Search Publications
A Lyα nebula at z ∼ 3.3
Thomas, R.; Hibon, P.; Tang, F.
Context. Searching for high-redshift galaxies is a field of intense activity in modern observational cosmology that will continue to grow with future ground-based and sky observatories. Over the last few years, a lot has been learned about the high-z Universe.
Aims: Despite extensive Lyα blobs (LAB) surveys from low to high redshifts, giant L…
The Complex Rotational Light Curve of (385446) Manwë-Thorondor, a Multicomponent Eclipsing System in the Kuiper Belt
Verbiscer, Anne J.; Grundy, William M.; Thirouin, Audrey +2 more
Kuiper Belt Object (385446) Manwë-Thorondor is a multiobject system with mutual events predicted to occur from 2014 to 2019. To detect the events, we observed the system at 4 epochs (UT 2016 August 25 and 26, 2017 July 22 and 25, 2017 November 9, and 2018 October 6) in g, r, and VR bands using the 4 m SOAR and the 8.1 m Gemini South telescopes at …
The Zelima asteroid family: Resonant configuration and rotational fission clusters
Carruba, V.; Ribeiro, J. V.
Asteroid families are groups of asteroids that are identifiable in domains of proper elements. They may be the outcome of a collision, or the product of rotational fission. Among collisional families, young asteroid families are of interest because they preserve information on the original ejection velocity field with which the asteroid fragments …
Solar modulation of the GCR flux and dose rate, observed in space between 1991 and 2019
Dachev, Tsvetan P.; Tomov, Borislav T.; Matviichuk, Yuri N. +7 more
The paper presents the solar modulation of the long-term galactic cosmic rays (GCR) flux and dose rates variations, observed during 14 space experiments by 10 Bulgarian build Liulin-type spectrometers (LTS) (Dachev et al., 2015a). They worked in near Earth space and in the interplanetary radiation environment between January 1991 and January 2019.…
Dust and gas absorption in the high mass X-ray binary IGR J16318-4848
Fürst, Felix; Grinberg, Victoria; Kretschmar, Peter +11 more
Context. With an absorption column density on the order of 1024 cm-2, IGR J16318-4848 is one of the most extreme cases of a highly obscured high mass X-ray binary. In addition to the overall continuum absorption, the source spectrum exhibits a strong iron and nickel fluorescence line complex at 6.4 keV. Previous empirical mod…
Discovery of extended structures around two evolved planetary nebulae M2-55 and Abell 2
Zhang, Yong; Hsia, Chih-Hao; Zhang, Xi-Liang +1 more
We report a multi-wavelength study of two evolved planetary nebulae (PNs)M2-55 and Abell 2. Deep optical narrow-band images ([O III], Hα, and [N II]) of M2-55 reveal two pairs of bipolar lobes and a new faint arc-like structure. This arc-shaped filament around M2-55 appears as a well-defined boundary from southwest to southeast, strongly suggestin…
The correlation length of ULF waves around Venus: VEX observations
Fränz, M.; Zhang, T. L.; Bolzan, M. J. A. +2 more
A study of the correlation length of ultra-low frequency (ULF) waves around Venus was developed using electron density and magnetic field data obtained from the Analyzer of Space Plasmas and Energetic Atoms (ASPERA-4) and magnetometer (MAG), respectively, on board of the mission Venus Express (VEX). The analysis was conducted using the whole inter…
Geozesy and geophysics of Mercury: Prospects in view of the BepiColombo mission
Hussmann, Hauke; Stark, Alexander
The BepiColombo mission, which is a joint mission of the European Space Agency (ESA) and the Japan Aerospace Exploration Agency (JAXA), was launched successfully on October 20, 2018 from Kourou, French Guyana. The spacecraft is currently on its 7 yr cruise to Mercury. The main science campaign at Mercury will begin, however, no earlier than spring…
Localized Amplification of Magnetic Field in the Solar Photosphere Associated with a Rapid Moving Pore
Yang, Bo; Yang, Jiayan; Bi, Yi +4 more
In the Sun, the flows of hot plasma drive a dynamo that generates a global magnetic field as well as smaller-scale local fields. The existence of a magnetic field in turn affects the motion of plasma so that complex dynamic characteristics can be observed. In this Letter, we give an analysis on the localized amplification of magnetic fields in fro…
Validating post-AGB candidates in the LMC and SMC using SALT spectra
Szczerba, R.; Gezer, I.; Hrivnak, B. J. +8 more
We selected a sample of post-AGB candidates in the Magellanic Clouds on the basis of their near- and mid-infrared colour characteristics. Fifteen of the most optically bright post-AGB candidates were observed with the South African Large Telescope in order to determine their stellar parameters and thus to validate or discriminate their nature as p…