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Detection of the S(1) Rotational Line of H2 toward IRC+10216: A Simultaneous Measurement of the Mass-loss Rate and CO Abundance
Cernicharo, J.; Fonfría, J. P.; Richter, M. J. +2 more
We report the first detection of the S(1) pure rotational line of ortho-H2 at 17.04 µm in an asymptotic giant branch star, using observations of IRC+10216 with the Echelon-cross-echelle Spectrograph (EXES) mounted on the Stratospheric Observatory for Infrared Astronomy. This line, which was observed in a very high-sensitivity spec…
The K2 Galactic Archaeology Program: Overview, target selection, and survey properties
Bland-Hawthorn, Joss; Sharma, Sanjib; Stello, Dennis +3 more
K2 was a community-driven NASA mission where all targets were proposed through guest observer programmes. Here we provide an overview of one of the largest of these endeavours, the K2 Galactic Archaeology Programme (K2GAP), with about 25 per cent of the observed targets being allocated to this programme. K2GAP provides asteroseismic parameters for…
Spectroscopic and Imaging Observations of Spatially Extended Magnetic Reconnection in the Splitting of a Solar Filament Structure
Liu, Ying D.; Hu, Huidong; Peter, Hardi +2 more
On the Sun, Doppler shifts of bidirectional outflows from the magnetic-reconnection site have been found only in confined regions through spectroscopic observations. Without spatially resolved spectroscopic observations across an extended region, the distribution of reconnection and its outflows in the solar atmosphere cannot be made clear. Magnet…
The alignment between brightest cluster galaxies and host clusters
Yuan, Z. S.; Wen, Z. L.
The alignment between the brightest cluster galaxies (BCGs) and host clusters can reveal the mystery of the formation and evolution of galaxy clusters. We measure cluster orientations in optical based on the projected distribution of member galaxies and in X-ray by fitting the morphology of intracluster medium (ICM). Cluster orientations determine…
A holistic approach to understand helium enrichment in interplanetary coronal mass ejections: new insights
Yogesh; Chakrabarty, D.; Srivastava, N.
Despite helium abundance [AHe = (nH/nHe) × 100] being ~8 per cent at the solar photospheric/chromospheric heights, AHe can be found to exceed 8 per cent in interplanetary coronal mass ejections (ICMEs) on many occasions. Although various factors like interplanetary shocks, chromospheric evaporation, and …
Statistical study of lightning-generated whistler-mode waves observed by Venus Express
Zhang, Tielong; Russell, Christopher T.; Hart, Richard A.
From 2006 through 2014, Venus Express regularly observed lightning-generated whistler-mode waves in the ionosphere of Venus. Since the ionopause of Venus is relatively low on the dayside, we restrict our statistical results to below 400 km altitude. Although the detections were of comparable rates for solar minimum and solar maximum (5.4% and 5.0%…
Sensitivity estimation for dark matter subhalos in synthetic Gaia DR2 using deep learning
Benito, M.; Bazarov, A.; Hütsi, G. +3 more
The abundance of dark matter subhalos orbiting a host galaxy is a generic prediction of the cosmological framework, and is a promising way to constrain the nature of dark matter. In this paper, we investigate the use of machine learning-based tools to quantify the magnitude of phase-space perturbations caused by the passage of dark matter subhalos…
Modeling the Luminosity-dependent Pulse Profile and Emission Geometry of SMC X-2 during a Giant Outburst
Laycock, Silas G. T.; Vasilopoulos, Georgios; Christodoulou, Dimitris M. +3 more
One of the brightest X-ray pulsars in the Small Magellanic Cloud is SMC X-2. During its most recent major outburst in 2015, this transient pulsar displayed significant changes in both its accretion state and magnetosphere, particularly when it entered the low-luminosity regime of subcritical accretion. Polestar is a pulse-profile modeling code tha…
Short-timescale X-ray spectral variability in the Seyfert 1 galaxy NGC 3783
Kaastra, J. S.; Kriss, G. A.; Bianchi, S. +9 more
Aims: We report on the X-ray time-resolved spectral analysis of XMM-Newton observations of NGC 3783. Our main goal is to detect transient features in the Fe K line complex in order to study the dynamics of the innermost accretion flow.
Methods: We reanalyse archival observations of NGC 3783, a bright local active galactic nucleus, for wh…
Chronological and compositional mapping of the Mare Orientale basin using Chandrayaan-1 - M3 and LRO datasets
Karthi, A.; Arivazhagan, S.
The lunar multiring mare basins have different ages, compositions and are associated with the diverse unit of mare deposits, providing evidence for the origin and evolution of the lunar crust. The multiring basins offer the opportunity to assess many unknown questions that may reveal the lunar geologic standpoint. The Mare Orientale basin is one o…