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astro-ph.HE2025
Euclid Quick Data Release (Q1). The active galaxies of Euclid
Euclid Collaboration, T. Matamoro Zatarain, S. Fotopoulou +355
We present a catalogue of candidate active galactic nuclei (AGN) in the Quick Release (Q1) fields. For each source we collect multi-wavelength photometry and spec…
astro-ph.HE2024
Multi-wavelength spectroscopic analysis of the ULX Holmberg II X-1 and its nebula suggests the presence of a heavy black hole accreting from a B-type donor
S. Reyero Serantes, L. Oskinova, W. -R. Hamann +11
Ultra-luminous X-ray sources (ULXs) are high-mass X-ray binaries with an X-ray luminosity above erg s. These ULXs can be powered by black holes that are more massi…