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Reconstructing the aqueous history within the southwestern Melas basin, Mars: Clues from stratigraphic and morphometric analyses of fans
Williams, Rebecca M. E.; Weitz, Catherine M.
New details of the aqueous history in the southwestern Melas Chasma elevated basin have been revealed from analysis of high-resolution image, topographic and spectral datasets. We have identified eleven fan-shaped landforms that reflect various depositional environments. A distinctive marker bed with inferred indurated aeolian bedforms is within t…
PKS 1510-089: a rare example of a flat spectrum radio quasar with a very high-energy emission
Barnacka, Anna; Moderski, Rafal; Behera, Bagmeet +2 more
Context. The blazar
The low-high-low trend of type III radio burst starting frequencies and solar flare hard X-rays
Kontar, Eduard P.; Vilmer, Nicole; Reid, Hamish A. S.
Aims: Using simultaneous X-ray and radio observations from solar flares, we investigate the link between the type III radio burst starting frequency and hard X-ray spectral index. For a proportion of events the relation derived between the starting height (frequency) of type III radio bursts and the electron beam velocity spectral index (dedu…
Orbital Monitoring of the AstraLux Large M-dwarf Multiplicity Sample
Henning, Thomas; Brandner, Wolfgang; Schlieder, Joshua +6 more
Orbital monitoring of M-type binaries is essential for constraining their fundamental properties. This is particularly useful in young systems, where the extended pre-main-sequence evolution can allow for precise isochronal dating. Here, we present the continued astrometric monitoring of the more than 200 binaries of the AstraLux Large Multiplicit…
An empirical mass-loss law for Population II giants from the Spitzer-IRAC survey of Galactic globular clusters
Dalessandro, E.; Valenti, E.; Rich, R. M. +4 more
Aims: The main aim of the present work is to derive an empirical mass-loss (ML) law for Population II stars in first and second ascent red giant branches.
Methods: We used the Spitzer InfraRed Array Camera (IRAC) photometry obtained in the 3.6-8 µm range of a carefully chosen sample of 15 Galactic globular clusters spanning the ent…
Direct Evidence of an Eruptive, Filament-hosting Magnetic Flux Rope Leading to a Fast Solar Coronal Mass Ejection
Chen, Bin; Gary, D. E.; Bastian, T. S.
Magnetic flux ropes (MFRs) are believed to be at the heart of solar coronal mass ejections (CMEs). A well-known example is the prominence cavity in the low corona that sometimes makes up a three-part white-light (WL) CME upon its eruption. Such a system, which is usually observed in quiet-Sun regions, has long been suggested to be the manifestatio…
Plasma physics of magnetic island coalescence during magnetic reconnection
Huang, Shiyong; Zhou, Meng; Deng, Xiaohua +2 more
A large-scale two-dimensional electromagnetic particle-in-cell simulation was employed to study the magnetic island coalescence/merging process during magnetic reconnection with guide field. The merged island after coalescence is characterized by strong core field and plasma density dip at the island center. We found that the core field enhancemen…
The HST view of the broad line region in low luminosity AGN
Capetti, A.; Balmaverde, B.
We analyze the properties of the broad line region (BLR) in low luminosity AGN by using HST/STIS spectra. We consider a sample of 24 nearby galaxies in which the presence of a BLR has been reported from their Palomar ground-based spectra. Following a widely used strategy, we used the [S II] doublet to subtract the contribution of the narrow emissi…
CLASH: Photometric redshifts with 16 HST bands in galaxy cluster fields
Infante, L.; Zheng, W.; Molino, A. +35 more
Context. The Cluster Lensing And Supernovae survey with Hubble (CLASH) is a Hubble Space Telescope (HST) Multi-Cycle Treasury programme thatobserves 25 massive galaxy clusters, 20 of which were X-ray-selected to preferably choose dynamically relaxed clusters, and 5 additional "high magnification" clusters, which were selected based on their optica…
Very Late Photometry of SN 2011fe
Ruiter, A. J.; Seitenzahl, I. R.; Kerzendorf, W. E. +1 more
The Type Ia supernova SN 2011fe is one of the closest supernovae of the past decades. Due to its proximity and low dust extinction, this object provides a very rare opportunity to study the extremely late time evolution (>900 days) of thermonuclear supernovae. In this Letter, we present our photometric data of SN 2011fe taken at an unprecedente…