Detection of sub-TeV gamma rays from the Galactic center direction by CANGAROO-II

K. Tsuchiya; R. Enomoto; L. T. Ksenofontov; M. Mori; T. Naito; A. Asahara; G. V. Bicknell; R. W. Clay; Y. Doi; P. G. Edwards; S. Gunji; S. Hara; T. Hara; T. Hattori; Sei Hayashi; C. Itoh; S. Kabuki; F. Kajino; H. Katagiri; A. Kawachi; T. Kifune; H. Kubo; T. Kurihara; R. Kurosaka; J. Kushida; Y. Matsubara; Y. Miyashita; Y. Mizumoto; H. Moro; H. Muraishi; Y. Muraki; T. Nakase; D. Nishida; K. Nishijima; M. Ohishi; K. Okumura; J. R. Patterson; R. J. Protheroe; N. Sakamoto; K. Sakurazawa; D. L. Swaby; T. Tanimori; H. Tanimura; G. Thornton; F. Tokanai; T. Uchida; S. Watanabe; T. Yamaoka; S. Yanagita; T. Yoshida; T. Yoshikoshi

doi:10.1086/421292

Detection of sub-TeV gamma rays from the Galactic center direction by CANGAROO-II

K. Tsuchiya^*, R. Enomoto, L. T. Ksenofontov, M. Mori, T. Naito, A. Asahara, G. V. Bicknell, R. W. Clay, Y. Doi, P. G. Edwards, S. Gunji, S. Hara, T. Hara, T. Hattori, Sei Hayashi, C. Itoh, S. Kabuki, F. Kajino, H. Katagiri, A. KawachiT. Kifune, H. Kubo, T. Kurihara, R. Kurosaka, J. Kushida, Y. Matsubara, Y. Miyashita, Y. Mizumoto, H. Moro, H. Muraishi, Y. Muraki, T. Nakase, D. Nishida, K. Nishijima, M. Ohishi, K. Okumura, J. R. Patterson, R. J. Protheroe, N. Sakamoto, K. Sakurazawa, D. L. Swaby, T. Tanimori, H. Tanimura, G. Thornton, F. Tokanai, T. Uchida, S. Watanabe, T. Yamaoka, S. Yanagita, T. Yoshida, T. Yoshikoshi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

We have detected sub-TeV gamma-ray emission from the direction of the Galactic center (GC) using the CANGAROO-II Imaging Atmospheric Cerenkov Telescope. We detected a statistically significant excess at energies greater than 250 GeV. The flux was 1 order of magnitude lower than that of the Crab Nebula at 1 TeV with a soft spectrum proportional to E ^-4.6±0.5. The signal centroid is consistent with the GC direction, and the observed profile is consistent with a pointlike source. Our data suggest that the GeV source 3EG J1746-2851 is identical to this TeV source, and we study the combined spectra to determine the possible origin of the gamma-ray emission. We also obtain an upper limit on the cold dark matter density in the Galactic halo.

Original language	English
Pages (from-to)	L115-L118
Journal	Astrophysical Journal
Volume	606
Issue number	2 II
DOIs	https://doi.org/10.1086/421292
Publication status	Published - 10 May 2004

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Tsuchiya, K., Enomoto, R., Ksenofontov, L. T., Mori, M., Naito, T., Asahara, A., Bicknell, G. V., Clay, R. W., Doi, Y., Edwards, P. G., Gunji, S., Hara, S., Hara, T., Hattori, T., Hayashi, S., Itoh, C., Kabuki, S., Kajino, F., Katagiri, H., ... Yoshikoshi, T. (2004). Detection of sub-TeV gamma rays from the Galactic center direction by CANGAROO-II. Astrophysical Journal, 606(2 II), L115-L118. https://doi.org/10.1086/421292

@article{3fa14f9a0e174e789994fa89c6897ced,

title = "Detection of sub-TeV gamma rays from the Galactic center direction by CANGAROO-II",

abstract = "We have detected sub-TeV gamma-ray emission from the direction of the Galactic center (GC) using the CANGAROO-II Imaging Atmospheric Cerenkov Telescope. We detected a statistically significant excess at energies greater than 250 GeV. The flux was 1 order of magnitude lower than that of the Crab Nebula at 1 TeV with a soft spectrum proportional to E -4.6±0.5. The signal centroid is consistent with the GC direction, and the observed profile is consistent with a pointlike source. Our data suggest that the GeV source 3EG J1746-2851 is identical to this TeV source, and we study the combined spectra to determine the possible origin of the gamma-ray emission. We also obtain an upper limit on the cold dark matter density in the Galactic halo.",

keywords = "Galaxy: center, Gamma rays: observations",

author = "K. Tsuchiya and R. Enomoto and Ksenofontov, {L. T.} and M. Mori and T. Naito and A. Asahara and Bicknell, {G. V.} and Clay, {R. W.} and Y. Doi and Edwards, {P. G.} and S. Gunji and S. Hara and T. Hara and T. Hattori and Sei Hayashi and C. Itoh and S. Kabuki and F. Kajino and H. Katagiri and A. Kawachi and T. Kifune and H. Kubo and T. Kurihara and R. Kurosaka and J. Kushida and Y. Matsubara and Y. Miyashita and Y. Mizumoto and H. Moro and H. Muraishi and Y. Muraki and T. Nakase and D. Nishida and K. Nishijima and M. Ohishi and K. Okumura and Patterson, {J. R.} and Protheroe, {R. J.} and N. Sakamoto and K. Sakurazawa and Swaby, {D. L.} and T. Tanimori and H. Tanimura and G. Thornton and F. Tokanai and T. Uchida and S. Watanabe and T. Yamaoka and S. Yanagita and T. Yoshida and T. Yoshikoshi",

