The University of Southampton
University of Southampton Institutional Repository

Discovery and follow-up studies of the extended, off-plane, VHE gamma-ray source HESS J1507-622

Discovery and follow-up studies of the extended, off-plane, VHE gamma-ray source HESS J1507-622
Discovery and follow-up studies of the extended, off-plane, VHE gamma-ray source HESS J1507-622
Context. The detection of gamma-rays in the very-high-energy (VHE) range (100 GeV?100 TeV) offers the possibility of studying the parent population of ultrarelativistic particles found in astrophysical sources, so it is useful for understanding the underlying astrophysical processes in nonthermal sources.

Aims. The discovery of the VHE gamma-ray source HESS J1507-622 is reported and possibilities regarding its nature are investigated.

Methods. The H.E.S.S. array of imaging atmospheric Cherenkov telescopes (IACTs) has a high sensitivity compared with previous instruments (~1% of the Crab flux in 25 h observation time for a 5? point-source detection) and has a large field of view (~5° in diameter). HESS J1507-622 was discovered within the ongoing H.E.S.S. survey of the inner Galaxy, and the source was also studied by means of dedicated multiwavelength observations.

Results. A Galactic gamma-ray source, HESS J1507-622, located ~3.5° from the Galactic plane was detected with a statistical significance >9?. Its energy spectrum is well fitted by a power law with spectral index ? = 2.24 ± 0.16stat ± 0.20sys and a flux above 1 TeV of (1.5 ± 0.4stat ± 0.3sys) × 10-12 cm-2 s-1. Possible interpretations (considering both hadronic and leptonic models) of the VHE gamma-ray emission are discussed in the absence of an obvious counterpart.
0004-6361
1-7
Acero, F.
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Aharonian, F.
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Degrange, B.
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Deil, C.
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Dickinson, H. J.
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Domainko, W.
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Zdziarski, A. A.
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Acero, F., Aharonian, F. and Akhperjanian, A.G. et al. (2011) Discovery and follow-up studies of the extended, off-plane, VHE gamma-ray source HESS J1507-622. Astronomy & Astrophysics, 525 (A45), 1-7. (doi:10.1051/0004-6361/201015187).

Record type: Article

Abstract

Context. The detection of gamma-rays in the very-high-energy (VHE) range (100 GeV?100 TeV) offers the possibility of studying the parent population of ultrarelativistic particles found in astrophysical sources, so it is useful for understanding the underlying astrophysical processes in nonthermal sources.

Aims. The discovery of the VHE gamma-ray source HESS J1507-622 is reported and possibilities regarding its nature are investigated.

Methods. The H.E.S.S. array of imaging atmospheric Cherenkov telescopes (IACTs) has a high sensitivity compared with previous instruments (~1% of the Crab flux in 25 h observation time for a 5? point-source detection) and has a large field of view (~5° in diameter). HESS J1507-622 was discovered within the ongoing H.E.S.S. survey of the inner Galaxy, and the source was also studied by means of dedicated multiwavelength observations.

Results. A Galactic gamma-ray source, HESS J1507-622, located ~3.5° from the Galactic plane was detected with a statistical significance >9?. Its energy spectrum is well fitted by a power law with spectral index ? = 2.24 ± 0.16stat ± 0.20sys and a flux above 1 TeV of (1.5 ± 0.4stat ± 0.3sys) × 10-12 cm-2 s-1. Possible interpretations (considering both hadronic and leptonic models) of the VHE gamma-ray emission are discussed in the absence of an obvious counterpart.

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Accepted/In Press date: 7 October 2010
Published date: January 2011
Organisations: Astronomy Group

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Local EPrints ID: 401580
URI: https://eprints.soton.ac.uk/id/eprint/401580
ISSN: 0004-6361
PURE UUID: 53f72794-ad72-4f2b-a6f6-134cc54713eb
ORCID for Dimitrios Emmanoulopoulos: ORCID iD orcid.org/0000-0002-3335-2446

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Date deposited: 19 Oct 2016 15:42
Last modified: 06 Jun 2018 12:35

