Gamma-ray observations of the galactic plane at energies E > 500 GeV

S. LeBohec; I. H. Bond; S. M. Bradbury; J. H. Buckley; A. M. Burdett; D. A. Carter-Lewis; M. Catanese; M. F. Cawley; S. Dunlea; M. D'Vali; D. J. Fegan; S. J. Fegan; J. P. Finley; J. A. Gaidos; T. A. Hall; A. M. Hillas; D. Horan; J. Knapp; F. Krennrich; R. W. Lessard; D. Macomb; C. Masterson; J. Quinn; H. J. Rose; F. W. Samuelson; G. H. Sembroski; V. V. Vassiliev; T. C. Weekes

doi:10.1086/309227

Gamma-ray observations of the galactic plane at energies E > 500 GeV

S. LeBohec, I. H. Bond, S. M. Bradbury, J. H. Buckley, A. M. Burdett, D. A. Carter-Lewis, M. Catanese, M. F. Cawley, S. Dunlea, M. D'Vali, D. J. Fegan, S. J. Fegan, J. P. Finley, J. A. Gaidos, T. A. Hall, A. M. Hillas, D. Horan, J. Knapp, F. Krennrich, R. W. LessardD. Macomb, C. Masterson, J. Quinn, H. J. Rose, F. W. Samuelson, G. H. Sembroski, V. V. Vassiliev, T. C. Weekes

Physics Department

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42 Scopus citations

Abstract

In 1998 and 1999 the Whipple Observatory 10 m telescope was used to search for diffuse γ-ray emission from the Galactic plane. At this time, the telescope was equipped with a large (4°.8) field of view camera, well suited to detect diffuse γ-ray emission. No significant evidence of emission was found. Assuming the TeV emission profile matches EGRET observations above 1 GeV with a differential spectral index of 2.4, we derive an upper limit of 3.0 × 10^-8 cm^-2 s^-1 sr^-1 for the average diffuse emission above 500 GeV in the Galactic latitude range from -2° to + 2° at Galactic longitude 40°. Comparisons with EGRET observations provide a lower limit of 2.31 for the differential spectral index of the diffuse emission, assuming there is no break in the spectrum between 30 and 500 GeV. This constrains models for diffuse emission with a significant inverse Compton contribution.

Original language	English
Pages (from-to)	209-215
Number of pages	7
Journal	Astrophysical Journal
Volume	539
Issue number	1 PART 1
DOIs	https://doi.org/10.1086/309227
State	Published - 10 Aug 2000

Keywords

Cosmic rays
Diffuse radiation
Gamma rays: observations

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LeBohec, S., Bond, I. H., Bradbury, S. M., Buckley, J. H., Burdett, A. M., Carter-Lewis, D. A., Catanese, M., Cawley, M. F., Dunlea, S., D'Vali, M., Fegan, D. J., Fegan, S. J., Finley, J. P., Gaidos, J. A., Hall, T. A., Hillas, A. M., Horan, D., Knapp, J., Krennrich, F., ... Weekes, T. C. (2000). Gamma-ray observations of the galactic plane at energies E > 500 GeV. Astrophysical Journal, 539(1 PART 1), 209-215. https://doi.org/10.1086/309227

@article{db0f7018ecfe40eba3a24a8c67811748,

title = "Gamma-ray observations of the galactic plane at energies E > 500 GeV",

abstract = "In 1998 and 1999 the Whipple Observatory 10 m telescope was used to search for diffuse γ-ray emission from the Galactic plane. At this time, the telescope was equipped with a large (4°.8) field of view camera, well suited to detect diffuse γ-ray emission. No significant evidence of emission was found. Assuming the TeV emission profile matches EGRET observations above 1 GeV with a differential spectral index of 2.4, we derive an upper limit of 3.0 × 10-8 cm-2 s-1 sr-1 for the average diffuse emission above 500 GeV in the Galactic latitude range from -2° to + 2° at Galactic longitude 40°. Comparisons with EGRET observations provide a lower limit of 2.31 for the differential spectral index of the diffuse emission, assuming there is no break in the spectrum between 30 and 500 GeV. This constrains models for diffuse emission with a significant inverse Compton contribution.",