year = "2004",

month = may,

day = "10",

doi = "10.1086/421292",

language = "English",

volume = "606",

pages = "L115--L118",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2 II",

}

Tsuchiya, K, Enomoto, R, Ksenofontov, LT, Mori, M, Naito, T, Asahara, A, Bicknell, GV, Clay, RW, Doi, Y, Edwards, PG, Gunji, S, Hara, S, Hara, T, Hattori, T, Hayashi, S, Itoh, C, Kabuki, S, Kajino, F, Katagiri, H, Kawachi, A, Kifune, T, Kubo, H, Kurihara, T, Kurosaka, R, Kushida, J, Matsubara, Y, Miyashita, Y, Mizumoto, Y, Moro, H, Muraishi, H, Muraki, Y, Nakase, T, Nishida, D, Nishijima, K, Ohishi, M, Okumura, K, Patterson, JR, Protheroe, RJ, Sakamoto, N, Sakurazawa, K, Swaby, DL, Tanimori, T, Tanimura, H, Thornton, G, Tokanai, F, Uchida, T, Watanabe, S, Yamaoka, T, Yanagita, S, Yoshida, T & Yoshikoshi, T 2004, 'Detection of sub-TeV gamma rays from the Galactic center direction by CANGAROO-II', Astrophysical Journal, vol. 606, no. 2 II, pp. L115-L118. https://doi.org/10.1086/421292

TY - JOUR

T1 - Detection of sub-TeV gamma rays from the Galactic center direction by CANGAROO-II

AU - Tsuchiya, K.

AU - Enomoto, R.

AU - Ksenofontov, L. T.

AU - Mori, M.

AU - Naito, T.

AU - Asahara, A.

AU - Bicknell, G. V.

AU - Clay, R. W.

AU - Doi, Y.

AU - Edwards, P. G.

AU - Gunji, S.

AU - Hara, S.

AU - Hara, T.

AU - Hattori, T.

AU - Hayashi, Sei

AU - Itoh, C.

AU - Kabuki, S.

AU - Kajino, F.

AU - Katagiri, H.

AU - Kawachi, A.

AU - Kifune, T.

AU - Kubo, H.

AU - Kurihara, T.

AU - Kurosaka, R.

AU - Kushida, J.

AU - Matsubara, Y.

AU - Miyashita, Y.

AU - Mizumoto, Y.

AU - Moro, H.

AU - Muraishi, H.

AU - Muraki, Y.

AU - Nakase, T.

AU - Nishida, D.

AU - Nishijima, K.

AU - Ohishi, M.

AU - Okumura, K.

AU - Patterson, J. R.

AU - Protheroe, R. J.

AU - Sakamoto, N.

AU - Sakurazawa, K.

AU - Swaby, D. L.

AU - Tanimori, T.

AU - Tanimura, H.

AU - Thornton, G.

AU - Tokanai, F.

AU - Uchida, T.

AU - Watanabe, S.

AU - Yamaoka, T.

AU - Yanagita, S.

AU - Yoshida, T.

AU - Yoshikoshi, T.

PY - 2004/5/10

Y1 - 2004/5/10

N2 - We have detected sub-TeV gamma-ray emission from the direction of the Galactic center (GC) using the CANGAROO-II Imaging Atmospheric Cerenkov Telescope. We detected a statistically significant excess at energies greater than 250 GeV. The flux was 1 order of magnitude lower than that of the Crab Nebula at 1 TeV with a soft spectrum proportional to E -4.6±0.5. The signal centroid is consistent with the GC direction, and the observed profile is consistent with a pointlike source. Our data suggest that the GeV source 3EG J1746-2851 is identical to this TeV source, and we study the combined spectra to determine the possible origin of the gamma-ray emission. We also obtain an upper limit on the cold dark matter density in the Galactic halo.

AB - We have detected sub-TeV gamma-ray emission from the direction of the Galactic center (GC) using the CANGAROO-II Imaging Atmospheric Cerenkov Telescope. We detected a statistically significant excess at energies greater than 250 GeV. The flux was 1 order of magnitude lower than that of the Crab Nebula at 1 TeV with a soft spectrum proportional to E -4.6±0.5. The signal centroid is consistent with the GC direction, and the observed profile is consistent with a pointlike source. Our data suggest that the GeV source 3EG J1746-2851 is identical to this TeV source, and we study the combined spectra to determine the possible origin of the gamma-ray emission. We also obtain an upper limit on the cold dark matter density in the Galactic halo.

KW - Galaxy: center

KW - Gamma rays: observations

UR - http://www.scopus.com/inward/record.url?scp=2442583383&partnerID=8YFLogxK

U2 - 10.1086/421292

DO - 10.1086/421292

M3 - Article

SN - 0004-637X

VL - 606

SP - L115-L118

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 II

ER -

Detection of sub-TeV gamma rays from the Galactic center direction by CANGAROO-II

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