Publications (29)
Faint galaxies in the Zone of Avoidance revealed by JWST/NIRCam
J. L. Nilo-Castellón, M. V. Alonso, L. Baravalle +12
The Zone of Avoidance (ZoA) remains one of the last frontiers in constructing a comprehensive three-dimensional map of the Universe. Galactic extinction, stellar crowding, and conf…
First direct detection of an exoplanet by optical interferometry; Astrometry and K-band spectroscopy of HR8799 e
S. Lacour, M. Nowak, J. Wang +85
To date, infrared interferometry at best achieved contrast ratios of a few times on bright targets. GRAVITY, with its dual-field mode, is now capable of high contrast obs…
A new hybrid gadolinium nanoparticles-loaded polymeric material for neutron detection in rare event searches
20k Collaboration, F. Acerbi, P. Adhikari +311
Experiments aimed at direct searches for WIMP dark matter require highly effective reduction of backgrounds and control of any residual radioactive contamination. In particular, ne…
GRAVITY chromatic imaging of Eta Car's core
GRAVITY Collaboration, J. Sanchez-Bermudez, G. Weigelt +132
Eta Car is one of the most intriguing luminous blue variables in the Galaxy. Observations and models at different wavelengths suggest a central binary with a 5.54 yr period residin…
Merging Binary Clusters
R. Hank Donnelly, W. Forman, C. Jones +4
We study three prominent bi-modal X-ray clusters: A3528, A1750 and A3395. Using observations taken with ROSAT and ASCA, we analyze the temperature and surface brightness distributi…
Differential cross sections of the charge-exchange reaction pi- p --> pi0 n in the momentum range from 103 to 178 MeV/c
D. MekteroviÄ, I. Supek, V. Abaev +40
Measured values of the differential cross sections for pion-nucleon charge exchange, pi- p --> pi0 n, are presented for pi- momenta of 103, 112, 120, 130, 139, 152, and 178 MeV/c.…
Benchmarking the design of the cryogenics system for the underground argon in DarkSide-20k
20k Collaboration, F. Acerbi, P. Adhikari +315
DarkSide-20k (DS-20k) is a dark matter detection experiment under construction at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It utilises ~100 t of low radioactivity a…
Sensitivity to low-mass WIMPs with an improved liquid argon ionization response model within the DarkSide programme
F. Acerbi, P. Adhikari, P. Agnes +294
Dark matter detection experiments using liquid argon rely on a precise characterization of the ionization response to nuclear recoils, especially in the keV energy range relevant f…
Witnessing the formation of a galaxy cluster at z=0.485: optical and X-ray properties of RX J1117.4+0743 ([VMF 98] 097)
E. R. Carrasco, E. S. Cypriano, G. B. Lima Neto +4
We present a multiwavelength study of the poor cluster RX J1117.4+0743 ([VMF 98] 097) at z=0.485, based on GMOS/Gemini South g', r' photometry and spectroscopy, and XMM-Newton obse…
Quality Assurance and Quality Control of the SiPM production for the DarkSide-20k dark matter experiment
F. Acerbi, P. Adhikari, P. Agnes +289
DarkSide-20k is a novel liquid argon dark matter detector currently under construction at the Laboratori Nazionali del Gran Sasso (LNGS) of the Istituto Nazionale di Fisica Nuclear…
Separating Ar from Ar by cryogenic distillation with Aria for dark matter searches
DarkSide Collaboration, P. Agnes, S. Albergo +309
The Aria project consists of a plant, hosting a 350 m cryogenic isotopic distillation column, the tallest ever built, which is currently in the installation phase in a mine shaft a…
Multiband Comparative Study of Optical Microvariability in RL vs. RQ Quasars
A. Ramirez, J. A. de Diego, D. Dultzin +1
We present the results of an optical multi-band (BVR) photometric monitoring program of 22 core-dominated radio-loud quasars (CRLQs) and 22 radio-quiet quasars (RQQs). The aim was…
Sensitivity projections for a dual-phase argon TPC optimized for light dark matter searches through the ionization channel
P. Agnes, I. Ahmad, S. Albergo +296
Dark matter lighter than 10 GeV/c encompasses a promising range of candidates. A conceptual design for a new detector, DarkSide-LowMass, is presented, based on the DarkSide-50…
A measure of the size of the magnetospheric accretion region in TW Hydrae
R. Garcia Lopez, A. Natta, A. Caratti o Garatti +69
Stars form by accreting material from their surrounding disks. There is a consensus that matter flowing through the disk is channelled onto the stellar surface by the stellar magne…
Flow and thermal modelling of the argon volume in the DarkSide-20k TPC
