Bibcode
Bellazzini, M.; Magrini, L.; Mucciarelli, A.; Beccari, G.; Ibata, R.; Battaglia, G.; Martin, N.; Testa, V.; Fumana, M.; Marchetti, A.; Correnti, M.; Fraternali, F.
Bibliographical reference
The Astrophysical Journal Letters, Volume 800, Issue 1, article id. L15, 6 pp. (2015).
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2
2015
Citations
22
Refereed citations
22
Description
Within the SECCO survey we identified a candidate stellar counterpart to
the Ultra Compact High Velocity Cloud (UCHVC) HVC274.68+74.70-123 that
was suggested by Adams et al. to be a possible mini halo within the
Local Group of galaxies. The spectroscopic follow-up of the brightest
sources within the candidate reveals the presence of two H ii regions
whose radial velocity is compatible with a physical association with the
UVHVC. The available data do not allow us to give a definite answer on
the nature of the newly identified system. A few alternative hypotheses
are discussed. However, the most likely possibility is that we have
found a new faint dwarf galaxy residing in the Virgo cluster of
galaxies, which we name SECCO 1. Independently of its actual distance,
SECCO 1 displays a ratio of neutral hydrogen mass to V luminosity of
{{M}H I}/{{L}V}≳ 20, by far the largest among
local dwarfs. Hence, it appears to be a nearly starless galaxy and it
may be an example of the missing links between normal dwarfs and the
dark mini halos that are predicted to exist in large numbers according
to the currently accepted cosmological model.
Based on data acquired using the Large Binocular Telescope (LBT). The
LBT is an international collaboration among institutions in the United
States, Italy, and Germany. LBT Corporation partners are The University
of Arizona on behalf of the Arizona university system; Istituto
Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany,
representing the Max-Planck Society, the Astrophysical Institute
Potsdam, and Heidelberg University; The Ohio State University; and The
Research Corporation, on behalf of The University of Notre Dame,
University of Minnesota, and University of Virginia.
Related projects
Galaxy Evolution in the Local Group
Galaxy formation and evolution is a fundamental Astrophysical problem. Its study requires “travelling back in time”, for which there are two complementary approaches. One is to analyse galaxy properties as a function of red-shift. Our team focuses on the other approach, called “Galactic Archaeology”. It is based on the determination of galaxy
Matteo
Monelli