Search Publications
Observations of Short-period Current Sheet Flapping Events in the Earth's Magnetotail
Deng, X. H.; Huang, S. Y.; Xu, S. B. +9 more
The flapping motion of the current sheet, with the period from several minutes to tens of minutes, is one common dynamic phenomenon in the planetary magnetotail. This Letter reports on one current sheet flapping event with the short semi-period of ∼6 s on 2017 July 17 in the Earth’s magnetotail for the first time using the Magnetospheric Multiscal…
ALMA Reveals Kinematics of Super Star Cluster Candidate H72.97-69.39 in LMC-N79
Indebetouw, R.; Nayak, O.; Meixner, M. +6 more
Conditions in super star clusters (SSCs) lead to the formation of dozens of massive stars in close proximity. However, SSCs are rare in the local universe. H72.97-69.39, located in the N79 region of the Large Magellanic Cloud (LMC), is an SSC candidate. In this paper we report the ALMA observations of the potential SSC. ALMA reveals colliding fila…
Antlia 2’s Role in Driving the Ripples in the Outer Gas Disk of the Galaxy
Hernquist, Lars; Price-Whelan, Adrian M.; Chang, Philip +3 more
We employ the earlier published proper motions of the newly discovered Antlia 2 dwarf galaxy derived from Gaia data to calculate its orbital distribution in the cosmologically recent past. Using these observationally motivated orbits, we calculate the effect of the Antlia 2 dwarf galaxy on the outer H I disk of the Milky Way, using both test parti…
SPIRE Spectroscopy of Early-type Galaxies
Young, Lisa M.; Lapham, Ryen Carl
We present Spectral and Photometric Imaging Receiver (SPIRE) spectroscopy for nine early-type galaxies (ETGs) representing the most CO-rich and far-infrared (FIR) bright galaxies of the volume-limited Atlas3D sample. Our data include detections of mid- to high-J CO transitions (J = 4-3 to J = 13-12) and the [C I] (1-0) and (2-1) emission lines. CO…
The z = 0.54 LoBAL Quasar SDSS J085053.12+445122.5. II. The Nature of Partial Covering in the Broad-absorption-line Outflow
Gallagher, Sarah C.; Terndrup, Donald M.; Leighly, Karen M. +5 more
It has been known for 20 years that the absorbing gas in broad-absorption-line quasars does not completely cover the continuum emission region, and that partial covering must be accounted for to accurately measure the column density of the outflowing gas. However, the nature of partial covering itself is not understood. Extrapolation of the SimBAL…
The Nearby, Young, χ 1 Fornacis Cluster: Membership, Age, and an Extraordinary Ensemble of Dusty Debris Disks
Zuckerman, B.; Kastner, Joel; Klein, Beth
Only four star clusters are known within ∼100 pc of Earth. Of these, the χ 1 For cluster has barely been studied. We use the Gaia DR2 catalog and other published data to establish the cluster membership, structure, and age. The age of and distance to the cluster are ∼40 Myr and 104 pc, respectively. A remarkable, unprecedented aspect of…
A Very Large Array Survey of Luminous Extranuclear Star-forming Regions in Luminous Infrared Galaxies in GOALS
Surace, J. A.; Murphy, E. J.; Momjian, E. +13 more
We present the first results of a high-resolution Karl G. Jansky Very Large Array imaging survey of luminous and ultra-luminous infrared galaxies (U/LIRGs) in the Great Observatories All-sky LIRG Survey. From the full sample of 68 galaxies, we have selected 25 luminous infrared galaxies (LIRGs) that show resolved extended emission at sufficient se…
High-redshift Massive Quiescent Galaxies Are as Flat as Star-forming Galaxies: The Flattening of Galaxies and the Correlation with Structural Properties in CANDELS/3D-HST
Franx, Marijn; Muzzin, Adam; van Dokkum, Pieter +5 more
We investigate the median flattening of galaxies at 0.2 < z < 4.0 in all five CANDELS/3D-HST fields via the apparent axis ratio, q. We separate the sample into bins of the redshift, stellar mass, Sérsic index, size, and UVJ-determined star-forming state to discover the most important drivers of the median q (q med). Quiescent gala…
Physical Constraints from Near-infrared Fast Photometry of the Black Hole Transient GX 339-4
Petrucci, P.; Gandhi, P.; Tomsick, J. A. +9 more
We present results from the first multi-epoch X-ray/IR fast-photometry campaign on the black hole transient GX 339-4, during its 2015 outburst decay. We studied the evolution of the power spectral densities finding strong differences between the two bands. The X-ray power spectral density follows standard patterns of evolution, plausibly reflectin…
High-resolution Extinction Map in the Direction of the Bulge Globular Cluster NGC 6440
Pallanca, Cristina; Ferraro, Francesco R.; Lanzoni, Barbara +3 more
We used optical images acquired with the UVIS channel of the Wide Field Camera 3 on board the Hubble Space Telescope to construct the first high-resolution extinction map in the direction of NGC 6440, a globular cluster located in the bulge of our Galaxy. The map has a spatial resolution of 0.″5 over a rectangular region of about 160″ × 240″ aroun…