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Human Contrast Threshold and Astronomical Visibility: The standard visibility model in light pollution studies is the formula of
Hecht (1947), as used e.g. by Schaefer (1990). However it is applicable only to
point sources and is shown to be of limited accuracy. A new visibility model is
presented for uniform achromati... | astro-ph_IM |
Design and Implementation of the wvrgcal Program: This memo describes the software engineering and technical details of the
design and implementation of the wvrgcal program and associated libraries. This
program performs off-line correction of atmospheric phase fluctuations in ALMA
observations, using the 183 GHz Water... | astro-ph_IM |
Upgrade of the VERITAS Cherenkov Telescope Array: The VERITAS Cherenkov telescope array has been fully operational since Fall
2007 and has fulfilled or outperformed its design specifications. We are
preparing an upgrade program with the goal to lower the energy threshold and
improve the sensitivity of VERITAS at all ac... | astro-ph_IM |
Laboratory gas-phase infrared spectra of two astronomically relevant PAH
cations: diindenoperylene, C$_{32}$H$_{16}$$^+$ and dicoronylene,
C$_{48}$H$_{20}$$^+$: The first gas-phase infrared spectra of two isolated astronomically relevant
and large PAH cations - diindenoperylene (DIP) and dicoronylene (DC) - in the
... | astro-ph_IM |
Temperature dependence of radiation damage annealing of Silicon
Photomultipliers: The last decade has increasingly seen the use of silicon photomultipliers
(SiPMs) instead of photomultiplier tubes (PMTs). This is due to various
advantages of the former on the latter like its smaller size, lower operating
voltage, hig... | astro-ph_IM |
Stratospheric Imaging of Polar Mesospheric Clouds: A New Window on
Small-Scale Atmospheric Dynamics: Instabilities and turbulence extending to the smallest dynamical scales play
important roles in the deposition of energy and momentum by gravity waves
throughout the atmosphere. However, these dynamics and their effec... | astro-ph_IM |
Cosmological surveys with multi-object spectrographs: Multi-object spectroscopy has been a key technique contributing to the
current era of 'precision cosmology'. From the first exploratory surveys of the
large-scale structure and evolution of the universe to the current generation
of superbly detailed maps spanning a ... | astro-ph_IM |
Processing Images from Multiple IACTs in the TAIGA Experiment with
Convolutional Neural Networks: Extensive air showers created by high-energy particles interacting with the
Earth atmosphere can be detected using imaging atmospheric Cherenkov telescopes
(IACTs). The IACT images can be analyzed to distinguish between ... | astro-ph_IM |
Equalizing the Pixel Response of the Imaging Photoelectric Polarimeter
On-Board the IXPE Mission: The Gas Pixel Detector is a gas detector, sensitive to the polarization of
X-rays, currently flying on-board IXPE - the first observatory dedicated to
X-ray polarimetry. It detects X-rays and their polarization by imagin... | astro-ph_IM |
An Advanced Atmospheric Dispersion Corrector: The Magellan Visible AO
Camera: In addition to the BLINC/MIRAC IR science instruments, the Magellan adaptive
secondary AO system will have an EEV CCD47 that can be used both for visible AO
science and as a wide-field acquisition camera. The effects of atmospheric
dispersi... | astro-ph_IM |
Design and Initial Performance of the Prototype for the BEACON
Instrument for Detection of Ultrahigh Energy Particles: The Beamforming Elevated Array for COsmic Neutrinos (BEACON) is a planned
neutrino telescope designed to detect radio emission from upgoing air showers
generated by ultrahigh energy tau neutrino inte... | astro-ph_IM |
Detecting and analysing the topology of the cosmic web with spatial
clustering algorithms I: Methods: In this paper we explore the use of spatial clustering algorithms as a new
computational approach for modeling the cosmic web. We demonstrate that such
algorithms are efficient in terms of computing time needed. We e... | astro-ph_IM |
Seeing Science: The ability to represent scientific data and concepts visually is becoming
increasingly important due to the unprecedented exponential growth of
computational power during the present digital age. The data sets and
simulations scientists in all fields can now create are literally thousands of
times as l... | astro-ph_IM |
How to Scale a Code in the Human Dimension: As scientists' needs for computational techniques and tools grow, they cease
