Search Publications
Missions
Journals
Publication Years
CO Outflow Candidates toward the W3/4/5 Complex I: The Sample and Its Spatial Distribution
Xu, Ye; Yan, Qing-Zeng; Sun, Yan +3 more
Using the Purple Mountain Observatory Delingha 13.7 m telescope, we conducted a large-scale 12CO ≤ft(J=1\to 0\right) outflow survey (over ∼110 deg2) toward the W3/4/5 complex and its surroundings. In total, 459 outflow candidates were identified. Approximately 62% (284) were located in the Perseus arm, including the W3/4/5 co…
Cassini Radio Occultation Observations of Titan's Ionosphere: The Complete Set of Electron Density Profiles
Dalba, Paul A.; Withers, Paul
Titan's ionosphere is an important component of the moon's environment. Ionospheric densities above ≈900 km have been studied with in situ measurements, but few density profiles for lower altitudes has been reported. Here we report the generation of the complete set of twenty ionospheric electron density profiles from the Cassini Radio Science Sub…
The Importance of Secondary Halos for Strong Lensing in Massive Galaxy Clusters across Redshift
Florian, Michael K.; Gladders, Michael D.; Li, Nan +6 more
Cosmological cluster-scale strong gravitational lensing probes the mass distribution of the dense cores of massive dark matter halos and the structures along the line of sight from background sources to the observer. It is frequently assumed that the primary lens mass dominates the lensing, with the contribution of secondary masses along the line …
An X-ray spectroscopic search for dark matter and unidentified line signatures in the Perseus cluster with Hitomi
Fabian, Andrew C.; Maeda, Yoshitomo; Gandhi, Poshak +14 more
The reported detection of a 3.5 keV emission signal in the Perseus cluster core by Bulbul et al. (2014, ApJ, 789, 13) was ruled out at high confidence in analysis conducted by Aharonian et al. (2017, ApJ, 837, L15) of X-ray spectra at 5 eV energy resolution obtained with the Hitomi observatory Soft X-ray Spectrometer (SXS). Using the same data, we…
Volume uncertainty assessment method of asteroid models from disc-integrated visual photometry
Bartczak, P.; Dudziński, G.
The need for more accurate asteroid models is perhaps secondary to the need to measure their quality. The uncertainties of models' parameters propagate to quantities like volume or density - the most important and informative properties of asteroids - affecting conclusions about their physical nature. Our knowledge on shapes and spins of small Sol…
Ground-based observation of ZZ Ceti stars and the discovery of four new variables
Kepler, S. O.; Romero, Alejandra D.; Koester, D. +7 more
We perform ground-based photometric observations of 22 DA white dwarf stars, 10 already known ZZ Cetis and 12 candidates with atmospheric parameters inside the classical instability strip. We report on the discovery of four new variable DA white dwarf stars. Two objects are near the middle of the instability strip, SDSS J082804.63+094956.6 and SDS…
Origin of hydrogen fluoride emission in the Orion Bar. An excellent tracer for CO-dark H2 gas clouds
Shipman, R. F.; van der Tak, F. F. S.; Tielens, A. G. G. M. +1 more
Context. The hydrogen fluoride (HF) molecule is seen in absorption in the interstellar medium (ISM) along many lines of sight. Surprisingly, it is observed in emission toward the Orion Bar, which is an interface between the ionized region around the Orion Trapezium stars and the Orion molecular cloud.
Aims: We aim to understand the origin of …
Collisions of acoustic solitons and their electric fields in plasmas at critical compositions
Verheest, Frank; Hereman, Willy A.
Acoustic solitons obtained through a reductive perturbation scheme are normally governed by a Korteweg-de Vries (KdV) equation. In multispecies plasmas at critical compositions the coefficient of the quadratic nonlinearity vanishes. Extending the analytic treatment then leads to a modified KdV (mKdV) equation, which is characterized by a cubic non…
Observationally inferred dark matter phase-space distribution and direct detection experiments
Mandal, Sayan; Majumdar, Subhabrata; Rentala, Vikram +1 more
We present a detailed analysis of the effect of an observationally determined dark matter (DM) velocity distribution function (VDF) of the Milky Way (MW) on DM direct detection rates. We go beyond local kinematic tracers and use rotation curve data up to 200 kpc to construct a MW mass model and self-consistently determine the local phase-space dis…
Identification of AGN in the XMM-Newton X-ray survey of the SMC
Maitra, Chandreyee; Haberl, Frank; Cioni, Maria-Rosa L. +2 more
Context. Finding active galactic nuclei (AGN) behind the Magellanic Clouds (MCs) is difficult because of the high stellar density in these fields. Although the first AGN behind the Small Magellanic Cloud (SMC) were reported in the 1980s, it is only recently that the number of AGN known behind the SMC has increased by several orders of magnitude. <…