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Forward Modeling of Solar Coronal Magnetic Field Measurements Based on a
Magnetic-field-induced Transition in Fe X: It was recently proposed that the intensity ratios of several extreme
ultraviolet spectral lines from the Fe X ion can be used to measure the solar
coronal magnetic field based on the magnetic-field-ind... | astro-ph |
Microlensing by gas filaments: Gas in the interstellar matter is generally organized in filamentary
structures, which may be also relevant for a complementary explanation of the
dark matter in the Galactic halo. We examine the possibility that such
structures may act as gravitational microlenses on background sources. ... | astro-ph |
Shock formation around planets orbiting M-dwarf stars: Bow shocks can be formed around planets due to their interaction with the
coronal medium of the host stars. The net velocity of the particles impacting
on the planet determines the orientation of the shock. At the Earth's orbit,
the (mainly radial) solar wind is pr... | astro-ph |
Performance and energy footprint assessment of FPGAs and GPUs on HPC
systems using Astrophysics application: New challenges in Astronomy and Astrophysics (AA) are urging the need for a
large number of exceptionally computationally intensive simulations. "Exascale"
(and beyond) computational facilities are mandatory t... | astro-ph |
Investigating the damping rate of phase-mixed Alfven waves: Context: This paper investigates the effectiveness of phase mixing as a
coronal heating mechanism. A key quantity is the wave damping rate, $\gamma$,
defined as the ratio of the heating rate to the wave energy.
Aims: We investigate whether or not laminar pha... | astro-ph |
K2 Ultracool Dwarfs Survey. V. High superflare rates on rapidly rotating
late-M dwarfs: We observed strong superflares (defined as flares with energy in excess of
10^33 erg) on three late-M dwarfs: 2MASS J08315742+2042213 (hereafter
2M0831+2042; M7 V), 2MASS J08371832+2050349 (hereafter 2M0837+2050; M8 V) and
2MASS J... | astro-ph |
The Decrease of Specific Angular Momentum and the Hot Toroid Formation:
The Massive Clump G10.6-0.4: This is the first paper of our series of high resolution (1") studies of the
massive star forming region G10.6--0.4. We present the emission line
observations of the hot core type tracers (O$^{13}$CS, OCS, SO$_{2}$) w... | astro-ph |
2D and 3D Core-Collapse Supernovae Simulation Results Obtained with the
CHIMERA Code: Much progress in realistic modeling of core-collapse supernovae has occurred
recently through the availability of multi-teraflop machines and the increasing
sophistication of supernova codes. These improvements are enabling simulati... | astro-ph |
Large-Scale Structure and Future Surveys: As the 2dF Galaxy Redshift Survey and Sloan Digital Sky Survey move toward
completion, it is time to ask what the next generation of survey of large-scale
structure should be. I discuss some of the cosmological justifications for such
surveys and conclude that surveys at z=3 of... | astro-ph |
The X-ray Flux Distribution of Sagittarius A* as Seen by Chandra: We present a statistical analysis of the X-ray flux distribution of Sgr A*
from the Chandra X-ray Observatory's 3 Ms Sgr A* X-ray Visionary Project (XVP)
in 2012. Our analysis indicates that the observed X-ray flux distribution can
be decomposed into a s... | astro-ph |
Systematic bias in the estimate of cluster mass and the fluctuation
amplitude from cluster abundance statistics: We revisit the estimate of the mass fluctuation amplitude, sigma_8, from the
observational X-ray cluster abundance. In particular, we examine the effect of
the systematic difference between the cluster vir... | astro-ph |
Tracing the Physical Conditions in Active Galactic Nuclei with
Time-Dependent Chemistry: We present an extension of the code ProDiMo that allows for a modeling of
processes pertinent to active galactic nuclei and to an ambient chemistry that