20k Collaboration, F. Acerbi, P. Adhikari +300
The DarkSide-20k dark matter experiment, currently under construction at LNGS, features a dual-phase time projection chamber (TPC) with a ~50 t argon target from an underground wel…
Optical Microvariability in Quasars: Spectral Variability
A. Ramirez, D. Dultzin, J. A. de Diego
We present a method that we developed to discern where the optical microvariability (OM) in quasars originates: in the accretion disk (related to thermal processes) or in the jet (…
eROSITA clusters dynamical state and their impact on the BCG luminosity
A. Zenteno, M. Kluge, R. Kharkrang +30
The Spectrum Roentgen Gamma/eROSITA first public release contains 12,247 clusters and groups. We use the offset between the Brightest Cluster Galaxy (BCG) and the X--ray peak (D$_{…
Production, Quality Assurance and Quality Control of the SiPM Tiles for the DarkSide-20k Time Projection Chamber
F. Acerbi, P. Adhikari, P. Agnes +301
The DarkSide-20k dark matter direct detection experiment will employ a 21 m^2 silicon photomultiplier (SiPM) array, instrumenting a dual-phase 50 tonnes liquid argon Time Projectio…
Investigation of monolayer-formation time for the synthesis of graphene on copper/nickel/silicon using very-low pressure pulses of methane
V-M. Freire, A. Ramirez, E. Pascual +2
Chemical Vapor Deposition (CVD) of graphene on copper is one of the most efficient technologies for producing high quality graphene for large areas. Nevertheless, still high pressu…
Optical variability of PKS 0736+017
A. Ramirez, J. A. de Diego, D. Dultzin-Hacyan +1
We present BVR photometric observations of the blazar PKS 0736+017. These observations were carried out with three telescopes in Mexico and two in Spain between December 1998 and A…
The GRAVITY fringe tracker
S. Lacour, R. Dembet, R. Abuter +17
The GRAVITY instrument has been commissioned on the VLTI during 2016 and is now available to the astronomical community. It is the first optical interferometer capable of observing…
The nature of nuclear Halpha emission in LINERs
J. Masegosa, I. Márquez, A. Ramirez +1
To get insight in the nature of the ionized gas in the nuclear region of LINERs we have performed a study of HST Halpha imaging of 32 LINERs. The main conclusion from this analysis…
DarkSide-20k sensitivity to light dark matter particles
20k Collaboration, F. Acerbi, P. Adhikari +310
The dual-phase liquid argon time projection chamber is presently one of the leading technologies to search for dark matter particles with masses below 10 GeV/c. This was demons…
The challenge of non-hermitian structures in physics
A. Ramirez, B. Mielnik
We present a brief review of physical problems leading to indefinite Hilbert spaces and non-hermitian Hamiltonians. With the exception of pseudo-Riemannian manifolds in GR, the pro…
The wind and the magnetospheric accretion onto the T Tauri star S Coronae Australis at sub-au resolution
R. Garcia Lopez, K. Perraut, A. Caratti o Garatti +70
To investigate the inner regions of protoplanetary disks, we performed near-infrared interferometric observations of the classical TTauri binary system S CrA. We present the first…
Clash of Titans: a MUSE dynamical study of the extreme cluster merger SPT-CL J0307-6225
D. Hernández-Lang, A. Zenteno, A. Diaz-Ocampo +23
We present VLT/MUSE spectroscopy, along with archival Gemini/GMOS spectroscopy, Magellan/Megacam imaging, and Chandra X-ray emission for SPT-CL J0305-6225, a z=0.58 major merging g…
Measurement of the R response function for electroproduction at = 0.070 (GeV/c) in the transition}
N. Sparveris, R. Alarcon, D. Barkhuff +44
Quadrupole amplitudes in the $γ^{*}N\toÎ$ transition are associated with the issue of nucleon deformation. A search for these small amplitudes has been the focus of a series of m…
Sensitivity of future liquid argon dark matter search experiments to core-collapse supernova neutrinos
P. Agnes, S. Albergo, I. F. M. Albuquerque +273
Future liquid-argon DarkSide-20k and ARGO detectors, designed for direct dark matter search, will be sensitive also to core-collapse supernova neutrinos, via coherent elastic neutr…
Mid-infrared interferometry with K band fringe-tracking I. The VLTI MIDI+FSU experiment
A. Müller, J. -U. Pott, A. Mérand +11
Context: A turbulent atmosphere causes atmospheric piston variations leading to rapid changes in the optical path difference of an interferometer, which causes correlated flux loss…