to be supportable by software developed in isolation. In many cases, these
needs are being met by communities of practice, where software is developed by
domain scientists to reach pragmatic goals an... | astro-ph_IM |
Background assessment for the TREX Dark Matter experiment: TREX-DM is conceived to look for low-mass Weakly Interacting Massive
Particles (WIMPs) using a gas Time Projection Chamber equipped with micromegas
readout planes at the Canfranc Underground Laboratory. The detector can hold in
the active volume 20 l of pressur... | astro-ph_IM |
Neutrino Astronomy - A Review of Future Experiments: Current generation neutrino telescopes cover an energy range from about 10
GeV to beyond $10^9$ GeV. IceCube sets the scale for future experiments to make
improvements. Strategies for future upgrades will be discussed in three energy
ranges. At the low-energy end, an... | astro-ph_IM |
Towards an astronomical foundation model for stars with a
Transformer-based model: Rapid strides are currently being made in the field of artificial
intelligence using Transformer-based models like Large Language Models (LLMs).
The potential of these methods for creating a single, large, versatile model in
astronomy ... | astro-ph_IM |
Modelling multimodal photometric redshift regression with noisy
observations: In this work, we are trying to extent the existing photometric redshift
regression models from modeling pure photometric data back to the spectra
themselves. To that end, we developed a PCA that is capable of describing the
input uncertaint... | astro-ph_IM |
Long-baseline horizontal radio-frequency transmission through polar ice: We report on analysis of englacial radio-frequency (RF) pulser data received
over horizontal baselines of 1--5 km, based on broadcasts from two sets of
transmitters deployed to depths of up to 1500 meters at the South Pole. First,
we analyze data ... | astro-ph_IM |
Accurate, Meshless Methods for Magneto-Hydrodynamics: Recently, we developed a pair of meshless finite-volume Lagrangian methods
for hydrodynamics: the 'meshless finite mass' (MFM) and 'meshless finite
volume' (MFV) methods. These capture advantages of both smoothed-particle
hydrodynamics (SPH) and adaptive mesh-refine... | astro-ph_IM |
Next-generation telescopes with curved focal surface for ultra-low
surface brightness surveys: In spite of major advances in both ground- and space-based instrumentation,
the ultra-low-surface brightness universe (ULSB) still remains a largely
unexplored volume in observational parameter space. ULSB observations prov... | astro-ph_IM |
Systematic biases in low frequency radio interferometric data due to
calibration: the LOFAR EoR case: The redshifted 21 cm line of neutral hydrogen is a promising probe of the
Epoch of Reionization (EoR). However, its detection requires a thorough
understanding and control of the systematic errors. We study two syste... | astro-ph_IM |
Iris: an Extensible Application for Building and Analyzing Spectral
Energy Distributions: Iris is an extensible application that provides astronomers with a
user-friendly interface capable of ingesting broad-band data from many
different sources in order to build, explore, and model spectral energy
distributions (SED... | astro-ph_IM |
A simple and efficient solver for self-gravity in the DISPATCH
astrophysical simulation framework: We describe a simple and effective algorithm for solving Poisson's equation
in the context of self-gravity within the DISPATCH astrophysical fluid
framework. The algorithm leverages the fact that DISPATCH stores multipl... | astro-ph_IM |
The conceptual design of GMagAO-X: visible wavelength high contrast
imaging with GMT: We present the conceptual design of GMagAO-X, an extreme adaptive optics
system for the 25 m Giant Magellan Telescope (GMT). We are developing GMagAO-X
to be available at or shortly after first-light of the GMT, to enable early
high... | astro-ph_IM |
REXPACO: an algorithm for high contrast reconstruction of the
circumstellar environment by angular differential imaging: Aims. The purpose of this paper is to describe a new post-processing
algorithm dedicated to the reconstruction of the spatial distribution of light
received from off-axis sources, in particular fro... | astro-ph_IM |
MegaPipe astrometry for the New Horizons spacecraft: The New Horizons spacecraft, launched by NASA in 2006, will arrive in the
Pluto-Charon system on July 14, 2015. There, it will spend a few hours imaging
Pluto and its moons. It will then have a small amount of reserve propellant
which will be used to direct the probe... | astro-ph_IM |
