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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 …
Machine learning for automatic identification of new minor species
Erwin, Justin; Daerden, Frank; Ristic, Bojan +9 more
One of the main difficulties to analyze modern spectroscopic datasets is due to the large amount of data. For example, in atmospheric transmittance spectroscopy, the solar occultation channel (SO) of the NOMAD instrument onboard the ESA ExoMars2016 satellite called Trace Gas Orbiter (TGO) had produced ~ 10 millions of spectra in ~ 20000 acquisitio…
XMM-Newton spectrum of the radio-loud quasar 3C 215: Slim accretion disk or SMBH binary
Tombesi, F.; Mei, A.
Context. Radio-loud active galactic nuclei (RL AGN) exhibit very powerful jet emission in the radio band, while the radio-quiet (RQ) AGN do not. This RL-RQ dichotomy would imply a sharp difference existing among these two classes, however, modern theoretical models and observations suggest a common nuclear environment that is possibly characterize…
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…
Open clusters identifying by multi-scale density feature learning
Wang, Min; Shao, Zhengyi; Xiang, Yaobing +2 more
Open clusters (OCs) are important objects in exploring the structure and history of the Milky Way. Large amount of sky survey data can be used to detect OCs. However, analyzing these data manually has become a bottleneck of OC identification. This study proposes a multi-scale density feature learning (MSDFL), which includes the open cluster kernel…
Analysis of the Open Cluster NGC 2281
Terrell, Dirk; Gross, John; Cooney, Walter R., Jr.
B V observations of an approximately 68 ' × 48 ' field centered on the open cluster NGC 2281 and covering more than 400 nights from 2013 to 2018 are presented. The photometric observations were transformed to the standard system using standards from the American Association of Variable Star Observers Photometric All-sky Survey (APASS) DR10 and ana…
Spectroscopic Variability of the Compact Planetary Nebula Hb 12
Arkhipova, V. P.; Esipov, V. F.; Ikonnikova, N. P. +5 more
We present the results of our new low-resolution spectroscopic observations of the young compact planetary nebula Hb 12 performed in 2011-2020 with SAI MSU telescopes. We have measured the intensities of more than 50 nebular emission lines in the spectral range $λ$3687-9532, detected interstellar absorption features, and conducted a search for abs…
Multiwavelength search for and studies of active galaxies
Mickaelian, A. M.; Abrahamyan, H. V.; Paronyan, G. M. +4 more
We present surveys and related studies of active galaxies carried out at the NAS RA V.Ambartsumian Byurakan Astrophysical Observatory (BAO). This has been one of the main research subjects at BAO for many years since the mid-1950s, when Viktor Ambartsumian suggested the hypothesis of the activity of the galactic nuclei. A number of surveys of and …
Solar Wind Interaction with Earths Bow Shock
Lin, Naiguo; Lee, Ensang; Liu, Ying +3 more
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…