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The Effect of Light Deflection by Solar System Objects on High-precision Square Kilometre Array Astrometry
Xu, Ye; Hao, Chaojie; Li, Yingjie +4 more
We have computed the deflection angles caused by 195 objects in the solar system, including 177 satellites, and eight asteroids; 21 satellites and six asteroids can bend light from distant compact extragalactic sources by more than 0.1 µas, and 14 satellites, and the asteroid Ceres can deflect light by more than 1.0 µas. We calculated …
Insight into martian crater degradation history based on crater depth and diameter statistics
Pan, Lu; Quantin-Nataf, Cathy; Mandon, Lucia +2 more
Impact craters are widely used to investigate the geologic history of planetary surfaces. Their morphology bears clues on past surface processes that affected it such as erosion, sedimentary deposit and volcanic processes and their density is widely used to date planetary surfaces.
In this study we propose to combine crater Density and morpho…Detection of a Broad 8 µm UIR Feature in the Mid-infrared Spectrum of WR 125 Observed with Subaru/COMICS
Onaka, Takashi; Sakon, Itsuki; Williams, Peredur M. +3 more
We present the detection of a broad 8 µm feature in newly formed dust around the carbon-rich Wolf-Rayet (WC) binary WR 125 from N-band low-resolution (NL; R ~ 250) spectroscopy between 7.3 and 13.6 µm and N-band (11.7 µm) and Q-band (18.8 µm) imaging with Subaru/COMICS in 2019 October. WR 125 is a colliding-wind binary (WC7…
The XXL survey. XLIX. Linking the members star formation histories to the cluster mass assembly in the z = 1.98 galaxy cluster XLSSC 122
Pierre, M.; Poggianti, B.; Carnall, A. C. +5 more
The most massive protoclusters virialize to become clusters at z ~ 2, which is also a critical epoch for the evolution of their member galaxies. XLSSC 122 is a z = 1.98 galaxy cluster with 37 spectroscopically confirmed members. We aim to characterize their star formation histories in the context of the cluster accretion history. We measure their …
Losing a minute every two years: SRG X-ray view of the rapidly accelerating X-ray pulsar SXP 1323
Tsygankov, S. S.; Lutovinov, A. A.; Mereminskiy, I. A. +4 more
The source SXP 1323 is a peculiar high-mass X-ray binary located in the Small Magellanic Cloud. It is renowned for its rapid spin-up. We investigate for the first time broadband X-ray properties of SXP 1323 as observed by the Mikhail Pavlinsky ART-XC and eROSITA telescopes on board the Spectrum-Roentgen-Gamma observatory. Using ART-XC and eROSITA …
The strange case of Na I in the atmosphere of HD 209458 b. Reconciling low- and high-resolution spectroscopic observations
Pallé, E.; Casasayas-Barris, N.; Micela, G. +3 more
Aims: We aim to investigate the origin of the discrepant results reported in the literature about the presence of Na I in the atmosphere of HD 209458 b, based on low- and high-resolution transmission spectroscopy.
Methods: We generated synthetic planetary atmosphere models and we compared them with the transmission light curves and spect…
An asymmetrical model for high-energy radiation of Cassiopeia A
Wang, Wei; Li, Zhuo; Mou, Guobin +1 more
The supernova remnant Cassiopeia A (Cas A) shows strong radiation from radio to gamma-ray bands. The mechanism of gamma-ray radiation in Cas A and its possible contribution to PeV cosmic rays are still under debate. The X-ray imaging reveals an asymmetric profile of Cas A, suggesting the existence of a jet-like structure. In this paper, we propose…
Testing Lyα Emission-line Reconstruction Routines at Multiple Velocities in One System
Redfield, Seth; Drake, Jeremy J.; France, Kevin +6 more
The 1215.67 Å H I Lyα emission line dominates the ultraviolet flux of low-mass stars, including the majority of known exoplanet hosts. Unfortunately, strong attenuation by the interstellar medium (ISM) obscures the line core in most stars, requiring the intrinsic Lyα flux to be reconstructed based on fits to the line wings. We present a test of th…
The resolved jet of 3C 273 at 150 MHz. Sub-arcsecond imaging with the LOFAR international baselines
Quinn, J.; Morabito, L. K.; Sweijen, F. +6 more
Context. Since its discovery in 1963, 3C 273 has become one of the most widely studied quasars with investigations spanning the electromagnetic spectrum. While much has therefore been discovered about this historically notable source, its low-frequency emission is far less well understood. Observations in the megahertz (MHz) regime have traditiona…
Towards a fully consistent Milky Way disk model. V. The disk model for 4-14 kpc
Just, A.; Sysoliatina, K.
Context. The semi-analytic Just-Jahreiß (JJ) model of the Galactic disk is a flexible tool for stellar population synthesis with a fine age resolution of 25 Myr. The model has recently been calibrated in the solar neighbourhood against the Gaia DR2 stars. We have identified two star-formation bursts within the last ∼4 Gyr of the local star-formati…