Search Publications
The HERSCHEL Inventory of The Agents of Galaxy Evolution in the Magellanic Clouds, a Herschel Open Time Key Program
Poglitsch, A.; van Loon, J. Th.; Bernard, J. -P. +52 more
We present an overview of the HERschel Inventory of The Agents of Galaxy Evolution (HERITAGE) in the Magellanic Clouds project, which is a Herschel Space Observatory open time key program. We mapped the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC) at 100, 160, 250, 350, and 500 µm with the Spectral and Photometric Imaging Re…
The Influence of Dark Matter Halos on Dynamical Estimates of Black Hole Mass: 10 New Measurements for High-σ Early-type Galaxies
Saglia, R. P.; Nowak, N.; Thomas, J. +7 more
Adaptive optics assisted SINFONI observations of the central regions of 10 early-type galaxies are presented. Based primarily on the SINFONI kinematics, 10 black hole (BH) masses occupying the high-mass regime of the M BH-σ relation are derived using three-integral Schwarzschild models. The effect of dark matter (DM) inclusion on the BH…
Kronoseismology: Using Density Waves in Saturn's C Ring to Probe the Planet's Interior
Nicholson, P. D.; Hedman, M. M.
Saturn's C ring contains multiple spiral patterns that appear to be density waves driven by periodic gravitational perturbations. In other parts of Saturn's rings, such waves are generated by Lindblad resonances with Saturn's various moons, but most of the wave-like C-ring features are not situated near any strong resonance with any known moon. Us…
UVUDF: Ultraviolet Imaging of the Hubble Ultra Deep Field with Wide-Field Camera 3
Finkelstein, Steven L.; Ferguson, Henry C.; Giavalisco, Mauro +23 more
We present an overview of a 90 orbit Hubble Space Telescope treasury program to obtain near-ultraviolet imaging of the Hubble Ultra Deep Field using the Wide Field Camera 3 UVIS detector with the F225W, F275W, and F336W filters. This survey is designed to: (1) investigate the episode of peak star formation activity in galaxies at 1 < z < 2.5…
Depleted Galaxy Cores and Dynamical Black Hole Masses
Saglia, R. P.; Nowak, N.; Thomas, J. +4 more
Shallow cores in bright, massive galaxies are commonly thought to be the result of scouring of stars by mergers of binary supermassive black holes. Past investigations have suggested correlations between the central black hole mass and the stellar light or mass deficit in the core, using proxy measurements of M BH or stellar mass-to-lig…
An Exponential Decline at the Bright End of the z = 6 Galaxy Luminosity Function
Willott, Chris J.; Kneib, Jean-Paul; Ilbert, Olivier +7 more
We present the results of a search for the most luminous star-forming galaxies at redshifts z ≈ 6 based on Canada-France-Hawaii Telescope Legacy Survey data. We identify a sample of 40 Lyman break galaxies (LBGs) brighter than magnitude z' = 25.3 across an area of almost 4 deg2. Sensitive spectroscopic observations of seven galaxies pro…
Stellar Populations and Evolution of Early-type Cluster Galaxies: Constraints from Optical Imaging and Spectroscopy of z = 0.5-0.9 Galaxy Clusters
Jørgensen, Inger; Chiboucas, Kristin
We present an analysis of stellar populations and evolutionary history of galaxies in three similarly rich galaxy clusters MS0451.6-0305 (z = 0.54), RXJ0152.7-1357 (z = 0.83), and RXJ1226.9+3332 (z = 0.89). Our analysis is based on high signal-to-noise ground-based optical spectroscopy and Hubble Space Telescope imaging for a total of 17-34 member…
Hubble Tarantula Treasury Project: Unraveling Tarantula's Web. I. Observational Overview and First Results
Panagia, N.; Anderson, J.; Zaritsky, D. +18 more
The Hubble Tarantula Treasury Project (HTTP) is an ongoing panchromatic imaging survey of stellar populations in the Tarantula Nebula in the Large Magellanic Cloud that reaches into the sub-solar mass regime (<0.5 M ⊙). HTTP utilizes the capability of the Hubble Space Telescope to operate the Advanced Camera for Surveys and the Wide …
Space Velocities of Southern Globular Clusters. VII. NGC 6397, NGC 6626 (M28), and NGC 6656 (M22)
Casetti-Dinescu, Dana I.; Girard, Terrence M.; van Altena, William F. +3 more
We have measured the absolute proper motions of globular clusters NGC 6397, NGC 6626 (M22), and NGC 6656 (M28) as part of our ongoing Southern Proper-Motion Program. The reference system is the ICRS via Hipparcos stars for these three low-Galactic-latitude clusters. Formal errors range between ~0.3 and 0.7 mas yr-1. Notable is the resul…
The Star Formation History of the Very Metal-poor Blue Compact Dwarf I Zw 18 from HST/ACS Data
Cignoni, M.; Tosi, M.; Clementini, G. +7 more
We have derived the star formation history (SFH) of the blue compact dwarf galaxy I Zw 18 through comparison of deep HST/ACS data with synthetic color-magnitude diagrams (CMDs). A statistical analysis was implemented for the identification of the best-fit SFH and relative uncertainties. We confirm that I Zw 18 is not a truly young galaxy, having s…