Search Publications
A correlation between accreted stellar kinematics and dark-matter halo spin in the ARTEMIS simulations
Belokurov, Vasily; Evans, N. Wyn; Dillamore, Adam M. +1 more
We report a correlation between the presence of a Gaia-Sausage-Enceladus (GSE) analogue and dark-matter (DM) halo spin in the ARTEMIS simulations of Milky Way-like galaxies. The haloes which contain a large population of accreted stars on highly radial orbits (like the GSE) have lower spin on average than their counterparts with more isotropic ste…
A High-Resolution Digital Terrain Model Mosaic of the Mars 2020 Perseverance Rover Landing Site at Jezero Crater
Tao, Yu; Muller, Jan-Peter; Xiong, Siting +2 more
We demonstrate the capabilities of a published MADNet monocular height estimation network in producing a refined digital terrain model (DTM) mosaic at 50 cm/pixel resolution for the Mars 2020 Perseverance rover landing site in Jezero crater on Mars. Our approach utilizes the publicly available Mars 2020 Terrain Relative Navigation (TRN) High-Resol…
Variable Star Detection in the Field of Open Cluster NGC 188
Zhang, Yu; Esamdin, Ali; Song, Fang-Fang +2 more
This work presents the charge-coupled device (CCD) photometric survey of the old open cluster NGC 188. Time-series V-band photometric observations were conducted for ten nights in 2017 January using the Nanshan One-meter Wide-field Telescope to search for variable stars in the field of the cluster. A total of 25 variable stars, including one new v…
A multifrequency characterization of the extragalactic hard X-ray sky. Presenting the second release of the Turin-SyCAT
Masetti, N.; Chavushyan, V.; Bottacini, E. +5 more
Context. Nowadays, we know that the origin of the cosmic X-ray background (CXB) is mainly due to the integrated emission of active galactic nuclei. Therefore, in order to obtain a precise estimate of the contribution of different source classes to the CXB, it is crucial to achieve full characterization of the hard-X ray sky.
Aims: We present …
Analysis of minimum ionising particles and soft protons using XMM-Newton EPIC pn-CCD as a particle detector
Freyberg, M. J.; Kirsch, M. G. F.; Bender, V. +1 more
Context. Spacecrafts with imaging telescopes often carry a charge-coupled device (CCD) in their focal plane to detect electromagnetic radiation. Charged particles such as electrons, protons, and heavy ions can reach the CCD and deposit their energy in the detector material. To counteract this undesirable effect, algorithms are usually implemented …
Observation of Helium in Mercury's Exosphere by PHEBUS on Bepi-Colombo
Korablev, Oleg; Belyaev, Denis; Chaufray, Jean-Yves +12 more
On 1 October 2021, Bepi-Colombo performed its first flyby of Mercury. During the maneuver, the short wavelength channel (55-155 nm) of "Probing the Hermean Exosphere by UV Spectroscopy" (PHEBUS) was activated for a total duration of 1 hr. The helium resonance line at 58.4 nm was clearly observed during the whole sequence. At large distance from th…
Solar Filament Eruptions in H α Doppler Velocity
Pevtsov, A. A.; Tlatov, A. G.; Berezin, I. A.
We use observations taken with a novel solar telescope spectroheliograph to investigate the association between the early filament rise and coronal mass ejections (CMEs). The instrument allows the H α full line profile to be registered in each pixel of the solar disk with a time cadence of about 1 minute. We analyze observations of thr…
Cometary science with CUBES
Cremonese, Gabriele; Cambianica, Pamela; Lazzarin, Monica +6 more
The proposed CUBES spectrograph for ESO's Very Large Telescope will be an exceptionally powerful instrument for the study of comets. The gas coma of a comet contains a large number of emission features in the near-UV range covered by CUBES (305-400 nm), which are diagnostic of the composition of the ices in its nucleus and the chemistry in the com…
Bubble in the Whale: Identifying the Optical Counterparts and Extended Nebula for the Ultraluminous X-Ray Sources in NGC 4631
Feng, Hua; Liu, Jifeng; Cai, Zheng +9 more
We present a deep optical imaging campaign on the starburst galaxy NGC 4631 with CFHT/MegaCam. By supplementing the HST/ACS and Chandra/ACIS archival data, we search for the optical counterpart candidates of the five brightest X-ray sources in this galaxy, four of which are identified as ultraluminous X-ray sources (ULXs). The stellar environments…
The period bouncer system SDSS J105754.25+275947.5: first radial velocity study
Zharikov, S.; Echevarría, J.; Mora Zamora, I.
We report the first radial velocity spectroscopic study of the eclipsing period bouncer SDSS J105754.25+275947.5. Together with eclipse light-curve modelling, we re-determined the system parameters and studied the accretion disc structure. We confirm that the system contains a white dwarf with MWD = 0.83(3) M⊙ and an effectiv…