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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…
Targeting and image acquisition of Martian surface features with TGO/CaSSIS
Cremonese, G.; Thomas, N.; Pommerol, A. +12 more
CaSSIS is a high-resolution visual telescope onboard the ExoMars Trace Gas Orbiter. The mission started the primary science phase in April 2018. The relatively small single image footprint (typically 40 km × 9.5 km) when compared to the total surface area of Mars demands that images should be targeted and target selection is key for the science re…
The kinematics of the magnetized protostellar core IRAS15398-3359
Caselli, Paola; Redaelli, Elena; Tabatabaei, Farideh S. +1 more
Context. Observations of protostellar envelopes are essential in order to understand better the process of gravitational collapse toward star and planet formation. From a theoretical perspective, magnetic fields are considered an important factor during the early stages of star formation, especially during the main accretion phase.
Aims: Our …
Red Giants Search Method Based on Convolutional Neural Networks
Wu, Tianmin; Yi, Zhenping; Kong, Xiaoming +5 more
Red giants play a crucial role in astronomical exploration. However, the current search for these stars heavily relies on spectrum analysis, making it a cumbersome process. In this paper, we propose a novel red giant search approach called CBAMResNets. CBAMResNets enhances feature extraction from images by incorporating the Convolutional Block Att…