Publications (91)
The Cosmic Ballet II: Spin alignment of galaxies and haloes with large-scale filaments in the EAGLE simulation
Punyakoti Ganeshaiah Veena, Marius Cautun, Elmo Tempel +2
We investigate the alignment of galaxies and haloes relative to cosmic web filaments using the EAGLE hydrodynamical simulation. We identify filaments by applying the NEXUS+ method…
The stellar halo in Local Group Hestia simulations II. The accreted component
Sergey Khoperskov, Ivan Minchev, Noam Libeskind +12
In the Milky Way, recent progress in the exploration of its assembly history is driven by the tremendous amount of high-quality data delivered by Gaia, which has revealed a number…
Galaxy pairs align with galactic filaments
Elmo Tempel, Antti Tamm
Context. Gravitational collapse theory and numerical simulations suggest that the velocity field within large-scale galaxy filaments is dominated by motions along the filaments. Ai…
Alignment of spiral and elliptical galaxies from Siena Galaxy Atlas with filaments
Yuvraj Muralichandran, Noam I. Libeskind, Elmo Tempel
The properties of galaxies are known to have been influenced by the large-scale structures that they inhabit. Theory suggests that galaxies acquire angular momentum during the line…
Photometric redshift galaxies as tracers of the filamentary network
Maarja Kruuse, Elmo Tempel, Rain Kipper +1
Galaxy filaments are the dominant feature in the overall structure of the cosmic web. The study of the filamentary web is an important aspect in understanding galaxy evolution and…
WST -- Wide-field Spectroscopic Telescope: The Next Leap in Wide-field Spectroscopy
Roland Bacon, Olga Bellido, Philippe Dierickx +53
The Wide-field Spectroscopic Telescope (WST) is a concept for a dedicated 12-m spectroscopic survey facility designed to address some of the most important questions in astrophysic…
Environments of galaxies in groups within the supercluster-void network
Heidi Lietzen, Elmo Tempel, Pekka Heinämäki +3
Majority of all galaxies reside in groups of less than 50 member galaxies. These groups are distributed in various large-scale environments from voids to superclusters. Evolution o…
Assessing the reliability of the Bisous filament finder
Moorits Mihkel Muru, Elmo Tempel
Aims. This work provides an analysis of how the galaxy number density of the input data affects the filaments detected with the Bisous filament finder and gives estimates of the re…
Double gamma-ray lines from unassociated Fermi-LAT sources revisited
Andi Hektor, Martti Raidal, Elmo Tempel
We search for the presence of double gamma-ray line from unassociated Fermi-LAT sources including detailed Monte Carlo simulations to study its global statistical significance. App…
Cold and Hot gas distribution around the Milky-Way-M31 system in the HESTIA simulations
Mitali Damle, Martin Sparre, Philipp Richter +11
Recent observations have revealed remarkable insights into the gas reservoir in the circumgalactic medium (CGM) of galaxy haloes. In this paper, we characterise the gas in the vici…
Cosmic Ballet III: halo spin evolution in the cosmic web
Punyakoti Ganeshaiah Veena, Marius Cautun, Rien van de Weygaert +2
We explore the evolution of halo spins in the cosmic web using a very large sample of dark matter haloes in the CDM Planck-Millennium N-body simulation. We use the NEXUS+ multi…
Alignment between satellite and central galaxies in the SDSS DR7: dependence on large-scale environment
Peng Wang, Yu Luo, Xi Kang +5
The alignment between satellites and central galaxies has been studied in detail both in observational and theoretical works. The widely accepted fact is that the satellites prefer…
The COSMOS-Web deep galaxy group catalog up to
Greta Toni, Ghassem Gozaliasl, Matteo Maturi +41
Galaxy groups with and up to a few tens of members are the most common galaxy environment, marking the transition between field and massive clu…
Hermeian haloes: Field haloes that interacted with both the Milky Way and M31
Oliver Newton, Noam I. Libeskind, Alexander Knebe +8
