CANGAROO-III observations of the 2006 outburst of PKS 2155-304

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

doi:10.1086/528369

CANGAROO-III observations of the 2006 outburst of PKS 2155-304

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

^*Corresponding author for this work

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Abstract

We have used the CANGAROO-III imaging atmospheric Cerenkov telescopes to observe the high-frequency-peaked BL Lacertae (HBL) object PKS 2155-304 between 2006 July 28 (MJD 53,944) and August 2, triggered by the H.E.S.S. report that the source was in a high state of TeV gamma-ray emission. A signal was detected at the 4.8 σ level in an effective live time of 25.1 hr during the outburst period. The flux of very high energy gamma rays from the CANGAROO-III observations shows variability on the timescale of less than a few hours. The averaged integral flux above 660 GeV is (1.6 ± 0.3_stat ± 0.5_syst) × 10^-11 cm^-2 s ^-1, which corresponds to ∼45% of the flux observed from the Crab Nebula. Follow-up observations between August 17 (MJD 53,964) and 25 indicate that the source activity had decreased.

Original language	English
Pages (from-to)	113-120
Number of pages	8
Journal	Astrophysical Journal
Volume	676
Issue number	1
DOIs	https://doi.org/10.1086/528369
Publication status	Published - 20 Mar 2008

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Sakamoto, Y., Nishijima, K., Mizukami, T., Yamazaki, E., Kushida, J., Enomoto, R., Ohishi, M., Bicknell, G. V., Clay, R. W., Edwards, P. G., Gunji, S., Hara, S., Hattori, T., Hayashi, S., Higashi, Y., Hirai, Y., Inoue, K., Itoh, C., Kabuki, S., ... Yukawa, Y. (2008). CANGAROO-III observations of the 2006 outburst of PKS 2155-304. Astrophysical Journal, 676(1), 113-120. https://doi.org/10.1086/528369

@article{2953b19a3ffc41f783552443b9616c23,

title = "CANGAROO-III observations of the 2006 outburst of PKS 2155-304",

abstract = "We have used the CANGAROO-III imaging atmospheric Cerenkov telescopes to observe the high-frequency-peaked BL Lacertae (HBL) object PKS 2155-304 between 2006 July 28 (MJD 53,944) and August 2, triggered by the H.E.S.S. report that the source was in a high state of TeV gamma-ray emission. A signal was detected at the 4.8 σ level in an effective live time of 25.1 hr during the outburst period. The flux of very high energy gamma rays from the CANGAROO-III observations shows variability on the timescale of less than a few hours. The averaged integral flux above 660 GeV is (1.6 ± 0.3stat ± 0.5syst) × 10-11 cm-2 s -1, which corresponds to ∼45% of the flux observed from the Crab Nebula. Follow-up observations between August 17 (MJD 53,964) and 25 indicate that the source activity had decreased.",

keywords = "BL Lacertae objects: individual (PKS 2155-304), Galaxies: active, Gamma rays: observations",

author = "Y. Sakamoto and K. Nishijima and T. Mizukami and E. Yamazaki and J. Kushida and R. Enomoto and M. Ohishi and Bicknell, {G. V.} and Clay, {R. W.} and Edwards, {P. G.} and S. Gunji and S. Hara and T. Hattori and S. 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 R. Mizuniwa and M. Mori and H. Muraishi and T. Naito and T. Nakamori and S. Nakano and D. Nishida and A. Seki and V. Stamatescu and T. Suzuki and Swaby, {D. L.} and T. Tanimori and G. Thornton and F. Tokanai and K. Tsuchiya and S. Watanabe and Y. Yamada and S. Yanagita and T. Yoshida and T. Yoshikoshi and Y. Yukawa",

