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Spectroscopic Redshift Determination for a Sample of Distant Quasars Detected by the SRG Observatory Based on RTT-150 Observations. II
Irtuganov, E. N.; Bikmaev, I. F.; Gilfanov, M. R. +16 more
Results of the spectroscopic observations at the 1.5-m Russian-Turkish telescope for another group of 12 X-ray sources discovered by the eROSITA telescope onboard the SRG space observatory and identified by the SRGz machine learning system as candidates for distant X-ray quasars are presented. Ten objects have been confirmed as quasars at redshift…
Signature and escape of highly fractionated plasma in an active region
Brooks, David H.; Yardley, Stephanie L.
Accurate forecasting of space weather requires knowledge of the source regions where solar energetic particles (SEP) and eruptive events originate. Recent work has linked several major SEP events in 2014, January, to specific features in the host active region (AR 11944). In particular, plasma composition measurements in and around the footpoints …
A Comprehensive Astrometric Calibration of HST's WFPC2. I. Distortion Mapping
Anderson, Jay; Horch, Elliott P.; Kozhurina-Platais, Vera +3 more
Wide field planetary camera 2 (WFPC2) exposures are already some 20 years older than Gaia epoch observations, or future James Webb Space Telescope observations. As such, they offer an unprecedented time baseline for high-precision proper-motion studies, provided the full astrometric potential of these exposures is reached. We have started such a p…
Tracking Advanced Planetary Systems (TAPAS) with HARPS-N. VII. Elder suns with low-mass companions
Adamów, M.; Maciejewski, G.; Villaver, E. +3 more
Context. We present the current status of and new results from our search for exoplanets in a sample of solar-mass evolved stars observed with the HARPS-N and the 3.6 m Telescopio Nazionale Galileo (TNG), and the High-Resolution Spectrograph (HRS) and the 9.2 m Hobby-Eberly Telescope (HET).
Aims: The aim of this project is to detect and chara…
Milky Way-like Gas Excitation in an Ultrabright Submillimeter Galaxy at z = 1.6
Rebolo, R.; Dannerbauer, H.; Ziegler, B. +3 more
Based on observations with the IRAM 30 m and Yebes 40 m telescopes, we report evidence of the detection of Milky Way-like, low-excitation molecular gas, up to the transition CO(J = 5-4), in a distant, dusty star-forming galaxy at z CO = 1.60454. WISE J122651.0+214958.8 (alias SDSS J1226, the Cosmic Seahorse), is strongly lensed by a for…
Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach
Alho, Markku; Johlander, Andreas; Pfau-Kempf, Yann +8 more
Modern investigations of dynamical space plasma systems such as magnetically complicated topologies within the Earth's magnetosphere make great use of supercomputer models as well as spacecraft observations. Space plasma simulations can be used to investigate energy transfer, acceleration, and plasma flows on both global and local scales. Simulati…
Orbital Solutions of the New Low-mass Eclipsing Binary TIC 157376469 with Spotted Activities
Zhang, Xiaobin; Zong, Weikai; Fu, Jian-Ning +4 more
We carried out a photometric and spectroscopic analysis for the eclipsing binary TIC 157376469 using the TESS and LAMOST data. A new linear ephemeris is given. By fitting the light curves and radial velocity curves with the Wilson-Devinney code, it apperas that the binary is composed of two K-type main-sequence stars. The orbit of the binary is sl…
Particle-in-cell simulations of the Cassini spacecraft's interaction with Saturn's ionosphere during the Grand Finale
Shebanits, Oleg; Zhang, Zeqi; Desai, Ravindra T. +2 more
A surprising and unexpected phenomenon observed during Cassini's Grand Finale was the spacecraft charging to positive potentials in Saturn's ionosphere. Here, the ionospheric plasma was depleted of free electrons with negatively charged ions and dust accumulating up to over 95 per cent of the negative charge density. To further understand the spac…
Automatic identification of outliers in Hubble Space Telescope galaxy images
Shamir, Lior
Rare extragalactic objects can carry substantial information about the past, present, and future universe. Given the size of astronomical data bases in the information era, it can be assumed that very many outlier galaxies are included in existing and future astronomical data bases. However, manual search for these objects is impractical due to th…
Variable stars in the 50BiN open cluster survey. II. NGC 869
Li, Cheng-Yuan; Deng, Li-Cai; Wang, Kun +5 more
This work presents a time-series photometric variability survey of the young open cluster NGC 869. More than 13 000 CCD frames in the BV filters were collected on 19 nights between 2014 November 6 and 2014 December 24. In a 20' × 20' field centered on the cluster, we detected a total of 28 stars showing photometric variability, 12 of which are new…