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Is this an early stage merger? A case study on molecular gas and star formation properties of Arp 240
Wilson, C. D.; Iono, Daisuke; Saito, Toshiki +2 more
We present new high-resolution 12CO J = 1-0, J = 2-1, and 13CO J = 1-0 maps of the early stage merger Arp 240 (NGC 5257/8) obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). Simulations in the literature suggest that the merger has just completed its first passage; however, we find that this system has a l…
A Survey for C II Emission-line Stars in the Large Magellanic Cloud
Massey, Philip; Morrell, Nidia; Neugent, Kathryn F. +1 more
We present a narrowband imaging survey of the Large Magellanic Cloud (LMC), designed to isolate the C II λλ7231, 7236 emission lines in objects as faint as mλ7400 ∼ 18. The work is motivated by the recent serendipitous discovery in the LMC of the first confirmed extragalactic [WC11] star, whose spectrum is dominated by C II emission, an…
The Solar Orbiter mission
Forveille, Thierry; Shore, Steve
Time-domain Study of the Young Massive Cluster Westerlund 2 with the Hubble Space Telescope. I
Anderson, J.; Lennon, D. J.; Bastian, N. +8 more
Time-domain studies of pre-main-sequence (PMS) stars have long been used to investigate star properties during their early evolutionary phases and to trace the evolution of circumstellar environments. Historically these studies have been confined to the nearest, low-density, star-forming regions. We used the Wide Field Camera 3 on board the Hubble…
A High Angular Resolution Survey of Massive Stars in Cygnus OB2: JHK Adaptive Optics Results from the Gemini Near-Infrared Imager
Goodwin, S. P.; Gies, D. R.; ten Brummelaar, T. A. +8 more
We present results of a high angular resolution survey of massive OB stars in the Cygnus OB2 association that we conducted with the Near-Infrared Imager camera and ALTAIR adaptive optics system of the Gemini North telescope. We observed 74 O- and early-B-type stars in Cyg OB2 in the JHK infrared bands in order to detect binary and multiple compani…
New Expansion Rate Estimate of the Scorpius-Centaurus Association Based on T Tauri Stars from the Gaia DR2 Catalog
Bobylev, V. V.; Baykova, A. T.
The kinematic properties of the Scorpius-Centaurus association were studied using spatial velocities of approximately 700 young T Tauri stars. Their proper motions and trigonometric parallaxes were selected by Zari et al. from the Gaia DR2 catalog, and radial velocities were taken from various sources. The linear expansion coefficient's new estima…
Spinning Bar and a Star-formation Inefficient Repertoire: Turbulence in Hickson Compact Group NGC 7674
Kewley, Lisa J.; Federrath, Christoph; Groves, Brent +2 more
The physics regulating star formation (SF) in Hickson Compact Groups (HCG) has thus far been difficult to describe, due to their unique kinematic properties. In this study, we expand upon previous works to devise a more physically meaningful SF relation able to better encompass the physics of these unique systems. We combine CO(1-0) data from the …
Limitations in the determination of surface emission distributions on comets through modelling of observational data - A case study based on Rosetta observations
Thomas, Nicolas; Marschall, Raphael; Wu, Jong-Shinn +1 more
The European Space Agency's (ESA) Rosetta mission has returned a vast data set of measurements of the inner gas coma of comet 67/Churyumov-Gerasimenko. These measurements have been used by different groups to determine the distribution of the gas sources at the nucleus surface. The solutions that have been found differ from each other substantiall…
Heliospheric Maps from Cassini INCA Early in the Cruise to Saturn
Mitchell, D. G.; Krimigis, S.; Clark, G. +8 more
We present new energetic neutral atom (ENA) maps from the Ion and Neutral Camera (INCA) instrument on Cassini from the year 2000, prior to Cassini's encounter with Jupiter. These maps are the first produced for the year 2000 and are the only maps with comprehensive spatial coverage from the peak of solar cycle 23. These ENA maps span the energy ra…
CMEchaser, Detecting Line-of-Sight Occultations Due to Coronal Mass Ejections
Zucca, Pietro; Shaifullah, Golam; Tiburzi, Caterina
We present a python-based tool to detect the occultation of back-ground sources by foreground solar coronal mass ejections. The tool takes as input standard celestial coordinates of the source and translates those to the helioprojective plane, and is thus well suited for use with a wide variety of background astronomical sources. This tool provide…