Search Publications
The REASONS Survey: Resolved Millimeter Observations of a Large Debris Disk around the Nearby F Star HD 170773
MacGregor, Meredith A.; Matthews, Brenda C.; Wilner, David J. +15 more
Debris disks are extrasolar analogs to our own Kuiper Belt and they are detected around at least 17% of nearby Sun-like stars. The morphology and dynamics of a disk encode information about its history, as well as that of any exoplanets within the system. We used the Atacama Large Millimeter/submillimeter Array (ALMA) to obtain 1.3 mm observations…
The Quick and the Dead: Finding the Surviving Binary Companions of Galactic Supernovae with Gaia
Boubert, Douglas; Fraser, Morgan
We use Gaia Data Release 2 to search for possible surviving binary companions to three of the best-studied historical Milky Way core-collapse supernovae. Consistent with previous work, we find there to be no plausible binary companion to either the Crab or Cas A supernovae. For the first time, we present a systematic search for a former companion …
Bundle adjustment of satellite images based on an equivalent geometric sensor model with digital elevation model
Cao, Hui; Tao, Pengjie; Li, Haihong +1 more
High-precision georeferencing of satellite stereo images becomes a key issue in multi-source data integration, geometric processing, and analysis for many remote sensing applications. Using existing geographic data, including readily available public data, as geometric reference for georeferencing satellite imagery is an effective and feasible way…
First Subarcsecond Submillimeter-wave [C I] Image of 49 Ceti with ALMA
Iwasaki, Kazunari; Yamamoto, Satoshi; Sakai, Nami +7 more
We present the first subarcsecond images of 49 Ceti in the [C I] 3 P 1-3 P 0 emission and the 614 µm dust continuum emission observed with Atacama Large Millimeter/submillimeter Array (ALMA), as well as that in the CO(J = 3-2) emission prepared by using the ALMA archival data. The spatial distribut…
Correlation between SFR Surface Density and Thermal Pressure of Ionized Gas in Local Analogs of High-redshift Galaxies
Malhotra, Sangeeta; Yang, Huan; Rhoads, James E. +1 more
We explore the relation between the star formation rate surface density (ΣSFR) and the interstellar gas pressure for nearby compact starburst galaxies. The sample consists of 17 green peas and 19 Lyman break analogs (LBAs). Green peas are nearby analogs of Lyα emitters at high redshift and LBAs are nearby analogs of Lyman break galaxies at high re…
Interplanetary Coronal Mass Ejections During Solar Cycles 23 and 24: Sun-Earth Propagation Characteristics and Consequences at the Near-Earth Region
Joshi, Bhuwan; Cho, K. -S.; Moon, Y. -J. +2 more
In this article, we present a statistical study probing the relation between interplanetary coronal mass ejections (ICMEs) observed at 1 AU and their corresponding coronal mass ejections at the near-Sun region. The work encompasses the ICME activity that occurred during Solar Cycles 23 and 24 (1996 - 2017) while presenting an overall picture of IC…
Fragmentation and filaments at the onset of star and cluster formation. SABOCA 350 µm view of ATLASGAL-selected massive clumps
Menten, K. M.; Weiss, A.; Csengeri, T. +4 more
Context. The structure formation of the dense interstellar material and the fragmentation of clumps into cores is a fundamental step for understanding how stars and stellar clusters form.
Aims: We aim to establish a statistical view of clump fragmentation at subparsec scales based on a large sample of massive clumps selected from the ATLASGAL…
On the Coronal Mass Ejection Detection Rate during Solar Cycles 23 and 24
Gopalswamy, Nat; Yashiro, Seiji; Michalek, Grzegorz
The Solar and Heliospheric Observatory (SOHO) mission’s white light coronagraphs have observed more than 25,000 coronal mass ejections (CMEs) from 1996 January to the end of 2015 July. This period of time covers almost two solar cycles (23 and 24). The basic attributes of CMEs, reported in the SOHO/Large Angle and Spectrometric Coronagraph (LASCO)…
HERBS I: Metallicity and alpha enhancement along the Galactic bulge minor axis
Freeman, K. C.; Nataf, D. M.; Asplund, M. +3 more
To better understand the origin and evolution of the Milky Way bulge, we have conducted a survey of bulge red giant branch and clump stars using the High Efficiency and Resolution Multi-Element Spectrograph on the Anglo-Australian Telescope. We targeted ARGOS survey stars with predetermined bulge memberships, covering the full metallicity distribu…
Solar Filament Eruptions as Precursors to Flare-CME Events: Establishing the Temporal Connection
Nandy, Dibyendu; Srivastava, Nandita; Sinha, Suvadip
Elongated structures on the Sun’s surface known as filaments are known to have a connection with energetic events of space weather consequence (flares and coronal mass ejections (CMEs)). In this work, we explore the connection between the eruptive dynamics of filaments and the initiation of solar flares and CMEs. We estimate the filament eruption …