<i>NuSTAR</i> monitoring of MAXI J1348?630: evidence of high density disc reflection

ABSTRACT We present the broad-band spectral analysis of all six hard, intermediate, and soft state NuSTAR observations recently discovered transient black hole X-ray binary MAXI J1348?630 during its first outburst in 2019. model data with a combination multicolour disc relativistic blurred reflection, and, whenever needed, distant reflection. find that this simple scheme is inadequate explaining spectra, resulting very high iron abundance. therefore explore possibility reflection from high-density disc. use two different sets models to describe reflection: relxill-based models, reflionx-based ones. The bring down abundance around solar value, while density found be $10^{20.3-21.4}\, \rm cm^{-3}$. also evidence high-velocity outflow form ?7.3 keV absorption lines. consistency between best-fitting parameters for epochs statistical significance corresponding indicates existence J1348?630.