Gemini Follow-up of Two Massive H I Clouds Discovered with the Australian Square Kilometer Array Pathfinder

Juan P. Madrid, Karen Lee-Waddell, Paolo Serra, Bärbel S. Koribalski, Mischa Schirmer, Kristine Spekkens, Jing Wang

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1 Citation (Scopus)

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 languageEnglish
JournalThe Astrophysical Journal Letters
Volume854
Issue number1
DOIs
Publication statusPublished - 1 Feb 2018
Externally publishedYes

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