Search Publications
Far-Infrared and Submillimeter Emission from Galactic and Extragalactic Photodissociation Regions
Wolfire, Mark G.; Kaufman, Michael J.; Hollenbach, David J. +1 more
Photodissociation region (PDR) models are computed over a wide range of physical conditions, from those appropriate to giant molecular clouds illuminated by the interstellar radiation field to the conditions experienced by circumstellar disks very close to hot massive stars. These models use the most up-to-date values of atomic and molecular data,…
15 Micron Infrared Space Observatory Observations of the 1415+52 Canada-France Redshift Survey Field: The Cosmic Star Formation Rate as Derived from Deep Ultraviolet, Optical, Mid-Infrared, and Radio Photometry
Omont, A.; Eales, S.; Thuan, T. X. +7 more
The Canada-France Redshift Survey 1452+52 field has been deeply imaged with the Infrared Space Observatory using ISOCAM through the LW3 filter (12-18 µm). Careful data analysis and comparison with deep optical and radio data have allowed us to generate a catalog of 78 15 µm sources with both radio and optical identifications. They are …
Observations of Solid Carbon Dioxide in Molecular Clouds with the Infrared Space Observatory
de Graauw, Th.; Prusti, T.; van Dishoeck, E. F. +8 more
Spectra of interstellar CO2 ice absorption features at a resolving power of λ/Δλ~1500-2000 are presented for 14 lines of sight. The observations were made with the Short-Wavelength Spectrometer (SWS) of the Infrared Space Observatory (ISO). Spectral coverage includes the primary stretching mode of CO2 near 4.27 µm in al…
Silicate Mineralogy of the Dust in the Inner Coma of Comet C/1995 01 (Hale-Bopp) Pre- and Postperihelion
Woodward, Charles E.; Koike, Chiyoe; Witteborn, Fred C. +4 more
We present 7.5-13.4 µm infrared (IR) spectrophotometry (R~=180-360) of the 10 µm silicate emission from dust in the inner coma (i.e., within a diameter of 3") of comet C/1995 O1 (Hale-Bopp) at four temporal epochs from 1996 October through 1997 June during Hale-Bopp's approach to, arrival at, and recession from perihelion. Hale-Bopp's …
Modeling W44 as a Supernova Remnant in a Density Gradient with a Partially Formed Dense Shell and Thermal Conduction in the Hot Interior. I. The Analytical Model
Smith, Randall K.; Shelton, R. L.; Maciejewski, Witold +4 more
We show that many observations of W44, a supernova remnant in the Galactic plane at a distance of about 2500 pc, are remarkably consistent with the simplest realistic model. The model remnant is evolving in a smooth ambient medium of fairly high density, about 6 cm-3 on average, with a substantial density gradient. At the observed time …
Mid-Infrared and Optical Spectroscopy of Ultraluminous Infrared Galaxies: A Comparison
Lutz, D.; Genzel, R.; Veilleux, S.
New tools from Infrared Space Observatory (ISO) mid-infrared spectroscopy have recently become available to determine the power sources of dust-obscured ultraluminous infrared galaxies (ULIRGs). We compare ISO classifications--starburst or active galactic nucleus (AGN)--with classifications from optical spectroscopy and with optical/near-infrared …
Discovery of an Extremely Young Accreting Protostar in Taurus
Motte, F.; André, P.; Bacmann, A.
We report the discovery of a new, very young accreting class 0 protostar in the southern part of the Taurus molecular cloud. This object, designated by IRAM 04191+1522, coincides with a cold (T~12 K) dust continuum condensation found at 1.3 mm with the IRAM 30 m telescope ~1' southwest of the class I infrared source IRAS 04191+1523. Although IRAM …
Dust in an Extremely Metal-Poor Galaxy: Mid-infrared Observations ofSBS 0335-052
Sauvage, Marc; Madden, Suzanne; Thuan, Trinh X.
The metal-deficient (Z=Zsolar/41) blue compact dwarf galaxy SBS 0335-052 was observed with ISOCAM between 5 and 17 µm. With an L12µm/LB ratio of 2.15, the galaxy is unexpectedly bright in the mid-infrared for such a low-metallicity object. The mid-infrared spectrum shows no sign of the unidentified infr…
ISO LWS Spectroscopy of M82: A Unified Evolutionary Model
Smith, Howard A.; Satyapal, Shobita; Spinoglio, Luigi +9 more
We present the first complete far-infrared spectrum (43-197 µm) of M82, the brightest infrared galaxy in the sky, taken with the Long Wavelength Spectrometer of the Infrared Space Observatory (ISO). We detected seven fine structure emission lines, [O I] 63 and 145 µm, [O III] 52 and 88 µm , [N II] 122 µm, [N III] 57 µ…
Newly Synthesized Elements and Pristine Dust in the Cassiopeia A Supernova Remnant
Dwek, E.; Arendt, R. G.; Moseley, S. H.
Spectroscopic observations at 2.4-45 µm of the young supernova remnant Cas A with the Infrared Space Observatory (ISO) Short Wavelength Spectrometer reveal strong emission lines of O, Ne, Si, S, and Ar. These lines are observed at high velocities (several 103 km s-1) and are therefore associated with the supernova eject…