Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2

A. Abramowski; F. Acero; F. Aharonian; F. Ait Benkhali; A. G. Akhperjanian; E. Angüner; G. Anton; S. Balenderan; A. Balzer; A. Barnacka; Y. Becherini; J. Becker Tjus; K. Bernlöhr; E. Birsin; E. Bissaldi; J. Biteau; M. Böttcher; C. Boisson; J. Bolmont; P. Bordas; J. Brucker; F. Brun; P. Brun; T. Bulik; S. Carrigan; S. Casanova; M. Cerruti; P. M. Chadwick; R. Chalme-Calvet; R. C G Chaves; A. Cheesebrough; M. Chrétien; A. C. Clapson; S. Colafrancesco; G. Cologna; J. Conrad; C. Couturier; Y. Cui; M. Dalton; M. K. Daniel; I. D. Davids; B. Degrange; C. Deil; P. de Wilt; H. J. Dickinson; A. Djannati-Ataï; W. Domainko; L. O C Drury; G. Dubus; C. B. Rulten; HESS Collaboration

doi:10.1093/mnras/stu2148

Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2

A. Abramowski, F. Acero, F. Aharonian, F. Ait Benkhali, A. G. Akhperjanian, E. Angüner, G. Anton, S. Balenderan, A. Balzer, A. Barnacka, Y. Becherini, J. Becker Tjus, K. Bernlöhr, E. Birsin, E. Bissaldi, J. Biteau, M. Böttcher, C. Boisson, J. Bolmont, P. BordasJ. Brucker, F. Brun, P. Brun, T. Bulik, S. Carrigan, S. Casanova, M. Cerruti, P. M. Chadwick, R. Chalme-Calvet, R. C G Chaves, A. Cheesebrough, M. Chrétien, A. C. Clapson, S. Colafrancesco, G. Cologna, J. Conrad, C. Couturier, Y. Cui, M. Dalton, M. K. Daniel, I. D. Davids, B. Degrange, C. Deil, P. de Wilt, H. J. Dickinson, A. Djannati-Ataï, W. Domainko, L. O C Drury, G. Dubus, C. B. Rulten, HESS Collaboration

Physics and Astronomy (Twin Cities)

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Abstract

The region around the supernova remnant (SNR) W41 contains several TeV sources and has prompted the HESS Collaboration to perform deep observations of this field of view. This resulted in the discovery of the new very high energy (VHE) source HESS J1832-093, at the position RA = 18^h32^m50^s ± 3_stat ^s ± 2_syst ^s, Dec = -9°22'36″ ± 32_stat ^″ ± 20_syst ^″(J2000), spatially coincident with a part of the radio shell of the neighbouring remnant G22.7-0.2. The photon spectrum is well described by a power law of index Γ = 2.6 ± 0.3_stat ± 0.1_syst and a normalization at 1 TeV of Φ₀ = (4.8 ± 0.8_stat ± 1.0_syst) × 10^-13 cm^-2 s^-1 TeV^-1. The location of the gamma-ray emission on the edge of the SNR rim first suggested a signature of escaping cosmic rays illuminating a nearby molecular cloud. Then a dedicated XMM-Newton observation led to the discovery of a new X-ray point source spatially coincident with the TeV excess. Two other scenarios were hence proposed to identify the nature of HESS J1832-093. Gamma-rays from inverse Compton radiation in the framework of a pulsar wind nebula scenario or the possibility of gamma-ray production within a binary system are therefore also considered. Deeper multiwavelength observations will help to shed new light on this intriguing VHE source.

Original language	English (US)
Pages (from-to)	1163-1169
Number of pages	7
Journal	Monthly Notices of the Royal Astronomical Society
Volume	446
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stu2148
State	Published - 2015

Bibliographical note

Publisher Copyright:
© 2014 The Authors.

