Search Publications
A Massive Molecular Outflow in the Dense Dust Core AGAL G337.916-00.477
Tokuda, Kazuki; Tachihara, Kengo; Kaneda, Hidehiro +9 more
Massive molecular outflows erupting from high-mass young stellar objects (YSOs) provide important clues to understanding the mechanism of high-mass star formation. Based on new CO J = 3-2 and J = 1-0 observations using the Atacama Submillimeter Telescope Experiment (ASTE) and Mopra telescope facilities, we discovered a massive bipolar outflow asso…
A Near-infrared Counterpart of 2E1613.5-5053: The Central Source in Supernova Remnant RCW103
Scholz, P.; Kaspi, V. M.; Tendulkar, S. P. +1 more
On 2016 June 22, 2E 1613.5-5053, the puzzling central compact object in supernova remnant RCW 103 emitted a magnetar-like burst. Using Director’s Discretionary Time, we observed 2E 1613.5-5053 with the Hubble Space Telescope (HST) (WFC3/IR) and we report here on the detection of a previously unseen infrared counterpart. In observations taken on 20…
Spectroscopic Evidence of Alfvén Wave Damping in the Off-limb Solar Corona
Gupta, G. R.
We investigate the off-limb active-region and quiet-Sun corona using spectroscopic data. The active region is clearly visible in several spectral lines formed in the temperature range of 1.1-2.8 MK. We derive the electron number density using the line ratio method, and the nonthermal velocity in the off-limb region up to the distance of 140 Mm. We…
Evidence for Spatially Correlated Gaia Parallax Errors in the Kepler Field
Huber, Daniel; Stello, Dennis; Pinsonneault, Marc H. +1 more
We present evidence for a spatially dependent systematic error in the first data release of Gaia parallaxes based on comparisons to asteroseismic parallaxes in the Kepler field and provide a parameterized model of the angular dependence of these systematics. We report an error of {0.059}-0.004+0.004 mas on scales of 0.°3, whi…
Ion-Ion Equilibration and Particle Distributions in a 3000 km s-1 Shock in SN 1006
Raymond, J. C.; Laming, J. M.; Blair, W. P. +1 more
SN 1006 is the most attractive target for investigating the physics of collisionless shock waves faster than 2000 {km} {{{s}}}-1. We obtained UV and optical spectra and an Hα image of a 3000 {km} {{{s}}}-1 shock driven by a clump of ejecta that has overtaken the blast wave. It is 500 km s-1 faster than the filament…
Clues to the Formation of Spiral Structure in M51 from the Ages and Locations of Star Clusters
Calzetti, Daniela; Schinnerer, Eva; Whitmore, Bradley C. +8 more
We determine the spatial distributions of star clusters at different ages in the grand-design spiral galaxy M51 using a new catalog based on multi-band images taken with the Hubble Space Telescope (HST). These distributions, when compared with the spiral structure defined by molecular gas, dust, young and old stars, show the following sequence in …
Dynamics of Large-scale Coronal Structures as Imaged during the 2012 and 2013 Total Solar Eclipses
Morgan, Huw; Habbal, Shadia R.; Druckmüller, Miloslav +2 more
White light images acquired at the peak of solar activity cycle 24, during the total solar eclipses of 2012 November 13 and 2013 November 3, serendipitously captured erupting prominences accompanied by CMEs. Application of state-of-the-art image processing techniques revealed the intricate details of two “atypical” large-scale structures, with str…
The Multiplicity of M Dwarfs in Young Moving Groups
Yee, Jennifer C.; Montet, Benjamin T.; Bowler, Brendan P. +12 more
We image 104 newly identified low-mass (mostly M-dwarf) pre-main sequence (PMS) members of nearby young moving groups (YMGs) with Magellan Adaptive Optics (MagAO) and identify 27 stellar binaries with instantaneous projected separation as small as 40 mas. Fifteen were previously unknown. The total number of multiple systems in this sample includin…
A Redshift Survey of the Nearby Galaxy Cluster Abell 2199: Comparison of the Spatial and Kinematic Distributions of Galaxies with the Intracluster Medium
Hwang, Ho Seong; Park, Changbom; Song, Hyunmi +1 more
We present the results from an extensive spectroscopic survey of the central region of the nearby galaxy cluster Abell 2199 (A2199) at z = 0.03. By combining 775 new redshifts from the MMT/Hectospec observations with the data in the literature, we construct a large sample of 1624 galaxies with measured redshifts at R< 30\prime , whic…
3D Magnetohydrodynamic Models of Nonthermal Photon Emission in the Binary System γ 2 Velorum
Reimer, A.; Reimer, O.; Kissmann, R. +1 more
Recent reports claiming an association of the massive star binary system {γ }2 Velorum (WR 11) with a high-energy γ-ray source observed by Fermi-LAT contrast the so far exclusive role of η Carinae as the hitherto only detected γ-ray emitter in the source class of particle-accelerating colliding-wind binary (CWB) systems. We offer suppor…