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Faint Infrared Flares from the Microquasar GRS 1915+105.

Eikenberry, Matthews, Muno

    The Astrophysical Journal
    |March 4, 2000
    PubMed
    Summary

    Simultaneous infrared and X-ray observations revealed faint infrared flares preceding X-ray oscillations in the microquasar GRS 1915+105, suggesting an "outside-in" origin for these cycles.

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    Area of Science:

    • Astrophysics
    • High-energy astrophysics
    • Galactic astronomy

    Background:

    • Microquasars are stellar-mass black hole systems that exhibit accretion disk and relativistic jet phenomena.
    • GRS 1915+105 is a well-studied Galactic microquasar known for its complex variability across multiple wavelengths.

    Purpose of the Study:

    • To investigate the temporal relationship between infrared (IR) and X-ray emissions in the microquasar GRS 1915+105.
    • To understand the origin of IR/X-ray cycles and their implications for jet formation.

    Main Methods:

    • Simultaneous observations using the Palomar 5 m telescope (infrared) and Rossi X-Ray Timing Explorer (X-ray).
    • Analysis of light curves during a 5-hour observation period on 1998 July 10 UT.
    • Correlation analysis between infrared flares and X-ray soft-dip/soft-flare cycles.

    Main Results:

    • Observed six faint infrared flares (0.3-0.6 mJy, 500-600 s duration) associated with X-ray soft-dip/soft-flare cycles.
    • Infrared flares initiated prior to X-ray oscillations, indicating an "outside-in" origin for the observed cycles.
    • Quasi-steady infrared excess in previous observations attributed to the cumulative effect of these faint flares.

    Conclusions:

    • The observed flaring behavior provides insights into the accretion and jet launching mechanisms in microquasars.
    • The
    • outside-in
    • model suggests that processes occurring further from the central engine may drive the observed variability.

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