Low surface brightness galaxies in <i>z</i> > 1 galaxy clusters: HST approaching the progenitors of local ultra diffuse galaxies
نویسندگان
چکیده
Ultra diffuse galaxies (UDGs) are a type of large low surface brightness (LSB) with particularly effective radii ( r eff > 1.5 kpc) that now routinely studied in the Local z < 0.1) Universe. While they found to be abundant clusters, groups, and field, their formation mechanisms remain elusive comprise an active topic debate. New insights may by studying counterparts at higher redshifts 1.0), even though cosmological dimming makes them difficult detect study this channel. In work, we use deepest Hubble Space Telescope (HST) imaging stacks 1 namely, SPT-CL J2106−5844 MOO J1014+0038. These two = 1.13 1.23, respectively, were monitored as part HST See-Change programme. making comparison Extreme Deep Field reference find statistical over-densities LSB both clusters. Based on stellar-population modelling assuming no size evolution, faintest sources can about bright expected for progenitors brightest local UDGs. We LSBs J1014−5844 already have old stellar populations place red sequence. correcting incompleteness based extrapolation scaling relations, estimate distant UDGs relatively under-abundant, compared UDGs, factor ∼3. A plausible explanation implied increase over time would significant growth these last ∼8 Gyr, also suggested hydrodynamical simulations.
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics
سال: 2021
ISSN: ['0004-6361', '1432-0746']
DOI: https://doi.org/10.1051/0004-6361/202040097