Fermi-LAT observations of high-energy $\gamma$-ray emission toward the Galactic center

M. Ajello; A. Albert; W.B. Atwood; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; E. Bissaldi; R.D. Blandford; E.D. Bloom; R. Bonino; E. Bottacini; T.J. Brandt; J. Bregeon; P. Bruel; R. Buehler; S. Buson; G.A. Caliandro; R.A. Cameron; R. Caputo; M. Caragiulo; P.A. Caraveo; C. Cecchi; A. Chekhtman; J. Chiang; G. Chiaro; S. Ciprini; Johann Cohen-Tanugi; L.R. Cominsky; J. Conrad; S. Cutini; F. d'Ammando; A. de Angelis; F. de Palma; R. Desiante; L. Di Venere; P.S. Drell; C. Favuzzi; E.C. Ferrara; P. Fusco; F. Gargano; D. Gasparrini; N. Giglietto; P. Giommi; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; G.A. Gomez-Vargas; I.A. Grenier; S. Guiriec; M. Gustafsson; A.K. Harding; J.W. Hewitt; A.B. Hill; D. Horan; T. Jogler; G. Johannesson; A.S. Johnson; T. Kamae; C. Karwin; J. Knödlseder; M. Kuss; S. Larsson; L. Latronico; J. Li; L. Li; F. Longo; F. Loparco; M.N. Lovellette; P. Lubrano; J. Magill; S. Maldera; D. Malyshev; A. Manfreda; M. Mayer; M.N. Mazziotta; P.F. Michelson; W. Mitthumsiri; T. Mizuno; A.A. Moiseev; M.E. Monzani; A. Morselli; I.V. Moskalenko; S. Murgia; E. Nuss; M. Ohno; T. Ohsugi; N. Omodei; E. Orlando; J.F. Ormes; D. Paneque; M. Pesce-Rollins; F. Piron; G. Pivato; T.A. Porter; S. Raino; R. Rando; M. Razzano; A. Reimer; O. Reimer; S. Ritz; M. Sanchez-Conde; P.M. Saz Parkinson; C. Sgro; E.J. Siskind; D.A. Smith; F. Spada; G. Spandre; P. Spinelli; D.J. Suson; H. Tajima; H. Takahashi; J.B. Thayer; D.F. Torres; G. Tosti; E. Troja; Y. Uchiyama; G. Vianello; B.L. Winer; K.S. Wood; G. Zaharijas; S. Zimmer

doi:10.3847/0004-637X/819/1/44

Back

$Fermi-LAT observations of high-energy $\gamma$-ray emission toward the Galactic center$

Journal article

Open access

Peer reviewed

Fermi-LAT observations of high-energy $\gamma$-ray emission toward the Galactic center

M. Ajello, A. Albert, W.B. Atwood, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, E. Bissaldi, R.D. Blandford, E.D. Bloom, …

The Astrophysical Journal, Vol.819(1)

2016

DOI: https://doi.org/10.3847/0004-637X/819/1/44

Abstract

cosmic rays

Galaxy: center

gamma-rays: general

gamma-rays: ISM

radiation mechanisms: non-thermal

gamma ray: emission

emission: model

particle: interaction

electron: interaction

galaxy

GLAST

gas

cosmic radiation

background

scattering

structure

nucleus

flux

The $Fermi$ Large Area Telescope (LAT) has provided the most detailed view to date of the emission toward the Galactic center (GC) in high-energy γ-rays. This paper describes the analysis of data taken during the first 62 months of the mission in the energy range 1–100 GeV from a 15° × 15° region about the direction of the GC. Specialized interstellar emission models (IEMs) are constructed to enable the separation of the γ-ray emissions produced by cosmic ray particles interacting with the interstellar gas and radiation fields in the Milky Way into that from the inner ∼1 kpc surrounding the GC, and that from the rest of the Galaxy. A catalog of point sources for the 15° × 15° region is self-consistently constructed using these IEMs: the First Fermi-LAT Inner Galaxy Point Source Catalog (1FIG). The spatial locations, fluxes, and spectral properties of the 1FIG sources are presented, and compared with γ-ray point sources over the same region taken from existing catalogs. After subtracting the interstellar emission and point-source contributions a residual is found. If templates that peak toward the GC are used to model the positive residual the agreement with the data improves, but none of the additional templates tried account for all of its spatial structure. The spectrum of the positive residual modeled with these templates has a strong dependence on the choice of IEM.

