561 citations · 6.8k across the 180 of their papers we have counts for
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Supernovae Ia ejecta velocities and host galaxy environments: the role of survey-selection effects
L. V. Barkhudaryan, A. A. Hakobyan, M. H. Gevorgyan +6
The origin of the near-maximum-light Si II 6355 velocity diversity among supernovae Ia (SNe Ia) remains uncertain. Previous studies have suggested that high-velocity (HV) and no…
Calcium versus silicon ejecta velocities and decline rates in supernovae Ia: The role of high-velocity features
A. A. Hakobyan, M. H. Gevorgyan, A. G. Karapetyan +4
Photospheric and high-velocity features (PVFs and HVFs) of Si II 6355 and Ca II IR3 lines in supernova Ia (SN Ia) spectra provide insights into ejecta structure, energetics, and…
HSTPROMO Internal Proper Motion Kinematics of Dwarf Spheroidal Galaxies: I. Velocity Anisotropy and Dark Matter Cusp Slope of Draco
Eduardo Vitral, Roeland P. van der Marel, Sangmo Tony Sohn +8
We analyze four epochs of HST imaging over 18 years for the Draco dwarf spheroidal galaxy. We measure precise proper motions (PMs) for hundreds of stars and combine these with exis…
Are compact groups of galaxies special?
Matthieu Tricottet, Gary A. Mamon, Eugenia Díaz-Giménez
It is often believed that isolated compact groups (CGs) of galaxies are special systems, but only a few studies have compared CGs to regular groups. We study the global properties…
What drives the corpulence of galaxies? I. The formation of central compact dwarf galaxies in TNG50
Abhner P. De Almeida, Gary A. Mamon, Avishai Dekel +1
Nearby dwarf galaxies display a variety of effective radii (sizes) at a given stellar mass, suggesting different evolution scenarios according to their final "stellar" size. The TN…
AXES-2MRS: A new all-sky catalogue of extended X-ray galaxy groups
H. Khalil, A. Finoguenov, E. Tempel +1
We present a new all-sky catalogue of X-ray detected groups (AXES-2MRS), based on the identification of large X-ray sources found in the ROSAT All-Sky Survey (RASS) with the Two Mi…
AXES-SDSS: comparison of SDSS galaxy groups with all-sky X-ray extended sources
S. Damsted, A. Finoguenov, H. Lietzen +8
We revisit the picture of X-ray emission of groups through the study of systematic differences in the optical properties of groups with and without X-ray emission and study the eff…
Compact groups of dwarf galaxies in TNG50: late hierarchical assembly and delayed stellar build-up in the low-mass regime
Rodrigo Flores-Freitas, Marina Trevisan, Maitê Mückler +3
Compact groups of dwarf galaxies (CGDs) have been observed at low redshifts () and are direct evidence of hierarchical assembly at low masses. To understand the formation of…
The Accretion History of the Milky Way: III. Hydrodynamical Simulations of Galactic Dwarf Galaxies at First Infall
Jianling Wang, Francois Hammer, Yanbin Yang +3
Most Milky Way dwarf galaxies are much less bound to their host than are relics of Gaia-Sausage-Enceladus and Sgr. These dwarfs are expected to have fallen into the Galactic halo l…
The accretion history of the Milky Way. II. Internal kinematics of globular clusters and of dwarf galaxies
Francois Hammer, Jianling Wang, Gary A. Mamon +7
We study how structural properties of globular clusters and dwarf galaxies are linked to their orbits in the Milky Way halo. From the inner to the outer halo, orbital energy increa…
Compact groups from semi-analytical models of galaxy formation -- IV: effect of group assembly on the evolution of their galaxies
Ariel Zandivarez, Eugenia Diaz-Gimenez, Antonela Taverna +1
Using over 3000 compact groups (CGs) of galaxies extracted from mock catalogues built from semi-analytical models of galaxy formation (SAMs), we study whether the CG assembly chann…
An elusive dark central mass in the globular cluster M4
Eduardo Vitral, Mattia Libralato, Kyle Kremer +4
