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SECCO1 is an extremely dark, low-mass (M_star=10^5 M_sun), star-formingstellar system lying in the Low Velocity Cloud (LVC) substructure of the Virgocluster of galaxies, and hosting several HII regions. Here we review ourknowledge of this remarkable system, and present the results of (a) additionalanalysis of our panoramic spectroscopic observations with MUSE, (b) thecombined analysis of Hubble Space Telescope and MUSE data, and (c) newnarrow-band observations obtained with OSIRIS@GTC to search for additional HIIregions in the surroundings of the system. We provide new evidence supportingan age as young as 4 Myr for the stars that are currently ionising the gas inSECCO1. We identify only one new promising candidate HII region possiblyassociated with SECCO1, thus confirming the extreme isolation of the system. Wealso identify three additional candidate pressure-supported dark clouds inVirgo among the targets of the SECCO survey. Various possible hypotheses forthe nature and origin of SECCO1 are considered and discussed, also with thehelp of dedicated hydrodynamical simulations showing that a hydrogen cloud withthe characteristics of SECCO1 can likely survive for >1 Gyr while travelingwithin the LVC Intra Cluster Medium.

Alone on a wide wide sea. The origin of SECCO 1, an isolated star-forming gas cloud in the Virgo cluster