Very high energy gamma-ray observations of the Galactic Plane with the CANGAROO-III telescopes

M. Ohishi; M. Mori; Y. Adachi; A. Asahara; G. V. Bicknell; R. W. Clay; Y. Doi; P. G. Edwards; R. Enomoto; S. Gunji; S. Hara; T. Hara; T. Hattori; Sei Hayashi; Y. Higashi; Y. Hirai; K. Inoue; C. Itoh; S. Kabuki; F. Kajino; H. Katagiri; A. Kawachi; T. Kifune; R. Kiuchi; H. Kubo; T. Kurihara; R. Kurosaka; J. Kushida; Y. Matsubara; Y. Miyashita; T. Mizukami; R. Mizuniwa; H. Muraishi; Y. Muraki; T. Naito; T. Nakamori; S. Nakano; T. Nakase; D. Nishida; K. Nishijima; N. Sakamoto; Y. Sakamoto; M. Sato; A. Seki; V. Stamatescu; T. Suzuki; D. L. Swaby; T. Tanimori; H. Tanimura; G. J. Thornton; F. Tokanai; K. Tsuchiya; S. Watanabe; Y. Yamada; T. Yamaoka; E. Yamazaki; S. Yanagita; T. Yoshida; T. Yoshikoshi; Y. Yukawa

doi:10.1016/j.astropartphys.2008.06.007

Very high energy gamma-ray observations of the Galactic Plane with the CANGAROO-III telescopes

M. Ohishi^*, M. Mori, Y. Adachi, A. Asahara, G. V. Bicknell, R. W. Clay, Y. Doi, P. G. Edwards, R. Enomoto, S. Gunji, S. Hara, T. Hara, T. Hattori, Sei Hayashi, Y. Higashi, Y. Hirai, K. Inoue, C. Itoh, S. Kabuki, F. KajinoH. Katagiri, A. Kawachi, T. Kifune, R. Kiuchi, H. Kubo, T. Kurihara, R. Kurosaka, J. Kushida, Y. Matsubara, Y. Miyashita, T. Mizukami, R. Mizuniwa, H. Muraishi, Y. Muraki, T. Naito, T. Nakamori, S. Nakano, T. Nakase, D. Nishida, K. Nishijima, N. Sakamoto, Y. Sakamoto, M. Sato, A. Seki, V. Stamatescu, T. Suzuki, D. L. Swaby, T. Tanimori, H. Tanimura, G. J. Thornton, F. Tokanai, K. Tsuchiya, S. Watanabe, Y. Yamada, T. Yamaoka, E. Yamazaki, S. Yanagita, T. Yoshida, T. Yoshikoshi, Y. Yukawa

^*Corresponding author for this work

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

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Abstract

In 2004, we searched for very high energy (VHE) gamma-ray emission from the Galactic Plane using the CANGAROO-III stereoscopic observation system. Two different longitude regions (ℓ = -19°.5 and ℓ = +13°.0) on the Galactic Plane were observed during July and August 2004. We analyzed events that triggered three telescopes aiming to measure the diffuse emission component. No significant signal associated with the Galactic Plane was found from either of the regions. Assuming that the gamma-ray spectrum is described by a single power-law for energies ranging between a few GeV and TeV, lower limits of the power-law spectral indices were found to be 2.2 for both of the regions with a 99.9% confidence level. This result is consistent with the other VHE measurements and constrains a hypothesis in which a very hard (∼2.0) cosmic ray electron spectrum was introduced to explain the EGRET GeV anomaly.

Original language	English
Pages (from-to)	47-53
Number of pages	7
Journal	Astroparticle Physics
Volume	30
Issue number	2
DOIs	https://doi.org/10.1016/j.astropartphys.2008.06.007
Publication status	Published - Sept 2008

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10.1016/j.astropartphys.2008.06.007

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Ohishi, M., Mori, M., Adachi, Y., Asahara, A., Bicknell, G. V., Clay, R. W., Doi, Y., Edwards, P. G., Enomoto, R., Gunji, S., Hara, S., Hara, T., Hattori, T., Hayashi, S., Higashi, Y., Hirai, Y., Inoue, K., Itoh, C., Kabuki, S., ... Yukawa, Y. (2008). Very high energy gamma-ray observations of the Galactic Plane with the CANGAROO-III telescopes. Astroparticle Physics, 30(2), 47-53. https://doi.org/10.1016/j.astropartphys.2008.06.007

