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Showing 2019Show all

262 papers · 1 filter

astro-ph.HE2019★ 50 cited

Probing Cosmic Ray Transport with Radio Synchrotron Harps in the Galactic Center

Timon Thomas, Christoph Pfrommer, Torsten A. Enßlin

Recent observations with the MeerKAT radio telescope reveal a unique population of faint non-thermal filaments pervading the central molecular zone (CMZ). Some of those filaments a…

astro-ph.CO2019★ 10 cited

Mitigating the impact of fiber assignment on clustering measurements from deep galaxy redshift surveys

Tomomi Sunayama, Masahiro Takada, Martin Reinecke +6

We examine the impact of fiber assignment on clustering measurements from fiber-fed spectroscopic galaxy surveys. We identify new effects which were absent in previous, relatively…

astro-ph.GA2019★ 3 cited

Ionized gas kinematics of massive elliptical galaxies in CALIFA and in cosmological zoom-in simulations

Jan Florian, Bodo Ziegler, Michaela Hirschmann +5

(Abridged) We present an investigation of kinematical imprints of AGN feedback on the Warm Ionized gas Medium (WIM) of massive early-type galaxies (ETGs). To this end, we take a tw…

astro-ph.SR2019★ 56 cited

The Aarhus Red Giants Challenge I: Stellar structures in the red giant branch phase

V. Silva Aguirre, J. Christensen-Dalsgaard, S. Cassisi +23

(Abridged). We introduce the Aarhus Red Giants Challenge, a series of detailed comparisons between widely used stellar evolution and oscillation codes aiming at establishing the mi…

astro-ph.HE2019★ 46 cited

Formation and merging of Mass Gap Black Holes in Gravitational Wave Merger Events from Wide Hierarchical Quadruple Systems

Mohammadtaher Safarzadeh, Adrian S. Hamers, Abraham Loeb +1

We investigate secular evolution in hierarchical quadruple systems as a formation channel of mass-gap black holes (with masses of about ) in systems that will even…

astro-ph.CO2019★ 231 cited

TDCOSMO. I. An exploration of systematic uncertainties in the inference of from time-delay cosmography

M. Millon, A. Galan, F. Courbin +22

Time-delay cosmography of lensed quasars has achieved 2.4% precision on the measurement of the Hubble constant, . As part of an ongoing effort to uncover and control systemati…

astro-ph.SR2019★ 54 cited

Detection and characterisation of oscillating red giants: first results from the TESS satellite

Víctor Silva Aguirre, Dennis Stello, Amalie Stokholm +78

Since the onset of the `space revolution' of high-precision high-cadence photometry, asteroseismology has been demonstrated as a powerful tool for informing Galactic archaeology in…

astro-ph.GA2019★ 34 cited

Early-type galaxy density profiles from IllustrisTNG: II. Evolutionary trend of the total density profile

Yunchong Wang, Mark Vogelsberger, Dandan Xu +8

We study the evolutionary trend of the total density profile of early-type galaxies (ETGs) in IllustrisTNG. To this end, we trace ETGs from to and measure the power-law…

astro-ph.CO2019★ 9 cited

Observing the redshifted 21 cm signal around a bright QSO at

Qing-Bo Ma, Benedetta Ciardi, Koki Kakiichi +3

We use hydrodynamics and radiative transfer simulations to study the 21~cm signal around a bright QSO at . Due to its powerful UV and X-ray radiation, the QSO quickly in…

astro-ph.SR2019★ 21 cited

First discovery of trans-iron elements in a DAO-type white dwarf (BD)

L. Löbling, M. A. Maney, T. Rauch +4

We have identified 484 lines of the trans-iron elements (TIEs) Zn, Ga, Ge, Se, Br, Kr, Sr, Zr, Mo, In, Te, I, Xe, and Ba, for the first time in the ultraviolet spectrum of a DAO-ty…

astro-ph.GA2019★ 109 cited

The REQUIEM Survey I: A Search for Extended Ly-Alpha Nebular Emission Around 31 z>5.7 Quasars

Emanuele Paolo Farina, Fabrizio Arrigoni-Battaia, Tiago Costa +19

The discovery of quasars few hundred megayears after the Big Bang represents a major challenge to our understanding of black holes and galaxy formation and evolution. Their luminos…

astro-ph.CO2019★ 68 cited

The Three Hundred Project: correcting for the hydrostatic-equilibrium mass bias in X-ray and SZ surveys