The Local Group is a unique environment in which to study the astrophysics of galaxy formation. The proximity of the Milky Way and M31 enhances the frequency of interactions of the…
The effect of cosmic web filaments on the properties of groups and their central galaxies
Anup Poudel, Pekka Heinämäki, Elmo Tempel +3
The nature versus nurture scenario in galaxy and group evolution is a long-standing problem not yet fully understood on cosmological scales. We study the properties of groups and t…
Galaxy groups and clusters and their brightest galaxies within the cosmic web
Maret Einasto, Jaan Einasto, Peeter Tenjes +5
Our aim is to combine data on single galaxies, galaxy groups, their BGGs, and their location in the cosmic web, to determine classes of groups, and to obtain a better understanding…
Using photometric redshift data to improve the detection of galactic filaments with the Bisous model
Moorits Mihkel Muru, Elmo Tempel
Filament finders are limited, among other things, by the abundance of spectroscopic redshift data. As there are proportionally more photometric redshift data than spectroscopic, we…
Testing and Combining Transient Spectral Classification Tools on 4MOST-like Blended Spectra
Andrew Milligan, Isobel Hook, Christopher Frohmaier +15
With the 4-meter Multi-Object Spectroscopic Telescope (4MOST) expected to provide an influx of transient spectra when it begins observations in early 2026 we consider the potential…
The Hestia project: simulations of the Local Group
Noam I. Libeskind, Edoardo Carlesi, Rob J. J. Grand +19
We present the Hestia simulation suite: High-resolutions Environmental Simulations of The Immediate Area, a set of cosmological simulations of the Local Group. Initial conditions c…
Reliability of the detection of the Baryon Acoustic Peak
Vicent J. Martinez, Pablo Arnalte-Mur, Enn Saar +5
The correlation function of the distribution of matter in the universe shows, at large scales, baryon acoustic oscillations, which were imprinted prior to recombination. This featu…
The lopsided distribution of satellites of isolated central galaxies
Peng Wang, Noam I. Libeskind, Marcel S. Pawlowski +4
Satellites are not randomly distributed around their central galaxies but show polar and planar structures. In this paper, we investigate the axis-asymmetry or lopsidedness of sate…
The alignment of galaxy spin with the shear field in observations
Isha Pahwa, Noam I. Libeskind, Elmo Tempel +6
Tidal torque theory suggests that galaxies gain angular momentum in the linear stage of structure formation. Such a theory predicts alignments between the spin of haloes and tidal…
Period change of massive binaries from combined photometric and spectroscopic data in Cygnus OB2
Jaan Laur, Elmo Tempel, Taavi Tuvikene +2
Context. Mass loss is an important property in evolution models of massive stars. As up to 90% of the massive stars have a visual or spectroscopic companion and many of them exhibi…
An evidence for indirect detection of dark matter from galaxy clusters in Fermi-LAT data
Andi Hektor, Martti Raidal, Elmo Tempel
We search for spectral features in Fermi-LAT gamma-rays coming from regions corresponding to eighteen brightest nearby galaxy clusters determined by the magnitude of their signal l…
Statistically bias-minimized peculiar velocity catalogs from Gibbs point processes and Bayesian inference
Jenny G. Sorce, Radu S. Stoica, Elmo Tempel
Galaxy peculiar velocities are excellent cosmological probes provided that biases inherent to their measurements are contained before any study. This paper proposes a new algorithm…
Back to the present: A general treatment for the tidal field from the wake of dynamical friction
Rain Kipper, Peeter Tenjes, MarÃa Benito +6
Dynamical friction can be a valuable tool for inferring dark matter properties that are difficult to constrain by other methods. Most applications of dynamical friction calculation…
From voids to filaments: environmental transformations of galaxies in the SDSS
Teet Kuutma, Antti Tamm, Elmo Tempel