Files and links (1)

url

Find in HALView

Metrics

1 Record Views

See more details

Details

Title: Fermi-LAT observations of high-energy $\gamma$-ray emission toward the Galactic center
Creators - without role: M. Ajello - Clemson University
A. Albert - Kavli Institute for Particle Astrophysics and Cosmology
W.B. Atwood - University of California, Santa Cruz
G. Barbiellini - University of Trieste
D. Bastieri - University of Padua
K. Bechtol - University of Wisconsin–Madison
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. Bissaldi - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
R.D. Blandford - Kavli Institute for Particle Astrophysics and Cosmology
E.D. Bloom - Kavli Institute for Particle Astrophysics and Cosmology
R. Bonino - University of Turin
E. Bottacini - Kavli Institute for Particle Astrophysics and Cosmology
T.J. Brandt - Goddard Space Flight Center
J. Bregeon - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
P. Bruel - École Polytechnique
R. Buehler - Deutsches Elektronen-Synchrotron DESY
S. Buson - University of Padua
G.A. Caliandro - SLAC National Accelerator Laboratory
R.A. Cameron - Stanford University
R. Caputo - University of California, Santa Cruz
M. Caragiulo - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
P.A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
C. Cecchi - University of Perugia
A. Chekhtman - George Mason University
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
G. Chiaro - University of Padua
S. Ciprini - Agenzia Spaziale Italiana
Johann Cohen-Tanugi - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
L.R. Cominsky - Sonoma State University
J. Conrad - Stockholm University
S. Cutini - Agenzia Spaziale Italiana
F. d'Ammando
A. de Angelis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
R. Desiante - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
L. Di Venere - Polytechnic University of Bari
P.S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
C. Favuzzi - Polytechnic University of Bari
E.C. Ferrara - Goddard Space Flight Center
P. Fusco - Polytechnic University of Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini - Agenzia Spaziale Italiana
N. Giglietto - Polytechnic University of Bari
P. Giommi - Agenzia Spaziale Italiana
F. Giordano - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
T. Glanzman - Stanford University
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
G.A. Gomez-Vargas - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I.A. Grenier - CEA Paris-Saclay
S. Guiriec - Goddard Space Flight Center
M. Gustafsson - University of Göttingen
A.K. Harding - Goddard Space Flight Center
J.W. Hewitt - University of North Florida
A.B. Hill - SLAC National Accelerator Laboratory
D. Horan - Laboratoire Leprince-Ringuet
T. Jogler - Stanford University
G. Johannesson - University of Iceland
A.S. Johnson - Kavli Institute for Particle Astrophysics and Cosmology
T. Kamae - The University of Tokyo
C. Karwin - University of California, Irvine
J. Knödlseder - Centre National de la Recherche Scientifique
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
S. Larsson - KTH Royal Institute of Technology
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
J. Li - Institute of Space Sciences
L. Li - KTH Royal Institute of Technology
F. Longo - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. Loparco - Polytechnic University of Bari
M.N. Lovellette - United States Naval Research Laboratory
P. Lubrano - University of Perugia
J. Magill - University of Maryland, College Park
S. Maldera - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
D. Malyshev - Kavli Institute for Particle Astrophysics and Cosmology
A. Manfreda - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Mayer - Deutsches Elektronen-Synchrotron DESY
M.N. Mazziotta - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
P.F. Michelson - Kavli Institute for Particle Astrophysics and Cosmology
W. Mitthumsiri - Mahidol University
T. Mizuno - Hiroshima University
A.A. Moiseev - Goddard Space Flight Center
M.E. Monzani - Kavli Institute for Particle Astrophysics and Cosmology
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I.V. Moskalenko - Stanford University
S. Murgia - University of California, Irvine
E. Nuss - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
M. Ohno - University of Denver
T. Ohsugi - Hiroshima University
N. Omodei - Kavli Institute for Particle Astrophysics and Cosmology
E. Orlando - Stanford University
J.F. Ormes - Max Planck Institute for Physics
D. Paneque - Kavli Institute for Particle Astrophysics and Cosmology
M. Pesce-Rollins - Kavli Institute for Particle Astrophysics and Cosmology
F. Piron - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Pivato - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
T.A. Porter - Kavli Institute for Particle Astrophysics and Cosmology
S. Raino - Polytechnic University of Bari
R. Rando - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Reimer - Universität Innsbruck
O. Reimer - Universität Innsbruck
S. Ritz - University of California, Santa Cruz
M. Sanchez-Conde - AlbaNova
P.M. Saz Parkinson - Laboratoire de Physique des deux infinis Bordeaux
C. Sgro - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E.J. Siskind - Real Time Tomography
D.A. Smith - Nagoya University
F. Spada - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
D.J. Suson - Institució Catalana de Recerca i Estudis Avançats
H. Tajima - Kavli Institute for Particle Astrophysics and Cosmology
H. Takahashi - University of Denver
J.B. Thayer - Stanford University
D.F. Torres - The Ohio State University
G. Tosti - University of Perugia
E. Troja - Goddard Space Flight Center
Y. Uchiyama - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
G. Vianello - Kavli Institute for Particle Astrophysics and Cosmology
B.L. Winer - University of Nova Gorica
K.S. Wood - United States Naval Research Laboratory
G. Zaharijas - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
S. Zimmer - AlbaNova
Publication Details: The Astrophysical Journal, Vol.819(1)
Identifiers: 9936124409311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: hal-02017039