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

Bellazzini, M., Armillotta, L., Perina, S., Magrini, L., Cresci, G., Beccari, G., et al. (2018). Alone on a wide wide sea. The origin of SECCO 1, an isolated star-forming gas cloud in the Virgo cluster*†‡. Monthly Notices of the Royal Astronomical Society, 476, 4565-4583.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CF00-2 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CF01-1
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018MNRAS.476.4565B (Any fulltext)
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 Creators:
Bellazzini, M.1, Author
Armillotta, L.1, Author
Perina, S.1, Author
Magrini, L.1, Author
Cresci, G.1, Author
Beccari, G.1, Author
Battaglia, G.1, Author
Fraternali, F.1, Author
de Zeeuw, P. T.1, Author
Martin, N. F.1, Author
Calura, F.1, Author
Ibata, R.1, Author
Coccato, L.1, Author
Testa, V.1, Author
Correnti, M.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: H &lt sc&gt ii&lt /sc&gt regions galaxies: clusters: individual: Virgo cluster galaxies: dwarf galaxies: interactions galaxies: star formation Astrophysics - Astrophysics of Galaxies
 Abstract: SECCO 1 is an extremely dark, low-mass (M⋆ ≃ 105 M☉), star-forming stellar system lying in the low-velocity cloud (LVC) substructure of the Virgo cluster of galaxies, and hosting several H II regions. Here, we review our knowledge of this remarkable system, and present the results of (a) additional analysis of our panoramic spectroscopic observations with MUSE, (b) the combined analysis of Hubble Space Telescope and MUSE data, and (c) new narrow- band observations obtained with OSIRIS@GTC to search for additional H II regions in the surroundings of the system. We provide new evidence supporting an age as young as ≲ 4 Myr for the stars that are currently ionizing the gas in SECCO 1. We identify only one new promising candidate H II region possibly associated with SECCO 1, thus confirming the extreme isolation of the system. We also identify three additional candidate pressure-supported dark clouds in Virgo among the targets of the SECCO survey. Various possible hypotheses for the nature and origin of SECCO 1 are considered and discussed, also with the help of dedicated hydrodynamical simulations showing that a hydrogen cloud with the characteristics of SECCO 1 can likely survive for ≳ 1 Gyr while travelling within the LVC Intra Cluster Medium.

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 Dates: 2018
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 476 Sequence Number: - Start / End Page: 4565 - 4583 Identifier: -