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Strategies for optimal sky subtraction in the low surface brightness regime
(2024-03-01)
The low surface brightness (LSB) regime (μg ≳ 26 mag arcsec−2) comprises a vast, mostly unexplored discovery space, from dwarf galaxies to the diffuse interstellar medium. Accessing this regime requires precisely removing ...
Population statistics of intermediate-mass black holes in dwarf galaxies using the NEWHORIZON simulation
(2023-08-30)
While it is well established that supermassive black holes (SMBHs) co-evolve with their host galaxy, it is currently less clear how lower mass black holes, so-called intermediate mass black holes (IMBHs), evolve within ...
A possible signature of the influence of tidal perturbations in dwarf galaxy scaling relations
(2023-03-02)
Dwarf galaxies are excellent cosmological probes, because their shallow potential wells make them very sensitive to the key processes that drive galaxy evolution, including baryonic feedback, tidal interactions, and ram ...
Radio AGN in nearby dwarf galaxies: the important role of AGN in dwarf-galaxy evolution
(2022-02-04)
We combine deep optical and radio data, from the Hyper Suprime-Cam and the Low-Frequency Array (LOFAR) respectively, to study 78 radio AGN in nearby (z < 0.5) dwarf galaxies. Comparison to a control sample, matched in ...
Extremely massive disc galaxies in the nearby Universe form through gas-rich minor mergers
(2022-01-14)
In our hierarchical structure-formation paradigm, the observed morphological evolution of massive galaxies -- from rotationally-supported discs to dispersion-dominated spheroids -- is largely explained via galaxy merging. ...
Dark-matter-deficient dwarf galaxies form via tidal stripping of dark matter in interactions with massive companions
(2021-01-15)
In the standard Lambda-CDM paradigm, dwarf galaxies are expected to be dark-matter-rich, as baryonic feedback is thought to quickly drive gas out of their shallow potential wells and quench star formation at early epochs. ...
The origin of low-surface-brightness galaxies in the dwarf regime
(2021-01-13)
Low-surface-brightness galaxies (LSBGs) -- defined as systems that are fainter than the surface-brightness limits of past wide-area surveys -- form the overwhelming majority of galaxies in the dwarf regime (M* < 10^9 MSun). ...
The role of mergers and interactions in driving the evolution of dwarf galaxies over cosmic time
(2020-11-07)
Dwarf galaxies (M⋆ < 109 M☉) are key drivers of mass assembly in high-mass galaxies, but relatively little is understood about the assembly of dwarf galaxies themselves. Using the NEWHORIZON cosmological simulation (∼40 ...
Transfer learning for galaxy morphology from one survey to another
(2018-12-28)
Deep Learning (DL) algorithms for morphological classification of galaxies have proven very successful, mimicking (or even improving) visual classifications. However, these algorithms rely on large training samples of ...
The distribution of local star formation activity as a function of galaxy stellar mass, environment and morphology
(2017-12-21)
We present a detailed inventory of star formation in the local Universe, dissecting the cosmic star formation budget as a function of key variables that influence the star formation rate (SFR) of galaxies: stellar mass, ...