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Power of halometry
Van Tilburg, Ken; Weiner, Neal; Mishra-Sharma, Siddharth
Astrometric weak gravitational lensing is a powerful probe of the distribution of matter on sub-Galactic scales, which harbor important information about the fundamental nature of dark matter. We propose a novel method that utilizes angular power spectra to search for the correlated pattern of apparent motions of celestial objects induced from tim…
Searching for molecular gas inflows and outflows in the nuclear regions of five Seyfert galaxies
Rigopoulou, D.; Domínguez-Fernández, A. J.; García-Burillo, S. +8 more
Active galactic nucleus (AGN) driven outflows are believed to play an important role in regulating the growth of galaxies, mostly via negative feedback. However, their effects on their hosts are far from clear, especially for low- and moderate-luminosity Seyferts. To investigate this issue, we obtained cold molecular gas observations, traced by th…
Lens modelling of the strongly lensed Type Ia supernova iPTF16geu
Goldstein, D. A.; Amanullah, R.; Goobar, A. +3 more
In 2016, the first strongly lensed Type Ia supernova (SN Ia), iPTF16geu, at redshift z = 0.409 with four resolved images arranged symmetrically around the lens galaxy at z = 0.2163, was discovered. Here, refined observations of iPTF16geu, including the time delay between images, are used to decrease uncertainties in the lens model, including the t…
Evidence for a Coronal Shock Wave Origin for Relativistic Protons Producing Solar Gamma-Rays and Observed by Neutron Monitors at Earth
Kouloumvakos, Athanasios; Rouillard, Alexis P.; Papaioannou, Athanasios +4 more
We study the solar eruptive event on 2017 September 10 that produced long-lasting >100 MeV γ-ray emission and a ground level enhancement (GLE72). The origin of the high-energy ions producing late-phase gamma-ray emission (LPGRE) is still an open question, but a possible explanation is proton acceleration at coronal shocks produced by coronal ma…
Progenitor, precursor, and evolution of the dusty remnant of the stellar merger M31-LRN-2015
Kozłowski, S.; Kochanek, C. S.; Johansson, J. +12 more
M31-LRN-2015 is a likely stellar merger discovered in the Andromeda Galaxy in 2015. We present new optical to mid-infrared photometry and optical spectroscopy for this event. Archival data show that the source started to brighten ~2 yr before the nova event. During this precursor phase, the source brightened by ~3 mag. The light curve at 6 and 1.5…
The Magnetic Field of the Active Planet-hosting M Dwarf AU Mic
Kochukhov, Oleg; Reiners, Ansgar
AU Mic is a young, very active M dwarf star with a debris disk and at least one transiting Neptune-size planet. Here we present a detailed analysis of the magnetic field of AU Mic based on previously unpublished high-resolution optical and near-infrared spectropolarimetric observations. We report a systematic detection of circular and linear polar…
Rotation periods for cool stars in the open cluster Ruprecht 147 (NGC 6774). Implications for gyrochronology
Gruner, D.; Barnes, S. A.
Context. Gyrochronology allows the derivation of ages for cool main sequence stars based on their observed rotation periods and masses, or a suitable proxy thereof. It is increasingly well-explored for FGK stars, but requires further measurements for older ages and K - M-type stars.
Aims: We study the 2.7 Gyr-old open cluster Ruprecht 147 to …
Ionospheric Multi-Spacecraft Analysis Tools
Lühr, Hermann; Dunlop, Malcolm Wray
Magnesium abundances in cool metal-polluted white dwarfs
Blouin, Simon
The accretion of rocky material is responsible for the presence of heavy elements in the atmospheres of a large fraction of white dwarf stars. Those objects represent a unique opportunity to infer the bulk composition of exoplanetesimals. This chemical characterization requires the use of detailed atmosphere models to determine the elemental abund…
J-PLUS: Unveiling the brightest end of the Lyα luminosity function at 2.0 < z < 3.3 over 1000 deg2
Hernández-Monteagudo, C.; Hernán-Caballero, A.; Varela, J. +22 more
We present the photometric determination of the bright end of the Lyα luminosity function (LF; at LLyα ≳ 1043.3 erg s-1) within four redshift windows (Δ z < 0.16) in the interval 2.2 ≲ z ≲ 3.3. Our work is based on the Javalambre Photometric Local Universe Survey (J-PLUS) first data release, which provides m…