We investigate the impact of filament and void environments on galaxies, looking for residual effects beyond the known relations with environment density. We quantified the host en…
Stellar kinematics using a third integral of motion: method and application on the Andromeda galaxy
Rain Kipper, Peeter Tenjes, Olga Tihhonova +2
We probe the feasibility of describing the structure of a multi-component axisymmetric galaxy with a dynamical model based on the Jeans equations while taking into account a third…
Filaments from the galaxy distribution and from the velocity field in the local universe
Noam I. Libeskind, Elmo Tempel, Yehuda Hoffman +2
The cosmic web that characterizes the large-scale structure of the Universe can be quantified by a variety of methods. For example, large redshift surveys can be used in combinatio…
The Corona Borealis supercluster: connectivity, collapse, and evolution
Maret Einasto, Rain Kipper, Peeter Tenjes +7
We present a study of the Corona Borealis (CB) supercluster. We determined the high-density cores of the CB and the richest galaxy clusters in them, and studied their dynamical sta…
The shape alignment of satellite galaxies in galaxy pairs in SDSS
Peng Wang, Quan Guo, Noam I. Libeskind +3
It has been shown, both in simulations and observationally, that the tidal field of a large galaxy can torque its satellites such that the major axis of satellite galaxies points t…
Kinematics of the Local Group gas and galaxies in the Hestia simulations
Luis Biaus, Sebastián E. Nuza, Philipp Richter +8
We investigate the kinematic properties of gas and galaxies in the Local Group (LG) using high-resolution simulations performed by the {\sc Hestia} (High-resolution Environmental S…
How does the grouping scheme affect the Wiener Filter reconstruction of the local Universe?
Jenny G. Sorce, Elmo Tempel
High quality reconstructions of the three dimensional velocity and density fields of the local Universe are essential to study the local Large Scale Structure. In this paper, the W…
Galaxy clusters in simulations of the local Universe: a matter of constraints
Jenny G. Sorce, Elmo Tempel
To study the full formation and evolution history of galaxy clusters and their population, high resolution simulations of the latter are flourishing. However comparing observed clu…
Exploring the origin of ultra-diffuse galaxies in clusters from their primordial alignment
Yu Rong, Pavel E. Mancera Piña, Elmo Tempel +2
We find that the minor axes of the ultra-diffuse galaxies (UDGs) in Abell 2634 tend to be aligned with the major axis of the central dominant galaxy, at a confidence…
Visible and dark matter in M 31 - II. A dynamical model and dark matter density distribution
Elmo Tempel, Antti Tamm, Peeter Tenjes
In the present paper we derive the density distribution of dark matter (DM) in a well-observed nearby disc galaxy, the Andromeda galaxy. From photometrical and chemical evolution m…
Hot WHIM counterparts of FUV OVI absorbers: Evidence in the line-of-sight towards quasar 3C 273
Jussi Ahoranta, Jukka Nevalainen, Nastasha Wijers +7
We explore the high spectral resolution X-ray data towards the quasar 3C273 to search for signals of hot ( K) X-ray-absorbing gas co-located with two established inte…
The Scaling Relation between Galaxy Luminosity and WHIM Density from EAGLE Simulations with application to SDSS data
Patrick Holt, Toni Tuominen, Jukka Nevalainen +4
This paper presents an updated scaling relation between the optical luminosity density (LD) of galaxies in the band and the density of the warm-hot intergalactic medium (WHIM)…
The 4MOST-Cosmology Redshift Survey: Target Selection of Bright Galaxies and Luminous Red Galaxies
Aurelien Verdier, Antoine Rocher, Behnood Bandi +7
The Cosmology Redshift Survey of the 4-metre Multi-Object Spectroscopic Telescope (4MOST-CRS) will provide redshift measurements of galaxies and quasars over 5700{\degsq} in the so…
Fermi-LAT gamma-ray signal from Earth Limb, systematic detector effects and their implications for the 130 GeV gamma-ray excess
