Search Publications
Cosmicflows-2: The Data
Dolphin, Andrew E.; Wu, Po-Feng; Shaya, Edward J. +11 more
Cosmicflows-2 is a compilation of distances and peculiar velocities for over 8000 galaxies. Numerically the largest contributions come from the luminosity-line width correlation for spirals, the Tully-Fisher relation (TFR), and the related fundamental plane relation for E/S0 systems, but over 1000 distances are contributed by methods that provide …
Confirmation of Faint Dwarf Galaxies in the M81 Group
Chiboucas, Kristin; Tully, R. Brent; Karachentsev, Igor D. +1 more
We have followed up on the results of a 65 deg2 CFHT/MegaCam imaging survey of the nearby M81 Group searching for faint and ultra-faint dwarf galaxies. The original survey turned up 22 faint candidate dwarf members. Based on two-color HST ACS/WFC and WFPC2 photometry, we now confirm 14 of these as dwarf galaxy members of the group. Dist…
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…
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 …
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…
Binary Cepheids: Separations and Mass Ratios in 5 M ⊙ Binaries
Schaefer, Gail H.; Bond, Howard E.; Karovska, Margarita +3 more
Deriving the distribution of binary parameters for a particular class of stars over the full range of orbital separations usually requires the combination of results from many different observing techniques (radial velocities, interferometry, astrometry, photometry, direct imaging), each with selection biases. However, Cepheids—cool, evolved stars…