Search Publications
Dust in historical Galactic Type Ia supernova remnants with Herschel
Ivison, R. J.; Henning, Th.; Krause, O. +13 more
The origin of interstellar dust in galaxies is poorly understood, particularly the relative contributions from supernovae and the cool stellar winds of low-intermediate-mass stars. Recently, large masses of newly formed dust have been discovered in the ejecta of core-collapse supernovae. Here, we present Herschel Photodetector Array Camera and Spe…
Resolved Near-infrared Stellar Populations in Nearby Galaxies
de Jong, Roelof S.; Williams, Benjamin F.; Boyer, Martha L. +10 more
We present near-infrared (NIR) color-magnitude diagrams (CMDs) for the resolved stellar populations within 26 fields of 23 nearby galaxies (lsim 4 Mpc), based on images in the F110W and F160W filters taken with the Wide-Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). The CMDs are measured in regions spanning a wide range of star formati…
On the Nature of the Solar Wind from Coronal Pseudostreamers
Sheeley, N. R., Jr.; Wang, Y. -M.; Robbrecht, E. +1 more
Coronal pseudostreamers, which separate like-polarity coronal holes, do not have current sheet extensions, unlike the familiar helmet streamers that separate opposite-polarity holes. Both types of streamers taper into narrow plasma sheets that are maintained by continual interchange reconnection with the adjacent open magnetic field lines. White-l…
The double sub-giant branch of NGC 6656 (M 22): a chemical characterization
Milone, A. P.; Marino, A. F.; Zoccali, M. +14 more
We present an abundance analysis of 101 subgiant branch (SGB) stars in the globular cluster M 22. Using low-resolution FLAMES/GIRAFFE spectra we have determined abundances of the neutron-capture strontium and barium and the light element carbon. With these data we explore relationships between the observed SGB photometric split in this cluster and…
Submillimeter Line Spectrum of the Seyfert Galaxy NGC 1068 from the Herschel-SPIRE Fourier Transform Spectrometer
Wilson, Christine D.; Bendo, George J.; Madden, Suzanne C. +13 more
The first complete submillimeter spectrum (190-670 µm) of the Seyfert 2 galaxy NGC 1068 has been observed with the SPIRE Fourier transform spectrometer on board the Herschel Space Observatory. The sequence of CO lines (J up = 4-13), lines from H2O, the fundamental rotational transition of hydrogen fluoride, two o-H…
Steep faint-end slopes of galaxy mass and luminosity functions at z≥ 6 and the implications for reionization
Jaacks, Jason; Choi, Jun-Hwan; Nagamine, Kentaro +2 more
We present the results of a numerical study comparing photometric and physical properties of simulated z= 6-9 galaxies to the observations taken by the Wide Field Camera 3 instrument aboard the Hubble Space Telescope. Using cosmological hydrodynamical simulations we find good agreement with observations in colour-colour space at all studied redshi…
A Monte Carlo Markov Chain Based Investigation of Black Hole Spin in the Active Galaxy NGC 3783
Fabian, Andrew C.; Brenneman, Laura W.; Reynolds, Christopher S. +4 more
The analysis of relativistically broadened X-ray spectral features from the inner accretion disk provides a powerful tool for measuring the spin of supermassive black holes in active galactic nuclei (AGNs). However, AGN spectra are often complex and careful analysis employing appropriate and self-consistent models is required if one has to obtain …
Overdensities of Y-dropout Galaxies from the Brightest-of-Reionizing Galaxies Survey: A Candidate Protocluster at Redshift z ≈ 8
Shull, J. M.; Treu, T.; Carollo, C. M. +8 more
Theoretical and numerical modeling of the assembly of dark-matter halos predicts that the most massive and luminous galaxies at high redshift are surrounded by overdensities of fainter companions. We test this prediction with Hubble Space Telescope observations acquired by our Brightest-of-Reionizing Galaxies (BoRG) survey, which identified four v…
The History and Environment of a Faded Quasar: Hubble Space Telescope Observations of Hanny's Voorwerp and IC 2497
Schawinski, Kevin; Keel, William C.; Thomas, Daniel +6 more
We present Hubble Space Telescope imaging and spectroscopy, along with supporting Galaxy Evolution Explorer and ground-based data, for the extended high-ionization cloud known as Hanny's Voorwerp, near the spiral galaxy IC 2497. Wide Field Camera 3 images show complex dust absorption near the nucleus of IC 2497. The galaxy core in these data is, w…
A Double Cluster at the Core of 30 Doradus
Panagia, N.; Anderson, J.; Lennon, D. J. +7 more
Based on an analysis of data obtained with the Wide Field Camera 3 on the Hubble Space Telescope we report the identification of two distinct stellar populations in the core of the giant H II region 30 Doradus in the Large Magellanic Cloud. The most compact and richest component coincides with the center of R136 and is ~1 Myr younger than a second…