Search Publications
Energy Spectral Properties of Hydrogen Energetic Neutral Atoms Emitted From the Dayside Atmosphere of Mars
Barabash, S.; Futaana, Y.; Wurz, P. +3 more
The energy spectrum of hydrogen energetic neutral atoms (HENAs) emitted from the dayside atmosphere of Mars reveals the physical processes of their origin and provides means for remote sensing on the Mars plasma environment. We first compile all available energy spectra of sunward flowing HENA using high-energy resolution data from the neutral par…
New Gamma-Ray Bursts Found in the Archival Data from the IBIS/ISGRI Telescope of the INTEGRAL Observatory
Minaev, P. Yu.; Pozanenko, A. S.; Grebenev, S. A. +1 more
A systematic search for cosmic gamma-ray bursts (GRBs) and other short hard X-ray events in the archival data from the IBIS/ISGRI telescope of the INTEGRAL observatory over 2003-2018 has been carried out. Seven previously unknown GRBs have been recorded in the telescope field of view; all of them have been localized with an accuracy ≤2 arcmin. The…
The ssos pipeline: Identification of Solar System objects in astronomical images
Bertin, E.; Bouy, H.; Carry, B. +3 more
Observatories and satellites around the globe produce tremendous amounts of imaging data to study many different astrophysical phenomena. The serendipitous observations of Solar System objects are a fortunate by-product which have often been neglected due to the lack of a simple yet efficient identification algorithm. Meanwhile, the determination …
Signatures of Magnetic Separatrices at the Borders of a Crater Flux Transfer Event Connected to an Active X-Line
Eastwood, J. P.; Lavraud, B.; Dunlop, M. W. +7 more
In this paper, we present Magnetospheric Multiscale (MMS) observations of a flux transfer event (FTE) characterized by a clear signature in the magnetic field magnitude, which shows maximum at the center flanked by two depressions, detected during a period of stable southward interplanetary magnetic field. This class of FTEs are called "crater-FTE…
A morphological study of galaxies in ZwCl0024+1652, a galaxy cluster at redshift z ∼ 0.4
Sánchez-Portal, Miguel; Pintos-Castro, Irene; Bongiovanni, Ángel +9 more
The well-known cluster of galaxies ZwCl0024+1652 at z ∼ 0.4 lacks an in-depth morphological classification of its central region. While previous studies provide a visual classification of a patched area, we used the public code called galaxy Support Vector Machine (GALSVM) and HST/ACS data as well as the WFP2 master catalogue to automatically clas…
Comparison of the PPMXL and UCAC5 Catalogs with the Gaia DR2
Liu, N.; Zhu, Z.; Liu, J. -C. +3 more
Astrometric ground-based catalogs usually suffer from varied systematic errors. These systematic errors were hard to detect because there was no independent reference catalog complete to very faint limiting magnitudes (∼20 mag). This situation has changed since the second data release of the Gaia mission (Gaia DR2). We aim to investigate positions…
Measuring relative abundances in the solar corona with optimised linear combinations of spectral lines
Buchlin, Éric; Zambrana Prado, Natalia
Context. Elemental abundances in some coronal structures differ significantly from photospheric abundances, with a dependence on the first ionization potential (FIP) of the element. Measuring these FIP-dependent abundance biases is important for coronal and heliospheric physics.
Aims: We aim to build a method for optimal determination of FIP …
Knickpoints in Martian channels indicate past ocean levels
Duran, Sergio; Coulthard, Tom J.; Baynes, Edwin R. C.
On Mars, the presence of extensive networks of sinuous valleys and large channels provides evidence for a wetter and warmer environment where liquid water was more abundant than it is at present. We undertook an analysis of all major channel systems on Mars and detected sharp changes in elevation along the river long profiles associated with steep…
Properties of jet and surrounding material of GW/GRB 170817A
Ziaeepour, Houri
We use published data in radio, optical, and X-ray bands to analyse and model afterglows of GW/GRB 170817A. Our analysis is based on a phenomenological gamma-ray burst generator model, which we previously used to study the prompt gamma-ray emission of this important transient. We find a multicomponent model and a few of its variants that are consi…
CCD U B V ( R I ) KC
Oralhan, İnci Akkaya; Michel, Raúl; Karataş, Yüksel +3 more
The open clusters NGC 2323 and NGC 2539 have been analysed using CCD