Bibcode
Baglio, M. C.; Russell, David M.; Casella, Piergiorgio; Noori, Hind Al; Yazeedi, Aisha Al; Belloni, Tomaso; Buckley, David A. H.; Cadolle Bel, Marion; Ceccobello, Chiara; Corbel, Stephane; Coti Zelati, Francesco; Díaz Trigo, Maria; Fender, Rob P.; Gallo, Elena; Gandhi, Poshak; Homan, Jeroen; Koljonen, Karri I. I.; Lewis, Fraser; Maccarone, Thomas J.; Malzac, Julien; Markoff, Sera; Miller-Jones, James C. A.; O’Brien, Kieran; Russell, Thomas D.; Saikia, Payaswini; Shahbaz, T.; Sivakoff, Greg R.; Soria, Roberto; Testa, Vincenzo; Tetarenko, Alexandra J.; van den Ancker, Mario E.; Vincentelli, Federico M.
Referencia bibliográfica
The Astrophysical Journal, Volume 867, Issue 2, article id. 114, 15 pp. (2018).
Fecha de publicación:
11
2018
Revista
Número de citas
25
Número de citas referidas
23
Descripción
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.
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