Velocity dispersion
View article
The APOSTLE simulations: solutions to the Local Group's cosmic puzzles Open
The Local Group galaxies offer some of the most discriminating tests of models of cosmic structure formation. For example, observations of the Milky Way (MW) and Andromeda satellite populations appear to be in disagreement with N-body simu…
View article
A catalogue of masses, structural parameters, and velocity dispersion profiles of 112 Milky Way globular clusters Open
We have determined masses, stellar mass functions and structural parameters\nof 112 Milky Way globular clusters by fitting a large set of N-body simulations\nto their velocity dispersion and surface density profiles. The velocity\ndispersi…
View article
The 2dF galaxy redshift survey: The environmental dependence of galaxy star formation rates near clusters Open
We have measured the equivalent width of the Ha emission line for 11 006 galaxies brighter than Mb, = -19 (ΩΛ = 0.7, Ωm = 0.3, H0 = 70 km s-1 Mpc-1) at 0.05 < z < 0.1 in the 2dF Galaxy Redshift Survey (2dFGRS), in the fields of 17 known ga…
View article
Mean proper motions, space orbits, and velocity dispersion profiles of Galactic globular clusters derived from<i>Gaia</i>DR2 data Open
We have derived the mean proper motions and space velocities of 154 Galactic\nglobular clusters and the velocity dispersion profiles of 141 globular clusters\nbased on a combination of Gaia DR2 proper motions with ground-based\nline-of-sig…
View article
PHYSICAL PROPERTIES OF MOLECULAR CLOUDS FOR THE ENTIRE MILKY WAY DISK Open
This study presents a catalog of 8107 molecular clouds that covers the entire Galactic plane and includes 98% of the 12 CO emission observed within . The catalog was produced using a hierarchical cluster identification method applied to th…
View article
A unified model for galactic discs: star formation, turbulence driving, and mass transport Open
We introduce a new model for the structure and evolution of the gas in galactic discs. In the model the gas is in vertical pressure and energy balance. Star formation feedback injects energy and momentum, and non-axisymmetric torques preve…
View article
Proper motions and dynamics of the Milky Way globular cluster system from<i>Gaia</i>DR2 Open
We use Gaia Data Release 2 to determine the mean proper motions for 150 Milky\nWay globular clusters (almost the entire known population), with a typical\nuncertainty of 0.05 mas/yr limited mainly by systematic errors. Combining them\nwith…
View article
THE SINFONI BLACK HOLE SURVEY: THE BLACK HOLE FUNDAMENTAL PLANE REVISITED AND THE PATHS OF (CO)EVOLUTION OF SUPERMASSIVE BLACK HOLES AND BULGES Open
We investigate the correlations between the black hole (BH) mass M BH , the velocity dispersion σ , the bulge mass M Bu , the bulge average spherical density , and its spherical half-mass radius r h , constructing a database of 97 galaxies…
View article
Selection bias in dynamically measured supermassive black hole samples: its consequences and the quest for the most fundamental relation Open
We compare the set of local galaxies having dynamically measured black holes with a large, unbiased sample of galaxies extracted from the Sloan Digital Sky Survey. We confirm earlier work showing that the majority of black hole hosts have …
View article
The dragon simulations: globular cluster evolution with a million stars Open
Introducing the dragon simulation project, we present direct N-body simulations of four massive globular clusters (GCs) with 106 stars and 5 per cent primordial binaries at a high level of accuracy and realism. The GC evolution is computed…
View article
STRIDES: a 3.9 per cent measurement of the Hubble constant from the strong lens system DES J0408−5354 Open
We present a blind time-delay cosmographic analysis for the lens system DES J0408−5354. This system is extraordinary for the presence of two sets of multiple images at different redshifts, which provide the opportunity to obtain more infor…
View article
How stellar feedback simultaneously regulates star formation and drives outflows Open
Stellar-feedback-driven outflows are thought to be a crucial process in galaxy formation, but our physical understanding of them is still rudimentary. I will present an analytical model for how stellar feedback simultaneously regulates sta…
View article
DISCOVERY OF A GALAXY CLUSTER WITH A VIOLENTLY STARBURSTING CORE AT z = 2.506 Open
We report the discovery of a remarkable concentration of massive galaxies with extended X-ray emission at z spec = 2.506, which contains 11 massive ( M * ≳ 10 11 M ⊙ ) galaxies in the central 80 kpc region (11.6 σ overdensity). We have spe…
View article
The KMOS Redshift One Spectroscopic Survey (KROSS): dynamical properties, gas and dark matter fractions of typical<i>z</i>∼ 1 star-forming galaxies Open
The KMOS Redshift One Spectroscopic Survey (KROSS) is an ESO-guaranteed time survey of 795 typical star-forming galaxies in the redshift range z = 0.8–1.0 with the KMOS instrument on the Very Large Telescope. In this paper, we present reso…
View article
The apostle project: Local Group kinematic mass constraints and simulation candidate selection Open
We use a large sample of isolated dark matter halo pairs drawn from cosmological N-body simulations to identify candidate systems whose kinematics match that of the Local Group (LG) of galaxies. We find, in agreement with the ‘timing argum…