Keywords

Astroparticle physics
Gamma-rays: general
ISM: individual objects: HESS J1832-093
ISM: individual objects: SNR G22.7-0.2

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Abramowski, A., Acero, F., Aharonian, F., Ait Benkhali, F., Akhperjanian, A. G., Angüner, E., Anton, G., Balenderan, S., Balzer, A., Barnacka, A., Becherini, Y., Becker Tjus, J., Bernlöhr, K., Birsin, E., Bissaldi, E., Biteau, J., Böttcher, M., Boisson, C., Bolmont, J., ... HESS Collaboration (2015). Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2. Monthly Notices of the Royal Astronomical Society, 446(2), 1163-1169. https://doi.org/10.1093/mnras/stu2148

Abramowski, A, Acero, F, Aharonian, F, Ait Benkhali, F, Akhperjanian, AG, Angüner, E, Anton, G, Balenderan, S, Balzer, A, Barnacka, A, Becherini, Y, Becker Tjus, J, Bernlöhr, K, Birsin, E, Bissaldi, E, Biteau, J, Böttcher, M, Boisson, C, Bolmont, J, Bordas, P, Brucker, J, Brun, F, Brun, P, Bulik, T, Carrigan, S, Casanova, S, Cerruti, M, Chadwick, PM, Chalme-Calvet, R, Chaves, RCG, Cheesebrough, A, Chrétien, M, Clapson, AC, Colafrancesco, S, Cologna, G, Conrad, J, Couturier, C, Cui, Y, Dalton, M, Daniel, MK, Davids, ID, Degrange, B, Deil, C, de Wilt, P, Dickinson, HJ, Djannati-Ataï, A, Domainko, W, Drury, LOC, Dubus, G, Rulten, CB & HESS Collaboration 2015, 'Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2', Monthly Notices of the Royal Astronomical Society, vol. 446, no. 2, pp. 1163-1169. https://doi.org/10.1093/mnras/stu2148

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title = "Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2",

abstract = "The region around the supernova remnant (SNR) W41 contains several TeV sources and has prompted the HESS Collaboration to perform deep observations of this field of view. This resulted in the discovery of the new very high energy (VHE) source HESS J1832-093, at the position RA = 18h32m50s ± 3stat s ± 2syst s, Dec = -9°22'36″ ± 32stat ″ ± 20syst ″(J2000), spatially coincident with a part of the radio shell of the neighbouring remnant G22.7-0.2. The photon spectrum is well described by a power law of index Γ = 2.6 ± 0.3stat ± 0.1syst and a normalization at 1 TeV of Φ0 = (4.8 ± 0.8stat ± 1.0syst) × 10-13 cm-2 s-1 TeV-1. The location of the gamma-ray emission on the edge of the SNR rim first suggested a signature of escaping cosmic rays illuminating a nearby molecular cloud. Then a dedicated XMM-Newton observation led to the discovery of a new X-ray point source spatially coincident with the TeV excess. Two other scenarios were hence proposed to identify the nature of HESS J1832-093. Gamma-rays from inverse Compton radiation in the framework of a pulsar wind nebula scenario or the possibility of gamma-ray production within a binary system are therefore also considered. Deeper multiwavelength observations will help to shed new light on this intriguing VHE source.",

keywords = "Astroparticle physics, Gamma-rays: general, ISM: individual objects: HESS J1832-093, ISM: individual objects: SNR G22.7-0.2",

author = "A. Abramowski and F. Acero and F. Aharonian and {Ait Benkhali}, F. and Akhperjanian, {A. G.} and E. Ang{\"u}ner and G. Anton and S. Balenderan and A. Balzer and A. Barnacka and Y. Becherini and {Becker Tjus}, J. and K. Bernl{\"o}hr and E. Birsin and E. Bissaldi and J. Biteau and M. B{\"o}ttcher and C. Boisson and J. Bolmont and P. Bordas and J. Brucker and F. Brun and P. Brun and T. Bulik and S. Carrigan and S. Casanova and M. Cerruti and Chadwick, {P. M.} and R. Chalme-Calvet and Chaves, {R. C G} and A. Cheesebrough and M. Chr{\'e}tien and Clapson, {A. C.} and S. Colafrancesco and G. Cologna and J. Conrad and C. Couturier and Y. Cui and M. Dalton and Daniel, {M. K.} and Davids, {I. D.} and B. Degrange and C. Deil and {de Wilt}, P. and Dickinson, {H. J.} and A. Djannati-Ata{\"i} and W. Domainko and Drury, {L. O C} and G. Dubus and Rulten, {C. B.} and {HESS Collaboration}",

note = "Publisher Copyright: {\textcopyright} 2014 The Authors.",

year = "2015",

doi = "10.1093/mnras/stu2148",

language = "English (US)",

volume = "446",

pages = "1163--1169",

journal = "Monthly Notices of the Royal Astronomical Society",

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T1 - Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2

AU - Abramowski, A.

