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Astrometric Search Method for Individually Resolvable Gravitational Wave Sources with Gaia
Gilmore, Gerard; Mihaylov, Deyan P.; Moore, Christopher J. +1 more
Gravitational waves (GWs) cause the apparent position of distant stars to oscillate with a characteristic pattern on the sky. Astrometric measurements (e.g., those made by Gaia) provide a new way to search for GWs. The main difficulty facing such a search is the large size of the data set; Gaia observes more than one billion stars. In this Letter …
Remote detection of widespread indigenous water in lunar pyroclastic deposits
Milliken, Ralph E.; Li, Shuai
Laboratory analyses of lunar samples provide a direct means to identify indigenous volatiles and have been used to argue for the presence of Earth-like water content in the lunar interior. Some volatile elements, however, have been interpreted as evidence for a bulk lunar mantle that is dry. Here we demonstrate that, for a number of lunar pyroclas…
The search for multiple populations in Magellanic Cloud clusters - II. The detection of multiple populations in three intermediate-age SMC clusters
Dalessandro, E.; Salaris, M.; Larsen, S. +14 more
This is the second paper in our series about the search for multiple populations in Magellanic Cloud star clusters using the Hubble Space Telescope. Here we report the detection of multiple stellar populations in the colour-magnitude diagrams of the intermediate-age clusters Lindsay 1, NGC 416 and NGC 339. With ages between 6.0 and 7.5 Gyr, these …
Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-line Spectroscopy. II. Methods and Models
Savage, Blair D.; Shull, J. Michael; Danforth, Charles W. +6 more
We present basic data and modeling for a survey of the cool, photoionized circumgalactic medium (CGM) of low-redshift galaxies using far-UV QSO absorption-line probes. This survey consists of “targeted” and “serendipitous” CGM subsamples, originally described in Stocke et al. (Paper I). The targeted subsample probes low-luminosity, late-type galax…
Effective Radii of Young, Massive Star Clusters in Two LEGUS Galaxies
Cignoni, M.; Gallagher, J. S.; Dale, D. A. +15 more
We present a study of the effective (half-light) radii and other structural properties of a systematically selected sample of young, massive star clusters (≥5 × 103 {M}⊙ and ≤200 Myr) in two nearby spiral galaxies, NGC 628 and NGC 1313. We use Hubble Space Telescope (HST) WFC3/UVIS and archival ACS/WFC data obtained by the L…
Drifting oscillations in axion monodromy
Westphal, Alexander; Flauger, Raphael; McAllister, Liam +1 more
We study the pattern of oscillations in the primordial power spectrum in axion monodromy inflation, accounting for drifts in the oscillation period that can be important for comparing to cosmological data. In these models the potential energy has a monomial form over a super-Planckian field range, with superimposed modulations whose size is model-…
Rise of the Titans: A Dusty, Hyper-luminous “870 µm Riser” Galaxy at z ∼ 6
Marques-Chaves, Rui; Oliver, Seb; Cooray, Asantha +12 more
We report the detection of ADFS-27, a dusty, starbursting major merger at a redshift of z = 5.655, using the Atacama Large Millimeter/submillimeter Array (ALMA). ADFS-27 was selected from Herschel/Spectral and Photometric Imaging Receiver (SPIRE) and APEX/LABOCA data as an extremely red “870 µm riser” (I.e., {S}250µ {{m}}<…
VLT/FORS2 view at z 6: Lyman-α emitter fraction and galaxy physical properties at the edge of the epoch of cosmic reionization
Maiolino, R.; Dickinson, M.; Finkelstein, S. L. +10 more
The fraction of Lyman-α emitters (LAEs) among the galaxy population has been found to increase from z 0 to z 6 and drop dramatically at z> 6. This drop has been interpreted as an effect of an increasingly neutral intergalactic medium (IGM) with increasing redshift, while a Lyman continuum escape fraction evolving with redshift and/or a sudden c…
Temporal Evolution of the High-energy Irradiation and Water Content of TRAPPIST-1 Exoplanets
Delrez, L.; Demory, B. -O.; Ehrenreich, D. +13 more
The ultracool dwarf star TRAPPIST-1 hosts seven Earth-size transiting planets, some of which could harbor liquid water on their surfaces. Ultraviolet observations are essential to measuring their high-energy irradiation and searching for photodissociated water escaping from their putative atmospheres. Our new observations of the TRAPPIST-1 Lyα lin…
Properties of the molecular gas in the fast outflow in the Seyfert galaxy IC 5063
Morganti, Raffaella; Oosterloo, Tom; Combes, Françoise +5 more
We present a detailed study of the properties of the molecular gas in the fast outflow driven by the active galactic nucleus (AGN) in the nearby radio-loud Seyfert galaxy IC 5063. By using ALMA observations of a number of tracers of the molecular gas (12CO(1-0), 12CO(2-1), 12CO(3-2), 13CO(2-1) and HCO