Search Publications
The [C II] 158 Micron Line Deficit in Ultraluminous Infrared Galaxies Revisited
Lutz, D.; Genzel, R.; Sturm, E. +5 more
We present a study of the [C II] 157.74 µm fine-structure line in a sample of 15 ultraluminous infrared (IR) galaxies (IR luminosity LIR>=1012Lsolar ULIRGs) using the Long Wavelength Spectrometer (LWS) on the Infrared Space Observatory (ISO). We confirm the observed order of magnitude deficit (compared to …
Infrared Emission of Normal Galaxies from 2.5 to 12 Micron: Infrared Space Observatory Spectra, Near-Infrared Continuum, and Mid-Infrared Emission Features
Beichman, Charles A.; Dale, Daniel A.; Dinerstein, Harriet L. +6 more
We present ISOPHOT spectra of the regions 2.5-4.9 µm and 5.8-11.6 µm for a sample of 45 disk galaxies from the US Infrared Space Observatory Key Project on Normal Galaxies. The galaxies were selected to span the range in global properties of normal, star-forming disk galaxies in the local universe. The spectra can be decomposed into th…
The Canada-UK Deep Submillimeter Survey. VI. The 3 Hour Field
Ivison, R. J.; Clements, D. L.; Dunne, L. +6 more
We present the complete submillimeter data for the Canada-UK Deep Submillimeter Survey (CUDSS) 3h field. The observations were taken with the Submillimeter Common-User Bolometric Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT) on Mauna Kea. The 3h field is one of two main fields in our survey and covers 60 arcmin
CO (J=7-->6) Observations of NGC 253: Cosmic-Ray-heated Warm Molecular Gas
Bolatto, A. D.; Stacey, G. J.; Bradford, C. M. +5 more
We report observations of the CO J=7-->6 transition toward the starburst nucleus of NGC 253. This is the highest excitation CO measurement in this source to date and allows an estimate of the molecular gas excitation conditions. Comparison of the CO line intensities with a large velocity gradient, escape probability model indicates that the bul…
A Multitransition CO Study of the Antennae Galaxies NGC 4038/9
Kuno, Nario; Zhu, Ming; Seaquist, E. R.
For the Antennae interacting galaxy pair, we have obtained high-quality, fully sampled 12CO J=1-0 and 3-2 maps of the regions surrounding the nuclei and the area of overlap between the two galaxies. The maps possess an angular resolution of 15" or 1.5 kpc, so far the highest resolution maps available at both the J=1-0 and 3-2 transition…
Age Dependence of the Vega Phenomenon: Observations
Waters, L. B. F. M.; Dominik, C.; Waelkens, C. +1 more
We study the time dependency of Vega-like excesses using infrared studies obtained with the imaging photopolarimeter ISOPHOT on board the Infrared Space Observatory. We review the different studies published on this issue and critically check and revise ages and fractional luminosities in the different samples. The conclusions of our study differ …
Guilt by Association: The 13 Micron Dust Emission Feature and Its Correlation to Other Gas and Dust Features
Sloan, G. C.; Kraemer, Kathleen E.; Price, Stephan D. +1 more
A study of all full-scan spectra of optically thin oxygen-rich circumstellar dust shells in the database produced by the Short Wavelength Spectrometer on ISO reveals that the strength of several infrared spectral features correlates with the strength of the 13 µm dust feature. These correlated features include dust features at 19.8 and 28.1 …
Nascent Starbursts in Synchrotron-deficient Galaxies with Hot Dust
Helou, G.; Roussel, H.; Beck, R. +4 more
Three nearby galaxies that have abnormally high infrared-to-radio continuum ratios, NGC 1377, IC 1953, and NGC 4491, are investigated with a view to understanding the physical origin of their peculiarity. We review the existing data and present new radio continuum measurements along with near-infrared integral-field spectroscopy and molecular gas …
Physical Conditions and Star Formation Activity in the Intragroup Medium of Stephan's Quintet
Lu, N.; Xu, C. K.; Tuffs, R. J. +2 more
New multiband observations of the famous compact group of galaxies Stephan's Quintet (SQ) are presented and analyzed. These include far-infrared (FIR) images at 60 and 100 µm (ISOPHOT C100 camera), radio continuum images at 1.4 GHz (VLA B configuration) and 4.86 GHz (VLA C configuration), and long-slit optical spectrographs (Palomar 200" tel…
A Comprehensive Study of the L1551 IRS 5 Binary System
Hartmann, Lee; Calvet, Nuria; Muzerolle, James +2 more
We model the Class I source L1551 IRS 5, adopting a flattened infalling envelope surrounding a binary disk system and a circumbinary disk. With our composite model, we calculate self-consistently the spectral energy distribution of each component of the L1551 IRS 5 system, using additional constraints from recent observations by ISO, the water ice…