. Poon
  • Function : Author
T.A. Porter
  • Function : Author
S. Rainò
  • Function : Author
R. Rando
  • Function : Author
M. Razzano
  • Function : Author
S. Razzaque
  • Function : Author
A. Reimer
O. Reimer
  • Function : Author
L.C. Reyes
  • Function : Author
S. Ritz
  • Function : Author
L.S. Rochester
  • Function : Author
C. Romoli
M. Roth
  • Function : Author
D.A. Sanchez
  • Function : Author
P.M. Saz Parkinson
  • Function : Author
J.D. Scargle
  • Function : Author
C. Sgrò
  • Function : Author
E.J. Siskind
  • Function : Author
A. Snyder
  • Function : Author
G. Spandre
  • Function : Author
P. Spinelli
  • Function : Author
T.E. Stephens
  • Function : Author
D.J. Suson
  • Function : Author
H. Tajima
  • Function : Author
H. Takahashi
  • Function : Author
T. Tanaka
J.G. Thayer
  • Function : Author
D.J. Thompson
  • Function : Author
L. Tibaldo
  • Function : Author
O. Tibolla
  • Function : Author
M. Tinivella
  • Function : Author
G. Tosti
  • Function : Author
E. Troja
  • Function : Author
T.L. Usher
  • Function : Author
J. Vandenbroucke
  • Function : Author
G. Vianello
  • Function : Author
V. Vitale
A. von Kienlin
  • Function : Author
A.M. Waite
  • Function : Author
E. Wallace
  • Function : Author
P. Weltevrede
  • Function : Author
B.L. Winer
  • Function : Author
K.S. Wood
  • Function : Author
M. Wood
  • Function : Author
S. Zimmer
  • Function : Author

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.

Dates and versions

in2p3-00823282 , version 1 (16-05-2013)

Identifiers

Cite

Markus Ackermann, Marco Ajello, A. Allafort, K. Asano, W.B. Atwood, et al.. 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. The Astrophysical Journal, 2013, 765, pp.54. ⟨10.1088/0004-637X/765/1/54⟩. ⟨in2p3-00823282⟩
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