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High synchrotron peak (HSP; $\nu_{sy}^{pk} > 10^{15}$ Hz) BL Lacs are some ofthe most extreme accelerators in the Universe. Those found at high redshifts($z>1$) challenge our understanding of blazar evolution models and are crucialfor cosmological measurements of the Extragalactic Background Light. In thispaper, we study a high-$z$ BL Lac, 4FGL J2146.5-1344, detected to be at$z$=1.34 using the photometric dropout technique. We collected multi-wavelengthdata for this source from optical up to $\gamma$-rays, in order to study itsspectral energy distribution (SED). In particular, this source was observed forthe first time with NuSTAR, which accurately measures the synchrotron emissionof this blazar up to 50 keV. Despite being classified as an HSP BL Lac object,the modeling of the SED reveals that this source likely belongs to the"masquerading BL Lac" class, which comprises of FSRQs appearing as disguised BLLac objects.

NuSTAR Observations and multi-wavelength modeling of the high-redshift BL Lac Object 4FGL J2146.5-1344