Search Publications
The First Naked-eye Superflare Detected from Proxima Centauri
Loyd, R. O. Parke; Law, Nicholas M.; Youngblood, Allison +11 more
Proxima b is a terrestrial-mass planet in the habitable zone of Proxima Centauri. Proxima Centauri’s high stellar activity, however, casts doubt on the habitability of Proxima b: sufficiently bright and frequent flares and any associated proton events may destroy the planet’s ozone layer, allowing lethal levels of UV flux to reach its surface. In …
The HST Large Programme on ω Centauri. II. Internal Kinematics
Milone, Antonino P.; Anderson, Jay; van der Marel, Roeland P. +7 more
In this second installment of the series, we look at the internal kinematics of the multiple stellar populations of the globular cluster ω Centauri in one of the parallel Hubble Space Telescope (HST) fields, located at about 3.5 half-light radii from the center of the cluster. Thanks to the over 15 yr long baseline and the exquisite astrometric pr…
Clumpy Galaxies in CANDELS. II. Physical Properties of UV-bright Clumps at 0.5 ≤ z < 3
Pérez-González, Pablo G.; Bell, Eric F.; Ferguson, Henry C. +20 more
Studying giant star-forming clumps in distant galaxies is important to understand galaxy formation and evolution. At present, however, observers and theorists have not reached a consensus on whether the observed “clumps” in distant galaxies are the same phenomenon that is seen in simulations. In this paper, as a step to establish a benchmark of di…
A Survey of CH3CN and HC3N in Protoplanetary Disks
Bergner, Jennifer B.; Loomis, Ryan A.; Öberg, Karin I. +2 more
The organic content of protoplanetary disks sets the initial compositions of planets and comets, thereby influencing subsequent chemistry that is possible in nascent planetary systems. We present observations of the complex nitrile-bearing species CH3CN and HC3N toward the disks around the T Tauri stars AS 209, IM Lup, LkCa 1…
The Gould's Belt Distances Survey (GOBELINS). IV. Distance, Depth, and Kinematics of the Taurus Star-forming Region
Kounkel, Marina; Heyer, Mark; Rodríguez, Luis F. +13 more
We present new trigonometric parallaxes and proper motions of young stellar objects in the Taurus molecular cloud complex from observations collected with the Very Long Baseline Array as part of the Gould’s Belt Distances Survey. We detected 26 young stellar objects and derived trigonometric parallaxes for 18 stars with an accuracy of 0.3% to a fe…
A Galaxy-scale Fountain of Cold Molecular Gas Pumped by a Black Hole
Simionescu, A.; Fabian, A. C.; Gaspari, M. +36 more
We present Atacama Large Millimeter/submillimeter Array and Multi-Unit Spectroscopic Explorer observations of the brightest cluster galaxy in Abell 2597, a nearby (z = 0.0821) cool core cluster of galaxies. The data map the kinematics of a three billion solar mass filamentary nebula that spans the innermost 30 kpc of the galaxy’s core. Its warm io…
SHINING, A Survey of Far-infrared Lines in Nearby Galaxies. II. Line-deficit Models, AGN Impact, [C II]-SFR Scaling Relations, and Mass-Metallicity Relation in (U)LIRGs
Lutz, D.; Genzel, R.; Maiolino, R. +12 more
The SHINING survey offers a great opportunity to study the properties of the ionized and neutral media of galaxies from prototypical starbursts and active galactic nuclei (AGNs) to heavily obscured objects. Based on Herschel/PACS observations of the main far-infrared (FIR) fine-structure lines, in this paper, we analyze the physical mechanisms beh…
The Proper Motion Field of the Small Magellanic Cloud: Kinematic Evidence for Its Tidal Disruption
Kochanek, C. S.; van der Marel, Roeland P.; Anderson, J. +9 more
We present a new measurement of the systemic proper motion of the Small Magellanic Cloud (SMC), based on an expanded set of 30 fields containing background quasars and spanning a ∼3 year baseline, using the Hubble Space Telescope (HST) Wide Field Camera 3. Combining this data with our previous five HST fields, and an additional eight measurements …
Measuring the Value of the Hubble Constant “à la Refsdal”
Treu, T.; Grillo, C.; Balestra, I. +8 more
Realizing Refsdal’s original idea from 1964, we present estimates of the Hubble constant that are complementary to, and potentially competitive with, those of other cosmological probes. We use the observed positions of 89 multiple images, with extensive spectroscopic information, from 28 background sources and the measured time delays between the …
A New Look at T Tauri Star Forbidden Lines: MHD-driven Winds from the Inner Disk
Fang, Min; Pascucci, Ilaria; Edwards, Suzan +6 more
Magnetohydrodynamic (MHD) and photoevaporative winds are thought to play an important role in the evolution and dispersal of planet-forming disks. We report the first high-resolution (Δv ∼ 6 km s-1) analysis of [S II] λ4068, [O I] λ5577, and [O I] λ6300 lines from a sample of 48 T Tauri stars. Following Simon et al. we decompose them in…