Andi Hektor, Martti Raidal, Elmo Tempel
We look for possible spectral features and systematic effects in Fermi-LAT publicly available high-energy gamma-ray data by studying photons from the Galactic centre, nearby galaxy…
Death at watersheds: galaxy quenching in low-density environments
Maret Einasto, Rain Kipper, Peeter Tenjes +3
Our aim is to understand the effect of environment to galaxy quenching in various local and global environments. We focus on galaxies with very old stellar populations (VO galaxies…
Tidal forces from the wake of dynamical friction: warps, lopsidedness and kinematic misalignment
Rain Kipper, MarÃa Benito, Peeter Tenjes +2
A galaxy moving through a background of dark matter particles, induces an overdensity of these particles or a wake behind it. The back reaction of this wake on the galaxy is a forc…
The stellar halo in Local Group Hestia simulations I. The in-situ component and the effect of mergers
Sergey Khoperskov, Ivan Minchev, Noam Libeskind +12
Theory suggests that mergers play an important role in shaping galactic discs and stellar haloes, which was observationally confirmed in the MW thanks to Gaia data. In this work, a…
Bayesian group finder based on marked point processes. Method and feasibility study using the 2MRS data set
Elmo Tempel, Maarja Kruuse, Rain Kipper +3
Galaxy groups and clusters are formidable cosmological probes. They permit the studying of the environmental effects on galaxy formation. A reliable detection of galaxy groups is a…
Dust-corrected surface photometry of M 31 from the Spitzer far infrared observations
Elmo Tempel, Antti Tamm, Peeter Tenjes
We create a model for recovering the intrinsic, absorption-corrected surface brightness distribution of a galaxy and apply the model to the M31. We construct a galactic model as a…
The alignment of satellite systems with cosmic filaments in the SDSS DR12
Peng Wang, Noam I. Libeskind, Elmo Tempel +3
Galaxies, as well as their satellites, are known to form within the cosmic web: the large, multi-scale distribution of matter in the universe. It is known that the surrounding larg…
DINGO/GAMA /WAVES: HI-halo mass relation
Ajay Dev, Martin Meyer, Simon P. Driver +17
We investigate the relation between neutral atomic hydrogen (HI) and dark matter halo mass (HIHM) using observations from the Deep Investigation of Neutral Gas Origins (DINGO) pilo…
Fermi 130 GeV gamma-ray excess and dark matter annihilation in sub-haloes and in the Galactic centre
Elmo Tempel, Andi Hektor, Martti Raidal
We analyze publicly available Fermi-LAT high-energy gamma-ray data and confirm the existence of clear spectral feature peaked at E=130GeV. Scanning over the Galaxy we identify seve…
The role of stochastic and smooth processes in regulating galaxy quenching
Rain Kipper, Antti Tamm, Elmo Tempel +2
Galaxies can be classified as passive ellipticals or star-forming discs. Ellipticals dominate at the high end of the mass range, and therefore there must be a mechanism responsible…
Galaxy spin alignment in filaments and sheets: observational evidence
Elmo Tempel, Noam I. Libeskind
Galaxies properties are known to be affected by their environment. One important question is how their angular momentum reflects the surrounding cosmic web. We use the SDSS to inve…
The stellar halo in Local Group Hestia simulations III. Chemical abundance relations for accreted and in-situ stars
Sergey Khoperskov, Ivan Minchev, Noam Libeskind +10
Since the chemical abundances of stars are the fossil records of the physical conditions in galaxies, they provide the key information for recovering the assembly history of galaxi…
Possible observational evidence that cosmic filaments spin
Peng Wang, Noam I. Libeskind, Elmo Tempel +2
Most cosmological structures in the universe spin. Although structures in the universe form on a wide variety of scales from small dwarf galaxies to large super clusters, the gener…
Multiscale cosmic web detachments, connectivity, and preprocessing in the supercluster SClA2142 cocoon
