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The HETDEX Survey: The Lyα Escape Fraction from 3D-HST Emission-Line Galaxies at z ∼ 2
Finkelstein, Steven L.; Schneider, Donald P.; Janowiecki, Steven +13 more
In this work, we measure the Lyα escape fraction of 935 [O III]-emitting galaxies between 1.9 < z < 2.35 by comparing stacked spectra from the Hubble Space Telescope/WFC3's near-IR grism to corresponding stacks from the Hobby-Eberly Telescope Dark Energy Experiment's Internal Data Release 2. By measuring the stacks' Hβ to Lyα ratios, we dete…
The complex multi-component outflow of the Seyfert galaxy NGC 7130
Knapen, J. H.; Comerón, S.; Ramos Almeida, C. +1 more
Active galactic nuclei (AGN) are a key ingredient for understanding galactic evolution, as their activity is coupled to the host galaxy properties through feedback processes. AGN-driven outflows are one of the manifestations of this feedback. The laser guide star adaptive optics mode for MUSE at the VLT now permits us to study the innermost tens o…
Multiband variability of the TeV blazar PG 1553+113 with XMM-Newton
Gupta, Alok C.; Wiita, Paul J.; Gaur, Haritma +1 more
We present variability analyses of twenty pointed XMM-Newton observations of the high energy peaked TeV blazar PG 1553+113 taken during 2010-2018. We found intraday variability in the total X-ray energy range (0.3-10 keV) in 16 out of 19 light curves or a duty cycle of ~84 per cent. A discrete correlation function analysis of the intraday light cu…
SOFIA Observations of 30 Doradus. I. Far-infrared Dust Polarization and Implications for Grain Alignment and Disruption by Radiative Torques
Lee, Min-Young; Coudé, Simon; Soam, Archana +7 more
Located in the Large Magellanic Cloud and mostly irradiated by the massive star cluster R136, 30 Doradus is an ideal target to test the leading theory of grain alignment and rotational disruption by RAdiative Torques (RATs). Here, we use publicly available polarized thermal dust emission observations of 30 Doradus at 89, 154, and 214 µm usin…
The X-ray evolution and geometry of the 2018 outburst of XTE J1810-197
Tiengo, A.; Götz, D.; Mereghetti, S. +17 more
After 15 yr, in late 2018, the magnetar XTE J1810-197 underwent a second recorded X-ray outburst event and reactivated as a radio pulsar. We initiated an X-ray monitoring campaign to follow the timing and spectral evolution of the magnetar as its flux decays using Swift, XMM-Newton, NuSTAR, and NICER observations. During the year-long campaign, th…
Aggregates of clusters in the Gaia data
Paunzen, E.; Piecka, M.
Context. The precision of the parallax measurements by Gaia is unprecedented. As of Gaia Data Release 2, the number of known nearby open clusters has increased. Some of the clusters appear to be relatively close to each other and form aggregates, which makes them interesting objects to study.
Aims: We study the aggregates of clusters which sh…
Measuring the Mass Function of Isolated Stellar Remnants with Gravitational Microlensing I. Revisiting the OGLE-III Dark Lens Candidates
Mróz, P.; Wyrzykowski, Ł.
Gravitational microlensing may detect dark stellar remnants - black holes or neutron stars - even if they are isolated. However, it is challenging to estimate masses of isolated dark stellar remnants using solely photometric data for microlensing events. A recent analysis of OGLE-III long-timescale microlensing events exhibiting the annual paralla…
Causes of Jets in the Quasi-Perpendicular Magnetosheath
Kajdič, Primož; Raptis, Savvas; Blanco-Cano, Xóchitl +1 more
Magnetosheath jets are currently an important topic in the field of magnetosheath physics. It is thought that 97% of the jets are produced by the shock rippling at quasi-parallel shocks. Recently, large statistical studies of magnetosheath jets have been performed, however, it is not clear whether rippling also produces jets found downstream of qu…
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). VIII. Modeling ram pressure stripping of diffuse gas in the Virgo cluster spiral galaxy NGC 4330
Boquien, M.; Soida, M.; Boselli, A. +7 more
NGC 4330 is one of the Virgo galaxies whose UV emission distributions show a tail structure. An associated tail structure is also observed in the HI and Hα emission distributions. Previous dynamical modeling has shown that the galaxy is approaching the cluster center and is therefore undergoing increasing ram pressure stripping. Recent stellar pop…
Detecting the Figure Rotation of Dark Matter Halos with Tidal Streams
Price-Whelan, Adrian M.; Valluri, Monica; Snyder, Sarah J.
The dark matter halos that surround Milky Way-like galaxies in cosmological simulations are, to first order, triaxial. Nearly 30 yr ago it was predicted that such triaxial dark matter halos should exhibit steady figure rotation or tumbling motions for durations of several gigayears. The angular frequency of figure rotation predicted by cosmologica…