Machine learning techniques to distinguish near-field interference and
far-field astrophysical signals in radio telescopes: The CHIME radio telescope operates in the frequency bandwidth of 400 to 800
MHz. The CHIME/FRB collaboration has a data pipeline that analyzes the data in
real time, suppresses radio frequency i... | astro-ph_IM |
An iterative wave-front sensing algorithm for high-contrast imaging
systems: Wave-front sensing from focal plane multiple images is a promising technique
for high-contrast imaging systems. However, the wave-front error of an optics
system can be properly reconstructed only when it is very small. This paper
presents a... | astro-ph_IM |
Analysis Framework for Multi-messenger Astronomy with IceCube: Combining observational data from multiple instruments for multi-messenger
astronomy can be challenging due to the complexity of the instrument response
functions and likelihood calculation. We introduce a python-based
unbinned-likelihood analysis package c... | astro-ph_IM |
A partially dimensionally-split approach to numerical MHD: We modify an existing magnetohydrodynamics algorithm to make it more
compatible with a dimensionally-split (DS) framework. It is based on the
standard reconstruct-solve-average strategy (using a Riemann solver), and
relies on constrained transport to ensure tha... | astro-ph_IM |
Advanced Architectures for Astrophysical Supercomputing: Astronomers have come to rely on the increasing performance of computers to
reduce, analyze, simulate and visualize their data. In this environment, faster
computation can mean more science outcomes or the opening up of new parameter
spaces for investigation. If ... | astro-ph_IM |
KSIM: simulating KIDSpec, a Microwave Kinetic Inductance Detector
spectrograph for the optical/NIR: KIDSpec, the Kinetic Inductance Detector Spectrometer, is a proposed optical
to near IR Microwave Kinetic Inductance Detector (MKID) spectrograph. MKIDs are
superconducting photon counting detectors which are able to r... | astro-ph_IM |
A New Method for Band-limited Imaging with Undersampled Detectors: Since its original use on the Hubble Deep Field, "Drizzle" has become a de
facto standard for the combination of images taken by the Hubble Space Tele-
scope. However, the drizzle algorithm was developed with small, faint,
partially resolved sources in ... | astro-ph_IM |
Partially Coherent Optical Modelling of the Ultra-Low-Noise Far-Infrared
Imaging Arrays on the SPICA Mission: We have developed a range of theoretical and numerical techniques for
modeling the multi-mode, 210-34 micron, ultra-low-noise Transition Edge Sensors
that will be used on the SAFARI instrument on the ESA/JAXA... | astro-ph_IM |
Fully Automated Approaches to Analyze Large-Scale Astronomy Survey Data: Observational astronomy has changed drastically in the last decade: manually
driven target-by-target instruments have been replaced by fully automated
robotic telescopes. Data acquisition methods have advanced to the point that
terabytes of data a... | astro-ph_IM |
Automatic morphological classification of galaxy images: We describe an image analysis supervised learning algorithm that can
automatically classify galaxy images. The algorithm is first trained using a
manually classified images of elliptical, spiral, and edge-on galaxies. A large
set of image features is extracted fr... | astro-ph_IM |
Study of cosmogenic activation above ground of Ar for DarkSide-20k: The production of long-lived radioactive isotopes due to the exposure to
cosmic rays on the Earth's surface is an hazard for experiments searching for
rare events like the direct detection of galactic dark matter particles. The
use of large amounts of ... | astro-ph_IM |
The analysis of effective galaxies number count for Chinese Space
Station Optical Survey(CSS-OS) by image simulation: The Chinese Space Station Optical Survey (CSS-OS) is a mission to explore the
vast universe. This mission will equip a 2-meter space telescope to perform a
multi-band NUV-optical large area survey (ov... | astro-ph_IM |
Matched filter in the low-number count Poisson noise regime: an
efficient and effective implementation: The matched filter (MF) is widely used to detect signals hidden within the
noise. If the noise is Gaussian, its performances are well-known and
describable in an elegant analytical form. The treatment of non-Gaussi... | astro-ph_IM |
Investigating the In-Flight Performance of the UVIT Payload on ASTROSAT: We have studied the performance of the Ultraviolet Imaging Telescope payload
on AstroSat and derived a calibration of the FUV and NUV instruments on board.