is time dependent. We present a proof-of-concept and focus on a few
astrophy... | astro-ph |
Cosmological model: from initial conditions to structure formation: Observational cosmology is on the verge of new discoveries that will change
the essence of our world-view. The matter concerns origin of initial conditions
and physics of dark matter. | astro-ph |
Multiple Populations and a CH Star Found in the 300S Globular Cluster
Stellar Stream: Milky Way globular clusters (GCs) display chemical enrichment in a phenomenon
called multiple stellar populations (MSPs). While the enrichment mechanism is
not fully understood, there is a correlation between a cluster's mass and th... | astro-ph |
No self-shadowing instability in 2D radiation-hydrodynamical models of
irradiated protoplanetary disks: Theoretical models of protoplanetary disks including stellar irradiation
often show a spontaneous amplification of scale height perturbations, produced
by the enhanced absorption of starlight in enlarged regions. I... | astro-ph |
The Structure of HE 1104-1805 from Infrared to X-Ray: The gravitationally lensed quasar HE 1104-1805 has been observed at a variety
of wavelengths ranging from the mid-infrared to X-ray for nearly 20 years. We
combine flux ratios from the literature, including recent Chandra data, with
new observations from the SMARTS ... | astro-ph |
The Quark-Hadron Phase Transition, QCD Lattice Calculations and
Inhomogeneous Big-Bang Nucleosynthesis: We review recent lattice QCD results for the surface tension at the finite
temperature quark-hadron phase transition and discuss their implications on the
possible scale of inhomogeneities. In the quenched approxim... | astro-ph |
Modeling the flyby anomalies with dark matter scattering: update with
additional data and further predictions: We continue our exploration of whether the flyby anomalies can be explained
by scattering of spacecraft nucleons from dark matter gravitationally bound to
the earth, with the addition of data from five new f... | astro-ph |
Ionizing photon production of Population III stars: effects of rotation,
convection, and initial mass function: The first stars are thought to be one of the dominant sources of hydrogen
reionization in the early Universe, with their high luminosities and surface
temperatures expected to drive high ionizing photon pro... | astro-ph |
Reverberation measurement of the inner radius of the dust torus in NGC
4151 during 2008-2013: We investigate the correlation between infrared (JHKL) and optical (B) fluxes
of the variable nucleus of the Seyfert galaxy NGC 4151 using partially
published data for the last 6 years (2008-2013.). Here we are using the sam... | astro-ph |
Global 21-cm signal extraction from foreground and instrumental effects
I: Pattern recognition framework for separation using training sets: The sky-averaged (global) highly redshifted 21-cm spectrum from neutral
hydrogen is expected to appear in the VHF range of $\sim20-200$ MHz and its
spectral shape and strength a... | astro-ph |
The iron and oxygen content of LMC Classical Cepheids and its
implications for the Extragalactic Distance Scale and Hubble constant: Classical Cepheids are primary distance indicators and a crucial stepping
stone to determining the present-day Hubble constant Ho to the precision and
accuracy required to constrain app... | astro-ph |
Dwarf pulses of 10 pulsars detected by FAST: How pulsars radiate is a long-standing problem. Detailed polarization
measurements of individual pulses shed light on currently unknown emission
processes. Recently, based on supersensitive observations, dwarf pulses have
been recognized as weak narrow pulses often appearing... | astro-ph |
Sunward propagating whistler waves collocated with localized magnetic
field holes in the solar wind: Parker Solar Probe observations at 35.7 Sun
radii: Observations by the Parker Solar Probe mission of the solar wind at about
35.7 solar radii reveal the existence of whistler wave packets with frequencies
