Status pulsar studies in soft gamma-rays Lucien Kuiper, Wim Hermsen, [Hans Bloemen]


НазваStatus pulsar studies in soft gamma-rays Lucien Kuiper, Wim Hermsen, [Hans Bloemen]
Дата конвертації06.06.2013
Розмір478 b.
ТипПрезентации


Status pulsar studies in soft gamma-rays

  • Lucien Kuiper, Wim Hermsen, [Hans Bloemen]


I: spin-down powered pulsars a) normal pulsars b) millisec pulsars (old recycled systems)

  • I: spin-down powered pulsars a) normal pulsars b) millisec pulsars (old recycled systems)

  • II: accretion powered pulsars a) LMXB (incl. transient ms-pulsars) b) HMXB (Be-binaries, [sub-]giant binaries) III: magnetically powered pulsars (=magnetars) AXPs/SGRs



Class Ia: Spin-down powered [normal] pulsars

  • CGRO (20 keV-30 GeV) heritage: number of -ray pulsars increased from 2 (Crab, Vela) to 7 (10), all young (≤ 100 ky) and energetic

  • This is the only established Galactic -ray source population, emitting over a wide energy range (0.5 keV – 10 GeV)

  • We still do not know where the -rays are produced in the magnetosphere (outer gap/polar cap) and which physical processes are acting (synchrotron, curvature radiation, inverse Compton, photon splitting, …)







Promising recent progress (Chandra/XMM/RXTE/INTEGRAL)

  • Promising recent progress (Chandra/XMM/RXTE/INTEGRAL)

  • Deep searches at the cores of SN-remnants and in the error boxes of unidentified EGRET sources yielded detections of several radio dim/quiet energetic pulsars emitting hard X-rays (> 10 keV)







Class Ib: Spin-down powered millisec pulsars





  • Status before early 2004:

  • - Not rotation powered pulsars (LX >> Lsd)

  • - Not accretion powered pulsars [i.e. not X-ray pulsars in LMXBs/HMXBs] (steady spin-down; no apparent optical counterpart; no periodic Doppler delay in X-ray timing)

  • - Characteristics:

    • Pulse periods 5 -12 s
    • “Steady” spin-down like rotation powered pulsars (incl. glitches)
    • X-ray luminosities 1034-36 erg/s (steady, but outbursts; transient AXPs)
    • [Very] soft X-ray (0.5-10 keV) spectra: BB (0.35–0.6 keV) and PL (2–4)
    • Similar to SGRs (glitches; (out)bursts), suggesting magnetars (NSs with B ~ 1014-15 G powered by decay of the B-field)
    • Young population concentrated along Galactic plane, some in SNRs






AXP 1E 1841-045 (+ Kes 73) (Kuiper, Hermsen & Mendez, 2004, ApJ 613, 1173)





AXP 1E2259+586 (+ CTB 109)



Summary



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