Search Publications
The Next Generation Virgo Cluster Survey (NGVS). I. Introduction to the Survey
Sawicki, Marcin; Jordán, Andrés; Wilson, Christine D. +49 more
The Next Generation Virgo Cluster Survey (NGVS) is a program that uses the 1 deg2 MegaCam instrument on the Canada-France-Hawaii Telescope to carry out a comprehensive optical imaging survey of the Virgo cluster, from its core to its virial radius—covering a total area of 104 deg2—in the u*griz bandpasses. Thanks to a dedicat…
The Panchromatic Hubble Andromeda Treasury
Bell, Eric F.; Skillman, Evan D.; Williams, Benjamin F. +30 more
The Panchromatic Hubble Andromeda Treasury is an ongoing Hubble Space Telescope Multi-Cycle Treasury program to image ~1/3 of M31's star-forming disk in six filters, spanning from the ultraviolet (UV) to the near-infrared (NIR). We use the Wide Field Camera 3 (WFC3) and Advanced Camera for Surveys (ACS) to resolve the galaxy into millions of indiv…
A Catalog of 132,684 Clusters of Galaxies Identified from Sloan Digital Sky Survey III
Han, J. L.; Wen, Z. L.; Liu, F. S.
Using the photometric redshifts of galaxies from the Sloan Digital Sky Survey III (SDSS-III), we identify 132,684 clusters in the redshift range of 0.05 <= z < 0.8. Monte Carlo simulations show that the false detection rate is less than 6% for the whole sample. The completeness is more than 95% for clusters with a mass of M 200 &g…
A Revised Parallel-sequence Morphological Classification of Galaxies: Structure and Formation of S0 and Spheroidal Galaxies
Kormendy, John; Bender, Ralf
We update van den Bergh's parallel-sequence galaxy classification in which S0 galaxies form a sequence S0a-S0b-S0c that parallels the sequence Sa-Sb-Sc of spiral galaxies. The ratio B/T of bulge-to-total light defines the position of a galaxy in this tuning-fork diagram. Our classification makes one major improvement. We extend the S0a-S0b-S0c seq…
The Chandra COSMOS Survey. III. Optical and Infrared Identification of X-Ray Point Sources
Salvato, M.; Fiore, F.; Vignali, C. +29 more
The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, Chandra program that has imaged the central 0.9 deg2 of the COSMOS field down to limiting depths of 1.9 × 10-16 erg cm-2 s-1 in the soft (0.5-2 keV) band, 7.3 × 10-16 erg cm-2 s-1 in the hard (2-10 keV) band, and 5.…
Collisional Excitation of the [C II] Fine Structure Transition in Interstellar Clouds
Velusamy, T.; Goldsmith, Paul F.; Pineda, Jorge L. +1 more
We analyze the collisional excitation of the 158 µm (1900.5 GHz) fine structure transition of ionized carbon in terms of line intensities produced by simple cloud models. The single C+ fine structure transition is a very important coolant of the atomic interstellar medium (ISM) and of photon-dominated regions in which carbon is pa…
Neutral Interstellar Helium Parameters Based on IBEX-Lo Observations and Test Particle Calculations
Bochsler, P.; McComas, D. J.; Fuselier, S. A. +10 more
Because of its high ionization potential and weak interaction with hydrogen, neutral interstellar helium (NISHe) is almost unaffected at the heliospheric interface with the interstellar medium and freely enters the solar system. This second most abundant species provides some of the best information on the characteristics of the interstellar gas i…
Spectral Energy Distributions of Local Luminous and Ultraluminous Infrared Galaxies
Sanders, D. B.; Frayer, D. T.; Kartaltepe, J. S. +19 more
Luminous (LIRGs; log (L IR/L ⊙) = 11.00-11.99) and ultraluminous infrared galaxies (ULIRGs; log (L IR/L ⊙) = 12.00-12.99) are the most extreme star-forming galaxies in the universe. The local (U)LIRGs provide a unique opportunity to study their multi-wavelength properties in detail for comparison with th…
The ACS Fornax Cluster Survey. VI. The Nuclei of Early-type Galaxies in the Fornax Cluster
Jordán, Andrés; Côté, Patrick; Peng, Eric W. +5 more
The Advanced Camera for Surveys (ACS) Fornax Cluster Survey is a Hubble Space Telescope program to image 43 early-type galaxies in the Fornax cluster, using the F475W and F850LP bandpasses of the ACS. We employ both one-dimensional and two-dimensional techniques to characterize the properties of the stellar nuclei in these galaxies, defined as the…
New Hubble Space Telescope Observations of Heavy Elements in Four Metal-Poor Stars
Beers, Timothy C.; Roederer, Ian U.; Frebel, Anna +7 more
Elements heavier than the iron group are found in nearly all halo stars. A substantial number of these elements, key to understanding neutron-capture nucleosynthesis mechanisms, can only be detected in the near-ultraviolet. We report the results of an observing campaign using the Space Telescope Imaging Spectrograph on board the Hubble Space Teles…