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Redshift, metallicity and size of two extended dwarf Irregular galaxies. A link between dwarf Irregulars and ultra diffuse galaxies?

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 27 Jan 2017Embargo end date: 01 Jan 2017 Italy English Publisher:Oxford University Press (OUP)Journal:Monthly Notices of the Royal Astronomical Society (issn: 0035-8711, eissn: 1365-2966,

Authors: Michele Bellazzini; Vasily Belokurov; Vincenzo Testa; Giacomo Beccari; Laura Magrini; A. Marchetti; A. Marchetti; +2 Authors

doi: 10.1093/mnras/stx236 , 10.48550/arxiv.1701.07632

arXiv: http://arxiv.org/abs/1701.07632

handle: 11585/586295

Redshift, metallicity and size of two extended dwarf Irregular galaxies. A link between dwarf Irregulars and ultra diffuse galaxies?

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Abstract

We present the results of the spectroscopic and photometric follow-up of two field galaxies that were selected as possible stellar counterparts of local high velocity clouds. Our analysis shows that the two systems are distant (D>20 Mpc) dwarf irregular galaxies unrelated to the local HI clouds. However, the newly derived distance and structural parameters reveal that the two galaxies have luminosities and effective radii very similar to the recently identified Ultra Diffuse Galaxies (UDGs). At odds with classical UDGs, they are remarkably isolated, having no known giant galaxy within ~2.0 Mpc. Moreover, one of them has a very high gas content compared to galaxies of similar stellar mass, with a HI to stellar mass ratio M_HI/M_* ~90, typical of almost-dark dwarfs. Expanding on this finding, we show that extended dwarf irregulars overlap the distribution of UDGs in the M_V vs. log(r_e) plane and that the sequence including dwarf spheroidals, dwarf irregulars and UDGs appears as continuously populated in this plane.

Accepted for publication by MNRAS. PDFLatex. 8 pages, 4 figures, 2 tables

Country

Italy

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THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE
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Keywords

ISM:HIIregions–galaxies:dwarf–galaxies:starformation–galaxies:structure, Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astrophysics - Astrophysics of Galaxies

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