Search Publications
X-ray obscuration from a variable ionized absorber in PG 1114+445
Piconcelli, E.; Gaspari, M.; Tombesi, F. +9 more
Photoionized absorbers of outflowing gas are commonly found in the X-ray spectra of active galactic nuclei. While most of these absorbers are seldom significantly variable, some ionized obscurers have increasingly been found to substantially change their column density on a wide range of timescales. These NH variations are often conside…
LOFAR properties of SILVERRUSH Lyα emitter candidates in the ELAIS-N1 field
Bondi, M.; Prandoni, I.; Wang, L. +12 more
Lyman alpha emitters (LAEs) in the Epoch of Reionization (EoR) offer valuable probes of both early galaxy evolution and the process of reionization itself; however, the exact evolution of their abundance and the nature of their emission remain open questions. We combine samples of 229 and 349 LAE candidates at z = 5.7 and z = 6.6, respectively, fr…
Improving the astrometric solution of the Hyper Suprime-Cam with anisotropic Gaussian processes
Rubin, D.; Astier, P.; Roodman, A. +5 more
Context. We study astrometric residuals from a simultaneous fit of Hyper Suprime-Cam images.
Aims: We aim to characterize these residuals and study the extent to which they are dominated by atmospheric contributions for bright sources.
Methods: We used Gaussian process interpolation with a correlation function (kernel) measured from the …
Gemini/Phoenix H-band analysis of the globular cluster AL 3
Minniti, D.; Zoccali, M.; Bica, E. +9 more
Context. The globular cluster AL 3 is old and located in the inner bulge. Three individual stars were observed with the Phoenix spectrograph at the Gemini South telescope. The wavelength region contains prominent lines of CN, OH, and CO, allowing the derivation of C, N, and O abundances of cool stars.
Aims: We aim to derive C, N, O abundances…
VEXAS: VISTA EXtension to Auxiliary Surveys. Data Release 2: Machine-learning based classification of sources in the Southern Hemisphere
Agnello, A.; Spiniello, C.; Khramtsov, V. +1 more
Context. We present the second public data release of the VISTA EXtension to Auxiliary Surveys (VEXAS), where we classify objects into stars, galaxies, and quasars based on an ensemble of machine learning algorithms.
Aims: The aim of VEXAS is to build the widest multi-wavelength catalogue, providing reference magnitudes, colours, and morpholo…
Non-synchronous rotations in massive binary systems. II. The case of HD 96264A
Gamen, R.; Barbá, R. H.; Morrell, N. I. +3 more
Context. The OWN Survey has detected several O-type stars with composite spectra whose individual components show very different line broadening. Some of these stars have been revealed as binary systems whose components are asynchronous. This fact may be related to the processes acting in these systems (e.g., angular-momentum transfer, tidal force…
The OTELO survey. Faint end of the luminosity function of [O II]3727 emitters at ⟨z⟩ = 1.43
Cepa, J.; Pérez García, A. M.; Alfaro, E. J. +15 more
Aims: In this paper, we aim to study the main properties and luminosity function (LF) of the [O II]3727 emitters detected in the OTELO survey in order to characterise the star formation processes in low-mass galaxies at z ∼ 1.43 and to constrain the faint-end of the LF.
Methods: Here, we describe the selection method and analysis of the …
Imaging from STIX visibility amplitudes
Massa, Paolo; Krucker, Säm; Piana, Michele +5 more
Aims: This study is aimed at providing the first demonstration of STIX Fourier-transform X-ray imaging using semi-calibrated (amplitude-only) visibility data acquired during Solar Orbiter's cruise phase.
Methods: We used a parametric imaging approach whereby STIX visibility amplitudes are fitted by means of two non-linear optimization me…
A lighter core for Phobos?
Li, Fei; Pätzold, Martin; Yan, Jianguo +7 more
Context. The origin of the Martian moons Phobos and Deimos is still poorly understood, and is the focus of intense debate.
Aims: We demonstrate that a stratified internal structure of Phobos is compatible with the observed gravity coefficients.
Methods: We fit previously derived C20 and C22 Phobos gravity coefficien…
Environments of a sample of AzTEC submillimetre galaxies in the COSMOS field
Finoguenov, A.; Aravena, M.; Barrufet, L. +2 more
Aims: Submillimetre galaxies (SMGs) are bright sources at submillimetre wavelengths (F850 µm > 2-5 mJy). Made up of mostly of high-z galaxies (z > 1), SMGs are amongst the most luminous dusty galaxies in the Universe. These galaxies are thought to be the progenitors of the massive elliptical galaxies in the local Univer…