Search Publications
A Catalog of Candidate Double and Lensed Quasars from Gaia and WISE Data
Secrest, Nathan J.; Makarov, Valeri V.
Making use of strong correlations between closely separated multiple or double sources and photometric and astrometric metadata in Gaia Early Data Release 3 (EDR3), we generate a catalog of candidate double- and multiply imaged lensed quasars and active galactic nuclei (AGNs), comprising 3140 systems. It includes two partially overlapping parts: a…
On the Short-period Eclipsing High-mass X-Ray Binary in NGC 4214
Soria, Roberto; Swartz, Douglas A.; Lin, Zikun
We present the results of our study of the luminous (L X ≈ 1039 erg s-1) X-ray binary CXOU J121538.2+361921 in NGC 4214, the high-mass X-ray binary with the shortest known orbital period. Using Chandra data, we confirm the ≈13,000 s (3.6 hr) eclipse period, and an eclipse duration of ≈2000 s. From this, we estimate…
New Active Galactic Nuclei Detected by the ART-XC and eROSITA Telescopes during the First Five SRG All-Sky X-ray Surveys
Gilfanov, M. R.; Medvedev, P. S.; Sunyaev, R. A. +8 more
We present the results of our identification of 14 X-ray sources detected in the eastern Galactic sky ($0^{\circ}<l<180^{\circ}$) in the 4-12 keV energy band on the combined map of the first five all-sky surveys (from December 2019 to March 2022) with the Mikhail Pavlinsky ART-XC telescope onboard the SRG observatory. All 14 sources are reli…
The first gradual solar energetic particle event with an enhanced 3He abundance on Solar Orbiter
Lario, D.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +16 more
The origin of 3He abundance enhancements in gradual solar energetic particle (SEP) events remains largely unexplained. Two mechanisms have been suggested: the reacceleration of remnant flare material by coronal mass ejection (CME)-driven shocks in interplanetary space, and concomitant activity in the corona. We explore the first gradual…
Assessing slope uncertainties of martian Digital Elevation Models from numerical propagation of errors on synthetic geological surfaces
Quantin-Nataf, C.; Leyrat, C.; Millot, C. +2 more
Digital Elevation Models (DEM) are widely used in planetary sciences, including for the specific case of Mars. DEMs allow us to extract topography parameters necessary in geomorphological studies. However, DEMs are not free from vertical errors, which yields uncertainties in calculations of parameters such as local slopes. In addition, slope maps …
The ratio of horizontal to vertical displacement in solar oscillations estimated from combined SO/PHI and SDO/HMI observations
Schmidt, W.; Woch, J.; Solanki, S. K. +44 more
In order to make accurate inferences about the solar interior using helioseismology, it is essential to understand all the relevant physical effects on the observations. One effect to understand is the (complex-valued) ratio of the horizontal to vertical displacement of the p- and f-modes at the height at which they are observed. Unfortunately, it…
Correlation between the optical veiling and accretion properties. A case study of the classical T Tauri star DK Tau
Natta, A.; Ray, T.; Delvaux, C. +3 more
Context. Classical T Tauri stars (cTTs) accrete from their circumstellar disk. The material falls onto the stellar surface, producing an accretion shock, which generates veiling in a star's spectra. In addition, the shock causes a localized accretion spot at the level of the chromosphere.
Aims: Our goal is to investigate the accretion, partic…
Modeling Solar Orbiter dust detection rates in the inner heliosphere as a Poisson process
Zaslavsky, A.; Mann, I.; Kočiščák, S. +3 more
Context. Solar Orbiter provides dust detection capability in the inner heliosphere, but estimating physical properties of detected dust from the collected data is far from straightforward.
Aims: First, a physical model for dust collection considering a Poisson process is formulated. Second, it is shown that dust on hyperbolic orbits is respon…
The hyperluminous X‑ray source population
Roberts, T. P.; Walton, D. J.; MacKenzie, A. D. A.
We have recently published a catalog of 1843 candidate ultraluminous X‑ray sources (ULXs). This is the largest catalog of ULXs to date and was built by cross‑correlating recent serendipitous source catalogs from the XMM‑Newton, Swift, and Chandra observatories with a large sample of galaxies, primarily from HyperLEDA. The catalog contains 71 hyper…
The Influence of Cloud Condensation Nucleus Coagulation on the Venus Cloud Structure
Barth, Erika L.; McGouldrick, Kevin
We present the Venus version of PlanetCARMA and demonstrate the significance of coagulation properties on the structure of the Venus cloud system. The composition of the smallest mode of particles in the Venus atmosphere, which likely serve as cloud condensation nuclei (CCN), is unknown. Here we demonstrate that a change in the ability of CCN to g…