Maret Einasto, Boris Deshev, Peeter Tenjes +7
We study the properties, connectivity, and galaxy content of groups and filaments in the low-density region (cocoon) around A2142 supercluster (SClA2142). We traced the SClA2142 co…
Merging groups and clusters of galaxies from the SDSS data. The catalogue of groups and potentially merging systems
Elmo Tempel, Taavi Tuvikene, Rain Kipper +1
Galaxy groups and clusters are the main tools used to test cosmological models and to study the environmental effect of galaxy formation. This work provides a catalogue of galaxy g…
Properties of brightest group galaxies in cosmic web filaments
Teet Kuutma, Anup Poudel, Maret Einasto +4
Context. The cosmic web, a complex network of galaxy groups and clusters connected by filaments, is a dynamical environment in which galaxies form and evolve. However, the impact o…
The evolution of high-density cores of the BOSS Great Wall superclusters
Maret Einasto, Peeter Tenjes, Mirt Gramann +6
High-density cores (HDCs) of galaxy superclusters that embed rich clusters and groups of galaxies are the earliest large objects to form in the cosmic web, and the largest objects…
Non-equilibrium in the Solar Neighbourhood using dynamical modelling with Gaia DR2
Rain Kipper, Peeter Tenjes, Elmo Tempel +1
Matter distribution models of the Milky Way galaxy are usually stationary, although there are known to be wave-like perturbations in the disc at level of the total densi…
CHANCES, the Chilean Cluster Galaxy Evolution Survey: Selection and initial characterisation of clusters and superclusters
Cristóbal Sifón, Alexis Finoguenov, Christopher P. Haines +43
CHANCES, the CHileAN Cluster galaxy Evolution Survey, will study the evolution of galaxies in and around 100 massive galaxy clusters from the local Universe out to , and…
The Cosmic Ballet: spin and shape alignments of haloes in the cosmic web
Punyakoti Ganeshaiah Veena, Marius Cautun, Rien van de Weygaert +4
We investigate the alignment of haloes with the filaments of the cosmic web using an unprecedently large sample of dark matter haloes taken from the P-Millennium CDM cosmologic…
A method to calculate gravitational accelerations within discrete localised regions in the Milky Way
Rain Kipper, Elmo Tempel, Peeter Tenjes
We present a method to calculate gravitational potential gradients within regions containing few tens of thousands stars with known phase space coordinates. The central idea of the…
Detecting the neutral IGM in filaments with the SKA
Robin Kooistra, Marta B. Silva, Saleem Zaroubi +3
The intergalactic medium (IGM) plays an important role in the formation and evolution of galaxies. Recent developments in upcoming radio telescopes are starting to open up the poss…
Sloan Great Wall as a complex of superclusters with collapsing cores
Maret Einasto, Heidi Lietzen, Mirt Gramann +6
In the cosmic web, galaxy superclusters or their high-density cores are the largest objects that may collapse at present or during the future evolution. We study the dynamical stat…
Visible and dark matter in M31 - I. Properties of stellar components
Antti Tamm, Elmo Tempel, Peeter Tenjes
We construct a structural model of the Andromeda Galaxy, simultaneously corresponding to observed photometrical and kinematical data and chemical abundances. In this paper we prese…
Supercluster A2142 and collapse in action - infalling and merging groups and galaxy transformations
Maret Einasto, Mirt Gramann, Changbom Park +8
We study the dynamical state and properties of galaxies and groups in the supercluster SClA2142 that has a collapsing core, to understand its possible formation and evolution. We f…
Galaxy Spectra neural Network (GaSNet). II. Using Deep Learning for Spectral Classification and Redshift Predictions
Fucheng Zhong, Nicola R. Napolitano, Caroline Heneka +25
Large sky spectroscopic surveys have reached the scale of photometric surveys in terms of sample sizes and data complexity. These huge datasets require efficient, accurate, and fle…
