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The Breakthrough Listen Search for Intelligent Life: MeerKAT Target Selection
de Pater, Imke; DeBoer, David; Gajjar, Vishal +18 more
New radio telescope arrays offer unique opportunities for large-scale commensal SETI surveys. Ethernet-based architectures are allowing multiple users to access telescope data simultaneously by means of multicast Ethernet subscriptions. Breakthrough Listen will take advantage of this by conducting a commensal SETI survey on the MeerKAT radio teles…
Variable stars in the VVV globular clusters. II. NGC 6441, NGC 6569, NGC 6626 (M 28), NGC 6656 (M 22), 2MASS-GC 02, and Terzan 10
Carballo-Bello, Julio A.; Smith, Leigh C.; Minniti, Dante +18 more
Context. The Galactic globular clusters (GGCs) located in the inner regions of the Milky Way suffer from high extinction that makes their observation challenging. High densities of field stars in their surroundings complicate their study even more. The VISTA Variables in the Via Lactea (VVV) survey provides a way to explore these GGCs in the near-…
(6478) Gault: physical characterization of an active main-belt asteroid
Skiff, Brian A.; Rivet, Jean-Pierre; Bendjoya, Philippe +22 more
In 2018 December, the main-belt asteroid (6478) Gault was reported to display activity. Gault is an asteroid belonging to the Phocaea dynamical family and was not previously known to be active, nor was any other member of the Phocaea family. In this work, we present the results of photometric and spectroscopic observations that commenced soon afte…
Precision Millimeter Astrometry of the α Centauri AB System
Kervella, Pierre; Beichman, Charles; Benedict, G. Fritz +2 more
Alpha Centauri A is the closest solar-type star to the Sun and offers the best opportunity to find and ultimately to characterize an Earth-sized planet located in its habitable zone. Here, we describe initial results from an Atacama Large Millimeter/submillimeter Array (ALMA) program to search for planets in the α Cen AB system using differential …
Gas compression and stellar feedback in the tidally interacting and ram-pressure stripped Virgo spiral galaxy NGC 4654
Braine, J.; Vollmer, B.; Lizée, T. +1 more
Due to an environment that promotes gravitational interactions and ram pressure stripping, galaxies within clusters are particularly likely to present unusual interstellar medium (ISM) properties. NGC 4654 is a Virgo cluster galaxy seen almost face-on, which undergoes nearly edge-on gas ram pressure stripping and a fly-by gravitational interaction…
Slowly cooling white dwarfs in M13 from stable hydrogen burning
Cadelano, Mario; Pallanca, Cristina; Dalessandro, Emanuele +5 more
White dwarfs (WDs) are the final evolutionary product of the vast majority of stars in the Universe. They are electron-degenerate structures characterized by no stable thermonuclear activity, and their evolution is generally described as a pure cooling process. Their cooling rate is adopted as cosmic chronometer to constrain the age of several Gal…
The Black Hole Mass of NGC 4151 from Stellar Dynamical Modeling
Vasiliev, Eugene; Onken, Christopher A.; Bentz, Misty C. +2 more
The mass of a supermassive black hole (MBH) is a fundamental property that can be obtained through observational methods. Constraining MBH through multiple methods for an individual galaxy is important for verifying the accuracy of different techniques and for investigating the assumptions inherent in each method. However, th…
Lava Flow Eruption Conditions in the Tharsis Volcanic Province on Mars
Christensen, P. R.; Peters, S. I.; Clarke, A. B.
Volcanism has played a major role in modifying the Martian surface. The Tharsis volcanic province dominates the western hemisphere of the planet with numerous effusive volcanic constructs and deposits. Here, we present the results of an in-depth study aimed at characterizing and modeling the emplacement conditions of 40 lava flows in the Tharsis v…
The evolution of the low-density H I> intergalactic medium from z = 3.6 to 0: data, transmitted flux, and H I> column density,
Savage, B. D.; Wakker, B. P.; Viel, M. +8 more
We present a new, uniform analysis of the H I transmitted flux (F) and H I column density ($N_{\mathrm{H\,{\small I}}}$) distribution in the low-density IGM as a function of redshift z for 0 < z < 3.6 using 55 HST/COS FUV (Δz = 7.2 at z < 0.5), five HST/STIS + COS NUV (Δz = 1.3 at z ~ 1) and 24 VLT/UVES, and Keck/HIRES (Δz = 11.6 at 1.7 &…
Correlated X-Ray and Optical Variability in the O-type Supergiant ζ Puppis
Moffat, Anthony F. J.; Richardson, Noel D.; Nichols, Joy S. +11 more
Analysis of the recent long exposure Chandra X-ray observation of the early-type O star ζ Pup shows clear variability with a period previously reported in optical photometric studies. These 813 ks of HETGS observations taken over a roughly one-year time span have two signals of periodic variability: (1) a high-significance period of 1.7820 ± 0.000…