Search Publications
The Y-type Brown Dwarfs: Estimates of Mass and Age from New Astrometry, Homogenized Photometry, and Near-infrared Spectroscopy
Luhman, K. L.; Tremblin, P.; Morley, Caroline V. +2 more
The survey of the mid-infrared sky by the Wide-field Infrared Survey Explorer (WISE) led to the discovery of extremely cold, low-mass brown dwarfs, classified as Y dwarfs, which extend the T class to lower temperatures. Twenty-four Y dwarfs are known at the time of writing. Here we present improved parallaxes for four of these, determined using Sp…
X-Ray and Radio Observations of the Magnetar SGR J1935+2154 during Its 2014, 2015, and 2016 Outbursts
Göğüş, Ersin; Kouveliotou, Chryssa; Lin, Lin +10 more
We analyzed broadband X-ray and radio data of the magnetar SGR J1935+2154 taken in the aftermath of its 2014, 2015, and 2016 outbursts. The source soft X-ray spectrum <10 keV is well described with a blackbody+power-law (BB+PL) or 2BB model during all three outbursts. Nuclear Spectroscopic Telescope Array observations revealed a hard X-ray tail…
A Multiple Flux-tube Solar Wind Model
Rouillard, Alexis P.; Pinto, Rui F.
We present a new model, MULTI-VP, which computes the three-dimensional structure of the solar wind and includes the chromosphere, the transition region, and the corona and low heliosphere. MULTI-VP calculates a large ensemble of wind profiles flowing along open magnetic field lines that sample the entire three-dimensional atmosphere or, alternativ…
The Circumstellar Disk HD 169142: Gas, Dust, and Planets Acting in Concert?
Pinte, C.; Ménard, F.; van der Plas, G. +34 more
HD 169142 is an excellent target for investigating signs of planet-disk interaction due to previous evidence of gap structures. We perform J-band (∼1.2 µm) polarized intensity imaging of HD 169142 with VLT/SPHERE. We observe polarized scattered light down to 0.″16 (∼19 au) and find an inner gap with a significantly reduced scattered-light fl…
ALMA Observations of Gas-rich Galaxies in z ∼ 1.6 Galaxy Clusters: Evidence for Higher Gas Fractions in High-density Environments
Cooper, M. C.; van Kampen, E.; Demarco, R. +16 more
We present ALMA CO (2-1) detections in 11 gas-rich cluster galaxies at z ∼ 1.6, constituting the largest sample of molecular gas measurements in z > 1.5 clusters to date. The observations span three galaxy clusters, derived from the Spitzer Adaptation of the Red-sequence Cluster Survey. We augment the >5σ detections of the CO (2-1) fluxes wi…
Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. V. The Rapid Rotation of 47 Tuc Traced and Modeled in Three Dimensions
Anderson, J.; Piotto, G.; Vesperini, E. +5 more
High-precision proper motions of the globular cluster 47 Tuc have allowed us to measure for the first time the cluster rotation in the plane of the sky and the velocity anisotropy profile from the cluster core out to about 13‧. These profiles are coupled with prior measurements along the line of sight (LOS) and the surface brightness profile and f…
Buried AGNs in Advanced Mergers: Mid-infrared Color Selection as a Dual AGN Candidate Finder
Ellison, Sara L.; Ricci, Claudio; Blecha, Laura +7 more
A direct consequence of hierarchical galaxy formation is the existence of dual supermassive black holes, which may be preferentially triggered as active galactic nuclei (AGNs) during galaxy mergers. Despite decades of searching, however, dual AGNs are extremely rare, and most have been discovered serendipitously. Using the all-sky WISE survey, we …
Intermittent Reconnection and Plasmoids in UV Bursts in the Low Solar Atmosphere
De Pontieu, B.; Martínez-Sykora, J.; Hansteen, V. H. +9 more
Magnetic reconnection is thought to drive a wide variety of dynamic phenomena in the solar atmosphere. Yet, the detailed physical mechanisms driving reconnection are difficult to discern in the remote sensing observations that are used to study the solar atmosphere. In this Letter, we exploit the high-resolution instruments Interface Region Imagin…
Rotating Starburst Cores in Massive Galaxies at z = 2.5
Übler, Hannah; Tamura, Yoichi; Kohno, Kotaro +21 more
We present spatially resolved ALMA observations of the CO J=3-2 emission line in two massive galaxies at z = 2.5 on the star-forming main sequence. Both galaxies have compact dusty star-forming cores with effective radii of {R}{{e}}=1.3+/- 0.1 {kpc} and {R}{{e}}=1.2+/- 0.1 {kpc} in the 870 µm continuum emission. The spa…
A Submillimeter Perspective on the GOODS Fields (SUPER GOODS). I. An Ultradeep SCUBA-2 Survey of the GOODS-N
Wang, W. -H.; Owen, F. N.; Barger, A. J. +3 more
In this first paper in the SUPER GOODS series on powerfully star-forming galaxies in the two GOODS fields, we present a deep SCUBA-2 survey of the GOODS-N at both 850 and 450 µm (central rms noise of 0.28 mJy and 2.6 mJy, respectively). In the central region, the 850 µm observations cover the GOODS-N to near the confusion limit of ∼1.6…