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Related Experiment Videos

X-Rays from the Highly Polarized Broad Absorption Line QSO CSO 755.

Brandt, Comastri, Gallagher

    The Astrophysical Journal
    |October 20, 1999
    PubMed
    Summary

    We detected the broad absorption line quasar CSO 755 in X-rays, finding it is the most luminous and highest redshift BAL QSO observed. This X-ray detection supports the idea that highly polarized BAL quasars are brighter in X-rays.

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    Area of Science:

    • Astronomy and Astrophysics
    • High-Energy Astrophysics
    • Quasar Research

    Background:

    • Broad Absorption Line (BAL) quasars are a subset of active galactic nuclei.
    • Investigating X-ray properties of BAL quasars, particularly those with high optical polarization, is crucial for understanding their emission mechanisms.

    Purpose of the Study:

    • To present X-ray observation results of the BAL quasar CSO 755 using BeppoSAX.
    • To investigate the relationship between optical polarization and X-ray brightness in BAL quasars.

    Main Methods:

    • Conducted a BeppoSAX observation of the BAL quasar CSO 755.
    • Analyzed X-ray data from Medium-Energy Concentrator Spectrometers.
    • Examined X-ray spectral shape and flux, including detection in the 21-39 keV band.

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    Main Results:

    • CSO 755 was clearly detected in X-rays, establishing it as the highest redshift (z=2.88) and most optically luminous (MV=-27.4) BAL quasar observed in X-rays.
    • The X-ray detection is consistent with the hypothesis that BAL quasars with high optical polarization are X-ray brighter.
    • Observed-frame 2-10 keV flux is sufficient for further spectroscopic studies, such as X-Ray Multimirror Mission observations.

    Conclusions:

    • The X-ray properties of CSO 755 align with theories linking optical polarization to X-ray luminosity in BAL quasars.
    • Further investigation, including studies of iron K-line emission, is needed to confirm scattering interpretations of the polarization-X-ray flux connection.