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    New ALMA and Fermi/LAT Observations of the Large-scale Jet of PKS 0637−752 Strengthen the Case Against the IC/CMB Model

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    https://iopscience.iop.org/article/10.3847/2041-8213/835/2/L35
    Permanent Link
    10.3847/2041-8213/835/2/l35
    http://hdl.handle.net/11603/19491
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    • UMBC Faculty Collection
    • UMBC Joint Center for Earth Systems Technology (JCET)
    • UMBC Physics Department
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    Author/Creator
    Meyer, Eileen T.
    Breiding, Peter
    Georganopoulos, Markos
    Oteo, Iván
    Zwaan, Martin A.
    Laing, Robert
    Godfrey, Leith
    Ivison, R. J.
    Date
    2017-02-02
    Type of Work
    8 pages
    Text
    journal articles preprints
    Citation of Original Publication
    Eileen T. Meyer et al., New ALMA and Fermi/LAT Observations of the Large-scale Jet of PKS 0637−752 Strengthen the Case Against the IC/CMB Model, The Astrophysical Journal Letters, Volume 835, Number 2, doi : 10.3847/2041-8213/835/2/l35
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    This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
    © 2017. The American Astronomical Society. All rights reserved.
    Abstract
    The Chandra X-ray observatory has discovered several dozen anomalously X-ray-bright jets associated with powerful quasars. A popular explanation for the X-ray flux from the knots in these jets is that relativistic synchrotron-emitting electrons inverse-Compton scatter cosmic microwave background (CMB) photons to X-ray energies (the IC/CMB model). This model predicts a high gamma-ray flux that should be detectable by the Fermi/Large Area Telescope (LAT) for many sources. GeV-band upper limits from Fermi/LAT for the well-known anomalous X-ray jet in PKS 0637−752 were previously shown in Meyer et al. to violate the predictions of the IC/CMB model. Previously, measurements of the jet synchrotron spectrum, important for accurately predicting the gamma-ray flux level, were lacking between radio and infrared wavelengths. Here, we present new Atacama Large Millimeter/submillimeter Array (ALMA) observations of the large-scale jet at 100, 233, and 319 GHz, which further constrain the synchrotron spectrum, supporting the previously published empirical model. We also present updated limits from the Fermi/LAT using the new "Pass 8" calibration and approximately 30% more time on source. With these deeper limits, we rule out the IC/CMB model at the 8.7σ level. Finally, we demonstrate that complete knowledge of the synchrotron SED is critical in evaluating the IC/CMB model.


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    Albin O. Kuhn Library & Gallery
    University of Maryland, Baltimore County
    1000 Hilltop Circle
    Baltimore, MD 21250
    www.umbc.edu/scholarworks

    Contact information:
    Email: scholarworks-group@umbc.edu
    Phone: 410-455-3021


    If you wish to submit a copyright complaint or withdrawal request, please email mdsoar-help@umd.edu.