Search Publications
The Filamentary Radio Lobes of the Seyfert-Starburst Composite Galaxy NGC 3079
O'Dea, C. P.; Baum, S. A.; Kharb, P. +2 more
We present results from multifrequency polarization-sensitive Very Large Array observations of the Seyfert-starburst composite galaxy NGC 3079. Our sensitive radio observations reveal a plethora of radio “filaments” comprising the radio lobes in this galaxy. We analyze the origin of these radio filaments in the context of existing Chandra X-ray an…
Magnetic Field Strengths and Variations in Grain Alignment in the Local Bubble Wall
Andersson, B. -G.; Medan, Ilija
Optical and infrared continuum polarization from the interstellar medium is known to generally be due to irregular dust grains aligned with the magnetic field. This provides an important tool to probe the geometry and strength of those fields, particularly if the variations in the grain alignment efficiencies can be understood. Here, we examine po…
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 …
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…
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)…
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 …
Multiwavelength Analysis of the Merging Galaxy Cluster A115
van Weeren, R. J.; Dawson, W. A.; Jee, M. James +4 more
A115 is a merging galaxy cluster at z ∼ 0.2 with a number of remarkable features, including a giant (∼2.5 Mpc) radio relic, two asymmetric X-ray peaks with trailing tails, and a peculiar line-of-sight velocity structure. We present a multiwavelength study of A115 using optical imaging data from Subaru, X-ray data from Chandra, and spectroscopic da…
Surveying the Giant H II Regions of the Milky Way with SOFIA. I. W51A
Lim, Wanggi; De Buizer, James M.
We discuss the first results from our mid-infrared (MIR) imaging survey of Milky Way Giant H II (GH II) regions with our detailed analysis of W51A, which is one of the largest GH II regions in our Galaxy. We used the FORCAST instrument on the Stratospheric Observatory For Infrared Astronomy (SOFIA) to obtain 20 and 37 µm images of the centra…