NuStar: 1st focussing hard x-ray Telescope Victoria Kaspi, McGill University Why Hard x-rays?


НазваNuStar: 1st focussing hard x-ray Telescope Victoria Kaspi, McGill University Why Hard x-rays?
Дата конвертації26.04.2013
Розмір445 b.
ТипПрезентации


NuSTAR: 1st focussing hard X-ray Telescope

Victoria Kaspi, McGill University

Why Hard X-rays?

  • Relatively unexplored region of spectrum

  • Unaffected by photoelectric absorption, either in Galaxy or intrinsic

  • Studies of non-thermal emission above where thermal X-rays ‘contaminate’

  • Radioactive decay lines (e.g. 44Ti)





NASA’s NuSTAR

  • First focusing hard X-ray telescope

  • NASA SMEX $165M

  • Wolter-1 optics coated with multilayers

  • 10 m focal length

  • CdZnTe detectors

  • Time resolution ~2 us

  • Energy range 5-80 keV

  • Spectral resolution 1@60keV

  • 8’ FoV; ~10” FWHM



NuSTAR Sensitivity





NuSTAR Launch June 13, 2012

NuSTAR DEPLOYS in Space

NuSTAR First Light: Cyg X-1



NuSTAR: PI F. Harrison (Caltech)



NuSTAR Calibration Results So Far:

  • Spectral resolution better than requirement

  • In-orbit mast motion consistent with predictions

  • Background stable, within pre-launch predictions

  • Low-E (5-20 keV) calibration agrees with Swift at <3% level

    • High-E calibration presently under study but no major surprises


NuSTAR Science Working Groups



NuSTAR Science Working Groups



NuSTAR Magnetar/Rotation-Powered Pulsars Observing Plan

  • Magnetar/RPP WG:

    • Chair: VMK; Members: H. An (McGill), E. Bellm (Caltech), D. Chakarabarty (MIT), F. Dufour (McGill), E. Gotthelf (Columbia), T. Kitaguchi (Caltech), C. Kouveliotou (NASA/MSFC), K. Mori (Columbia), M. Pivovaroff (LLNL), J. Vogel (LLNL), Collaborator A. Beloborodov (Columbia)
  • 1.2 Ms allocation for WG over 2-yr baseline mission



Summary of A Targets: 1.2 Ms

  • Magnetar Target-of-Opportunity, 150 ks

  • Magnetar 1E 2259+586, 170 ks

  • Magnetar 1E 1048-5937, 400 ks

  • AE Aquarii, 80 ks

  • Rotation-Powered Pulsar Geminga, 260 ks

  • Binary RPP PSR J1023+0038, 100ks

  • Magnetar 1E 1841-045, 45 ks



Magnetars’ Surprising Hard X-ray Turnover

  • Some are hardest known sources above 10 keV!

  • Some have more energy output in hard X-rays than in soft!

  • Unpredicted, not understood

  • Beloborodov (2012)





1E 2259+586: 170 ks

  • Previously hard X-ray detected but in pulsed emission only

  • Key data point in putative correlation between spectral turnover and spin-down rate



Summary of A Targets: 1.2 Ms

  • Magnetar Target-of-Opportunity, 150 ks

  • Magnetar 1E 2259+586, 170 ks

  • Magnetar 1E 1048-5937, 400 ks

  • AE Aquarii, 80 ks

  • Rotation-Powered Pulsar Geminga, 260 ks

  • Binary RPP PSR J1023+0038, 100ks

  • Magnetar 1E 1841-045, 45 ks



AE Aquarii: 80 ks

  • Intermediate polar with possible pulsar-like non-thermal X-ray emission as seen by Suzaku (Terada et al. 2008)

  • P=33s; possible peak seen in hard X-rays

  • Could be accelerating particles in magnetosphere as in radio pulsars?



Geminga: 260 ks

  • Among brightest gamma-ray sources in the sky

  • Soft X-ray spectrum thermal

  • How spectrum turns up not well understood; true for many new Fermi pulsars

  • “gap” at hard X-rays: NuSTAR can fill it in



PSR J1023+0038: 100 ks

  • 1.7 ms radio pulsar in 0.2-day orbit

  • Previous had accretion disk

  • qLMXB/RPP transition object – “missing link” (Archibald et al. 2009)

  • Hard PL X-rays modulated at orbital period

  • Template for understanding emission in qLMXBs; thought to be from hidden RPP in those systems



NuSTAR SNR/PWN Observing Plan

  • SNR/PWN WG: Chair F. Harrison

  • 1.5 Ms allocation for WG over 2-yr baseline mission

  • Pre-approved SN 1987A, Cas A, Crab, G21.5-0.9

  • Probably G1.9+0.3, SN1006 limb



NuSTAR Galactic Binaries Observing Plan

  • Galactic Binaries WG: Chair J. Tomsick (UCB)

  • 0.5 Ms allocation for 2-yr baseline mission

  • Pre-approved Cen X-4, Her X-1, Cyg X-1, BH ToO

  • Vela X-1, 4U 1820-30, V404 Cyg, IGR J16318-4848, IGR J17544-2619, SAX J1808.4-3658, 1FGL J1018.6-5856



Summary

  • NuSTAR launched, appears to be in great shape!

  • Still working on calibration

    • Science observations just beginning
  • Exciting neutron star program planned

    • Magnetars, rotation-powered pulsars, binaries, and more
  • Stay tuned!



In-flight Spectral Resolution



Measured Background



Comparison to Swift





Commissioning Team PI Fiona Harrison, Caltech

  • Hongjun An (McGill)

  • Matteo Bachetti (IRAP)

  • Eric Bellm (CIT)

  • Mislav Bolokovik (CIT)

  • Rick Cook (CIT)

  • Bill Craig (UCB/LLNL)

  • Andrew Davis (CIT)

  • Karl Forster (CIT)

  • Felix Fuerst (CIT)

  • Brian Grefenstette (CIT)

  • Ting-Ni Lu (NTHU)

  • Kristin Madsen (CIT)

  • Peter Mao (CIT)

  • Hiromasa Miyasaka (CIT)

  • Matteo Perri (ASDC)

  • Simonetta Puccetti (ASDC)

  • Vikram Rana (CIT)

  • Dominic Walton (CIT)

  • Niels Joern Westergaard (DTU)

  • Andreas Zoglauer (UCB)



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