below 0.1 ... | astro-ph |
Probing the Galactic Bulge with deep Adaptive Optics imaging: the age of
NGC 6440: We present first results of a pilot project aimed at exploiting the
potentiality of ground based adaptive optics imaging in the near infrared to
determine the age of stellar clusters in the Galactic Bulge. We have used a
combination of... | astro-ph |
Dark Energy Probes in Light of the CMB: CMB observables have largely fixed the expansion history of the universe in
the deceleration regime and provided two self-calibrated absolute standards for
dark energy studies: the sound horizon at recombination as a standard ruler and
the amplitude of initial density fluctuation... | astro-ph |
X-ray and radio studies of SNR CTB 37B hosting the magnetar CXOU
J171405.7-381031: We present a Chandra and XMM-Newton study of the SNR CTB 37B, along with
archival radio observations. In radio wavelengths, CTB 37B is an incomplete
shell showing bright emission from the eastern side while the X-ray morphology
shows d... | astro-ph |
Concentration, Ellipsoidal Collapse, and the Densest Dark Matter haloes: The smallest dark matter haloes are the first objects to form in the
hierarchical structure formation of cold dark matter (CDM) cosmology and are
expected to be the densest and most fundamental building blocks of CDM
structures in our universe. Ne... | astro-ph |
Resurrecting Quartic and Quadratic inflaton potentials in two-field
inflationary model: After the release of the PLANCK data, it is evident that inflationary
paradigm has stood the test of time. Even though, it is difficult to realise
inflationary paradigm in a particle physics model as the present observations
have ... | astro-ph |
A "metric" semi-Lagrangian Vlasov-Poisson solver: We propose a new semi-Lagrangian Vlasov-Poisson solver. It employs elements
of metric to follow locally the flow and its deformation, allowing one to find
quickly and accurately the initial phase-space position $Q(P)$ of any test
particle $P$, by expanding at second ord... | astro-ph |
The sigma - L correlation in Nearby Early-Type Galaxies: Early-type galaxy velocity dispersions and luminosities are correlated. The
correlation estimated in local samples (< 100 Mpc) differs from that measured
more recently in the SDSS. This is true even when systematics in the SDSS
photometric and spectroscopic param... | astro-ph |
On the methanol masers in G9.62+0.20E and G188.95+0.89: A comparison between the observed light curves of periodic masers in
G9.62+0.20E and G188.95+0.89 and the results of a simple colliding-wind binary
model is made to establish whether the flaring and other time-dependent
behaviour of the masers in these two star fo... | astro-ph |
On the phase-space structure of the Milky Way dark-matter halo: We analyse a high resolution simulation of the formation of a cluster's
dark-matter halo in a $\Lambda$CDM cosmology (Springel et al. 2001). The
resolution achieved allows us to map the phase-space structure in detail, and
characterize its evolution and de... | astro-ph |
Viscosity driven instability in rotating relativistic stars: We investigate the viscosity driven instability in rotating relativistic
stars by means of an iterative approach. We focus on polytropic rotating
equilibrium stars and impose an m=2 perturbationin the lapse. We vary both the
stiffness of the equation of state... | astro-ph |
A Further Study of the Luminosity-Dependent Cyclotron Resonance Energies
of the Binary X-ray Pulsar 4U0115+63 with RXTE: The present paper reports on the RXTE observations of the binary X-ray pulsar
4U0115+63, covering an outburst in 1999 March-April with 44 pointings. The 3-30
keV PCA spectra and the 15-50 keV HEXTE... | astro-ph |
Astrometric asteroid masses: a simultaneous determination: Using over 89 million astrometric observations of 349,737 numbered minor
planets, an attempt was made to determine the masses of 230 of them by
simultaneously solving for corrections to all orbital elements and the masses.