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Contributors

Author: F. Acero
Author: F. Aharonian
Author: A.G. Akhperjanian
Author: G. Anton
Author: U. Barres de Almeida
Author: A. R. Bazer-Bachi
Author: Y. Becherini
Author: B. Behera
Author: K. Bernlöhr
Author: A. Bochow
Author: C. Boisson
Author: J. Bolmont
Author: V. Borrel
Author: J. Brucker
Author: F. Brun
Author: P. Brun
Author: R. Bühler
Author: T. Bulik
Author: I. Büsching
Author: T. Boutelier
Author: P. M. Chadwick
Author: A. Charbonnier
Author: R. C. G. Chaves
Author: A. Cheesebrough
Author: L.-M. Chounet
Author: A. C. Clapson
Author: G. Coignet
Author: M. Dalton
Author: M. K. Daniel
Author: I. D. Davids
Author: B. Degrange
Author: C. Deil
Author: H. J. Dickinson
Author: A. Djannati-Ataï
Author: W. Domainko
Author: L. O’C. Drury
Author: F. Dubois
Author: G. Dubus
Author: J. Dyks
Author: M. Dyrda
Author: K. Egberts
Author: P. Espigat
Author: C. Farnier
Author: F. Feinstein
Author: A. Fiasson
Author: A. Förster
Author: G. Fontaine
Author: M. Füßling
Author: S. Gabici
Author: Y. A. Gallant
Author: L. Gérard
Author: D. Gerbig
Author: B. Giebels
Author: J. F. Glicenstein
Author: B. Glück
Author: P. Goret
Author: D. Göring
Author: D. Hauser
Author: M. Hauser
Author: S. Heinz
Author: G. Heinzelmann
Author: G. Henri
Author: G. Hermann
Author: J. A. Hinton
Author: A. Hoffmann
Author: W. Hofmann
Author: M. Holleran
Author: S. Hoppe
Author: D. Horns
Author: A. Jacholkowska
Author: O. C. de Jager
Author: C. Jahn
Author: I. Jung
Author: K. Katarzyński
Author: U. Katz
Author: S. Kaufmann
Author: M. Kerschhaggl
Author: D. Khangulyan
Author: B. Khélifi
Author: D. Keogh
Author: D. Klochkov
Author: W. Kluźniak
Author: T. Kneiske
Author: Nu. Komin
Author: K. Kosack
Author: R. Kossakowski
Author: G. Lamanna
Author: J.-P. Lenain
Author: T. Lohse
Author: V. Marandon
Author: O. Martineau-Huynh
Author: A. Marcowith
Author: J. Masbou
Author: D. Maurin
Author: T. J. L. McComb
Author: M. C. Medina
Author: J. Méhault
Author: R. Moderski
Author: E. Moulin
Author: M. Naumann-Godo
Author: M. de Naurois
Author: D. Nedbal
Author: D. Nekrassov
Author: B. Nicholas
Author: J. Niemiec
Author: S. J. Nolan
Author: S. Ohm
Author: J.-F. Olive
Author: E. de Oña Wilhelmi
Author: K. J. Orford
Author: M. Ostrowski
Author: M. Panter
Author: M. Paz Arribas
Author: G. Pedaletti
Author: G. Pelletier
Author: P.-O. Petrucci
Author: S. Pita
Author: G. Pühlhofer
Author: M. Punch
Author: A. Quirrenbach
Author: B. C. Raubenheimer
Author: M. Raue
Author: S. M. Rayner
Author: O. Reimer
Author: M. Renaud
Author: F. Rieger
Author: J. Ripken
Author: L. Rob
Author: S. Rosier-Lees
Author: G. Rowell
Author: B. Rudak
Author: C. B. Rulten
Author: J. Ruppel
Author: V. Sahakian
Author: A. Santangelo
Author: R. Schlickeiser
Author: F. M. Schöck
Author: U. Schwanke
Author: S. Schwarzburg
Author: S. Schwemmer
Author: A. Shalchi
Author: M. Sikora
Author: J. L. Skilton
Author: H. Sol
Author: Ł. Stawarz
Author: R. Steenkamp
Author: C. Stegmann
Author: F. Stinzing
Author: G. Superina
Author: A. Szostek
Author: P. H. Tam
Author: J.-P. Tavernet
Author: R. Terrier
Author: O. Tibolla
Author: M. Tluczykont
Author: C. van Eldik
Author: G. Vasileiadis
Author: C. Venter
Author: L. Venter
Author: J. P. Vialle
Author: P. Vincent
Author: M. Vivier
Author: H. J. Völk
Author: F. Volpe
Author: S. J. Wagner
Author: M. Ward
Author: A. A. Zdziarski
Author: A. Zech

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