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Science results
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N. Produit INTEGRAL science results 2 INTEGRAL is on a 3-days orbit with apogee at 150 000 km and perigee at 10 000 km. Maximizes time outside the electron belts
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N. Produit INTEGRAL science results 3 The instruments The spectrometer SPI (Ge) - 20 keV -> 8 MeV (1keV) - field of view: 16 degrees - angular resolution: 2 degrees The optical camera OMC - field of view: 5 degrees - resolution: 17.6 arcsec - up to 19.7 mag The X-ray imager JEM-X - 3 -> 35 keV - angular resolution: 1 arcmin - FCFOV 4.8(dia) degrees The imager IBIS (CdTe, CsI) - 15 keV -> 10 MeV (10keV) - resolution: 12 arcmin - FCFOV 9X9 degrees Technique of coded mask for IBIS, SPI and JEM-X
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Exposure Map up to February 2006 maximum 10 7 sec N. Produit
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Science with INTEGRAL Emission processes: ● Matter anti-matter annihilation ● Matter matter collision ● Black body radiation (surface of neutron stars) ● Bremsstrahlung (clusters of galaxies also a deep gravitational well) ● Synchrotron radiation (relativistic electrons in B-field) ● Compton processes (electron-photon diffusion) with either thermal electrons or relativistic electrons ● Relativstic jets that boost either process ● Nuclear line emission N. Produit
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The variable γ ray sky N. Produit
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7 “MAGNETAR, B ~ 10 15 G Neutron star, Field re-arrangement INTEGRAL SPI/ACS von Kienlin et al. N. Produit
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8 micro-quasar GRS 1915+105 D. Hannikainen et al. New type of variability N. Produit
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9 20-60keV variability map Neronov et al. Variability of galactic center less than 8% Extended emission N. Produit
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10 Galactic center Revnivtsev et al. 2004, A&A 425, L49 ) 16-60keV ISGRI data Fe contours ASCA overplot N. Produit
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● INTEGRAL: PL ~ 1.8, no cut-off << 100 keV: → Initial SgrA* spectrum similar to low luminosity AGN’s 6.4 keV line is stable over ~ 10 y Compton continuum Fluorescence cut-off (Compton recoil of h.e. γ’s) Scattered radiation N H : 8x10 22 cm -2, Fe-abundance: 1.9 (x solar) M SgrB2 : 2x10 6 M (r/10 pc) 2 Close stellar XRB transients inside cloud (~30 ly across) ruled out. Illuminating source: Sgr A*, ± 1700 A.D. Past luminosity (2-200 keV) ~ 10 39 erg/s (10 4 of today’s value)
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12 IGR J00291+5934 Shaw, Eckert et al. 2005 INTEGRAL ISGRI 20-60keV Fastest accreting msec pulsar, discovered December 2 2004 N. Produit Radio Pulsars Millisecond Radio Pulsars Spin up by mass accretion
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13 GX5-1, Neutron star binary system A. Paizis et al. Accretion disk and a Compton component, hard tails are not a signature of the presence of black holes. N. Produit
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Bright unidentified sources Many unidentified sources should be HMXB Over-density in the (inner) Norma arm region High HMXB density Low HMXB density Walter et al 2005 Lutovinov et al 2005 New : -0.9 HMXB : -0.6 HMXB+new: -0.6 HMXB (XTE): -0.6 ±0.1 N. Produit14
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15 Electron-positron annihilation, SPI map There are 10 43 annihilation per second. Spectrum suggests annihilation in warm medium (7000K) Churasov et al. MNRAS 357, 1377, 2005 N. Produit
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Big Bang Hydrogène + Helium Fe 60:~ 2 000 000 years Al 26 :~ 1 000 000 years Ti 44:~ 90 years Na 22:~ 4 years Co 56, 57:~ 100, 400 days Ni 56, 57:~ 8, 2 days Nucleosynthesis Some of the stellar nucleo synthesis products are observable Stars 16N. Produit
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17 Diehl et al. Nature 2006 26 Al emission associated with disk population N. Produit
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Quasar 3C 273 18 Courvoisier et al., 2003, A&A 411, L343 GRS 1227+025 not observed N. Produit
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19 GAMMA Ray bursts: 1 per month in the IBIS Field of view. Localisation to 2-4 arcminutes. N. Produit
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20 Burst positions are sent automatically to the community by the IBAS system (Mereghetti et al.,2003, A&A 411, L291 Burst light curve and trigger history: N. Produit
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Earth observation N. Produit
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As conclusion INTEGRAL is already in an extended mission phase A further extension until 2008 has been accepted by ESA AO4 is open you can submit observation requests! N. Produit
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