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Based on data from the SWIFT, INTEGRAL, MAXI/ISS orbital observatories, andthe ground-based RTT-150 telescope, we have investigated the broadband (fromthe optical to the hard X-ray bands) spectrum of the X-ray nova MAXI J1828-249and its evolution during the outburst of the source in 2013-2014. The opticaland infrared emissions from the nova are shown to be largely determined by theextension of the power-law component responsible for the hard X-ray emission.The contribution from the outer cold regions of the accretion disk, even if theX-ray heating of its surface is taken into account, turns out to be moderateduring the source's "high" state (when a soft blackbody emission component isobserved in the X-ray spectrum) and is virtually absent during its "low"("hard") state. This result suggests that much of the optical and infraredemissions from such systems originates in the same region of main energyrelease where their hard X-ray emission is formed. This can be the Compton orsynchro-Compton radiation from a high-temperature plasma in the centralaccretion disk region puffed up by instabilities, the synchrotron radiationfrom a hot corona above the disk, or the synchrotron radiation from itsrelativistic jets.

X-ray nova MAXI J1828-249. Evolution of the broadband spectrum during its 2013-2014 outburst