We find that the sensitivity of both the FUV and NUV channels is as expected
from ground ca... | astro-ph_IM |
The Importance of Telescope Training in Data Interpretation: In this State of the Profession Consideration, we will discuss the state of
hands-on observing within the profession, including: information about
professional observing trends; student telescope training, beginning at the
undergraduate and graduate levels, a... | astro-ph_IM |
Fully-Automated Reduction of Longslit Spectroscopy with the Low
Resolution Imaging Spectrometer at Keck Observatory: I present and summarize a software package ("LPipe") for completely
automated, end-to-end reduction of both bright and faint sources with the
Low-Resolution Imaging Spectrometer (LRIS) at Keck Observat... | astro-ph_IM |
Pulsar scattering in space and time: We report on a recent global VLBI experiment in which we study the scatter
broadening of pulsars in the spatial and time domain simultaneously. Depending
on the distribution of scattering screen(s), geometry predicts that the less
spatially broadened parts of the signal arrive earli... | astro-ph_IM |
Antenna characterization for the HIRAX experiment: The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) aims to
improve constraints on the dark energy equation of state through measurements
of large-scale structure at high redshift ($0.8<z<2.5$), while serving as a
state-of-the-art fast radio burst detector... | astro-ph_IM |
Exploring the Capabilities of Gibbs Sampling in Pulsar Timing Arrays: We explore the use of Gibbs sampling in estimating the noise properties of
individual pulsars and illustrate its effectiveness using the NANOGrav 11-year
data set. We find that Gibbs sampling noise modeling (GM) is more efficient
than the current sta... | astro-ph_IM |
EMC design for the actuators of FAST reflector: The active reflector is one of the three main innovations of the
Five-hundred-meter Aperture Spherical radio Telescope (FAST). The deformation
of such a huge spherically shaped reflector into different transient parabolic
shapes is achieved by using 2225 hydraulic actuato... | astro-ph_IM |
Rethinking the modeling of the instrumental response of telescopes with
a differentiable optical model: We propose a paradigm shift in the data-driven modeling of the instrumental
response field of telescopes. By adding a differentiable optical forward model
into the modeling framework, we change the data-driven mode... | astro-ph_IM |
Radiative transfer and molecular data for astrochemistry (Review): The estimation of molecular abundances in interstellar clouds from
spectroscopic observations requires radiative transfer calculations, which
depend on basic molecular input data. This paper reviews recent developments in
the fields of molecular data an... | astro-ph_IM |
Performance results of HESP physical model: As a continuation to the published work on model based calibration technique
with HESP(Hanle Echelle Spectrograph) as a case study, in this paper we present
the performance results of the technique. We also describe how the open
parameters were chosen in the model for optimiz... | astro-ph_IM |
Estimating effective wind speed from Gemini Planet Imager's adaptive
optics data using covariance maps: The Earth's turbulent atmosphere results in speckled and blurred images of
astronomical objects when observed by ground based visible and near-infrared
telescopes. Adaptive optics (AO) systems are employed to reduc... | astro-ph_IM |
The Scaling of the RMS with Dwell Time in NANOGrav Pulsars: Pulsar Timing Arrays (PTAs) are collections of well-timed millisecond pulsars
that are being used as detectors of gravitational waves (GWs). Given current
sensitivity, projected improvements in PTAs and the predicted strength of the
GW signals, the detection o... | astro-ph_IM |
Citizen Science Astronomy with a Network of Small Telescope: The Launch
and Deployment of JWST: We present a coordinated campaign of observations to monitor the brightness
