A Wildly Flickering Jet in the Black Hole X-Ray Binary MAXI J1535-571

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Astrophysical Journal, Volume 867, issue 2
We report on the results of optical, near-infrared (NIR), and mid-infrared observations of the black hole X-ray binary candidate (BHB) MAXI J1535-571 during its 2017/2018 outburst. During the first part of the outburst (MJD 58004-58012), the source shows an optical-NIR spectrum that is consistent with an optically thin synchrotron power law from a jet. After MJD 58015, however, the source faded considerably, the drop in flux being much more evident at lower frequencies. Before the fading, we measure a dereddened flux density of 100 mJy in the mid-infrared, making MAXI J1535-571 one of the brightest mid-infrared BHBs known so far. A significant softening of the X-ray spectrum is evident contemporaneous with the infrared fade. We interpret it as being due to the suppression of the jet emission, similar to the accretion-ejection coupling seen in other BHBs. However, MAXI J1535-571 did not transition smoothly to the soft state, instead showing X-ray hardness deviations associated with infrared flaring. We also present the first mid-IR variability study of a BHB on minute timescales, with a fractional rms variability of the light curves of ∼15%-22%, which is similar to that expected from the internal shock jet model, and much higher than the optical fractional rms (≲7%). These results represent an excellent case of multiwavelength jet spectral timing and demonstrate how rich, multiwavelength time-resolved data of X-ray binaries over accretion state transitions can help in refining models of the disk-jet connection and jet launching in these systems.
accretion, accretion disks, black hole physics, ISM: jets and outflows, X-rays: binaries
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Cristina Baglio , M , Russell , D M , Casella , P , Al Noori , H , Al Yazeedi , A , Belloni , T , Buckley , D A H , Cadolle Bel , M , Ceccobello , C , Corbel , S , Coti Zelati , F , Díaz Trigo , M , Fender , R P , Gallo , E , Gandhi , P , Homan , J , Koljonen , K I I , Lewis , F , Maccarone , T J , Malzac , J , Markoff , S , Miller-Jones , J C A , O'Brien , K , Russell , T D , Saikia , P , Shahbaz , T , Sivakoff , G R , Soria , R , Testa , V , Tetarenko , A J , Van Den Ancker , M E & Vincentelli , F M 2018 , ' A Wildly Flickering Jet in the Black Hole X-Ray Binary MAXI J1535-571 ' , The Astrophysical Journal , vol. 867 , no. 2 , 114 . https://doi.org/10.3847/1538-4357/aae532