Abstract
Using the Gemini Multi Object Spectrograph (GMOS) we search for optical
counterparts of two massive (∼109 M ⊙)
neutral hydrogen clouds near the spiral galaxy IC 5270, located in the
outskirts of the IC 1459 group. These two H I clouds were recently
discovered using the Australian Square Kilometer Array Pathfinder
(ASKAP). Two low surface brightness optical counterparts to one of these
H I clouds are identified in the new Gemini data that reaches down to
magnitudes of ∼27.5 mag in the g-band. The observed H I
mass-to-light ratio derived with these new data,
{M}{{H}{{I}}}/{L}g=242, is among the highest
reported to date. We are also able to rule out that the two H I clouds
are dwarf companions of IC 5270. Tidal interactions and ram pressure
stripping are plausible explanations for the physical origin of these
two clouds.
Original language | English |
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Article number | L6 |
Journal | The Astrophysical Journal Letters |
Volume | 854 |
Issue number | 1 |
DOIs | |
Publication status | Published - 10 Feb 2018 |
Externally published | Yes |