of the James Webb Space Telescope (JWST) as it travels toward the second
Earth-Sun Lagrange point and unfolds using the network ofUnistellar digit... | astro-ph_IM |
A convergent blind deconvolution method for post-adaptive-optics
astronomical imaging: In this paper we propose a blind deconvolution method which applies to data
perturbed by Poisson noise. The objective function is a generalized
Kullback-Leibler divergence, depending on both the unknown object and unknown
point spr... | astro-ph_IM |
The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space
Telescope IV. Capabilities and predicted performance for exoplanet
characterization: The Near-Inrared Spectrograph (NIRSpec) on the James Webb Space Telescope
(JWST) is a very versatile instrument, offering multiobject and integral field
spectroscopy ... | astro-ph_IM |
DQSEGDB: A time-interval database for storing gravitational wave
observatory metadata: The Data Quality Segment Database (DQSEGDB) software is a database service,
backend API, frontend graphical web interface, and client package used by the
Laser Interferometer Gravitational-Wave Observatory (LIGO), Virgo, GEO600 and... | astro-ph_IM |
A Case Study in Astronomical 3-D Printing: The Mysterious Eta Carinae: 3-D printing moves beyond interactive 3-D graphics and provides an excellent
tool for both visual and tactile learners, since 3-D printing can now easily
communicate complex geometries and full color information. Some limitations of
interactive 3-D ... | astro-ph_IM |
A Fourier optics approach to evaluate the astrometric performance of
MICADO: We present our investigation into the impact of wavefront errors on high
accuracy astrometry using Fourier Optics. MICADO, the upcoming near-IR imaging
instrument for the Extremely Large Telescope, will offer capabilities for
relative astrom... | astro-ph_IM |
Status of the Medium-Sized Telescope for the Cherenkov Telescope Array: The Cherenkov Telescope Array (CTA), is an international project for the next
generation ground- based observatory for gamma-ray astronomy in the energy
range from 20 GeV to 300 TeV. The sensitivity in the core energy range will be
dominated by up ... | astro-ph_IM |
The antinucleus annihilation reconstruction algorithm of the GAPS
experiment: The General AntiParticle Spectrometer (GAPS) is an Antarctic balloon-borne
detector designed to measure low-energy cosmic antinuclei (< 0.25 GeV/n), with
a specific focus on antideuterons, as a distinctive signal from dark matter
annihilati... | astro-ph_IM |
Adaptive Kernel Density Estimation proposal in gravitational wave data
analysis: Markov Chain Monte Carlo approach is frequently used within Bayesian
framework to sample the target posterior distribution. Its efficiency strongly
depends on the proposal used to build the chain. The best jump proposal is the
one that c... | astro-ph_IM |
The LAUE project for broadband gamma-ray focusing lenses: We present the LAUE project devoted to develop an advanced technology for
building a high focal length Laue lens for soft gamma--ray astronomy (80-600
keV). The final goal is to develop a focusing optics that can improve the
current sensitivity in the above ener... | astro-ph_IM |
All-sky Radio SETI: Over the last decade, Aperture Arrays (AA) have successfully replaced
parabolic dishes as the technology of choice at low radio frequencies - good
examples are the MWA, LWA and LOFAR. Aperture Array based telescopes present
several advantages, including sensitivity to the sky over a very wide
field-... | astro-ph_IM |
Scattering efficiencies measurements of soft protons at grazing
incidence from an Athena Silicon Pore Optics sample: Soft protons are a potential threat for X-ray missions using grazing
incidence optics, as once focused onto the detectors they can contribute to
increase the background and possibly induce radiation da... | astro-ph_IM |
Mining for Strong Gravitational Lenses with Self-supervised Learning: We employ self-supervised representation learning to distill information from
76 million galaxy images from the Dark Energy Spectroscopic Instrument Legacy
