PDF CANGAROO-II 望遠鏡による 南天のBL Lac天体の観測

CANGAROO-II 望遠鏡による 南天の BL Lac 天体の観測

東海大学理学部：中瀬友和、西嶋恭司、服部敬裕、

他

CANGAROO

チーム

CANGAROO-II Telescope

„ 場所

„

Woomera, SA Australia

南緯 31°06’, 東経 136°47’, 海抜 160 m

„ 主鏡

„

80cm φ球面鏡 114 枚からなる複合放物

面鏡(CFRP )

„ 有効面積

57m

²

„ 焦点距離

8m

„ イメージングカメラ

„ 視野：〜

3 °

„ ピクセルサイズ：

0.115 °× 0.115 °

„ ピクセル数：552

AGN Observations Summary

Target z Year Time(hrs) E(TeV) Telescope

„

PKS0548-322 0.069 '99 16.6 1.0 7

'00 2.6 10

„

PKS2005-489 0.071 '99 26.2 1.1 7

'00 32.6 0.45 10

„

PKS2155-304 0.116 '99 58.5 0.96 7

'00 35.6 0.40 10

„

Mkn421 0.031 '01 14.4 9.3 10 Mkn421

を除き、観測期間中に

X

線領域で

大きなフレアーは報告されていない

PKS2005-489

„

Observation

„ 1999 Aug 26.2 hrs 25.2 hrs 7m

„ 2000 July/Aug(4nights) 21.2 hrs 19.9 hrs 10m campaign:July 28 - Aug.1 with RXTE and others

„ 2000 Aug/Sep(4nights) 11.4 hrs 9.4 hrs 10m campaign:Aug. 25 - Sep. 3 with RXTE and others

„

Used data for image analysis(10m)

„ ON : 140,974 events (live time : 16.9 hours)

„ OFF: 127,862 events (live time : 15.4 hours)

„

Effective area and threshold energy(10m)

„ Average effective area : 4.4×10⁸cm²

„ Threshold energy : 450 GeV

ON OFF     Telescope

10³

Energy⁽GeV)

10⁹cm²

PKS2005-489 (alpha distribution)

1999 2000

preliminary preliminary

PKS2005-489 (Energy Spectrum)

preliminary preliminary

F(>1.1TeV) < 6.6×10^-12cm^-2s^-1 (preliminary) F(>0.45TeV) < 6.4×10^-12cm^-2s^-1 (preliminary)

PKS2005-489

(Multiwavelength Campaign)

July 28 – Aug. 1, 2000 & Aug. 25 – Sep. 3, 2000

CANGAROO-II 10m (E>450GeV)

RXTE PCU0/1 (2-12 keV)

Rector et al.(2001)

CTIO 0.9m (Optical)

PKS2155-304

„

Observation

„ 1999 Sep 33.7 hrs 26.1 hrs 7m

„ 1999 Oct 24.8 hrs 24.8 hrs 7m

„ 2000 Aug/Sep(6nights) 11.6 hrs 10.8 hrs 10m campaign:Aug. 27 – Aug. 31 with RXTE

„ 2000 Sep/Oct(5nights) 24.0 hrs 24.3 hrs 10m

Used data for image analysis(10m)

„ ON : 146,007 events (live time : 17.8 hours)

„ OFF: 118,368 events (live time : 15.2 hours)

Effective area and threshold energy(10m)

„ Average effective area : 3.6×10⁸cm²

„ Threshold energy : 400 GeV

ON OFF  Telescope

10³

Energy⁽GeV)

10⁹cm²

PKS2155-304 (alpha distribution)

1999 2000

preliminary preliminary

PKS2155-304 (Energy Spectrum)

preliminary preliminary

F(>0.96TeV) < 6.9×10^-12cm^-2s^-1 (preliminary) F(>0.40TeV) < 1.2×10^-11cm^-2s^-1 (preliminary)

PKS2155-304 (night by night)

(E>0.40TeV)

Preliminary

Observation in 2000 with CANGAROO-II 10m

PKS0548-322

„ Observation

„

1999 Oct 3.0 hrs 3.8 hrs 7 m

„

1999 Nov 13.6 hrs 13.9 hrs 7 m

„

2000 Dec/2001 Jan 2.6 hrs 1.5 hrs 10 m

„ Results

„ No evidence for gamma-ray steady emission

„ Flux upper limits (2σ)

Š F(>1.5TeV) < 1.0 × 10

^-11

cm

^-2

s

^-1

(preliminary)

1999

preliminary ON OFF   Telescope

Extragalactic Background Lights

Measurements & limits

Limits implied by TeV γ-rays

Hauser & Dwek, Ann.Rev.Astrno.&Astrophys 2001

Optical depth

Spectrum of extragalactic

background light Optical depth

Hauser & Dwek, Ann.Rev.Astrno.&Astrophys 2001 by T.Nakase

Upper limits for intrinsic energy spectrum

Preliminary Preliminary

Summary

CANGAROO-II

望遠鏡で、

1999

年以来南 天の

BL Lac

天体

PKS2005-489, PKS2155- 304

、

PKS0548-322

を観測した。

今のところ、いずれの

BL Lac

天体からも、

静穏期における

TeV

ガンマ線放射の証拠 は得られていない。