For 132 minor planets an acceptable re... | astro-ph |
Evidence Against a Redshift z>6 for the Galaxy STIS 123627+621755: The identification of galaxies at extreme distances provides our most direct
information on the earliest phases of galaxy formation. The distance implied by
redshifts z > 5 makes this a challenging endeavor for even the most luminous
sources; interpreta... | astro-ph |
BeppoSAX observations of the nearby low-mass X-ray binary and fast
transient SAX J1819.3-2525: SAX J1819.3-2525 is a nearby X-ray transient which exhibited a fast and large
X-ray outburst on Sep. 15, 1999 (Smith et al. 1999). The Wide Field Cameras and
the Narrow Field Instruments (NFI) on board BeppoSAX observed SAX... | astro-ph |
Optical-to-Near-Infrared Simultaneous Observations for the Hot Uranus
GJ3470b: A Hint for Cloud-free Atmosphere: We present optical (g', R_c, and I_c) to near-infrared (J) simultaneous
photometric observations for a primary transit of GJ3470b, a Uranus-mass
transiting planet around a nearby M dwarf, by using the 50-c... | astro-ph |
Exploring the Variable Sky with LINEAR. I. Photometric Recalibration
with SDSS: We describe photometric recalibration of data obtained by the asteroid survey
LINEAR. Although LINEAR was designed for astrometric discovery of moving
objects, the dataset described here contains over 5 billion photometric
measurements fo... | astro-ph |
Quantifying Intrinsic Variability of Sagittarius A* using Closure Phase
Measurements of the Event Horizon Telescope: General relativistic magnetohydrodynamic (GRMHD) simulations of accretion
disks and jets associated with supermassive black holes show variability on a
wide range of timescales. On timescales comparabl... | astro-ph |
Characterisation of pulsed Carbon fiber illuminators for FIR instrument
calibration: We manufactured pulsed illuminators emitting in the far infrared for the
Planck-HFI bolometric instrument ground calibrations. Specific measurements
have been conducted on these light sources, based on Carbon fibers, to
understand an... | astro-ph |
Inside-out or Outside-in: The topology of reionization in the
photon-starved regime suggested by Lyman-alpha forest data: We use a set of semi-numerical simulations based on Zel'dovich approximation,
friends-of-friends algorithm and excursion set formalism to generate
reionization maps of high dynamic range with a ra... | astro-ph |
The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages
(ASHES). X: Hot Gas Reveals Deeply Embedded Star Formation: Massive infrared dark clouds (IRDCs) are considered to host the earliest
stages of high-mass star formation. In particular, 70 $\mu$m dark IRDCs are the
colder and more quiescent clouds. At a sca... | astro-ph |
X-Rays Beware: The Deepest Chandra Catalogue of Point Sources in M31: This study represents the most sensitive Chandra X-ray point source catalogue
of M31. Using 133 publicly available Chandra ACIS-I/S observations totalling ~1
Ms, we detected 795 X-ray sources in the bulge, northeast, and southwest fields
of M31, cove... | astro-ph |
Window function dependence of the novel mass function of primordial
black holes: We investigate the ambiguity of the novel mass function of primordial black
holes, which has succeeded in identifying the black hole mass in a given
configuration of fluctuations, due to the choice of window function of smoothed
density ... | astro-ph |
Toward a global model of the interactions in low-lying states of methyl
cyanide: rotational and rovibrational spectroscopy of the $v_4 = 1$ state and
tentative interstellar detection of the $v_4 = v_8 = 1$ state in Sgr B2(N): New and existing rotational spectra of methyl cyanide were analyzed to extend
the global m... | astro-ph |
Matching Radio Catalogs with Realistic Geometry: Application to SWIRE
and ATLAS: Crossmatching catalogs at different wavelengths is a difficult problem in
astronomy, especially when the objects are not point-like. At radio wavelengths
an object can have several components corresponding, for example, to a core and
lob... | astro-ph |
ALMA observations of cold molecular gas filaments trailing rising radio
bubbles in PKS0745-191: We present ALMA observations of the CO(1-0) and CO(3-2) line emission tracing
filaments of cold molecular gas in the central galaxy of the cluster
PKS0745-191. The total molecular gas mass of 4.6 +/- 0.3 x 10^9 solar masse... | astro-ph |
Statistical Analysis of Filament Features Based on the Hα Solar
