Search Publications
Hubble Asteroid Hunter. II. Identifying strong gravitational lenses in HST images with crowdsourcing
Bhatawdekar, Rachana; Merín, Bruno; Kruk, Sandor +3 more
Context. The Hubble Space Telescope (HST) archives constitute a rich dataset of high-resolution images to mine for strong gravitational lenses. While many HST programmes specifically target strong lenses, they can also be present by coincidence in other HST observations.
Aims: Our aim is to identify non-targeted strong gravitational lenses, w…
The earliest O-type eclipsing binary in the Small Magellanic Cloud, AzV 476: A comprehensive analysis reveals surprisingly low stellar masses
Hamann, W. -R.; Oskinova, L. M.; Sander, A. A. C. +7 more
Context. Massive stars at low metallicity are among the main feedback agents in the early Universe and in present-day star forming galaxies. When in binaries, these stars are potential progenitors of gravitational-wave events. Knowledge of stellar masses is a prerequisite to understanding evolution and feedback of low-metallicity massive stars.
ShapePipe: A new shape measurement pipeline and weak-lensing application to UNIONS/CFIS data
Mellier, Yannick; Van Waerbeke, Ludovic; Cuillandre, Jean-Charles +17 more
Context. The Ultraviolet Near-Infrared Optical Northern Survey (UNIONS) is an ongoing collaboration that will provide the largest deep photometric survey of the northern sky in four optical bands to date. As part of this collaboration, the Canada-France Imaging Survey (CFIS) is observing r-band data with an average seeing of 0.65 arcsec, which is …
Chemical Evolution of R-process Elements in Stars (CERES). I. Stellar parameters and chemical abundances from Na to Zr
Hanke, Michael; Bonifacio, Piercarlo; Caffau, Elisabetta +10 more
Aims: The Chemical Evolution of R-process Elements in Stars (CERES) project aims to provide a homogeneous analysis of a sample of metal-poor stars ([Fe/H] < -1.5). We present the stellar parameters and the chemical abundances of elements up to Zr for a sample of 52 giant stars.
Methods: We relied on a sample of high signal-to-noise UV…
Forward fitting STIX visibilities
Volpara, Anna; Massa, Paolo; Krucker, Säm +6 more
Aims: We seek to determine to what extent the problem of forward fitting visibilities measured by the Spectrometer/Telescope Imaging X-rays (STIX) on board Solar Orbiter becomes more challenging with respect to the same problem in the case of previous hard X-ray solar imaging missions. In addition, we aim to identify an effective optimization…
HI-H2 transition: Exploring the role of the magnetic field. A case study toward the Ursa Major cirrus
Blinov, D.; Panopoulou, G. V.; Gong, Y. +6 more
Context. Atomic gas in the diffuse interstellar medium (ISM) is organized in filamentary structures. These structures usually host cold and dense molecular clumps. The Galactic magnetic field is considered to play an important role in the formation of these clumps.
Aims: Our goal is to explore the role of the magnetic field in the HI
XXL-HSC: Link between AGN activity and star formation in the early Universe (z ⩾ 3.5)
Paltani, S.; Pierre, M.; Vignali, C. +11 more
In this work, our aim is to investigate the star formation rate (SFR) of the host galaxies of active galactic nuclei (AGNs) in the early Universe. To this end, we constructed a sample of 149 luminous (L2 − 10 keV > 1044 erg s−1) X-ray AGNs at z ≥ 3.5 selected in three fields with different depths and observed ar…
Gaia-ESO Survey: Role of magnetic activity and starspots on pre-main-sequence lithium evolution
Gilmore, G.; Montes, D.; de Laverny, P. +24 more
Context. It is now well-known that pre-main-sequence models with inflated radii should be taken into account to simultaneously reproduce the colour-magnitude diagram and the lithium depletion pattern observed in young open star clusters.
Aims: We tested a new set of pre-main-sequence models that include radius inflation due to the presence of…
Linking a universal gas density profile to the core-excised X-ray luminosity in galaxy clusters up to z ∼ 1.1
Arnaud, M.; Pratt, G. W.; Maughan, B. J. +1 more
We investigate the regularity of galaxy cluster gas density profiles and the link to the relation between core-excised luminosity, LXc, and mass from the YX proxy, MYX, for 93 objects selected through their Sunyaev-Zeldovich effect (SZE) signal. The sample spans a mass range of M500 = [0.5−20]…
Influence of grain growth on CO2 ice spectroscopic profiles. Modelling for dense cores and disks
Ysard, N.; Dartois, E.; Noble, J. A. +2 more
Context. Interstellar dust grain growth in dense clouds and protoplanetary disks, even when moderate, affects the observed interstellar ice profiles as soon as a significant fraction of dust grains are in the size range close to the wave vector at the considered wavelength. The continuum baseline correction made prior to analysing ice profiles inf…