keywords = "Cosmic rays, Diffuse radiation, Gamma rays: observations",

author = "S. LeBohec and Bond, {I. H.} and Bradbury, {S. M.} and Buckley, {J. H.} and Burdett, {A. M.} and Carter-Lewis, {D. A.} and M. Catanese and Cawley, {M. F.} and S. Dunlea and M. D'Vali and Fegan, {D. J.} and Fegan, {S. J.} and Finley, {J. P.} and Gaidos, {J. A.} and Hall, {T. A.} and Hillas, {A. M.} and D. Horan and J. Knapp and F. Krennrich and Lessard, {R. W.} and D. Macomb and C. Masterson and J. Quinn and Rose, {H. J.} and Samuelson, {F. W.} and Sembroski, {G. H.} and Vassiliev, {V. V.} and Weekes, {T. C.}",

year = "2000",

month = aug,

day = "10",

doi = "10.1086/309227",

language = "English",

volume = "539",

pages = "209--215",

number = "1 PART 1",

}

LeBohec, S, Bond, IH, Bradbury, SM, Buckley, JH, Burdett, AM, Carter-Lewis, DA, Catanese, M, Cawley, MF, Dunlea, S, D'Vali, M, Fegan, DJ, Fegan, SJ, Finley, JP, Gaidos, JA, Hall, TA, Hillas, AM, Horan, D, Knapp, J, Krennrich, F, Lessard, RW, Macomb, D, Masterson, C, Quinn, J, Rose, HJ, Samuelson, FW, Sembroski, GH, Vassiliev, VV & Weekes, TC 2000, 'Gamma-ray observations of the galactic plane at energies E > 500 GeV', Astrophysical Journal, vol. 539, no. 1 PART 1, pp. 209-215. https://doi.org/10.1086/309227

TY - JOUR

T1 - Gamma-ray observations of the galactic plane at energies E > 500 GeV

AU - LeBohec, S.

AU - Bond, I. H.

AU - Bradbury, S. M.

AU - Buckley, J. H.

AU - Burdett, A. M.

AU - Carter-Lewis, D. A.

AU - Catanese, M.

AU - Cawley, M. F.

AU - Dunlea, S.

AU - D'Vali, M.

AU - Fegan, D. J.

AU - Fegan, S. J.

AU - Finley, J. P.

AU - Gaidos, J. A.

AU - Hall, T. A.

AU - Hillas, A. M.

AU - Horan, D.

AU - Knapp, J.

AU - Krennrich, F.

AU - Lessard, R. W.

AU - Macomb, D.

AU - Masterson, C.

AU - Quinn, J.

AU - Rose, H. J.

AU - Samuelson, F. W.

AU - Sembroski, G. H.

AU - Vassiliev, V. V.

AU - Weekes, T. C.

PY - 2000/8/10

Y1 - 2000/8/10

N2 - In 1998 and 1999 the Whipple Observatory 10 m telescope was used to search for diffuse γ-ray emission from the Galactic plane. At this time, the telescope was equipped with a large (4°.8) field of view camera, well suited to detect diffuse γ-ray emission. No significant evidence of emission was found. Assuming the TeV emission profile matches EGRET observations above 1 GeV with a differential spectral index of 2.4, we derive an upper limit of 3.0 × 10-8 cm-2 s-1 sr-1 for the average diffuse emission above 500 GeV in the Galactic latitude range from -2° to + 2° at Galactic longitude 40°. Comparisons with EGRET observations provide a lower limit of 2.31 for the differential spectral index of the diffuse emission, assuming there is no break in the spectrum between 30 and 500 GeV. This constrains models for diffuse emission with a significant inverse Compton contribution.

AB - In 1998 and 1999 the Whipple Observatory 10 m telescope was used to search for diffuse γ-ray emission from the Galactic plane. At this time, the telescope was equipped with a large (4°.8) field of view camera, well suited to detect diffuse γ-ray emission. No significant evidence of emission was found. Assuming the TeV emission profile matches EGRET observations above 1 GeV with a differential spectral index of 2.4, we derive an upper limit of 3.0 × 10-8 cm-2 s-1 sr-1 for the average diffuse emission above 500 GeV in the Galactic latitude range from -2° to + 2° at Galactic longitude 40°. Comparisons with EGRET observations provide a lower limit of 2.31 for the differential spectral index of the diffuse emission, assuming there is no break in the spectrum between 30 and 500 GeV. This constrains models for diffuse emission with a significant inverse Compton contribution.

KW - Cosmic rays

KW - Diffuse radiation

KW - Gamma rays: observations

UR - http://www.scopus.com/inward/record.url?scp=0034632310&partnerID=8YFLogxK

U2 - 10.1086/309227

DO - 10.1086/309227

M3 - Article

AN - SCOPUS:0034632310

SN - 0004-637X

VL - 539

SP - 209

EP - 215

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART 1

ER -

Gamma-ray observations of the galactic plane at energies E > 500 GeV

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Keywords

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