Images from 1988 to 2013 by Computer Automated Detection Method: We improve our filament automated detection method which was proposed in our
previous works. It is then applied to process the full disk H$\alpha$ data
mainly obtained by Big Bear Solar Obs... | astro-ph |
New Insights: the Accretion Process and Variable Wind from TW Hya: For the first time in a classical T Tauri star, we are able to trace an
accretion event signaled by an hour-long enhancement of X-rays from the
accretion shock and revealed through substantial sequential changes in optical
emission line profiles. Downfl... | astro-ph |
Origin and Dynamical Evolution of Neptune Trojans - II: Long Term
Evolution: We present results examining the fate of the Trojan clouds produced in our
previous work. We find that the stability of Neptunian Trojans seems to be
strongly correlated to their initial post-migration orbital elements, with
those objects th... | astro-ph |
Accurate mass estimates from the proper motions of dispersion-supported
galaxies: Starting with the spherical Jeans equation, we show that there exists a
radius where the mass enclosed depends only on the projected tangential
velocity dispersion, assuming that the anisotropy profile slowly varies. This
is well-approx... | astro-ph |
Inferring the magnetic field vector in the quiet Sun. III. Disk
variation of the Stokes profiles and isotropism of the magnetic field: We have studied the angular distribution of the magnetic field vector in the
solar internetwork employing high-quality data (noise level $\sigma \approx
3\times 10^{-4}$ in units of t... | astro-ph |
On the description of the GCR intensity in the last three solar minima: We discuss the main characteristic features in the heliospheric parameters
important for the GCR intensity modulation for the last three solar minima
(1986--1987, 1996--1997 and 2008--2009). The model for the GCR intensity
modulation is considered ... | astro-ph |
The supercluster-void network V. Alternative evidence for its regularity: The distribution of Abell clusters of galaxies is analysed to study the
regularity of the supercluster-void network. A new geometric method sensitive
to the regularity of the location of clusters is applied. We find that the
supercluster-void net... | astro-ph |
Detection of heavy-metal lines in the spectrum of the circumstellar
envelope of a post-AGB star: Splitting of the strongest absorption lines with a lower-level excitation
potential $\chi<$1eV has been detected for the first time in the optical
spectra of the post-AGB star V354Lac obtained with a spectral resolution
R... | astro-ph |
Study of muons from ultra-high energy cosmic ray air showers measured
with the Telescope Array experiment: One of the uncertainties in interpretation of ultra-high energy cosmic ray
(UHECR) data comes from the hadronic interaction models used for air shower
Monte Carlo (MC) simulations. The number of muons observed a... | astro-ph |
When does an old nova become a dwarf nova? Kinematics and age of the
nova shell of the dwarf nova AT Cnc: The Z Cam-type dwarf nova AT Cnc displays a classical nova (CN) shell,
demonstrating that mass transfer in cataclysmic binaries decreases
substantially after a CN eruption. The hibernation scenario of cataclysmic... | astro-ph |
An updated catalogue of giant radio sources: We present a catalogue of 349 giant radio sources (GRSs including both
galaxies and quasars). The database contains all giants known to date from the
literature. These GRSs cover the redshift range of 0.016$<$z$<$3.22 and include
radio sources of projected linear sizes large... | astro-ph |
Features of the inflaton potential and the power spectrum of
cosmological perturbations: We discuss features of the inflaton potential that can lead to a strong
enhancement of the power spectrum of curvature perturbations. We show that a
steep decrease of the potential induces an enhancement of the spectrum by
severa... | astro-ph |
X Ray Precursors in SGRs: Precessing Gamma Jet Tails: Weak isolated X-ray precursor events before the main Gamma Ray Burst, GRB,
and also rare Soft Gamma Repeaters, SGR, events are in complete disagreement
with any Fireball, or Magnetar, one-shoot explosive scenarios. Fireball model
in last two years has been deeply mo... | astro-ph |
A Critical Look at the Mass-Metallicity-SFR Relation in the Local
Universe. I. An Improved Analysis Framework and Confounding Systematics: It has been proposed that the mass-metallicity relation of galaxies exhibits
a secondary dependence on star formation rate (SFR), and that the resulting
