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The RGB tip of galactic globular clusters and the revision of the axion-electron coupling bound
Dalessandro, E.; Ferraro, F. R.; Pallanca, C. +5 more
Context. The production of neutrinos by plasma oscillations is the most important energy sink process operating in the degenerate core of low-mass red giant stars. This process counterbalances the release of energy induced by nuclear reactions and gravitational contraction, and determines the luminosity attained by a star at the moment of the He i…
The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: The Nature of the Faintest Dusty Star-forming Galaxies
Inami, Hanae; Smail, Ian; Bouwens, Rychard J. +20 more
We present a characterization of the physical properties of a sample of 35 securely detected, dusty galaxies in the deep ALMA 1.2 mm image obtained as part of the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) Large Program. This sample is complemented by 26 additional sources identified via an optical/infrared source positional…
Stellar population models based on the SDSS-IV MaStar library of stellar spectra - I. Intermediate-age/old models
Stassun, K.; Bizyaev, D.; Chen, Y. +14 more
We use the first release of the SDSS/MaStar stellar library comprising ∼9000, high S/N spectra, to calculate integrated spectra of stellar population models. The models extend over the wavelength range 0.36-1.03 µm and share the same spectral resolution ( $R\sim 1800$ ) and flux calibration as the SDSS-IV/MaNGA galaxy data. The parameter space cov…
Efficient solution of the anisotropic spherically aligned axisymmetric Jeans equations of stellar hydrodynamics for galactic dynamics
Cappellari, Michele
I present a flexible solution for the axisymmetric Jeans equations of stellar hydrodynamics under the assumption of an anisotropic (three-integral) velocity ellipsoid aligned with the spherical polar coordinate system. I describe and test a robust and efficient algorithm for its numerical computation. I outline the evaluation of the intrinsic velo…
High-mass X-ray binaries in nearby metal-poor galaxies: on the contribution to nebular He II emission
Charlot, Stéphane; Stark, Daniel P.; Mulchaey, John S. +4 more
Despite significant progress both observationally and theoretically, the origin of high-ionization nebular He II emission in galaxies dominated by stellar photoionization remains unclear. Accretion-powered radiation from high-mass X-ray binaries (HMXBs) is still one of the leading proposed explanations for the missing He+-ionizing photo…
The Sloan Digital Sky Survey Reverberation Mapping Project: The Hβ Radius-Luminosity Relation
Trump, Jonathan R.; Brandt, W. N.; Shen, Yue +8 more
Results from a few decades of reverberation mapping (RM) studies have revealed a correlation between the radius of the broad-line emitting region (BLR) and the continuum luminosity of active galactic nuclei. This "radius-luminosity" relation enables survey-scale black hole mass estimates across cosmic time, using relatively inexpensive single-epoc…
Continuum-fitting the X-Ray Spectra of Tidal Disruption Events
Wen, Sixiang; Jonker, Peter G.; Stone, Nicholas C. +2 more
We develop a new model for X-ray emission from tidal disruption events (TDEs), applying stationary general relativistic "slim disk" accretion solutions to supermassive black holes (SMBHs) and then ray-tracing the photon trajectories from the image plane to the disk surface, including gravitational redshift, Doppler, and lensing effects self-consis…
Galactic halo size in the light of recent AMS-02 data
Maurin, D.; Salati, P.; Génolini, Y. +6 more
Context. The vertical diffusive halo size of the Galaxy, L, is a key parameter for dark matter indirect searches. It can be better determined thanks to recent AMS-02 data.
Aims: We set constraints on L from Be/B and 10Be/Be data, and we performed a consistency check with positron data. We detail the dependence of Be/B and 10
Age dating of an early Milky Way merger via asteroseismology of the naked-eye star ν Indi
Smalley, Barry; Chaplin, William J.; Davies, Guy R. +82 more
Over the course of its history, the Milky Way has ingested multiple smaller satellite galaxies1. Although these accreted stellar populations can be forensically identified as kinematically distinct structures within the Galaxy, it is difficult in general to date precisely the age at which any one merger occurred. Recent results have rev…
Long Baseline Observations of the HD 100546 Protoplanetary Disk with ALMA
Dong, Ruobing; Pérez, Sebastián; Casassus, Simon +9 more
Using the Atacama Large Millimeter/submillimeter Array, we observed the young Herbig star HD 100546, host to a prominent disk with a deep, wide gap in the dust. The high-resolution 1.3 mm continuum observation reveals fine radial and azimuthal substructures in the form of a complex maze of ridges and trenches sculpting a dust ring. The 12