Search Publications
Observations of Umbral Flashes and Running Sunspot Waves with the Interface Region Imaging Spectrograph
DeLuca, Edward E.; Tian, Hui; Madsen, Chad A.
We present simultaneous, high-resolution, multi-temperature observations of running waves and umbral flashes in a sunspot with the Interface Region Imaging Spectrograph. We analyze intensity variations in slit-jaw images to investigate the relationship between running waves in the 1400 Å (Si IV/transition region) passband and umbral flashes in the…
SXDF-ALMA 1.5 arcmin2 Deep Survey: A Compact Dusty Star-forming Galaxy at z = 2.5
Tamura, Yoichi; Kohno, Kotaro; Caputi, Karina I. +23 more
We present the first results from the SXDF-Atacama Large Millimeter/submillimeter Array (ALMA) 1.5 arcmin2 deep survey at 1.1 mm using ALMA. The map reaches a 1σ depth of 55 µJy/beam and covers 12 Hα-selected star-forming galaxies (SFGs) at z = 2.19 or z = 2.53. We have detected continuum emission from three of our Hα-selected sam…
Detection of a Distinct Metal-poor Stellar Halo in the Early-type Galaxy NGC 3115†
Romanowsky, Aaron J.; Brodie, Jean P.; Strader, Jay +1 more
We present the resolved stellar populations in the inner and outer halo of the nearby lenticular galaxy NGC 3115. Using deep Hubble Space Telescope observations, we analyze stars 2 mag fainter than the tip of the red giant branch (TRGB). We study three fields along the minor axis of this galaxy, 19, 37, and 54 kpc from its center—corresponding to …
Prediction of Solar Flare Size and Time-to-Flare Using Support Vector Machine Regression
McAteer, R. T. James; Boucheron, Laura E.; Al-Ghraibah, Amani
We study the prediction of solar flare size and time-to-flare using 38 features describing magnetic complexity of the photospheric magnetic field. This work uses support vector regression to formulate a mapping from the 38-dimensional feature space to a continuous-valued label vector representing flare size or time-to-flare. When we consider flari…
A Physical Approach to the Identification of High-z Mergers: Morphological Classification in the Stellar Mass Domain.
Daddi, E.; Elbaz, D.; Le Floc'h, E. +6 more
At z ≳ 1, the distinction between merging and “normal” star-forming galaxies based on single band morphology is often hampered by the presence of large clumps which result in a disturbed, merger-like appearance even in rotationally supported disks. In this paper we discuss how a classification based on canonical, non-parametric structural indices …
Characterizing the Youngest Herschel-detected Protostars. I. Envelope Structure Revealed by CARMA Dust Continuum Observations
Henning, Thomas; Manoj, P.; Ragan, Sarah E. +8 more
We present Combined Array for Research in Millimeter-wave Astronomy 2.9 mm dust continuum emission observations of a sample of 14 Herschel-detected Class 0 protostars in the Orion A and B molecular clouds, drawn from the PACS Bright Red Sources (PBRS) sample. These objects are characterized by very red 24-70 µm colors and prominent submillim…
Stellar Masses and Star Formation Rates of Lensed, Dusty, Star-forming Galaxies from the SPT Survey
Béthermin, M.; Weiss, A.; Greve, T. R. +18 more
To understand cosmic mass assembly in the universe at early epochs, we primarily rely on measurements of the stellar masses and star formation rates (SFRs) of distant galaxies. In this paper, we present stellar masses and SFRs of six high-redshift (2.8 ≤ z ≤ 5.7) dusty, star-forming galaxies (DSFGs) that are strongly gravitationally lensed by fore…
HST/ACS Direct Ages of the Dwarf Elliptical Galaxies NGC 147 and NGC 185
Geha, M.; van der Marel, R. P.; Guhathakurta, P. +3 more
We present the deepest optical photometry for any dwarf elliptical (dE) galaxy based on Hubble Space Telescope Advanced Camera for Surveys (ACS) observations of the Local Group dE galaxies NGC 147 and NGC 185. Our F606W and F814W color-magnitude diagrams are the first to reach below the oldest main sequence turnoff in a dE galaxy, allowing us to d…
Deconstructing Thermal Sunyaev-Zel’dovich - Gravitational Lensing Cross-correlations: Implications for the Intracluster Medium
Battaglia, N.; Hill, J. C.; Murray, N.
Recent first detections of the cross-correlation of the thermal Sunyaev-Zel’dovich (tSZ) signal in Planck cosmic microwave background (CMB) temperature maps with gravitational lensing maps inferred from the Planck CMB data and the CFHTLenS galaxy survey provide new probes of the relationship between baryons and dark matter. Using cosmological hydr…
Chemically Distinct Nuclei and Outflowing Shocked Molecular Gas in Arp 220
Sturm, E.; Greve, T. R.; Planesas, P. +9 more
We present the results of interferometric spectral line observations of Arp 220 at 3.5 mm and 1.2 mm from the Plateau de Bure Interferometer, imaging the two nuclear disks in H13CN(1-0) and (3-2), H13CO+(1-0) and (3-2), and HN13C(3-2) as well as SiO(2-1) and (6-5), HC15N(3-2), and SO(66