@article{c3f8913099574784b240b3dbeac8d7fa,

title = "Very high energy gamma-ray observations of the Galactic Plane with the CANGAROO-III telescopes",

abstract = "In 2004, we searched for very high energy (VHE) gamma-ray emission from the Galactic Plane using the CANGAROO-III stereoscopic observation system. Two different longitude regions (ℓ = -19°.5 and ℓ = +13°.0) on the Galactic Plane were observed during July and August 2004. We analyzed events that triggered three telescopes aiming to measure the diffuse emission component. No significant signal associated with the Galactic Plane was found from either of the regions. Assuming that the gamma-ray spectrum is described by a single power-law for energies ranging between a few GeV and TeV, lower limits of the power-law spectral indices were found to be 2.2 for both of the regions with a 99.9% confidence level. This result is consistent with the other VHE measurements and constrains a hypothesis in which a very hard (∼2.0) cosmic ray electron spectrum was introduced to explain the EGRET GeV anomaly.",

keywords = "Gamma-rays: observations, Milky way galaxy",

author = "M. Ohishi and M. Mori and Y. Adachi and A. Asahara and Bicknell, {G. V.} and Clay, {R. W.} and Y. Doi and Edwards, {P. G.} and R. Enomoto and S. Gunji and S. Hara and T. Hara and T. Hattori and Sei Hayashi and Y. Higashi and Y. Hirai and K. Inoue and C. Itoh and S. Kabuki and F. Kajino and H. Katagiri and A. Kawachi and T. Kifune and R. Kiuchi and H. Kubo and T. Kurihara and R. Kurosaka and J. Kushida and Y. Matsubara and Y. Miyashita and T. Mizukami and R. Mizuniwa and H. Muraishi and Y. Muraki and T. Naito and T. Nakamori and S. Nakano and T. Nakase and D. Nishida and K. Nishijima and N. Sakamoto and Y. Sakamoto and M. Sato and A. Seki and V. Stamatescu and T. Suzuki and Swaby, {D. L.} and T. Tanimori and H. Tanimura and Thornton, {G. J.} and F. Tokanai and K. Tsuchiya and S. Watanabe and Y. Yamada and T. Yamaoka and E. Yamazaki and S. Yanagita and T. Yoshida and T. Yoshikoshi and Y. Yukawa",

year = "2008",

month = sep,

doi = "10.1016/j.astropartphys.2008.06.007",

language = "English",

volume = "30",

pages = "47--53",

journal = "Astroparticle Physics",

issn = "0927-6505",

publisher = "Elsevier B.V.",

number = "2",

}

Ohishi, M, Mori, M, Adachi, Y, Asahara, A, Bicknell, GV, Clay, RW, Doi, Y, Edwards, PG, Enomoto, R, Gunji, S, Hara, S, Hara, T, Hattori, T, Hayashi, S, Higashi, Y, Hirai, Y, Inoue, K, Itoh, C, Kabuki, S, Kajino, F, Katagiri, H, Kawachi, A, Kifune, T, Kiuchi, R, Kubo, H, Kurihara, T, Kurosaka, R, Kushida, J, Matsubara, Y, Miyashita, Y, Mizukami, T, Mizuniwa, R, Muraishi, H, Muraki, Y, Naito, T, Nakamori, T, Nakano, S, Nakase, T, Nishida, D, Nishijima, K, Sakamoto, N, Sakamoto, Y, Sato, M, Seki, A, Stamatescu, V, Suzuki, T, Swaby, DL, Tanimori, T, Tanimura, H, Thornton, GJ, Tokanai, F, Tsuchiya, K, Watanabe, S, Yamada, Y, Yamaoka, T, Yamazaki, E, Yanagita, S, Yoshida, T, Yoshikoshi, T & Yukawa, Y 2008, 'Very high energy gamma-ray observations of the Galactic Plane with the CANGAROO-III telescopes', Astroparticle Physics, vol. 30, no. 2, pp. 47-53. https://doi.org/10.1016/j.astropartphys.2008.06.007

TY - JOUR

T1 - Very high energy gamma-ray observations of the Galactic Plane with the CANGAROO-III telescopes

AU - Ohishi, M.