SDSS surface photometry of M 31 with absorption corrections
Elmo Tempel, Taavi Tuvikene, Antti Tamm +1
The objective of this work is to obtain an extinction-corrected distribution of optical surface brightness and colour indices of the large nearby galaxy M 31 using homogeneous obse…
A method to calculate the local density distribution of the Galaxy from the Tycho-Gaia Astrometric Solution data
Rain Kipper, Elmo Tempel, Peeter Tenjes
New and more reliable distances and proper motions of a large number of stars in the Tycho-Gaia Astrometric Solution (TGAS) catalogue allow to calculate the local matter density di…
Tracing the cosmic web
Noam I Libeskind, Rien van de Weygaert, Marius Cautun +27
The cosmic web is one of the most striking features of the distribution of galaxies and dark matter on the largest scales in the Universe. It is composed of dense regions packed fu…
Unusual A2142 supercluster with a collapsing core: distribution of light and mass
Maret Einasto, Mirt Gramann, Enn Saar +6
We study the distribution, masses, and dynamical properties of galaxy groups in the A2142 supercluster. We analyse the global luminosity density distribution in the supercluster an…
Cosmic filament spin -- II: filament spin and its impact on galaxy spin-filament alignment in a cosmological simulation
Peng Wang, Xiao-Xiao Tang, Hao-Da Wang +7
Observational studies have reported that cosmic filaments on the megaparsec scale exhibit rotational motion. Subsequent simulation studies have shown qualitative agreement with the…
BOSS Great Wall: morphology, luminosity, and mass
Maret Einasto, Heidi Lietzen, Mirt Gramann +7
We study the morphology, luminosity and mass of the superclusters from the BOSS Great Wall (BGW), a recently discovered very rich supercluster complex at the redshift . W…
Galaxies in filaments have more satellites: the influence of the cosmic web on the satellite luminosity function in the SDSS
Quan Guo, Elmo Tempel, Noam I. Libeskind
We investigate whether the satellite luminosity function (LF) of primary galaxies identified in the Sloan Digital Sky Survey (SDSS) depends on whether the host galaxy is in a filam…
Unveiling the small-scale web around galaxies with miniJPAS and DESI
Daniela Galárraga-Espinosa, Guinevere Kauffmann, Silvia Bonoli +23
We present the first statistical observational study detecting filaments in the immediate surroundings of galaxies, i.e. the local web of galaxies. Simulations predict that cold ga…
Identification of Superclusters and their Properties in the Sloan Digital Sky Survey Using WHL Cluster Catalog
Shishir Sankhyayan, Joydeep Bagchi, Elmo Tempel +6
Superclusters are the largest massive structures in the cosmic web on tens to hundreds of megaparsecs (Mpc) scales. They are the largest assembly of galaxy clusters in the Universe…
SAGAN-VI: When Jets Meet Filaments -- Environmental Imprints on the Growth of Giant Radio Galaxies
Mousumi Mahato, Elmo Tempel, Shishir Sankhyayan +2
Giant radio galaxies (GRGs) represent the largest individual astrophysical structures, rivalling galaxy clusters in physical extent. Understanding how they attain such scales deman…
The lopsided distribution of satellite galaxies
Noam I Libeskind, Quan Guo, Elmo Tempel +1
The distribution of smaller satellite galaxies around large central galaxies has attracted attention because peculiar spatial and kinematic configurations have been detected in som…
Wide Area VISTA Extra-galactic Survey (WAVES): Unsupervised star-galaxy separation on the WAVES-Wide photometric input catalogue using UMAP and
Todd L. Cook, Behnood Bandi, Sam Philipsborn +13
Star-galaxy separation is a crucial step in creating target catalogues for extragalactic spectroscopic surveys. A classifier biased towards inclusivity risks including spurious sta…
Quantifying torque from the Milky Way bar using Gaia DR2
Rain Kipper, Peeter Tenjes, Taavi Tuvikene +2
We determine the mass of the Milky Way bar and the torque it causes, using Gaia DR2, by applying the orbital arc method. Based on this, we have found that the gravitational acceler…
