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The nature of the solar wind electron temperature and electron heat flux. II. Case of a spiral interplanetary magnetic field
Salem, Chadi S.; Pulupa, Marc; Hubert, Daniel
Aims: We aim to analyze the solutions of the solar wind electron energy equation in a spherical expansion with a spiral interplanetary magnetic field (IMF), a radial power law of the electron heat flux with a constant index α, and a constant or a smooth increase of the solar wind speed.
Methods: Generic analytical electron temperature pr…
TÜBİTAK TUG T60 ve İstanbul Üniversitesi İST60'ın GAIA Gözlemlerindeki Bazı Kataklismik Değişen Adaylarının Işık Eğrileri
Esenoğlu, Hasan H.; Hamed, Gamal; Dağ, Meryem Kübra
Gaia uyarıları içerisinde 5 adet kataklismik değişen (CV) adayı (Gaia16ahl, 16bnz, 14adn, 16awq ve 21bpe) küçük açıklıklı robotik teleskoplarla (büyük olanlarla da koordineli şekilde) B, V, R süzgeçlerinde ve filtresiz olarak gözlenmiştir. Adayların tanımlamaları şöyledir: 16ahl-CV, 16bnz-bilinmeyen, 14adn-bilinmeyen, 16awq-bilinmeyen ve 21bpe-nov…
SITCoM: SiRGraF Integrated Tool for Coronal dynaMics
Patel, Ritesh; Udhwani, Purvi; Shrivastav, Arpit Kumar
SiRGraF Integrated Tool for Coronal dynaMics (SITCoM) is based on the Simple Radial Gradient Filter used to filter the radial gradient in the white-light coronagraph images and bring out dynamic structures. SITCoM has been developed in Python and integrated with SunPy and can be installed by users with the command pip install sitcom. This enables …
ORIGO: A mission concept to challenge planetesimal formation theories
Mottola, Stefano; Vincent, Jean-Baptiste; Thomas, Nicolas +12 more
Comets are generally considered among the most pristine objects in our Solar System. There have thus been significant efforts to understand these bodies. During the past decades, we have seen significant progress in our theoretical understanding of planetesimal/cometesimals (the precursors of comets) formation. Recent space missions—such as ESA's …
Noise effect of test mass surface roughness in spaceborne gravitational wave detectors
Wang, Shun; Yan, Hao; Miao, Haixing +2 more
The spaceborne gravitational wave detection mission has a demanding requirement for the precision of displacement sensing, which is conducted by the interaction between the laser field and test mass. However, due to the roughness of the reflecting surface of the test mass, the displacement measurement along the sensitive axis suffers a coupling er…
ASASSN-18aan revisited
Nelson, R.; Vagnozzi, A.; Valentini, S.
The light curve of the cataclismic variable ASASSN-18aan is studied using recent observations of the MC589 Observatory, giving an orbital Period and Epoch fully consistent with the data obtained after the discovery are in 2018. Archival data from ASASSN, ZTF and Gaia were used to check if its ares have a quasi-periodic behaviour. A recurrence time…
T Tauri stars in the SuperWASP and NSVS surveys II. Spectral modelling
Munari, U.; Smalley, B.; Kundra, E. +9 more
We present results from long-term spectroscopic monitoring of 21 T-Tauri stars located in the Taurus-Auriga star-forming region (SFR). We combine medium and high-dispersion Echelle spectroscopy obtained at the Stará Lesná, Skalnaté Pleso (both in Slovakia), and Tautenburg (Germany) observatories with low-resolution flux-calibrated spectra from Asi…
Selection of Compton-thick AGN from a hard photometric sample using XMM-Newton observations
Guainazzi, Matteo; Mostafa, Reham; Ibrahim, Alaa
We present a selection technique to detect Compton-thick (CT) active galactic nuclei (AGNs) in the 3XMM/SDSS-DR7 cross-correlation. A subsample of 3481 X-ray sources that are detected in the hard band (2-8 keV) and have photometric redshifts constitute our parent sample. We first applied an automated spectral-fitting procedure to select highly abs…
Study of the X-ray properties of radio sources, based on NVSS catalogue
Mickaelian, A. M.; Abrahamyan, H. V.; Paronyan, G. M. +4 more
An identification of radio sources from the NVSS list with ROSAT X-ray sources was made as well as also with optical objects from SDSS DR 16. We have tried to find the connection between the fluxes of different wave ranges, for different types of objects. We also have tried to find the relationship between the sizes and polarization angles of sour…
HST proper motions on the far side of the Galactic bar-data
Clarkson, William I.; Rich, R. Michael; Kunder, Andrea +10 more
This is the third paper in a series that attempts to observe a clear signature of the Galactic bar/bulge using kinematic observations of the bulge stellar populations in low foreground extinction windows. We report on the detection of ~100 000 new proper motions in four fields covering the far side of the Galactic bar/bulge, at negative longitudes…