Imaging Surveys' Data Release 9. Targeting the identification of new strong
gravitational lens... | astro-ph_IM |
The Radar Echo Telescope for Cosmic Rays: Pathfinder Experiment for a
Next-Generation Neutrino Observatory: The Radar Echo Telescope for Cosmic Rays (RET-CR) is a recently initiated
experiment designed to detect the englacial cascade of a cosmic-ray initiated
air shower via in-ice radar, toward the goal of a full-sca... | astro-ph_IM |
AstroCloud: A Distributed Cloud Computing and Application Platform for
Astronomy: Virtual Observatory (VO) is a data-intensively online astronomical research
and education environment, which takes advantages of advanced information
technologies to achieve seamless and global access to astronomical information.
AstroC... | astro-ph_IM |
Portable Adaptive Optics for Exoplanet Imaging: The Portable Adaptive Optics (PAO) is a low-cost and compact system, designed
for 4-meter class telescopes that have no Adaptive Optics (AO), because of the
physical space limitation at the Nasmyth or Cassegrain focus and the
historically high cost of the conventional AO.... | astro-ph_IM |
Finding the UV-Visible Path Forward: Proceedings of the Community
Workshop to Plan the Future of UV/Visible Space Astrophysics: We present the science cases and technological discussions that came from the
workshop entitled "Finding the UV-Visible Path Forward" held at NASA GSFC June
25-26, 2015. The material present... | astro-ph_IM |
The possibility of determining open-cluster parameters from BVRI
photometry: In the last decades we witnessed an increase in studies of open clusters of
the Galaxy, especially because of the good determination for a wide range of
values of parameters such as age, distance, reddening, and proper motion. The
reliable d... | astro-ph_IM |
A Simple Proposal for Radial 3D Needlets: We present here a simple construction of a wavelet system for the
three-dimensional ball, which we label \emph{Radial 3D Needlets}. The
construction envisages a data collection environment where an observer located
at the centre of the ball is surrounded by concentric spheres w... | astro-ph_IM |
The upcoming spectroscopic powerhouses at the Isaac Newton Group of
Telescopes: The Isaac Newton Group of Telescopes is completing a strategic change for the
scientific use of its two telescopes, the 4.2-m William Herschel Telescope
(WHT) and the 2.5-m Isaac Newton Telescope (INT). After more than 30 years
operating ... | astro-ph_IM |
Audible universe: A multi-disciplinary team recently came together online to discuss the
application of sonification in astronomy, focussing on the effective use of
sound for scientific discovery and for improving accessibility to astronomy
research and education. Here we provide a meeting report. | astro-ph_IM |
Hierarchical approach to matched filtering using a reduced basis: Searching for gravitational waves from compact binary coalescence (CBC) is
performed by matched filtering the observed strain data from gravitational-wave
observatories against a discrete set of waveform templates designed to
accurately approximate the e... | astro-ph_IM |
The Influence of Satellite Trails on H.E.S.S. Gamma-Ray Astronomical
Observations: The number of satellites launched into low earth orbit has almost tripled (to
over 4000) in the last three years due to the increasing commercialisation of
space. Satellite constellations with a total of over 400,000 satellites are
pro... | astro-ph_IM |
A new photopolymer based VPHG for astronomy: The case of SN 2013fj: The spectroscopic studies of near infrared emission arising from supernovae
allow to derive crucial quantities that could better characterise physical
conditions of the expanding gas, such as the CaII IR HVF spectral feature. For
this reason is mandato... | astro-ph_IM |
The fiber-fed preslit of GIANO at T.N.G: Giano is a Cryogenic Spectrograph located in T.N.G. (Spain) and commisioned
in 2013. It works in the range 950-2500 nm with a resolving power of 50000.
