Search Publications
The search for ultraviolet luminous objects in GALEX data
Zhao, Gang; Malkov, Oleg Yu; Karpov, Sergey V.
Selection of extreme objects in data from large-scale sky surveys is a powerful tool for the detection of new classes of astrophysical objects or rare stages of their evolution. The cross-matching of catalogues and analysis of the colour indices of their objects is the usual approach to this problem, which has already provided a lot of interesting…
Probing ultradiffuse galaxies out to the virial radius of the Coma cluster with XMM-Newton
Walker, S. A.; Mirakhor, M. S.
We probe the formation scenarios and the active galactic nucleus (AGN) occupation fraction of ultradiffuse galaxies (UDGs) in the nearby Coma cluster by utilizing XMM-Newton observations of 779 out of 854 UDG candidates identified by the Subaru survey. Their origin is probed by measuring the dark matter halo mass of the stacked sample of UDGs and …
X-ray observations of the nova shell IPHASX J210204.7+471015
Estrada-Dorado, S.; Guerrero, M. A.; Toalá, J. A. +4 more
We present the analysis of XMM-Newton European Photon Imaging Camera (EPIC) observations of the nova shell IPHASX J210204.7+471015. We detect X-ray emission from the progenitor binary star with properties that resemble those of underluminous intermediate polars such as DQ Herculis (DQ Her): an X-ray-emitting plasma with temperature of TX
Detecting and analysing geomorphological structures in images of comet 67P/Churyumov-Gerasimenko using Fourier transform
Schröter, Matthias; Boehnhardt, Hermann; Pack, Andreas +1 more
We present a method for automatized detection and analysis of quasi-periodic lineament structures from images at pixel precision. The method exploits properties of the images' frequency domain found by using the Fourier transform. We developed this method with the goal of detecting lineament structures in an image of the Hathor cliff of comet 67P/…
Erratum: UV and X-ray observations of the neutron star LMXB EXO 0748-676 in its quiescent state
Degenaar, N.; Wijnands, R.; Costantini, E. +5 more
The accretion behaviour in low-mass X-ray binaries (LMXBs) at low luminosities, especially at <E34 erg/s, is not well known. This is an important regime to study to obtain a complete understanding of the accretion process in LMXBs, and to determine if systems that host neutron stars with accretion-heated crusts can be used probe the physics of …
Construction of a far-ultraviolet all-sky map from an incomplete survey: application of a deep learning algorithm
Jo, Young-Soo; Choi, Yeon-Ju; Kim, Min-Gi +3 more
We constructed a far-ultraviolet (FUV) all-sky map based on observations from the Far Ultraviolet Imaging Spectrograph (FIMS) aboard the Korean microsatellite Science and Technology SATellite-1. For the ${\sim}20{{\ \rm per\ cent}}$ of the sky not covered by FIMS observations, predictions from a deep artificial neural network were used. Seven data…
Ionized gas kinematics of cluster AGN at z 0.8 with KMOS
Rosati, Piero; Nantais, Julie; Demarco, Ricardo +6 more
We present an integral field spectroscopy study of two active galactic nuclei (AGN) in the galaxy cluster RXJ0152-137 at z = 0.84. We have combined integrated and 3D spectra with HST images to perform a complete morpho-kinematical analysis of each galaxy. For G557, we detect narrow and broad H α and [N II] emission. The broad H α component is reds…
Jovian electrons at the Earth orbit and stationary structures in the solar wind
Kecskeméty, K.; Daibog, E. I.; Logachev, Yu I.
This work studies the influence of the structure of inner heliospheric magnetic field on the propagation of Jovian electrons from Jupiter to the Earth orbit. Beginning from 1974, 13-month variations of relativistic Jovian electron fluxes were recorded by spacecraft near the Earth. 22 synodic cycles are analysed. The best connection in each cycle w…
Discovery of galaxy clusters and a head-tail radio galaxy in the direction of globular cluster NGC 6752
Wang, Wei; Li, Zhiyuan; Cheng, Zhongqun +1 more
We report on the discovery of CXOU J191100-595621 and CXOU J191012-595619, two galaxy clusters serendipitously detected in the direction of globular cluster NGC 6752, based on archival Chandra observations with a total exposure time of ~344 ks. The deep Chandra X-ray data enabled us to measure the properties of both systems. We found a redshift of…
Analysis of modern astrometric catalogues in the Gaia era
Akhmetov, V. S.; Fedorov, P. N.; Tsvetkova, V. S. +1 more
We investigate the systems of proper motions of stars in the ground-based catalogues HSOY, UCAC5, GPS1, and PMA derived by combining with the Gaia DR1 space data. Assuming the systematic differences of stellar proper motions of two catalogues to be caused by the mutual solid-body rotation and glide of the coordinate systems produced by the data of…