62 citations · 279 across the 22 of their papers we have counts for
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MUSE observations of dwarf galaxies and a stellar stream in the M83 group
Oliver Müller, Marina Rejkuba, Katja Fahrion +8
Spectroscopy for faint dwarf galaxies outside of our own Local Group is challenging. Here, we present MUSE spectroscopy to study the properties of four known dwarf satellites and o…
New dwarf galaxy candidates in the M106, NGC3521, and UGCA127 groups with the Hyper Suprime Camera
Oliver Müller, Helmut Jerjen, Salvatore Taibi +3
The local universe is still full of hidden dwarf galaxies to be discovered using deep imaging campaigns. Here we present the third paper in a series to search for low-surface brigh…
Testing a proposed "planarity" tool for studying satellite systems: On the alleged consistency of Milky Way satellite galaxy planes with CDM
Marcel S. Pawlowski, Mariana P. Júlio, Kosuke Jamie Kanehisa +1
The existence of planes of satellite galaxies has been identified as a long-standing challenge to CDM cosmology, due to the rarity of satellite systems in cosmological simulatio…
Dwarf Galaxies in the MATLAS Survey: The satellite system of NGC474 under scrutiny with MUSE
Oliver Müller, Francine R. Marleau, Nick Heesters +12
A recent study of the distribution of dwarf galaxies in the MATLAS sample in galaxy groups revealed an excess of flattened satellite structures, reminiscent of the co-rotating plan…
Simulations of cluster ultra-diffuse galaxies in MOND
Srikanth T. Nagesh, Jonathan Freundlich, Benoit Famaey +4
Ultra-diffuse galaxies (UDGs) in the Coma cluster have velocity dispersion profiles that are in full agreement with the predictions of Modified Newtonian Dynamics (MOND) in isolati…
Lopsided distribution of MATLAS and ELVES dwarf satellite systems around isolated host galaxies
Nick Heesters, Helmut Jerjen, Oliver Müller +2
The properties of satellite dwarf galaxies pose important empirical constraints to verify cosmological models on galaxy scales. Their phase-space correlations, in particular, offer…
The satellite galaxy plane of NGC 4490 in light of ΛCDM - Sparsity of similarly extreme analogs and a possible role of satellite pairs
Marcel S. Pawlowski, Oliver Müller, Salvatore Taibi +3
The galaxy system around NGC4490 was recently highlighted to display a flattened, kinematically correlated structure reminiscent of satellite galaxy planes around other hosts. Sinc…
A too-many dwarf satellite galaxies problem in the MATLAS low-to-moderate density fields
Kosuke Jamie Kanehisa, Marcel S. Pawlowski, Nick Heesters +1
Dwarf galaxy abundances can serve as discernment tests for models of structure formation. Previous small-scale tensions between observations and dark matter-only cosmological simul…
A too-many dwarf galaxy satellites problem in the M83 group
Oliver Müller, Marcel S. Pawlowski, Yves Revaz +4
Dwarf galaxies in groups of galaxies provide excellent test cases for models of structure formation. This led to a so-called small-scale crisis, including the famous missing satell…
The phase-space distribution of the M81 satellite system
Oliver Müller, Nick Heesters, Marcel S. Pawlowski +3
The spatial distribution of dwarf galaxies around their host galaxies is a critical test for the standard model of cosmology because it probes the dynamics of dark matter halos and…
The Halos and Environments of Nearby Galaxies (HERON) Survey IV: Complexity in the boxy galaxies NGC 720 and NGC 2768
Andreas J. Koch-Hansen, Anna Pasquali, R. Michael Rich +2
The shapes of galaxies, in particular their outer regions, are important guideposts to their formation and evolution. Here we report on the discovery of strongly box-shaped morphol…
Expanding on the Fundamental Metallicity Relation in Dwarf Galaxies with MUSE
Teodora-Elena Bulichi, Katja Fahrion, François Mernier +10
The mass-metallicity relation (MZR) represents one of the most important scaling relations in the context of galaxy evolution, comprising a positive correlation between stellar mas…
Do old globular clusters in low mass galaxies disprove modified gravity?
Michal Bílek, Hongsheng Zhao, Benoit Famaey +6
The controversy "dark matter vs. modified gravity" constitutes a major topic of discussion. It was proposed that dynamical friction could be used to discriminate between the two al…
Planes of satellites in the nearby Universe
Oliver Müller
Since the mid 70ies it is known that the dwarf galaxies around the Milky Way are arranged in a thin, polar structure. The arrangement and motion within this structure has been iden…
Nuclear star cluster formation in star-forming dwarf galaxies
Katja Fahrion, Teodora-Elena Bulichi, Michael Hilker +7
Nuclear star clusters (NSCs) are massive star clusters found in all types of galaxies from dwarfs to massive galaxies. Recent studies show that while low-mass NSCs in dwarf galaxie…
Flattened structures of dwarf satellites around massive host galaxies in the MATLAS low-to-moderate density fields
N. Heesters, R. Habas, F. R. Marleau +6
It was first observed in the 1970s that the dwarf galaxies surrounding our Milky Way, so-called satellites, appear to be arranged in a thin, vast plane. Similar discoveries have be…
Testing the performance of the Milanković telescope
A. Vudragović, M. Bílek, O. Müller +2
We have undertaken a multi-band imaging campaign of several galaxies to study their low surface brightness features such as shells and streams. Using the 1.4-m Milanković telescope…
The coherent motion of Cen A dwarf satellite galaxies remains a challenge for CDM cosmology
Oliver Müller, Marcel S. Pawlowski, Federico Lelli +6
The plane-of-satellites problem is one of the most severe small-scale challenges for the standard CDM cosmological model: several dwarf galaxies around the Milky Way and Androme…
The properties of dwarf spheroidal galaxies in the Cen A group: Stellar populations, internal dynamics, and a heart-shaped Halpha ring
Oliver Müller, Katja Fahrion, Marina Rejkuba +7
Dwarf spheroidal galaxies (dSphs) have been extensively investigated in the Local Group, but their low luminosity and surface brightness make similar work in more distant galaxy gr…
Newly discovered dwarf galaxies in the MATLAS low density fields
Rebecca Habas, Francine R. Marleau, Pierre-Alain Duc +16
We present the photometric properties of 2210 newly identified dwarf galaxy candidates in the MATLAS fields. The Mass Assembly of early Type gaLAxies with their fine Structures (MA…
Hunting for low-surface brightness features in nearby galaxy groups
Oliver Müller
On the scale of dwarf galaxies, several tensions between observations and the theory of structure formation have been identified in the Local Group of galaxies. One of them, the pl…
Tip of the red giant branch distance to the nearby dwarf galaxy [TT2009] 25 in the NGC 891 group
Oliver Müller, Rodrigo Ibata, Marina Rejkuba +1
Dwarf galaxies are key objects for small-scale cosmological tests like the abundance problems or the planes-of-satellites problem. It is therefore a crucial task to get accurate in…