year = "2008",

month = mar,

day = "20",

doi = "10.1086/528369",

language = "English",

volume = "676",

pages = "113--120",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Sakamoto, Y, Nishijima, K, Mizukami, T, Yamazaki, E, Kushida, J, Enomoto, R, Ohishi, M, Bicknell, GV, Clay, RW, Edwards, PG, Gunji, S, Hara, S, 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, Mizuniwa, R, Mori, M, Muraishi, H, Naito, T, Nakamori, T, Nakano, S, Nishida, D, Seki, A, Stamatescu, V, Suzuki, T, Swaby, DL, Tanimori, T, Thornton, G, Tokanai, F, Tsuchiya, K, Watanabe, S, Yamada, Y, Yanagita, S, Yoshida, T, Yoshikoshi, T & Yukawa, Y 2008, 'CANGAROO-III observations of the 2006 outburst of PKS 2155-304', Astrophysical Journal, vol. 676, no. 1, pp. 113-120. https://doi.org/10.1086/528369

TY - JOUR

T1 - CANGAROO-III observations of the 2006 outburst of PKS 2155-304

AU - Sakamoto, Y.

AU - Nishijima, K.

AU - Mizukami, T.

AU - Yamazaki, E.

AU - Kushida, J.

AU - Enomoto, R.

AU - Ohishi, M.

AU - Bicknell, G. V.

AU - Clay, R. W.

AU - Edwards, P. G.

AU - Gunji, S.

AU - Hara, S.

AU - Hattori, T.

AU - Hayashi, S.

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 - Mizuniwa, R.

AU - Mori, M.

AU - Muraishi, H.

AU - Naito, T.

AU - Nakamori, T.

AU - Nakano, S.

AU - Nishida, D.

AU - Seki, A.

AU - Stamatescu, V.

AU - Suzuki, T.

AU - Swaby, D. L.

AU - Tanimori, T.

AU - Thornton, G.

AU - Tokanai, F.

AU - Tsuchiya, K.

AU - Watanabe, S.

AU - Yamada, Y.

AU - Yanagita, S.

AU - Yoshida, T.

AU - Yoshikoshi, T.

AU - Yukawa, Y.

PY - 2008/3/20

Y1 - 2008/3/20

N2 - We have used the CANGAROO-III imaging atmospheric Cerenkov telescopes to observe the high-frequency-peaked BL Lacertae (HBL) object PKS 2155-304 between 2006 July 28 (MJD 53,944) and August 2, triggered by the H.E.S.S. report that the source was in a high state of TeV gamma-ray emission. A signal was detected at the 4.8 σ level in an effective live time of 25.1 hr during the outburst period. The flux of very high energy gamma rays from the CANGAROO-III observations shows variability on the timescale of less than a few hours. The averaged integral flux above 660 GeV is (1.6 ± 0.3stat ± 0.5syst) × 10-11 cm-2 s -1, which corresponds to ∼45% of the flux observed from the Crab Nebula. Follow-up observations between August 17 (MJD 53,964) and 25 indicate that the source activity had decreased.

AB - We have used the CANGAROO-III imaging atmospheric Cerenkov telescopes to observe the high-frequency-peaked BL Lacertae (HBL) object PKS 2155-304 between 2006 July 28 (MJD 53,944) and August 2, triggered by the H.E.S.S. report that the source was in a high state of TeV gamma-ray emission. A signal was detected at the 4.8 σ level in an effective live time of 25.1 hr during the outburst period. The flux of very high energy gamma rays from the CANGAROO-III observations shows variability on the timescale of less than a few hours. The averaged integral flux above 660 GeV is (1.6 ± 0.3stat ± 0.5syst) × 10-11 cm-2 s -1, which corresponds to ∼45% of the flux observed from the Crab Nebula. Follow-up observations between August 17 (MJD 53,964) and 25 indicate that the source activity had decreased.

KW - BL Lacertae objects: individual (PKS 2155-304)

KW - Galaxies: active

KW - Gamma rays: observations

UR - http://www.scopus.com/inward/record.url?scp=42149084372&partnerID=8YFLogxK

U2 - 10.1086/528369

DO - 10.1086/528369

M3 - Article

SN - 0004-637X

VL - 676

SP - 113

EP - 120

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

CANGAROO-III observations of the 2006 outburst of PKS 2155-304

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