S. Ansarifard, E. Rasia, V. Biffi +8

Accurate and precise measurements of masses of galaxy clusters are key to derive robust constraints on cosmological parameters. Rising evidence from observations, however, confirms…

astro-ph.HE2019★ 39 cited

Spectral modeling of type II supernovae II. A machine learning approach to quantitative spectroscopic analysis

C. Vogl, W. E. Kerzendorf, S. A. Sim +3

There are now hundreds of publicly available supernova spectral time series. Radiative transfer modeling of this data gives insights into the physical properties of these explosion…

astro-ph.GA2019★ 46 cited

Survey of Gravitationally-lensed Objects in HSC Imaging (SuGOHI). IV. Lensed quasar search in the HSC survey

James H. H. Chan, Sherry H. Suyu, Alessandro Sonnenfeld +9

Strong gravitationally lensed quasars provide powerful means to study galaxy evolution and cosmology. We use Chitah to hunt for new lens systems in the Hyper SuprimeCam Subaru S…

astro-ph.GA2019★ 37 cited

Structural and photometric properties of barred galaxies from the Auriga cosmological simulations

Guillermo Blázquez-Calero, Estrella Florido, Isabel Pérez +6

In this work we analyse the structural and photometric properties of 21 barred simulated galaxies from the Auriga Project. These consist of Milky Way-mass magneto-hydrodynamical si…

astro-ph.HE2019★ 16 cited

iPTF14hls as a variable hyper-wind from a very massive star

Takashi J. Moriya, Paolo A. Mazzali, Elena Pian

The origin of iPTF14hls, which had Type IIP supernova-like spectra but kept bright for almost two years with little spectral evolution, is still unclear. We here propose that iPTF1…

astro-ph.GA2019★ 20 cited

Braginskii viscosity on an unstructured, moving mesh accelerated with super-time-stepping

Thomas Berlok, Ruediger Pakmor, Christoph Pfrommer

We present a method for efficiently modelling Braginskii viscosity on an unstructured, moving mesh. Braginskii viscosity, i.e., anisotropic transport of momentum with respect to th…

astro-ph.CO2019★ 6 cited

The effect of our local motion on the Sandage-Loeb test of the cosmic expansion

Takuya Inoue, Eiichiro Komatsu, Wako Aoki +3

Redshifts of an astronomical body measured at multiple epochs (e.g., separated by 10 years) are different due to the cosmic expansion. This so-called Sandage-Loeb test offers a dir…

astro-ph.HE2019★ 10 cited

First characterization of Swift J1845.7-0037 with NuSTAR

V. Doroshenko, S. Tsygankov, J. Long +5

The hard X-ray transient source Swift J1845.7-0037 was discovered in 2012 by Swift/BAT. However, at that time no dedicated observations of the source were performed. On Oct 2019 th…

astro-ph.GA2019★ 73 cited

X-ray Signatures of Black Hole Feedback: Hot Galactic Atmospheres in IllustrisTNG and X-ray Observations

Nhut Truong, Annalisa Pillepich, Norbert Werner +6

Hot gaseous atmospheres that permeate galaxies and extend far beyond their stellar distribution, where they are commonly referred to as the circumgalactic medium (CGM), imprint imp…

astro-ph.GA2019★ 79 cited

Magnetising the circumgalactic medium of disk galaxies

Ruediger Pakmor, Freeke van de Voort, Rebekka Bieri +7

The circumgalactic medium (CGM) is one of the frontiers of galaxy formation and intimately connected to the galaxy via accretion of gas on to the galaxy and gaseous outflows from t…

astro-ph.CO2019★ 260 cited

Universal structure of dark matter haloes over a mass range of 20 orders of magnitude

Jie Wang, Sownak Bose, Carlos S. Frenk +4

Cosmological models in which dark matter consists of cold elementary particles predict that the dark halo population should extend to masses many orders of magnitude below those at…

astro-ph.CO2019★ 86 cited

First Simulations of Axion Minicluster Halos

Benedikt Eggemeier, Javier Redondo, Klaus Dolag +2

We study the gravitational collapse of axion dark matter fluctuations in the post-inflationary scenario, so-called axion miniclusters, with N-body simulations. Largely confirming t…

astro-ph.SR2019★ 17 cited

The impact of progenitor asymmetries on the neutrino-driven convection in core-collapse supernovae

Rémi Kazeroni, Ernazar Abdikamalov

The explosion of massive stars in core-collapse supernovae may be aided by the convective instabilities that develop in their innermost nuclear burning shells. The resulting fluctu…