Search Publications
Tracing Hercules in Galactic azimuth with Gaia DR2
Monari, G.; Siebert, A.; Famaey, B. +4 more
The second data release of the Gaia mission has revealed, in stellar velocity and action space, multiple ridges, the exact origin of which is still debated. Recently, we demonstrated that a large Galactic bar with pattern speed 39 km s-1 kpc-1 creates most of the observed ridges. Among these ridges, the Hercules moving group …
Star-forming clumps in the Lyman Alpha Reference Sample of galaxies - I. Photometric analysis and clumpiness
Hayes, Matthew; Östlin, Göran; Melinder, Jens +4 more
We study young star-forming clumps on physical scales of 10-500 pc in the Lyman-Alpha Reference Sample (LARS), a collection of low-redshift (z = 0.03-0.2) UV-selected star-forming galaxies. In each of the 14 galaxies of the sample, we detect clumps for which we derive sizes and magnitudes in five UV-optical filters. The final sample includes ∼1400…
Mean density inversions for red giants and red clump stars
Reese, D. R.; Eggenberger, P.; Bossini, D. +8 more
Since the CoRoT and Kepler missions, the availability of high-quality seismic spectra for red giants has made them the standard clocks and rulers for Galactic Archeology. With the expected excellent data from the TESS and PLATO missions, red giants will again play a key role in Galactic studies and stellar physics, thanks to the precise masses and…
Organic molecules in the protoplanetary disk of DG Tauri revealed by ALMA
Kamp, I.; Podio, L.; Bacciotti, F. +10 more
Context. Planets form in protoplanetary disks and inherit their chemical compositions.
Aims: It is thus crucial to map the distribution and investigate the formation of simple organics, such as formaldehyde and methanol, in protoplanetary disks.
Methods: We analyze ALMA observations of the nearby disk-jet system around the T Tauri star D…
A Secondary Fan-spine Magnetic Structure in Active Region 11897
Hou, Yijun; Li, Ting; Yang, Shuhong +1 more
Fan-spine is a special topology in solar atmosphere and is closely related to magnetic null point, as well as circular-ribbon flares, which can provide important information for understanding the intrinsic 3D nature of solar flares. However, the fine structure within the fan has rarely been investigated. In present paper, we investigate a secondar…
Discovery of a galaxy overdensity around a powerful, heavily obscured FRII radio galaxy at z = 1.7: star formation promoted by large-scale AGN feedback?
Prandoni, I.; Vignali, C.; Gilli, R. +25 more
We report the discovery of a galaxy overdensity around a Compton-thick Fanaroff-Riley type II (FRII) radio galaxy at z = 1.7 in the deep multiband survey around the z = 6.3 quasi-stellar object (QSO) SDSS J1030+0524. Based on a 6 h VLT/MUSE and on a 4 h LBT/LUCI observation, we identify at least eight galaxy members in this structure with spectros…
A Light-curve Analysis of 32 Recent Galactic Novae: Distances and White Dwarf Masses
Kato, Mariko; Hachisu, Izumi
We obtained the absolute magnitudes, distances, and white dwarf (WD) masses of 32 recent galactic novae based on the time-stretching method for nova light curves. A large part of the light/color curves of two classical novae often overlap each other if we properly squeeze/stretch their timescales. Then, a target nova brightness is related to the o…
JINGLE - V. Dust properties of nearby galaxies derived from hierarchical Bayesian SED fitting
Lamperti, Isabella; Saintonge, Amélie; Clark, Christopher J. R. +18 more
We study the dust properties of 192 nearby galaxies from the JINGLE survey using photometric data in the 22-850 µm range. We derive the total dust mass, temperature T, and emissivity index β of the galaxies through the fitting of their spectral energy distribution (SED) using a single modified blackbody model (SMBB). We apply a hierarchical …
Search for Gravitational-wave Signals Associated with Gamma-Ray Bursts during the Second Observing Run of Advanced LIGO and Advanced Virgo
Lee, H. M.; Williams, D.; Hurley, K. +1196 more
We present the results of targeted searches for gravitational-wave transients associated with gamma-ray bursts during the second observing run of Advanced LIGO and Advanced Virgo, which took place from 2016 November to 2017 August. We have analyzed 98 gamma-ray bursts using an unmodeled search method that searches for generic transient gravitation…
Mass modelling globular clusters in the Gaiaera: a method comparison using mock data from an N-body simulation of M 4
Pancino, E.; Hénault-Brunet, V.; Gieles, M. +5 more
As we enter a golden age for studies of internal kinematics and dynamics of Galactic globular clusters (GCs), it is timely to assess the performance of modelling techniques in recovering the mass, mass profile, and other dynamical properties of GCs. Here, we compare different mass-modelling techniques (distribution function (DF)-based models, Jean…