Spiral arms and disc stability in the Andromeda galaxy
Peeter Tenjes, Taavi Tuvikene, Antti Tamm +2
Aims: Density waves are often considered as the triggering mechanism of star formation in spiral galaxies. Our aim is to study relations between different star formation tracers (s…
The influence of dark matter halo on the stellar stream asymmetry via dynamical friction
Rain Kipper, Peeter Tenjes, Gert Hütsi +2
We study the effect of dynamical friction on globular clusters and on the stars evaporated from the globular clusters (stellar streams) moving in a galactic halo. Due to dynamical…
Superbubbles as the source of dynamical friction: gas migration, stellar and dark matter contributions
Rain Kipper, Indrek Vurm, Aikaterini Niovi Triantafyllaki +2
[Abridged] The gas distribution in galaxies is smooth on large scales, but is usually time-dependent and inhomogeneous on smaller scales. The time-dependence originates from proces…
Full-sky photon simulation of clusters and active galactic nuclei in the soft X-rays for eROSITA
Johan Comparat, Dominique Eckert, Alexis Finoguenov +25
The eROSITA X-ray telescope on board the Spectrum-Roentgen-Gamma (SRG) mission will measure the position and properties of about 100,000 clusters of galaxies and 3 million active g…
An EAGLE view of the missing baryons
Toni Tuominen, Jukka Nevalainen, Elmo Tempel +6
Context. A significant fraction of the predicted baryons remains undetected in the local universe. We adopted the common assumption that a large fraction of the missing baryons cor…
The richest clusters in the Coma and Leo superclusters: Properties and evolution
Maret Einasto, Peeter Tenjes, Rain Kipper +6
We study the substructure, connectivity, and galaxy content of galaxy clusters A1656 and 1367 in the Coma supercluster and of A1185 in the Leo supercluster with the aim of understa…
The Origin of Lopsided Satellite Galaxy Distribution in Galaxy Pairs
Chen Chris Gong, Noam I Libeskind, Elmo Tempel +6
It is well known that satellite galaxies are not isotropically distributed among their host galaxies as suggested by most interpretations of the CDM model. One type of anisotro…
The undiscovered ultra-diffuse galaxies of the Local Group
Oliver Newton, Arianna Di Cintio, Salvador Cardona-Barrero +6
Ultra-diffuse galaxies (UDGs) are attractive candidates to probe cosmological models and test theories of galaxy formation at low masses; however, they are difficult to detect beca…
Anatomy of luminosity functions: the 2dFGRS example
Elmo Tempel, Jaan Einasto, Maret Einasto +2
Aims. We use the 2dF Galaxy Redshift Survey to derive the luminosity function (LF) of the first-ranked (brightest) group/cluster galaxies, the LF of second-ranked, satellite and is…
Infalling groups and galaxy transformations in the cluster A2142
Maret Einasto, Boris Deshev, Heidi Lietzen +7
We study galaxy populations and search for possible merging substructures in the rich galaxy cluster A2142. Normal mixture modelling revealed in A2142 several infalling galaxy grou…
Portrait of a Galaxy on FIRE: Is the -bimodality a natural consequence of inside-out disc growth in a hierarchical formation scenario?
MarÃa Benito, Annaliina Aavik, Giuseppina Battaglia +7
The chemical dichotomy in the [/Fe]-[Fe/H] plane is a consequence of the complex processes underlying the formation and evolution of disc galaxies such as observed in the stell…
Line-of-sight velocity dispersions and a mass distribution model of the Sa galaxy NGC 4594
Elmo Tempel, Peeter Tenjes
In the present paper we develop an algorithm allowing to calculate line-of-sight velocity dispersions in an axisymmetric galaxy outside of the galactic plane. When constructing a s…
Anisotropic satellite accretion onto the Local Group with HESTIA
Alexandra Dupuy, Noam I. Libeskind, Yehuda Hoffman +9
How the cosmic web feeds halos, and fuels galaxy formation is an open question with wide implications. This study explores the mass assembly in the Local Group within the context o…