AU - Acero, F.

AU - Aharonian, F.

AU - Ait Benkhali, F.

AU - Akhperjanian, A. G.

AU - Angüner, E.

AU - Anton, G.

AU - Balenderan, S.

AU - Balzer, A.

AU - Barnacka, A.

AU - Becherini, Y.

AU - Becker Tjus, J.

AU - Bernlöhr, K.

AU - Birsin, E.

AU - Bissaldi, E.

AU - Biteau, J.

AU - Böttcher, M.

AU - Boisson, C.

AU - Bolmont, J.

AU - Bordas, P.

AU - Brucker, J.

AU - Brun, F.

AU - Brun, P.

AU - Bulik, T.

AU - Carrigan, S.

AU - Casanova, S.

AU - Cerruti, M.

AU - Chadwick, P. M.

AU - Chalme-Calvet, R.

AU - Chaves, R. C G

AU - Cheesebrough, A.

AU - Chrétien, M.

AU - Clapson, A. C.

AU - Colafrancesco, S.

AU - Cologna, G.

AU - Conrad, J.

AU - Couturier, C.

AU - Cui, Y.

AU - Dalton, M.

AU - Daniel, M. K.

AU - Davids, I. D.

AU - Degrange, B.

AU - Deil, C.

AU - de Wilt, P.

AU - Dickinson, H. J.

AU - Djannati-Ataï, A.

AU - Domainko, W.

AU - Drury, L. O C

AU - Dubus, G.

AU - Rulten, C. B.

AU - HESS Collaboration

PY - 2015

Y1 - 2015

N2 - The region around the supernova remnant (SNR) W41 contains several TeV sources and has prompted the HESS Collaboration to perform deep observations of this field of view. This resulted in the discovery of the new very high energy (VHE) source HESS J1832-093, at the position RA = 18h32m50s ± 3stat s ± 2syst s, Dec = -9°22'36″ ± 32stat ″ ± 20syst ″(J2000), spatially coincident with a part of the radio shell of the neighbouring remnant G22.7-0.2. The photon spectrum is well described by a power law of index Γ = 2.6 ± 0.3stat ± 0.1syst and a normalization at 1 TeV of Φ0 = (4.8 ± 0.8stat ± 1.0syst) × 10-13 cm-2 s-1 TeV-1. The location of the gamma-ray emission on the edge of the SNR rim first suggested a signature of escaping cosmic rays illuminating a nearby molecular cloud. Then a dedicated XMM-Newton observation led to the discovery of a new X-ray point source spatially coincident with the TeV excess. Two other scenarios were hence proposed to identify the nature of HESS J1832-093. Gamma-rays from inverse Compton radiation in the framework of a pulsar wind nebula scenario or the possibility of gamma-ray production within a binary system are therefore also considered. Deeper multiwavelength observations will help to shed new light on this intriguing VHE source.

AB - The region around the supernova remnant (SNR) W41 contains several TeV sources and has prompted the HESS Collaboration to perform deep observations of this field of view. This resulted in the discovery of the new very high energy (VHE) source HESS J1832-093, at the position RA = 18h32m50s ± 3stat s ± 2syst s, Dec = -9°22'36″ ± 32stat ″ ± 20syst ″(J2000), spatially coincident with a part of the radio shell of the neighbouring remnant G22.7-0.2. The photon spectrum is well described by a power law of index Γ = 2.6 ± 0.3stat ± 0.1syst and a normalization at 1 TeV of Φ0 = (4.8 ± 0.8stat ± 1.0syst) × 10-13 cm-2 s-1 TeV-1. The location of the gamma-ray emission on the edge of the SNR rim first suggested a signature of escaping cosmic rays illuminating a nearby molecular cloud. Then a dedicated XMM-Newton observation led to the discovery of a new X-ray point source spatially coincident with the TeV excess. Two other scenarios were hence proposed to identify the nature of HESS J1832-093. Gamma-rays from inverse Compton radiation in the framework of a pulsar wind nebula scenario or the possibility of gamma-ray production within a binary system are therefore also considered. Deeper multiwavelength observations will help to shed new light on this intriguing VHE source.

KW - Astroparticle physics

KW - Gamma-rays: general

KW - ISM: individual objects: HESS J1832-093

KW - ISM: individual objects: SNR G22.7-0.2

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Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2

Abstract

Bibliographical note

Keywords

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