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Structure of the accretion flow of IX Velorum as revealed by high-resolution spectroscopy
Pala, A. F.; Schmidtobreick, L.; Kára, J. +1 more
Context. Several high mass-transfer cataclysmic variables show evidence of outflow from the system, which could play an important role in their evolution. We investigate the system IX Vel, which was proposed to show similar characteristics.
Aims: We study the structure of the IX Vel system, particularly the structure of its accretion flow and…
Understanding technological spillovers: The case of main astrophysics European missions
Petroni, Giorgio; Venturini, Karen
Due to the complexity and relevance of the scientific problems they address, astrophysical exploration missions can be a fertile ground for technological spillover.
In the past, various space technologies, particularly in telecommunications, transportation, health care, and even military defense, spilled over or have been transferred from Spa…Dashing through the cluster: An X-ray to radio view of UGC 10420 undergoing ram-pressure stripping
Raychaudhury, Somak; Singh, Kulinder Pal; Tiwari, Juhi +1 more
We present multi-wavelength data and analysis, including new FUV AstroSat/UVIT observations of the spiral galaxy UGC 10420 ( z=0.032 ), a member of the cluster Abell 2199. UGC 10420 is present on the edge of the X-ray emitting region of the cluster at a distance of ∼ 680 kpc from the centre. The far-ultraviolet (FUV) data obtained by the AstroSat …
The Bar-Bulge Relation in Non-dwarf SB0 Galaxies in the Central Region of Coma Cluster
Hasan, S. N.; Poloji, Nagamani; Hasan, Priya
In this paper we explore the formation of bars and present the bulge and bar properties and their correlations for a sample of lenticular barred (SB0) and lenticular unbarred (S0) galaxies in the central region of the Coma Cluster using HST/ACS data. In our sample, we identified bar features using the luminosity profile decomposition software GALF…
The inferred abundance of interstellar objects of technological origin
Loeb, Abraham; Ezell, Carson
Interstellar objects discovered crossing through the solar system can either be natural objects or technological artifacts from extraterrestrial civilizations. Evidence from our own civilization suggests that early-stage technological civilizations are already able to launch artificial objects beyond their star system, and early-state to late-stag…
A Comparison of Presolar Isotopic Signatures in Laboratory-Studied Primitive Solar System Materials and Comet 67P/Churyumov-Gerasimenko: New Insights from Light Elements, Halogens, and Noble Gases
Hoppe, Peter; Altwegg, Kathrin; Rubin, Martin
Comets are considered the most primitive planetary bodies in our Solar System. ESA's Rosetta mission to Jupiter family comet 67P/Churyumov-Gerasimenko (67P/CG) has provided a wealth of isotope data which expanded the existing data sets on isotopic compositions of comets considerably. In a previous paper (Hoppe et al. in Space Sci. Rev. 214:106, 20…
Recovering Thermodynamics from Spectral Profiles Observed by IRIS. (II). Improved Calculation of the Uncertainties Based on Monte Carlo Experiments
De Pontieu, Bart; Sainz Dalda, Alberto
Observations by the Interface Region Imaging Spectrograph (IRIS) of the Mg II h & k spectral lines have provided a new diagnostic window toward knowledge of the complex physical conditions in the solar chromosphere. Theoretical efforts focused on understanding the behavior of these lines have allowed us to obtain a better and more accurate vis…
Extreme Rarefaction of Solar Wind: A Study on Origin and Characteristics Using Ulysses Observations
Hajra, Rajkumar; Tsurutani, Bruce T.; Lu, Quanming +5 more
From the Ulysses observation of the solar wind between the heliocentric distance r h of ~1.0 and ~5.4 au during 1990-2009, we identified 53 intervals when the solar wind exhibited extreme rarefaction, ~2 orders of magnitude decreases in the solar wind proton density N p from their ambient values. These extremely low-densi…
X-ray from outflow-cloud interaction and its application in tidal disruption events
Wang, Wei; Chen, Jiashi
Tidal disruption events (TDEs) may occur in supermassive black holes (SMBHs) surrounded by clouds. TDEs can generate ultrafast and large opening-angle outflow with a velocity of ~0.01-0.2 c, which will collide with clouds with time lags depending on outflow velocity and cloud distances. Since the fraction of the outflow energy transferred into clo…
On Current Sheets and Associated Density Spikes in Titan's Ionosphere as Seen From Cassini
Edberg, Niklas J. T.; Vigren, Erik; Bertucci, Cesar +3 more
The Cassini spacecraft made in-situ measurements of Titan's plasma environment during 126 close encounters between 2004 and 2017. Here we report on observations from the Radio and Plasma Waves System/Langmuir probe instrument (RPWS/LP) from which we have observed, primarily on the outbound leg, a localized increase of the electron density by up to…