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22 papers · 2 filters
Predicting the hypervelocity star population in Gaia
T. Marchetti, O. Contigiani, E. M. Rossi +3
Hypervelocity stars (HVSs) are amongst the fastest objects in our Milky Way. These stars are predicted to come from the Galactic center (GC) and travel along unbound orbits across…
The Distance to NGC 4993: The Host Galaxy of the Gravitational-wave Event GW170817
Jens Hjorth, Andrew J. Levan, Nial R. Tanvir +6
The historic detection of gravitational waves from a binary neutron star merger (GW170817) and its electromagnetic counterpart led to the first accurate (sub-arcsecond) localizatio…
The XXL Survey: XXII. The XXL-North spectrophotometric sample and galaxy stellar mass function in X-ray detected groups and clusters
V. Guglielmo, B. M. Poggianti, B. Vulcani +42
The fraction of galaxies bound in groups in the nearby Universe is high (50% at z~0). Systematic studies of galaxy properties in groups are important in order to improve our unders…
LoCuSS: Pre-processing in galaxy groups falling into massive galaxy clusters at z=0.2
Matteo Bianconi, Graham P. Smith, Chris P. Haines +3
We report direct evidence of pre-processing of the galaxies residing in galaxy groups falling into galaxy clusters drawn from the Local Cluster Substructure Survey (LoCuSS). 34 gro…
Confirming chemical clocks: asteroseismic age dissection of the Milky Way disk(s)
V. Silva Aguirre, M. Bojsen-Hansen, D. Slumstrup +22
Investigations of the origin and evolution of the Milky Way disk have long relied on chemical and kinematic identification of its components to reconstruct our Galactic past. Diffi…
Post-Newtonian evolution of massive black hole triplets in galactic nuclei -- III. A robust lower limit to the nHz stochastic background of gravitational waves
Matteo Bonetti, Alberto Sesana, Enrico Barausse +1
Inspiraling massive black-hole binaries (MBHBs) forming in the aftermath of galaxy mergers are expected to be the loudest gravitational-wave (GW) sources relevant for pulsar-timing…
Post-Newtonian evolution of massive black hole triplets in galactic nuclei -- II. Survey of the parameter space
Matteo Bonetti, Francesco Haardt, Alberto Sesana +1
Massive black hole binaries (MBHBs) are expected to form at the centre of merging galaxies during the hierarchical assembly of the cosmic structure, and are expected to be the loud…
Ram pressure feeding super-massive black holes
Bianca M. Poggianti, Yara L. Jaffé, Alessia Moretti +10
When supermassive black holes at the center of galaxies accrete matter (usually gas), they give rise to highly energetic phenomena named Active Galactic Nuclei (AGN). A number of p…
The Complete Local Volume Groups Sample - I. Sample Selection and X-ray Properties of the High-Richness Subsample
Ewan O'Sullivan, Trevor J. Ponman, Konstantinos Kolokythas +7
We present the Complete Local-Volume Groups Sample (CLoGS), a statistically complete optically-selected sample of 53 groups within 80 Mpc. Our goal is to combine X-ray, radio and o…
The Local Nanohertz Gravitational-Wave Landscape From Supermassive Black Hole Binaries
Chiara M. F. Mingarelli, T. Joseph W. Lazio, Alberto Sesana +6
Supermassive black hole binaries (SMBHBs) in the 10 million to 10 billion range form in galaxy mergers, and live in galactic nuclei with large and poorly constrained conc…
No tension between assembly models of supermassive black hole binaries and pulsar observations
Hannah Middleton, Siyuan Chen, Walter Del Pozzo +2
Pulsar timing arrays (PTAs) are presently the only means to search for the gravitational wave stochastic background from supermassive black hole binary populations, considered to b…
The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the extended Baryon Oscillation Spectroscopic Survey and from the second phase of the Apache Point Observatory Galactic Evolution Experiment
Bela Abolfathi, D. S. Aguado, Gabriela Aguilar +344
The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since July 2014. This paper describes the second data release from this phase, and the fourtee…
Gemini Observations of Galaxies in Rich Early Environments (GOGREEN) I: Survey Description
Michael L. Balogh, David G. Gilbank, Adam Muzzin +29
We describe a new Large Program in progress on the Gemini North and South telescopes: Gemini Observations of Galaxies in Rich Early Environments (GOGREEN). This is an imaging and d…
Galaxy And Mass Assembly: search for a population of high-entropy galaxy groups
Richard J. Pearson, Trevor J. Ponman, Peder Norberg +7
Observations with the Chandra X-ray Observatory are used to examine the hot gas properties within a sample of 10 galaxy groups selected from the Galaxy And Mass Assembly survey's o…
The abundance of ultra-diffuse galaxies from groups to clusters: UDGs are relatively more common in more massive haloes
Remco F. J. van der Burg, Henk Hoekstra, Adam Muzzin +17
In recent years, multiple studies have reported substantial populations of large, low-surface-brightness galaxies in local galaxy clusters. Various theories that aim to explain the…
Kepler red-clump stars in the field and in open clusters: constraints on core mixing
D. Bossini, A. Miglio, M. Salaris +9
Convective mixing in Helium-core-burning (HeCB) stars is one of the outstanding issues in stellar modelling. The precise asteroseismic measurements of gravity-modes period spacing…
GASP I: Gas stripping phenomena in galaxies with MUSE
Bianca M. Poggianti, Alessia Moretti, Marco Gullieuszik +15
GASP (GAs Stripping Phenomena in galaxies with MUSE) is a new integral-field spectroscopic survey with MUSE at the VLT aiming at studying gas removal processes in galaxies. We pres…
GASP II. A MUSE view of extreme ram-pressure stripping along the line of sight: kinematics of the jellyfish galaxy JO201
C. Bellhouse, Y. L. Jaffe, G. K. T. Hau +11
This paper presents a spatially-resolved kinematic study of the jellyfish galaxy JO201, one of the most spectacular cases of ram-pressure stripping (RPS) in the GASP (GAs Stripping…
GASP III. JO36: a case of multiple environmental effects at play?
Jacopo Fritz, Alessia Moretti, Marco Gullieuszik +12
The so-called jellyfish galaxies are objects exhibiting disturbed morphology, mostly in the form of tails of gas stripped from the main body of the galaxy. Several works have stron…
Prospects for observing extreme-mass-ratio inspirals with LISA
Jonathan R Gair, Stanislav Babak, Alberto Sesana +5
One of the key astrophysical sources for the Laser Interferometer Space Antenna (LISA) are the inspirals of stellar-origin compact objects into massive black holes in the centres o…
The Hydrangea simulations: galaxy formation in and around massive clusters
Yannick M. Bahé, David J. Barnes, Claudio Dalla Vecchia +12
We introduce the Hydrangea simulations, a suite of 24 cosmological hydrodynamic zoom-in simulations of massive galaxy clusters (M_200c = 10^14-10^15 M_Sun) with baryon particle mas…
Superwind evolution: the young starburst-driven wind galaxy NGC 2782
Jimena Bravo-Guerrero, Ian R. Stevens
We present results from a 30 ksec Chandra observation of the important starburst galaxy NGC 2782, covering the 0.3-10keV energy band. We find evidence of a superwind of small exten…