AU - Mori, M.

AU - Adachi, Y.

AU - Asahara, A.

AU - Bicknell, G. V.

AU - Clay, R. W.

AU - Doi, Y.

AU - Edwards, P. G.

AU - Enomoto, R.

AU - Gunji, S.

AU - Hara, S.

AU - Hara, T.

AU - Hattori, T.

AU - Hayashi, Sei

AU - Higashi, Y.

AU - Hirai, Y.

AU - Inoue, K.

AU - Itoh, C.

AU - Kabuki, S.

AU - Kajino, F.

AU - Katagiri, H.

AU - Kawachi, A.

AU - Kifune, T.

AU - Kiuchi, R.

AU - Kubo, H.

AU - Kurihara, T.

AU - Kurosaka, R.

AU - Kushida, J.

AU - Matsubara, Y.

AU - Miyashita, Y.

AU - Mizukami, T.

AU - Mizuniwa, R.

AU - Muraishi, H.

AU - Muraki, Y.

AU - Naito, T.

AU - Nakamori, T.

AU - Nakano, S.

AU - Nakase, T.

AU - Nishida, D.

AU - Nishijima, K.

AU - Sakamoto, N.

AU - Sakamoto, Y.

AU - Sato, M.

AU - Seki, A.

AU - Stamatescu, V.

AU - Suzuki, T.

AU - Swaby, D. L.

AU - Tanimori, T.

AU - Tanimura, H.

AU - Thornton, G. J.

AU - Tokanai, F.

AU - Tsuchiya, K.

AU - Watanabe, S.

AU - Yamada, Y.

AU - Yamaoka, T.

AU - Yamazaki, E.

AU - Yanagita, S.

AU - Yoshida, T.

AU - Yoshikoshi, T.

AU - Yukawa, Y.

PY - 2008/9

Y1 - 2008/9

N2 - In 2004, we searched for very high energy (VHE) gamma-ray emission from the Galactic Plane using the CANGAROO-III stereoscopic observation system. Two different longitude regions (ℓ = -19°.5 and ℓ = +13°.0) on the Galactic Plane were observed during July and August 2004. We analyzed events that triggered three telescopes aiming to measure the diffuse emission component. No significant signal associated with the Galactic Plane was found from either of the regions. Assuming that the gamma-ray spectrum is described by a single power-law for energies ranging between a few GeV and TeV, lower limits of the power-law spectral indices were found to be 2.2 for both of the regions with a 99.9% confidence level. This result is consistent with the other VHE measurements and constrains a hypothesis in which a very hard (∼2.0) cosmic ray electron spectrum was introduced to explain the EGRET GeV anomaly.

AB - In 2004, we searched for very high energy (VHE) gamma-ray emission from the Galactic Plane using the CANGAROO-III stereoscopic observation system. Two different longitude regions (ℓ = -19°.5 and ℓ = +13°.0) on the Galactic Plane were observed during July and August 2004. We analyzed events that triggered three telescopes aiming to measure the diffuse emission component. No significant signal associated with the Galactic Plane was found from either of the regions. Assuming that the gamma-ray spectrum is described by a single power-law for energies ranging between a few GeV and TeV, lower limits of the power-law spectral indices were found to be 2.2 for both of the regions with a 99.9% confidence level. This result is consistent with the other VHE measurements and constrains a hypothesis in which a very hard (∼2.0) cosmic ray electron spectrum was introduced to explain the EGRET GeV anomaly.

KW - Gamma-rays: observations

KW - Milky way galaxy

UR - http://www.scopus.com/inward/record.url?scp=51249111979&partnerID=8YFLogxK

U2 - 10.1016/j.astropartphys.2008.06.007

DO - 10.1016/j.astropartphys.2008.06.007

M3 - Article

SN - 0927-6505

VL - 30

SP - 47

EP - 53

JO - Astroparticle Physics

JF - Astroparticle Physics

IS - 2

ER -

Very high energy gamma-ray observations of the Galactic Plane with the CANGAROO-III telescopes

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