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The Kinematics of the Ultra-faint Milky Way Satellites: Solving the Missing Satellite Problem
We present Keck DEIMOS spectroscopy of stars in eight of the newly discovered ultra-faint dwarf galaxies around the Milky Way. We measure the velocity dispersions of Canes Venatici I, Canes Venatici…
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Accurate masses for dispersion-supported galaxies
We derive an accurate mass estimator for dispersion-supported stellar systems and demonstrate its validity by analysing resolved line-of-sight velocity data for globular clusters, dwarf galaxies and…
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MULTI-ELEMENT ABUNDANCE MEASUREMENTS FROM MEDIUM-RESOLUTION SPECTRA. III. METALLICITY DISTRIBUTIONS OF MILKY WAY DWARF SATELLITE GALAXIES
We present metallicity distribution functions (MDFs) for the central regions of eight dwarf satellite galaxies of the Milky Way: Fornax, Leo I and II, Sculptor, Sextans, Draco, Canes Venatici I, and…
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Swope Supernova Survey 2017a (SSS17a), the optical counterpart to a gravitational wave source
TLDR
A rapid astronomical search located the optical counterpart of the neutron star merger GW170817 and shows how these observations can be explained by an explosion known as a kilonova, which produces large quantities of heavy elements in nuclear reactions.
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A common mass scale for satellite galaxies of the Milky Way
TLDR
New measurements of the velocities of the stars in these galaxies are used to show that they are consistent with them having a common mass of about 107 within their central 300 parsecs, demonstrating that the faintest of the Milky Way satellites are the most dark-matter-dominated galaxies known.
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Uncovering Extremely Metal-Poor Stars in the Milky Way’s Ultrafaint Dwarf Spheroidal Satellite Galaxies
We present new metallicity measurements for 298 individual red giant branch stars in eight of the least luminous dwarf spheroidal galaxies (dSphs) in the Milky Way (MW) system. Our technique is based…
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An extremely luminous X-ray outburst at the birth of a supernova
TLDR
This work reports the serendipitous discovery of a supernova at the time of the explosion, marked by an extremely luminous X-ray outburst, and attributes the outburst to the ‘break-out’ of the supernova shock wave from the progenitor star, and shows that the inferred rate of such events agrees with that of all core-collapse supernovae.
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The M33 Metallicity Project: Resolving the Abundance Gradient Discrepancies in M33
We present a new determination of the metallicity gradient in M33, based on Keck LRIS measurements of oxygen abundances using the temperature-sensitive emission line [O III] λ4363 in 61 H II regions.…
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The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the Extended Baryon Oscillation Spectroscopic Survey and from the Second Phase of the Apache Point…
The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since 2014 July. This paper describes the second data release from this phase, and the 14th from SDSS overall…
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LSST Science Book, Version 2.0
A survey that can cover the sky in optical bands over wide fields to faint magnitudes with a fast cadence will enable many of the exciting science opportunities of the next decade. The Large Synoptic…
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