Search Publications
RX J0848.6+4453: The Evolution of Galaxy Sizes and Stellar Populations in a z = 1.27 Cluster
Toft, Sune; Jørgensen, Inger; Chiboucas, Kristin +4 more
RX J0848.6+4453 (Lynx W) at redshift 1.27 is part of the Lynx Supercluster of galaxies. We present an analysis of the stellar populations and star formation history for a sample of 24 members of the cluster. Our study is based on deep optical spectroscopy obtained with Gemini North combined with imaging data from Hubble Space Telescope. Focusing o…
Dusty Disks around Central Stars of Planetary Nebulae
Rauch, Thomas; De Marco, Orsola; Chu, You-Hua +4 more
Only a few percent of cool, old white dwarfs (WDs) have infrared excesses interpreted as originating in small hot disks due to the infall and destruction of single asteroids that come within the star's Roche limit. Infrared excesses at 24 µm were also found to derive from the immediate vicinity of younger, hot WDs, most of which are still ce…
High Resolution Radio and Optical Observations of the Central Starburst in the Low-metallicity Dwarf Galaxy II Zw 40
Johnson, Kelsey E.; Reines, Amy E.; Kepley, Amanda A. +1 more
The extent to which star formation varies in galaxies with low masses, low metallicities, and high star formation rate surface densities is not well constrained. To gain insight into star formation under these physical conditions, this paper estimates the ionizing photon fluxes, masses, and ages for young massive clusters in the central region of …
Constraints on the Binary Properties of Mid- to Late T Dwarfs from Hubble Space Telescope WFC3 Observations
Mora, A.; Martín, E. L.; Solano, E. +4 more
We used Hubble Space Telescope/Wide Field Camera 3 (WFC3) observations of a sample of 26 nearby (<=20 pc) mid- to late T dwarfs to search for cooler companions and measure the multiplicity statistics of brown dwarfs (BDs). Tightly separated companions were searched for using a double point-spread-function-fitting algorithm. We also compared our…
Photometric and Structural Properties of NGC 6544: A Combined VVV-Hubble Space Telescope Study
Cohen, Roger E.; Dotter, Aaron; Geisler, Doug +3 more
We combine archival Hubble Space Telescope imaging with wide-field near-infrared photometry to study the neglected metal-poor Galactic globular cluster NGC 6544. A high spatial resolution map of differential reddening over the inner portion of the cluster is constructed, revealing variations of up to half of the total reddening, and the resulting …
The FUV to Near-IR Morphologies of Luminous Infrared Galaxies in the Goals Sample
Le Floc'h, E.; Surace, J. A.; Inami, H. +9 more
We compare the morphologies of a sample of 20 luminous infrared galaxies (LIRGs) from the Great Observatories All-sky LIRG Survey (GOALS) in the FUV, B, I, and H bands, using the Gini (G) and M20 parameters to quantitatively estimate the distribution and concentration of flux as a function of wavelength. Hubble Space Telescope (HST) ima…
The X-Ray Properties of Five Galactic Supernova Remnants Detected by the Spitzer GLIMPSE Survey
Rho, Jeonghee; Heinke, Craig O.; Pannuti, Thomas G. +1 more
We present a study of the X-ray properties of five Galactic supernova remnants (SNRs)—Kes 17 (G304.6+0.1), G311.5-0.3, G346.6-0.2, CTB 37A (G348.5+0.1), and G348.5-0.0—that were detected in the infrared by Reach et al. in an analysis of data from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) that was conducted by the Spitz…
Outflows, Dusty Cores, and a Burst of Star Formation in the North America and Pelican Nebulae
Ginsburg, Adam; Bally, John; Stringfellow, Guy S. +3 more
We present observations of near-infrared 2.12 µm molecular hydrogen outflows emerging from 1.1 mm dust continuum clumps in the North America and Pelican Nebula (NAP) complex selected from the Bolocam Galactic Plane Survey (BGPS). Hundreds of individual shocks powered by over 50 outflows from young stars are identified, indicating that the du…
X-Ray Observations of Complex Temperature Structure in the Cool-core Cluster A85
Datta, Abhirup; Burns, Jack O.; Schenck, David E. +1 more
X-ray observations were used to examine the complex temperature structure of A85, a cool-core galaxy cluster. Temperature features can provide evidence of merging events which shock heat the intracluster gas. Temperature maps were made from both Chandra and XMM-Newton observations. The combination of a new, long-exposure XMM observation and an imp…
Multi-frequency Observations of a Superbubble in the LMC: The Case of LHA 120-N 70
Haberl, F.; Filipović, M. D.; Maggi, P. +8 more
We present a detailed study of new Australia Telescope Compact Array and XMM-Newton observations of LHA 120-N 70 (hereafter N 70), a spherically shaped object in the Large Magellanic Cloud, classified as a superbubble. Both archival and new observations were used to produce high quality radio continuum, X-ray, and optical images. The radio spectra…