Search Publications
ALMA 1.1 mm Observations of a Conservative Sample of High-redshift Massive Quiescent Galaxies in SHELA
Papovich, Casey; Finkelstein, Steven L.; Bagley, Micaela B. +11 more
We present a sample of 30 massive (log(M */M ⊙) > 11) z = 3-5 quiescent galaxies selected from the Spitzer-HETDEX Exploratory Large Area (SHELA) Survey and observed at 1.1 mm with Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 observations. These ALMA observations would detect even modest levels of dust-obscure…
Discovery of the Exceptionally Short Period Ultracool Dwarf Binary LP 413-53AB
Burgasser, Adam J.; Hsu, Chih-Chun; Theissen, Christopher A.
We report the detection of large-amplitude, rapid radial velocity (RV) variations and line-splitting in high-resolution Keck/NIRSPEC spectra of the M9 dwarf LP 413-53. We attribute these features to binary motion. Analyzing data spanning 15 yr, we infer a preliminary orbital period of 0.7106156 ± 0.0000002 days, an eccentricity of 0.0088 ± 0.0017,…
The Metallicity and Distance of Leo A from Blue Supergiants
Bresolin, Fabio; Kudritzki, Rolf-Peter; Urbaneja, Miguel A.
We have obtained high-quality spectra of blue supergiant candidates in the dwarf irregular galaxy Leo A with the Low Resolution Imaging Spectrometer at the Keck I telescope. From the quantitative analysis of seven B8-A0 stars, we derive a mean metallicity [Z] = -1.35 ± 0.08, in excellent agreement with the gas-phase chemical abundance. From the st…
Understanding the Relationship between Solar Coronal Abundances and F10.7 cm Radio Emission
Long, David M.; Brooks, David H.; Baker, Deborah +7 more
Sun-as-a-star coronal plasma composition, derived from full-Sun spectra, and the F10.7 radio flux (2.8 GHz) have been shown to be highly correlated (r = 0.88) during solar cycle 24. However, this correlation becomes nonlinear during increased solar magnetic activity. Here we use cotemporal, high spatial resolution, multiwavelength images of the Su…
Infrared Ejecta and Cold Dust in the Young Supernova Remnant N132D
Slavin, Jonathan D.; Rho, Jeonghee; Ravi, Aravind P. +1 more
We present Spitzer, Wide-field Infrared Survey Explorer (WISE), and Herschel observations of the young supernova remnant (SNR) N132D in the Large Magellanic Cloud, including 3-40 µm Spitzer Infrared Spectrograph (IRS) mapping, 12 µm WISE and 70, 100, 160, 250, 350, and 500 µm Herschel images. The high-velocity lines of [Ne II] at…
Delayed Development of Cool Plasmas in X-Ray Flares from the Young Sun-like Star κ 1 Ceti
Hamaguchi, Kenji; Toriumi, Shin; Arzoumanian, Zaven +3 more
The Neutron star Interior Composition Explorer (NICER) X-ray observatory observed two powerful X-ray flares equivalent to superflares from the nearby young solar-like star κ 1 Ceti in 2019. NICER follows each flare from the onset through the early decay, collecting over 30 counts s-1 near the peak, enabling a detailed spectra…
The Masses of Supernova Remnant Progenitors in M33
Williams, Benjamin F.; Dolphin, Andrew; Dalcanton, Julianne J. +7 more
Using resolved optical stellar photometry from the Panchromatic Hubble Andromeda Treasury Triangulum Extended Region survey, we measured the star formation history near the position of 85 supernova remnants (SNRs) in M33. We constrained the progenitor masses for 60 of these SNRs, finding that the remaining 25 remnants had no local star formation i…
UV-bright Star-forming Clumps and Their Host Galaxies in UVCANDELS at 0.5 ≤ z ≤ 1
Grogin, Norman A.; Hathi, Nimish P.; Koekemoer, Anton M. +32 more
Giant star-forming clumps are a prominent feature of star-forming galaxies (SFGs) and contain important clues on galaxy formation and evolution. However, the basic demographics of clumps and their host galaxies remain uncertain. Using the Hubble Space Telescope/Wide Field Camera 3 F275W images from the Ultraviolet Imaging of the Cosmic Assembly Ne…
Nebular C IV λ1550 Imaging of the Metal-poor Starburst Mrk 71: Direct Evidence of Catastrophic Cooling
Hayes, Matthew; Jaskot, Anne E.; Östlin, Göran +10 more
We use the Hubble Space Telescope Advanced Camera for Surveys to obtain the first spatially resolved, nebular imaging in the light of C IV λ λ1548, 1551 by using the F150LP and F165LP filters. These observations of the local starburst Mrk 71 in NGC 2366 show emission apparently originating within the interior cavity around the dominant super star …
Revisiting Galaxy Evolution in Morphology in the Cosmic Evolution Survey Field (COSMOS-ReGEM). I. Merging Galaxies
Zheng, Xian Zhong; Cui, Qifan; Li, Nan +3 more
We revisit the evolution of galaxy morphology in the Cosmic Evolution Survey field over the redshift range 0.2 ≤ z ≤ 1, using a large and complete sample of 33,605 galaxies with a stellar mass of log(M */M ⊙) > 9.5 with significantly improved redshifts and comprehensive nonparametric morphological parameters. Our sample ha…