Abstract The detection of dark matter subhalos without a stellar component in the Galactic halo remains challenge. We use supervised machine learning to identify high-latitude gamma-ray sources with matter-like spectra among unassociated 4FGL-DR2. Out 843 4FGL-DR2 at | b ≥ 10°, we select 73 subhalo candidates. Of 69 covered by Neil Gehrels Swift Observatory (Swift) , 17 show least one X-ray sou...

We present the AGN catalog and optical spectroscopy for second data release of Swift BAT Spectroscopic Survey (BASS DR2). With this DR2 we provide 1425 spectra, which 1181 are released first time, 858 hard X-ray selected in 70-month sample. The majority spectra (813/1425, 57%) newly obtained from VLT/Xshooter or Palomar/Doublespec. Many have both higher resolution (R>2500, N~450) and/or very wi...