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Aperiodic Timing Analysis of Accreting X-ray Pulsars in Outburst: HMXB vs. LMXB

This study examines the rapid aperiodic timing behavior of 4 accreting X-ray pulsars in outburst, comparing the characteristics of High-Mass X-ray Binaries (HMXB) and Low-Mass X-ray Binaries (LMXB). The analysis focuses on the differences in spectral branches, motion patterns, and power spectral density (PSD) between the two types of systems. The research highlights variations in flux, hardness, and coupling of periodic and aperiodic variability, shedding light on the distinct features of HMXBs and LMXBs. The study reveals notable differences in topology, time scales, and characteristic frequencies, emphasizing the unique behaviors exhibited by these pulsar systems.

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Aperiodic Timing Analysis of Accreting X-ray Pulsars in Outburst: HMXB vs. LMXB

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  1. Are there atoll/Z sources in HMXB?A rapid aperiodic timing analysis of 4 accreting X-ray pulsars in outburstPablo ReigIESL, Foundation for Research & Technology-HELLASAstronomy Group, Physics Dept. University of Crete

  2. Be/X-ray binaries • HMXB • Be + NS • Accreting X-ray pulsars • Mainly transients • Two types of outbursts Type I:Lx < 1037 erg/s, (quasi)periodic Porb, short Type II: Lx ~1037-1038 erg/s, unpredictable, long

  3. van der Klis (2006)‏ CD in LMXBs Atoll sources Z sources

  4. CD in HMXBs • two branches • horizontal at low Lx • diagonal at intermediate & high Lx • HC makes the difference • 4U 0115+63, EXO2030+375 & KS1947+300 • as flux increases SC decreases, HC increases • V 0332+53 • as flux increases SC decreases, HC decreases

  5. ‏

  6. Hardness-Intensity Diagrams

  7. Ll LLF Lb Ll LLF Lu Lb Lu Lb'' Lb' van Straaten et al. (2002)‏ Belloni et al. (2002)‏ PSD in LMXBs Atoll source Z source νmax =(ν02 + Δ2)1/2 Δ=FWHM/2

  8. multi-Lorentzian profile • 4 BLN (Lb, Ll, Lu, Lu’) & 2 PN ≈ QPO (LLF, Ls) • νb < νLF < νl < νu • νs ≈ νspin --> coupling periodic/aperiodic var.

  9. PSD in HMXBs Lb Ll LLF Ls

  10. PSD in HMXBs Lb Ll LLF Ls

  11. PSD in HMXBs Lb Ll Lu Lu'

  12. PSD in HMXBs Lb Ll Lu

  13. HMXB vs LMXB: similarities • two different types • 4U 0115+63, EXO 2030+375, KS1947+300 • V 0332+53 (~ Z)‏ • spectral branches • smooth motion without jumps • horizontal branch • low flux & high rms • PSD: multi-Lorentzian • broad (zero-centred L) noise for low and high frequencies • peaked noise for intermediate frequencies

  14. HMXB vs LMXB: differences • different topology • slower motion along the branches • hr-days in LMXBs, days-weeks in HMXBs • ~ one order of magnitude longer time scales • mHz QPOs, ν ~ 0.001-0.1 Hz typically • Ls noise • associated with the pulse noise • no apparent correlation between spectral parameters (characteristic frequencies, rms) Mdot

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