View article
A stellar census in globular clusters with MUSE: The contribution of rotation to cluster dynamics studied with 200 000 stars Open
This is the first of a series of papers presenting the results from our\nsurvey of 25 Galactic globular clusters with the MUSE integral-field\nspectrograph. In combination with our dedicated algorithm for source\ndeblending, MUSE provides …
View article
Galaxy Groups Within 3500 km s<sup>−1</sup> Open
A study of the group properties of galaxies in our immediate neighborhood provides a singular opportunity to observationally constrain the halo mass function, a fundamental characterization of galaxy formation. Detailed studies of individu…
View article
Molecular gas kinematics within the central 250 pc of the Milky Way Open
Using spectral line observations of HNCO, N2H+, and HNC, we investigate the kinematics of dense gas in the central ∼250 pc of the Galaxy. We present SCOUSE (Semi-automated multi-COmponent Universal Spectral-line fitting Engine), a line-fit…
View article
<i>N</i>-body modelling of globular clusters: masses, mass-to-light ratios and intermediate-mass black holes Open
We have determined the masses and mass-to-light ratios of 50 Galactic globular clusters by comparing their velocity dispersion and surface brightness profiles against a large grid of 900 N-body simulations of star clusters of varying initi…
View article
H0LiCOW – IV. Lens mass model of HE 0435−1223 and blind measurement of its time-delay distance for cosmology Open
Strong gravitational lenses with measured time delays between the multiple images allow a direct measurement of the time-delay distance to the lens, and thus a measure of cosmological parameters, particularly the Hubble constant, H0. We pr…
View article
Open cluster kinematics with <i>Gaia</i> DR2 Open
Context . Open clusters are very good tracers of the evolution of the Galactic disc. Thanks to Gaia , their kinematics can be investigated with an unprecedented precision and accuracy. Aims . The distribution of open clusters in the 6D pha…
View article
On the universality of interstellar filaments: theory meets simulations and observations Open
Filaments are ubiquitous in the Universe. Recent observations have revealed that stars and star clusters form preferentially along dense filaments. Understanding the formation and properties of filaments is therefore a crucial step in unde…
View article
Full spectrum fitting with photometry in <span>ppxf</span>: stellar population versus dynamical masses, non-parametric star formation history and metallicity for 3200 LEGA-C galaxies at redshift <i>z</i> ≈ 0.8 Open
I introduce some improvements to the ppxf method, which measures the stellar and gas kinematics, star formation history (SFH) and chemical composition of galaxies. I describe the new optimization algorithm that ppxf uses and the changes I …
View article
Estimating stellar birth radii and the time evolution of Milky Way’s ISM metallicity gradient Open
We present a semi-empirical, largely model-independent approach for estimating Galactic birth radii, r_birth, for Milky Way disk stars. The technique relies on the justifiable assumption that a negative radial metallicity gradient in the i…
View article
THE PREVALENCE OF GAS OUTFLOWS IN TYPE 2 AGNs Open
To constrain the nature and fraction of the ionized gas outflows in active galactic nuclei (AGNs), we perform a detailed analysis on gas kinematics as manifested by the velocity dispersion and shift of the λ 5007 emission line, using a lar…
View article
Paving the way for the JWST: witnessing globular cluster formation at z > 3 Open
We report on five compact, extremely young ( 3, elusive even in the deepest blank fields. We discuss how proto-GCs might contribute to the ionization budget of the Universe and augment Lyα visibility during reionization. This work underlin…
View article
Vertical disc heating in Milky Way-sized galaxies in a cosmological context Open
Vertically extended, high velocity dispersion stellar distributions appear to be a ubiquitous feature of disc galaxies, and both internal and external mechanisms have been proposed to be the major driver of their formation. However, it is …
View article
A Multimass Velocity Dispersion Model of 47 Tucanae Indicates No Evidence for an Intermediate-mass Black Hole Open
In this paper, we analyze stellar proper motions in the core of the globular cluster 47 Tucanae to explore the possibility of an intermediate-mass black hole (IMBH) influence on the stellar dynamics. Our use of short-wavelength photometry …
View article
GASP. IX. Jellyfish galaxies in phase-space: an orbital study of intense ram-pressure stripping in clusters Open
It is well known that galaxies falling into clusters can experience gas\nstripping due to ram-pressure by the intra-cluster medium (ICM). The most\nspectacular examples are galaxies with extended tails of optically-bright\nstripped materia…
View article
On the rate of black hole binary mergers in galactic nuclei due to dynamical hardening Open
We assess the contribution of dynamical hardening by direct three-body scattering interactions to the rate of stellar-mass black hole binary (BHB) mergers in galactic nuclei. We derive an analytic model for the single-binary encounter rate…