Recent studies of nearby globular clusters have discovered excess dark mass in their cores, apparently in an extended distribution, and simulations indicate that this mass is compo…
The accretion history of the Milky Way. I. How it shapes globular clusters and dwarf galaxies
Francois Hammer, Hefan Li, Gary A. Mamon +6
Halo inhabitants are individual stars, stellar streams, star and globular clusters, and dwarf galaxies. Here we compare the two last categories that include objects of similar stel…
Stellar graveyards: Clustering of compact objects in globular clusters NGC 3201 and NGC 6397
Eduardo Vitral, Kyle Kremer, Mattia Libralato +2
We analyse Gaia EDR3 and re-calibrated HST proper motion data from the core-collapsed and non core-collapsed globular clusters NGC 6397 and NGC 3201, respectively, with the Bayesia…
Compact groups from semi-analytical models of galaxy formation -- III: purity and completeness of Hickson-like catalogues
Antonela Taverna, Eugenia Diaz-Gimenez, Ariel Zandivarez +1
Many catalogues of isolated compact groups of galaxies (CGs) have been extracted using Hickson's criteria to identify isolated, dense systems of galaxies, with at least three or fo…
Compact groups from semi-analytical models of galaxy formation -- II: Different assembly channels
Eugenia Diaz-Gimenez, Ariel Zandivarez, Gary Mamon
We study the formation of over 6000 compact groups (CGs) of galaxies identified in mock redshift-space galaxy catalogues built from semi-analytical models of galaxy formation (SAMs…
The properties and environment of very young galaxies in the local Universe
M. Trevisan, G. A. Mamon, T. X. Thuan +3
In the local Universe, there is a handful of dwarf compact star-forming galaxies with extremely low oxygen abundances. It has been proposed that they are young, having formed a lar…
Bulge formation through disc instability -- I
Timothée Devergne, Andrea Cattaneo, Frédéric Bournaud +6
We use simulations to study the growth of a pseudobulge in an isolated thin exponential stellar disc embedded in a static spherical halo. We observe a transition from later to earl…
Breaking Beta: A comparison of mass modelling methods for spherical systems
J. I. Read, G. A. Mamon, E. Vasiliev +6
We apply four different mass modelling methods to a suite of publicly available mock data for spherical stellar systems. We focus on the recovery of the density and velocity anisot…
Does NGC 6397 contain an intermediate-mass black hole or a more diffuse inner subcluster?
Eduardo Vitral, Gary A. Mamon
We analyze proper motions from the Hubble Space Telescope (HST) and the second Gaia data release along with line-of-sight velocities from the MUSE spectrograph to detect imprints o…
Supernovae and their host galaxies -- VII. The diversity of Type Ia supernova progenitors
A. A. Hakobyan, L. V. Barkhudaryan, A. G. Karapetyan +5
We present an analysis of the light curve (LC) decline rates of 407 normal and peculiar supernovae (SNe) Ia and global parameters of their host galaxies. As previously…
Double-peak emission line galaxies in the SDSS catalogue. A minor merger sequence
Daniel Maschmann, Anne-Laure Melchior, Gary A. Mamon +2
Mergers can be detected as double-peak narrow emission line galaxies but they are difficult to disentangle from disc rotations and gas outflows. We aim to properly detect such gala…
SPIDERS: overview of the X-ray galaxy cluster follow-up and the final spectroscopic data release
N. Clerc, C. C. Kirkpatrick, A. Finoguenov +19
SPIDERS (The SPectroscopic IDentification of eROSITA Sources) is a large spectroscopic programme for X-ray selected galaxy clusters as part of the Sloan Digital Sky Survey-IV (SDSS…
A Precise Analytical Approximation for the Deprojection of the Sérsic Profile
Eduardo Vitral, Gary A. Mamon
The Sérsic model is known to fit well the surface brightness (or surface density) profiles of elliptical galaxies and galaxy bulges, and possibly for dwarf spheroidal galaxies and…