Two Space High Energy Astrophysics Missions of China: POLAR & HXMT
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1 Two Space High Energy Astrophysics Missions of China: POLAR & HXMT Shuang-Nan Zhang ( 张双南 ) Institute of High Energy Physics National Astronomical Observatories of China Chinese Academy of Sciences 1/22
2 , LIGO team announced the shocking news: The gravitational wave predicted 100 yrs ago has been detected! We did it! Courtesy 2/22
3 A gamma-ray burst with GW150914? 3/22
4 What is a gamma-ray burst? Still not understood well! 4/22
5 However INTEGRAL did not see anything! 5/22
6 Therefore with full and self-consistent general relativity calculation, we find that the in-falling matter will not accumulate outside the event horizon, and thus the quantum radiation and Gamma Ray bursts predicted in [2] and [3] are not likely to be generated. We predict that only gravitational wave radiation can be produced in the final stage of the merging process of two coalescing black holes. Future simultaneous observations by X-ray telescopes and gravitational wave telescopes shall be able to verify our prediction. Physics & National astronomical Liu & Zhang Observatories 2009, of PLB, China, 679, Chinese 88 Academy of Sciences 6/31
7 Gamma-ray burst polarization : POLAR Polarization sensitive to relativistic jet properties China-Europe collaboration Science goal: understanding GRB jet with polarimetry Energy Range:50~500 kev Launch time: /22
8 POLAR is a little bee on TG-2 Two Space High Energy Astrophysics Missions of China: POLAR and HXMT Shuang-Nan Zhang Institute of High Energy 8/22
9 POLAR detected GRBs 9/22
10 POLAR detected solar flares POL AR POLAR US RHESS Satellite 10/22
11 POLAR also detected the Crab pulsar Relative 相对强度 intensity POLAR XAO Fermi /22 0 相位 phase
12 Hard X-ray Modulation Telescope (HXMT) satellite n China s 1 st X-ray astronomy satellite n Selected in 2011 n Total weight ~2500 kg n Cir. Orbit 550 km, incl. 43 n Pointed, scanning and GRB modes n Designed lifetime 4 yrs n Launch in 1 st half of 2017 n Welcome international cooperation, especially radio and optical observations on ground and from the southern hemisphere. 12/22
13 HXMT Payloads Star trackers ME Medium (ME): Si-PIN,5-30 kev, 952 cm 2 High Energy (HE): Normal Mode NaI, kev, ~5000 cm 2 CsI, kev, ~5000 cm 2 LE Low Energy (LE): HE High Energy (HE): GRB Mode NaI, kev, 5000 cm 2 SCD,1-15 kev, 384 cm 2 CsI, kev, 5000 cm 2 13/67
14 HXMT Scientific Objectives Scanning survey of the Milky Way: new sources and activities of known sources A black hole/neutron stars engulfs matter from its companion and generates bright and variable X-rays. ESA s Integral satellite Most bright X-ray sources in the Milky Way are variable: black holes and neutron stars. A rapidly spinning neutron star with the strongest magnetic field in nature generates bright X -rays. 14/22
15 1 st yr observation program: July, 2017 Declination Right Ascension Most HXMT sources are visible from SA, but not from China!
16 HXMT scanning survey of the Milky Way Repeatedly scanning the whole Milky Way, to discover new variable black holes and neutron stars, and monitor activities of the known X-ray sources 16/19
17 The Milky Way is highly variable in X-ray eyes! The Center of the Milky Way viewed by NASA RXTE satellite HXMT scan mode 17/19
18 HXMT s new capability: GRBs HXMT CsI GRB detector The most sensitive in soft gamma-rays (MeV), 10X larger than GBM on-board Fermi satellite. 18/22
19 Comparison of the two GRB detectors HXMT satellite TG-2 POLAR launch Field of View ~2/3 sky ~1/2 sky Energy: kev Location ~10 deg ~5 deg GRB Parameters Energy Spectra Polarization Advantage γ-ray area γ-ray pol. No. of GRBs 200/year 50/year We are very lucky in this exciting era! Unique advantages of HXMT&POLAR in detecting GRBs possibly associated with Gravitational wave bursts! 19/22
20 POLAR&HXMT need helps of MeerKAT&SALT! Many thanks for your attention! 20/22
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