This instrument was designed and built for direct feeding from the telescope
[2]. However, due to constraints imposed on the te... | astro-ph_IM |
Standard FITS template for simulated astrophysical scenes with the
WFIRST coronagraph: The science investigation teams (SITs) for the WFIRST coronagraphic
instrument have begun studying the capabilities of the instrument to directly
image reflected light off from exoplanets at contrasts down to contrasts of
~10^-9 wi... | astro-ph_IM |
The performance of the MAGIC telescopes using deep convolutional neural
networks with CTLearn: The Major Atmospheric Gamma Imaging Cherenkov (MAGIC) telescope system is
located on the Canary Island of La Palma and inspects the very high-energy
(VHE, few tens of GeV and above) gamma-ray sky. MAGIC consists of two imag... | astro-ph_IM |
Polarization loss in reflecting coating: In laser gravitational waves detectors optical loss restricts sensitivity. We
discuss polarization scattering as one more possible mechanism of optical
losses. Circulated inside interferometer light is polarized and after
reflection its plane of polarization can turn a little du... | astro-ph_IM |
LSST Target of Opportunity proposal for locating a core collapse
supernova in our galaxy triggered by a neutrino supernova alert: A few times a century, a core collapse supernova (CCSN) occurs in our galaxy.
When such galactic CCSNe happen, over 99\% of its gravitational binding energy
is released in the form of neut... | astro-ph_IM |
Measuring the Evolution of the NuSTAR Detector Gains: The memo describes the methods used to track the long-term gain variations in
the NuSTAR detectors. It builds on the analysis presented in Madsen et al.
(2015) using the deployable calibration source to measure the gain drift in the
NuSTAR CdZnTe detectors. This is ... | astro-ph_IM |
Versatile Directional Searches for Gravitational Waves with Pulsar
Timing Arrays: By regularly monitoring the most stable millisecond pulsars over many years,
pulsar timing arrays (PTAs) are positioned to detect and study correlations in
the timing behaviour of those pulsars. Gravitational waves (GWs) from
supermassi... | astro-ph_IM |
The ATLAS All-Sky Stellar Reference Catalog: The Asteroid Terrestrial-impact Last Alert System (ATLAS) observes most of
the sky every night in search of dangerous asteroids. Its data are also used to
search for photometric variability, where sensitivity to variability is limited
by photometric accuracy. Since each expo... | astro-ph_IM |
Data Multiplexing in Radio Interferometric Calibration: New and upcoming radio interferometers will produce unprecedented amounts of
data that demand extremely powerful computers for processing. This is a
limiting factor due to the large computational power and energy costs involved.
Such limitations restrict several k... | astro-ph_IM |
A distributed data warehouse system for astroparticle physics: A distributed data warehouse system is one of the actual issues in the field
of astroparticle physics. Famous experiments, such as TAIGA, KASCADE-Grande,
produce tens of terabytes of data measured by their instruments. It is critical
to have a smart data wa... | astro-ph_IM |
Swift publication statistics: a comparison with other major
observatories: Swift is a satellite equipped with gamma-ray, X-ray, and optical-UV
instruments aimed at discovering, localizing and collecting data from gamma-ray
bursts (GRBs). Launched at the end of 2004, this small-size mission finds about
a hundred GRBs ... | astro-ph_IM |
Status of predictive wavefront control on Keck II adaptive optics bench:
on-sky coronagraphic results: The behavior of an adaptive optics (AO) system for ground-based high contrast
imaging (HCI) dictates the achievable contrast of the instrument. In conditions
where the coherence time of the atmosphere is short compa... | astro-ph_IM |
hammurabi X: Simulating Galactic Synchrotron Emission with Random
Magnetic Fields: We present version X of the hammurabi package, the HEALPix-based numeric
simulator for Galactic polarized emission. Improving on its earlier design, we
have fully renewed the framework with modern C++ standards and features.