M-Z-SFR relation may be re... | astro-ph |
Massive Star Evolution and Nucleosynthesis -Lower End of Fe-Core
Collapse Supernova Progenitors and Remnant Neutron Star Mass Distribution-: In order to explore various aspects of stellar evolution, supernovae, gamma
ray bursts and nucleosynthesis, we have developed a new efficient stellar
evolution code. In this pap... | astro-ph |
Impact of Scale Dependent Bias and Nonlinear Structure Growth on the ISW
Effect: Angular Power Spectra: We investigate the impact of nonlinear evolution of the gravitational
potentials in the LCDM model on the Integrated Sachs-Wolfe (ISW) contribution
to the CMB temperature power spectrum, and on the cross-power spec... | astro-ph |
3D Smoothed Particle Hydrodynamics Models of Betelgeuse's Bow Shock: Betelgeuse, the bright red supergiant (RSG) in Orion, is a runaway star. Its
supersonic motion through the interstellar medium has resulted in the formation
of a bow shock, a cometary structure pointing in the direction of motion. We
present the first... | astro-ph |
Temperature-dependent oscillation modes in rotating superfluid neutron
stars: We calculate the spectrum of inertial oscillation modes in a slowly rotating
superfluid neutron star, including, for the first time, both the effects of
finite temperatures and entrainment between superfluid neutrons and protons. We
work in... | astro-ph |
Chromaticity in all-reflective telescopes for astrometry: Chromatic effects are usually associated with refractive optics, so
reflective telescopes are assumed to be free from them. We show that
all-reflective optics still bears significant levels of such perturbations,
which is especially critical to modern micro-arcs... | astro-ph |
Confirmation of double peaked Lyman-alpha emission at z=6.593:
Witnessing a galaxy directly contributing to the reionisation of the Universe: Distant luminous Lyman-alpha emitters (LAEs) are excellent targets for
spectroscopic observations of galaxies in the epoch of reionisation (EoR). We
present deep high-resolutio... | astro-ph |
Instability of a stalled accretion shock: evidence for the
advective-acoustic cycle: We analyze the linear stability of a stalled accretion shock in a perfect gas
with a parametrized cooling function L ~ rho^{beta-alpha} P^alpha. The
instability is dominated by the l=1 mode if the shock radius exceeds 2-3 times
the a... | astro-ph |
The orbital period of the recurrent X-ray transient in Terzan 6: Four or five new outbursts were detected of the bright X-ray transient GRS
1747-312 in the globular cluster Terzan 6 between 1996 and 1999, through
monitoring campaigns with the Wide Field Cameras (WFCs) on BeppoSAX and the
Proportional Counter Array (PCA... | astro-ph |
Diagnostics for specific PAHs in the far-IR: searching neutral
naphthalene and anthracene in the Red Rectangle: Context. In the framework of the interstellar polycyclic aromatic
hydrocarbons (PAHs) hypothesis, far-IR skeletal bands are expected to be a
fingerprint of single species in this class. Aims. We address the... | astro-ph |
On mass distribution of coalescing black holes: Available data on the chirp mass distribution of the coalescing black hole
binaries in O1-O3 LIGO/Virgo runs are analyzed and compared statistically with
the distribution calculated under the assumption that these black holes are
primordial with a log-normal mass spectrum... | astro-ph |
A New Numerical Method for Solving Radiation Driven Winds from Hot Stars: We present a general method for solving the non--linear differential equation
of monotonically increasing steady--state radiation driven winds. We
graphically identify all the singular points before transforming the momentum
equation to a system ... | astro-ph |
A Large Scale, Low Frequency Murchison Widefield Array Survey of
Galactic HII regions between 260< l <\340: We have compiled a catalogue of HII regions detected with the Murchison
Widefield Array (MWA) between 72 and 231MHz. The multiple frequency bands
provided by the MWA allow us identify the characteristic spectru... | astro-ph |
Mass-sheet degeneracy, power-law models and external convergence: Impact
on the determination of the Hubble constant from gravitational lensing: The light travel time differences in strong gravitational lensing systems
allows an independent determination of the Hubble constant. This method has
been successfully appli... | astro-ph |
Luminosity versus Rotation in a Supermassive Star: We determine the effect of rotation on the luminosity of supermassive stars.
