SIMBAD references

2017A&A...601L..10P - Astronomy and Astrophysics, volume 601, L10-10 (2017/5-1)

The HI content of isolated ultra-diffuse galaxies: A sign of multiple formation mechanisms?

PAPASTERGIS E., ADAMS E.A.K. and ROMANOWSKY A.J.

Abstract (from CDS):

We report on the results of radio observations in the 21 cm emission line of atomic hydrogen (HI) of four relatively isolated ultra-diffuse galaxies (UDGs): DGSAT I, R-127-1, M-161-1, and SECCO-dI-2. Our Effelsberg observations resulted in non-detections for the first three UDGs, and a clear detection for the last. DGSAT I, R-127-1, and M-161-1 are quiescent galaxies with gas fractions that are much lower than those of typical field galaxies of the same stellar mass. On the other hand, SECCO-dI-2 is a star forming gas-rich dwarf, similar to two other field UDGs that have literature HI data: SECCO-dI-1 and UGC 2162. This group of three gas-rich UDGs have stellar and gaseous properties that are compatible with a recently proposed theoretical mechanism for the formation of UDGs, based on feedback-driven outflows. In contrast, the physical characteristics of R-127-1 and M-161-1 are puzzling, given their isolated nature. We interpret this dichotomy in the gaseous properties of field UDGs as a sign of the existence of multiple mechanisms for their formation, with the formation of the quiescent gas-poor UDGs remaining a mystery.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: dwarf - galaxies: formation - galaxies: ISM - galaxies: fundamental parameters - galaxies: fundamental parameters

CDS comments: SECCO-dI-1 is MGC 95504 in SIMBAD.

Simbad objects: 16

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2019.12.06-06:53:19

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