Multi-thre... | astro-ph_IM |
Modelling astronomical adaptive optics performance with
temporally-filtered Wiener reconstruction of slope data: We build on a long-standing tradition in astronomical adaptive optics (AO) of
specifying performance metrics and error budgets using linear systems modeling
in the spatial-frequency domain. Our goal is to ... | astro-ph_IM |
A Bayesian approach to high fidelity interferometric calibration II:
demonstration with simulated data: In a companion paper, we presented BayesCal, a mathematical formalism for
mitigating sky-model incompleteness in interferometric calibration. In this
paper, we demonstrate the use of BayesCal to calibrate the degen... | astro-ph_IM |
Point Source Detection and Flux Determination with PGWave: One of the largest uncertainties in the Point Source (PS) studies, at
Fermi-LAT energies, is the uncertainty in the diffuse background. In general
there are two approaches for PS analysis: background-dependent methods, that
include modeling of the diffuse backg... | astro-ph_IM |
Is HDF5 a good format to replace UVFITS?: The FITS (Flexible Image Transport System) data format was developed in the
late 1970s for storage and exchange of astronomy-related image data. Since
then, it has become a standard file format not only for images, but also for
radio interferometer data (e.g. UVFITS, FITS-IDI).... | astro-ph_IM |
2HOT: An Improved Parallel Hashed Oct-Tree N-Body Algorithm for
Cosmological Simulation: We report on improvements made over the past two decades to our adaptive
treecode N-body method (HOT). A mathematical and computational approach to the
cosmological N-body problem is described, with performance and scalability
me... | astro-ph_IM |
Apertif, Phased Array Feeds for the Westerbork Synthesis Radio Telescope: We describe the APERture Tile In Focus (Apertif) system, a phased array feed
(PAF) upgrade of the Westerbork Synthesis Radio Telescope which has transformed
this telescope into a high-sensitivity, wide field-of-view L-band imaging and
transient s... | astro-ph_IM |
On Point Spread Function modelling: towards optimal interpolation: Point Spread Function (PSF) modeling is a central part of any astronomy data
analysis relying on measuring the shapes of objects. It is especially crucial
for weak gravitational lensing, in order to beat down systematics and allow one
to reach the full ... | astro-ph_IM |
Two modified ILC methods to detect point sources in Cosmic Microwave
Background maps: We propose two detection techniques that take advantage of a small sky area
approximation and are based on modifications of the "internal linear
combination" (ILC) method, an approach widely used in Cosmology for the
separation of t... | astro-ph_IM |
Three recipes for improving the image quality with optical long-baseline
interferometers: BFMC, LFF, \& DPSC: We present here three recipes for getting better images with optical
interferometers. Two of them, Low- Frequencies Filling and Brute-Force Monte
Carlo were used in our participation to the Interferometry Bea... | astro-ph_IM |
NEBULAR: A simple synthesis code for the hydrogen and helium nebular
spectrum: NEBULAR is a lightweight code to synthesize the spectrum of an ideal, mixed
hydrogen and helium gas in ionization equilibrium, over a useful range of
densities, temperatures and wavelengths. Free-free, free-bound and two-photon
continua ar... | astro-ph_IM |
Prospects for a radio air-shower detector at South Pole: IceCube is currently not only the largest neutrino telescope but also one of
the world's most competitive instruments for studying cosmic rays in the PeV to
EeV regime where the transition from galactic to extra-galactic sources should
occur. Further augmenting t... | astro-ph_IM |
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