We apply the Roche model to calculate analytically the emitted radiation from a
uniformly rotating, radiation-dominated supermassive configuration. We find
that the luminosity at maximum rotat... | astro-ph |
The Li dip : a probe of angular momentum transport in low mass stars: We use the measures of Li and rotational velocities in F Hyades stars to
assess the role of the wind-driven meridian circulation and of shear turbulence
in the transport of angular momentum in stars of different masses. Our models
include both elemen... | astro-ph |
Synchrotron Outbursts in Galactic and Extra-galactic Jets, Any
Difference?: We discuss differences and similarities between jets powered by super-massive
black holes in quasars and by stellar-mass black holes in microquasars. The
comparison is based on multi-wavelength radio-to-infrared observations of the
two active... | astro-ph |
Parallel Programming with MatlabMPI: MatlabMPI is a Matlab implementation of the Message Passing Interface (MPI)
standard and allows any Matlab program to exploit multiple processors.
MatlabMPI currently implements the basic six functions that are the core of the
MPI point-to-point communications standard. The key tech... | astro-ph |
Hunting for anti-solar differentially rotating stars using the Rossby
number -- An application to the Kepler field: Anti-solar differential rotation profiles have been found for decades in
numerical simulations of convective envelopes of solar-type stars. These
profiles are characterized by a slow equator and fast po... | astro-ph |
Probing the reach of the Intermediate Polar Cataclysmic Variable
Population with Swift J183920.1-045350: We report on the Swift/XRT Deep Galactic Plane Survey discovery and
multi-wavelength follow-up observations of a new intermediate polar Cataclysmic
Variable, Swift J183920.1-045350. A 449.7 s spin period is found ... | astro-ph |
The dual origin of the nitrogen deficiency in comets: selective volatile
trapping in the nebula and postaccretion radiogenic heating: We propose a scenario that explains the apparent nitrogen deficiency in
comets in a way consistent with the fact that the surfaces of Pluto and Triton
are dominated by nitrogen-rich ic... | astro-ph |
Statistics of Photospheric Supergranular Cells Observed by SDO/HMI: Aims: The statistics of the photospheric granulation pattern are investigated
using continuum images observed by Solar Dynamic Observatory (SDO)/Helioseismic
and Magnetic Imager (HMI) taken at 6713~\AA.
Methods: The supergranular boundaries can be ex... | astro-ph |
A search for technosignatures from 14 planetary systems in the Kepler
field with the Green Bank Telescope at 1.15-1.73 GHz: Analysis of Kepler mission data suggests that the Milky Way includes billions
of Earth-like planets in the habitable zone of their host star. Current
technology enables the detection of technosi... | astro-ph |
Determination of electron density and filling factor for soft X-ray
flare kernels: In a standard method of determining electron density for soft X-ray (SXR)
flare kernels it is necessary to assume what is the extension of a kernel along
the line of sight. This is a source of significant uncertainty of the obtained
de... | astro-ph |
Radio AGN in nearby dwarf galaxies: the important role of AGN in
dwarf-galaxy evolution: We combine deep optical and radio data, from the Hyper Suprime-Cam and the
Low-Frequency Array (LOFAR) respectively, to study 78 radio AGN in nearby
(z<0.5) dwarf galaxies. Comparison to a control sample, matched in stellar mass
... | astro-ph |
Statistical characterization of polychromatic absolute and differential
squared visibilities obtained from AMBER/VLTI instrument: In optical interferometry, the visibility squared modulus are generally
assumed to follow a Gaussian distribution and to be independent of each other.
