Search Publications
OMEGA-OSIRIS mapping of emission-line galaxies in A901/2-V. The rich population of jellyfish galaxies in the multicluster system Abell 901/2
Chies-Santos, Ana L.; Aragón-Salamanca, A.; Bamford, Steven P. +3 more
We present the results of a systematic search and characterization of galaxies with morphological signatures of ram pressure stripping, known as jellyfish galaxies, in the multicluster system A901/2, at z ∼ 0.165, as part of the OMEGA survey. By visually inspecting Advanced Camera for Surveys/Hubble Space Telescope F606W images looking for morphol…
Investigating the diversity of Type Ia supernova spectra with the open-source relational data base KAEPORA
Foley, R. J.; Jones, D. O.; Siebert, M. R. +10 more
We present a public, open-source relational data base (we name KAEPORA) containing a sample of 4975 spectra of 777 Type Ia supernovae (SNe Ia). Since we draw from many sources, we significantly improve the spectra by inspecting these data for quality, removing galactic emission lines and cosmic rays, generating variance spectra, and correcting for…
Three new Galactic star clusters discovered in the field of the open cluster NGC 5999 with Gaia DR2
Corradi, W. J. B.; Ferreira, Filipe A.; Santos, J. F. C. +2 more
We report the serendipitous discovery of three new open clusters, named UFMG 1, UFMG 2, and UFMG 3 in the field of the intermediate-age cluster NGC 5999, by using Gaia DR2 data. A colour-magnitude filter tailored for a proper selection of main-sequence stars and red clump giants turned evident the presence of NGC 5999 and these three new stellar g…
The white dwarf mass-radius relation and its dependence on the hydrogen envelope
Kepler, S. O.; Romero, Alejandra D.; Joyce, S. R. G. +2 more
We present a study of the dependence of the mass-radius relation for DA white dwarf stars on the hydrogen envelope mass and the impact on the value of log g, and thus the determination of the stellar mass. We employ a set of full evolutionary carbon-oxygen core white dwarf sequences with white dwarf mass between 0.493 and 1.05 M⊙. Compu…
A stellar relic filament in the Orion star-forming region
Anderson, Richard I.; Boffin, Henri M. J.; Jerabkova, Tereza +1 more
We report the discovery of the oldest stellar substructure in the Orion star-forming region (OSFR), the Orion relic filament. The relic filament is physically associated with the OSFR, as demonstrated by Gaia DR2 photometry and astrometry, as well as by targeted radial velocity follow-up observations of a bright subsample of proper motion-selected…
HST unveils a compact mildly relativistic broad-line region in the candidate true type 2 NGC 3147
Laor, Ari; Bianchi, Stefano; La Franca, Fabio +9 more
NGC 3147 has been considered the best case of a true type 2 AGN: an unobscured AGN, based on the unabsorbed compact X-ray continuum, which lacks a broad-line region (BLR). However, the very low luminosity of NGC 3147 implies a compact BLR, which produces very broad lines, hard to detect against the dominant background host galaxy. Narrow (0.1 arcs…
Gaia stellar kinematics in the head of the Orion A cloud: runaway stellar groups and gravitational infall
Garmire, G. P.; Getman, K. V.; Kuhn, M. A. +1 more
This work extends previous kinematic studies of young stars in the head of the Orion A cloud (OMC-1/2/3/4/5). It is based on large samples of infrared, optical, and X-ray selected pre-main-sequence stars with reliable radial velocities and Gaia-derived parallaxes and proper motions. Stellar kinematic groups are identified assuming they mimic the m…
Nine tiny star clusters in Gaia DR1, PS1, and DES
Belokurov, V.; Koposov, S. E.; Torrealba, G.
We present the results of a systematic Milky Way satellite search performed across an array of publicly available wide-area photometric surveys. Our aim is to complement previous searches by widening the parameter space covered. Specifically, we focus on objects smaller than 1 arcmin and include old, young, metal-poor, and metal-rich stellar popul…
Nature versus nurture: what regulates star formation in satellite galaxies?
Hirschmann, Michaela; De Lucia, Gabriella; Fontanot, Fabio
We use our state-of-the-art Galaxy Evolution and Assembly (GAEA) semi-analytic model to study how and on which time-scales star formation is suppressed in satellite galaxies. Our fiducial stellar feedback model, implementing strong stellar driven outflows, reproduces relatively well the variations of passive fractions as a function of galaxy stell…
The velocity anisotropy of the Milky Way satellite system
Grand, Robert J. J.; Gómez, Facundo A.; Fattahi, Azadeh +9 more
We analyse the orbital kinematics of the Milky Way (MW) satellite system utilizing the latest systemic proper motions for 38 satellites based on data from Gaia Data Release 2. Combining these data with distance and line-of-sight velocity measurements from the literature, we use a likelihood method to model the velocity anisotropy, β, as a function…