Preprint
Oct 2026
MARTA: A"little"black hole hidden in a clumpy, metal-poor galaxy at z~3.8
JWST has extended the search for accreting black holes into the high-redshift, low-mass regime. We report a low-mass black hole candidate in MARTA 3887, a clumpy, metal-poor galaxy at $z=3.7694$, combining deep JWST/NIRSpec spectroscopy, HST and JWST imaging, and archival VLT/MUSE data. We detect a broad H$\alpha$ comp...
M. Curti, B. Moreschini, E. Cataldi et al.
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