Search Publications
Probing star formation and ISM properties using galaxy disk inclination. I. Evolution in disk opacity since z 0.7
Smolčić, V.; Sargent, M. T.; Schinnerer, E. +6 more
Disk galaxies at intermediate redshift (z 0.7) have been found in previous work to display more optically thick behaviour than their local counterparts in the rest-frame B-band surface brightness, suggesting an evolution in dust properties over the past 6 Gyr. We compare the measured luminosities of face-on and edge-on star-forming galaxies at dif…
Gaia Data Release 2. Short-timescale variability processing and analysis
Audard, M.; Rimoldini, L.; Holl, B. +13 more
Aims: We describe the methods used and the analysis performed in the frame of the Gaia data processing activities to produce the Gaia Data Release 2 (DR2) sample candidates with short-timescale variability together with associated parameters.
Methods: The Gaia DR2 sample of candidates with short-timescale variability results from the inv…
A detailed X-ray investigation of ζ Puppis. IV. Further characterization of the variability
Moffat, Anthony F. J.; Stevens, Ian R.; Nazé, Yaël +2 more
Context. One of the optically brightest and closest massive stars, ζ Pup, is also a bright X-ray source. Previously, its X-ray emission was found to be variable with light curves harbouring "trends" with a typical timescale longer than the exposure length, i.e. >1 d. The origin of these changes was proposed to be linked to large-scale structure…
Model-independent and model-based local lensing properties of CL0024+1654 from multiply imaged galaxies
Liesenborgs, Jori; Wagner, Jenny; Tessore, Nicolas
Context. Local gravitational lensing properties, such as convergence and shear, determined at the positions of multiply imaged background objects, yield valuable information on the smaller-scale lensing matter distribution in the central part of galaxy clusters. Highly distorted multiple images with resolved brightness features like the ones obser…
Chemical analysis of very metal-poor turn-off stars from SDSS-DR12
Salvadori, S.; Bonifacio, P.; Caffau, E. +8 more
Context. The most metal-poor stars are the relics of the early chemical evolution of the Galaxy. Their chemical composition is an important tool to constrain the nucleosynthesis in the first generation of stars. The aim is to observe a sample of extremely metal-poor star (EMP stars) candidates selected from the Sloan Digital Sky Survey Data Releas…
Spectral analysis of four surprisingly similar hot hydrogen-rich subdwarf O stars
Latour, M.; Chayer, P.; Green, E. M. +2 more
Context. Post-extreme horizontal branch stars (post-EHB) are helium-shell burning objects evolving away from the EHB and contracting directly towards the white dwarf regime. While the stars forming the EHB have been extensively studied in the past, their hotter and more evolved progeny are not so well characterized.
Aims: We perform a compreh…
The XXL Survey. XIX. A realistic population of simulated X-ray AGN: Comparison of models with observations
Paltani, S.; Lidman, C.; Pierre, M. +11 more
Modern cosmological simulations heavily rely on feedback from active galactic nuclei (AGN) in order to stave off overcooling in massive galaxies, and galaxy groups and clusters. Given that AGN are a key component of such simulations, an important independent test is whether or not the simulations capture the broad demographics of the observed AGN …
Impact of gaps in the asteroseismic characterization of pulsating stars. I. The efficiency of pre-whitening
Garrido, R.; Moya, A.; Suárez, J. C. +4 more
Context. It is known that the observed distribution of frequencies in CoRoT and Kepler δ Scuti stars has no parallelism with any theoretical model. Pre-whitening is a widespread technique in the analysis of time series with gaps from pulsating stars located in the classical instability strip, such as δ Scuti stars. However, some studies have point…
Hidden molecular outflow in the LIRG Zw 049.057
Gallagher, J. S.; González-Alfonso, E.; Privon, G. C. +8 more
Context. Feedback in the form of mass outflows driven by star formation or active galactic nuclei is a key component of galaxy evolution. The luminous infrared galaxy Zw 049.057 harbours a compact obscured nucleus with a possible far-infrared signature of outflowing molecular gas. Due to the high optical depths at far-infrared wavelengths, however…
An outflow in the Seyfert ESO 362-G18 revealed by Gemini-GMOS/IFU observations
Robinson, Andrew; Fischer, Travis C.; Schnorr-Müller, Allan +14 more
We present two-dimensional stellar and gaseous kinematics of the inner 0.7 × 1.2 kpc2 of the Seyfert 1.5 galaxy ESO 362-G18, derived from optical (4092-7338 Å) spectra obtained with the GMOS integral field spectrograph on the Gemini South telescope at a spatial resolution of ≈170 pc and spectral resolution of 36 km s-1. ESO 3…