A quantitative analysis of the releva... | astro-ph |
Gipsy 3D: Analysis, Visualization and Vo-Tools: The scientific goals of the AMIGA project are based on the analysis of a
significant amount of spectroscopic 3D data. In order to perform this work we
present an initiative to develop a new VO compliant package, including present
core applications and tasks offered by the... | astro-ph |
Multi-wavelength analysis of the dust emission in the Small Magellanic
Cloud: We present an analysis of dust grain emission in the diffuse interstellar
medium of the Small Magellanic Cloud (SMC). This study is motivated by the
availability of 170 microns ISOPHOT data covering a large part of the SMC, with
a resolutio... | astro-ph |
The 2-10 keV emission properties of PSR B1937+21: We present the results of a BeppoSAX observation of the fastest pulsar known:
PSR B1937+21. The ~ 200 ks observation (78.5 (34) ks MECS (LECS) exposure
times) allowed us to investigate with high statistical significance both the
spectral properties and the pulse profile... | astro-ph |
WALLABY Pilot Survey: Public release of HI kinematic models for more
than 100 galaxies from phase 1 of ASKAP pilot observations: We present the Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY)
Pilot Phase I HI kinematic models. This first data release consists of HI
observations of three fields in the dir... | astro-ph |
BLR Modeling: A New Approach: We present a new scheme for modeling the broad line region in active galactic
nuclei. It involves photoionization calculations applied to a number of
variable emission lines at {\it all times}. We demonstrate how fitting all
lines simultaneously provide strong constraints on several of the... | astro-ph |
Grantecan spectroscopic observations and confirmations of Planetary
Nebulae candidates in the Northern Galactic Plane: We present Grantecan 10 m telescope (GTC) spectroscopic confirmations of 55
faint Planetary Nebulae (PNe) candidates discovered largely in the INT
Photometric H$_\alpha$ Survey of the Northern Galact... | astro-ph |
The chemical composition of the stellar cluster Gaia1: no surprise
behind Sirius: We observed 6 He-clump stars of the intermediate-age stellar cluster Gaia1
with the MIKE/MAGELLAN spectrograph. A possible extra-galactic origin of this
cluster, recently discovered thanks to the first data release of the ESA Gaia
missi... | astro-ph |
Space density of optically-selected type 2 quasars: Type 2 quasars are luminous active galactic nuclei (AGN) whose central
regions are obscured by large amounts of gas and dust. In this paper, we
present a catalog of type 2 quasars from the Sloan Digital Sky Survey (SDSS),
selected based on their optical emission lines... | astro-ph |
An Extended FUSE Survey of Diffuse O VI Emission in the Interstellar
Medium: We present a survey of diffuse O VI emission in the interstellar medium
obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE). Spanning 5.5
years of FUSE observations, from launch through 2004 December, our data set
consists of 292... | astro-ph |
H$_2$O$_2$-induced Greenhouse Warming on Oxidized Early Mars: The existence of liquid water within an oxidized environment on early Mars
has been inferred by the Mn-rich rocks found during recent explorations on
Mars. The oxidized atmosphere implied by the Mn-rich rocks would basically be
comprised of CO$_2$ and H$_2$O... | astro-ph |
Search for dormant black holes in the OGLE data: Light curves of ellipsoidal variables collected by the Optical Gravitational
Lensing Experiment (OGLE) were analyzed, in order to search for dormant black
hole candidates. After the preselection based on the amplitude of ellipsoidal
modulation, each object was investigat... | astro-ph |
Collisional Ionization Equilibrium for Optically Thin Plasmas. I.
Updated Recombination Rate Coefficients for Bare though Sodium-like Ions: Reliably interpreting spectra from electron-ionized cosmic plasmas requires
accurate ionization balance calculations for the plasma in question. However,
much of the atomic data ... | astro-ph |
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