Search Publications
Interstellar Ice: The Infrared Space Observatory Legacy
Whittet, D. C. B.; Tielens, A. G. G. M.; Boogert, A. C. A. +1 more
We present 2.5-30 µm spectra from the Short-Wavelength Spectrometer of the Infrared Space Observatory for a total of 23 sources. The sources include embedded young stellar objects spanning a wide range of mass and luminosity, together with field stars sampling quiescent dark clouds and the diffuse interstellar medium. Expanding on results of…
GEMS: Galaxy Evolution from Morphologies and SEDs
Bell, Eric F.; Somerville, Rachel S.; Wisotzki, Lutz +13 more
GEMS (Galaxy Evolution from Morphologies and SEDs) is a large-area (800 arcmin2) two-color (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on the Hubble Space Telescope. Centered on the Chandra Deep Field-South, it covers an area of ~28'×28', or about 120 Hubble Deep Field areas, to a depth o…
The 24 Micron Source Counts in Deep Spitzer Space Telescope Surveys
Rigby, J. R.; Le Floc'h, E.; Dole, H. +20 more
Galaxy source counts in the infrared provide strong constraints on the evolution of the bolometric energy output from distant galaxy populations. We present the results from deep 24 µm imaging from Spitzer surveys, which include ~5×104 sources to an 80% completeness of ~=60 µJy. The 24 µm counts rapidly rise at near-Eu…
Photoionization Modeling and the K Lines of Iron
Kallman, T. R.; Krolik, J. H.; Bautista, M. A. +2 more
We calculate the efficiency of iron K line emission and iron K absorption in photoionized models using a new set of atomic data. These data are more comprehensive than those previously applied to the modeling of iron K lines from photoionized gases and allow us to systematically examine the behavior of the properties of line emission and absorptio…
The ACS Virgo Cluster Survey. I. Introduction to the Survey
Jordán, Andrés; Tonry, John L.; Côté, Patrick +7 more
The Virgo Cluster is the dominant mass concentration in the Local Supercluster and the largest collection of elliptical and lenticular galaxies in the nearby universe. In this paper, we present an introduction to the ACS Virgo Cluster Survey: a program to image, in the F475W and F850LP bandpasses (~Sloan g and z), 100 early-type galaxies in the Vi…
The Anatomy of Star Formation in NGC 300
Helou, G.; Roussel, H.; Fazio, G. G. +19 more
The Spitzer Space Telescope was used to study the mid- to far-infrared properties of NGC 300 and to compare dust emission to Hα to elucidate the heating of the interstellar medium (ISM) and the star formation cycle at scales smaller than 100 pc. The new data allow us to discern clear differences in the spatial distribution of 8 µm dust emiss…
An Extended Scheme for Fitting X-Ray Data with Accretion Disk Spectra in the Strong Gravity Regime
Yaqoob, T.; Dovčiak, M.; Karas, V.
Accreting black holes are believed to emit X-rays, which then mediate information about strong gravity in the vicinity of the emission region. We report on a set of new routines for the XSPEC package for analyzing X-ray spectra of black-hole accretion disks. The new computational tool significantly extends the capabilities of the currently availab…
Polycyclic Aromatic Hydrocarbon Contribution to the Infrared Output Energy of the Universe at z ~= 2
Le Floc'h, E.; Dole, H.; Lagache, G. +10 more
We present an updated phenomenological galaxy evolution model to fit the Spitzer 24, 70, and 160 µm number counts, as well as all the previous mid- and far-infrared observations. Only a minor change of the comoving luminosity density distribution in the previous model (Lagache, Dole, & Puget), combined with a slight modification of the s…
A Galactic O Star Catalog
Walborn, Nolan R.; Maíz-Apellániz, Jesús; Galué, Héctor Á. +1 more
We have produced a catalog of 378 Galactic O stars with accurate spectral classifications that is complete for V<8 but includes many fainter stars. The catalog provides cross-identifications with other sources; coordinates (obtained in most cases from Tycho-2 data); astrometric distances for 24 of the nearest stars; optical (Tycho-2, Johnson, a…
Faint Galaxies in Deep Advanced Camera for Surveys Observations
Infante, L.; Zheng, W.; Feldman, P. D. +33 more
We present the analysis of the faint galaxy population in the Advanced Camera for Surveys (ACS) Early Release Observation fields VV 29 (UGC 10214) and NGC 4676. These observations cover a total area of 26.3 arcmin2 and have depths close to that of the Hubble Deep Fields in the deepest part of the VV 29 image, with 10 σ detection limits …