Search Publications
Do the Infrared Emission Features Need Ultraviolet Excitation? The Polycyclic Aromatic Hydrocarbon Model in UV-poor Reflection Nebulae
Draine, B. T.; Li, Aigen
One of the major challenges to identification of the 3.3, 6.2, 7.7, 8.6, and 11.3 µm interstellar infrared (IR) emission bands with polycyclic aromatic hydrocarbon (PAH) molecules has been the recent detection of these bands in regions with little ultraviolet (UV) illumination, since small, neutral PAH molecules have little or no absorption …
Cold Dust in Late-Type Virgo Cluster Galaxies
Madore, Barry F.; Tuffs, Richard J.; Popescu, Cristina C. +2 more
We have statistically analyzed the spatially integrated far-infrared (FIR) emissions of the complete volume- and luminosity-limited sample of late-type (later than S0) Virgo Cluster galaxies measured using the Infrared Space Observatory by Tuffs and coworkers in bands centered on 60, 100, and 170 µm. Thirty of 38 galaxies detected at all thr…
The Excitation and Metallicity of Galactic H II Regions from Infrared Space Observatory SWS Observations of Mid-Infrared Fine-Structure Lines
Pauldrach, A. W. A.; Feuchtgruber, Helmut; Lutz, Dieter +2 more
We present mid-infrared Infrared Space Observatory Short-Wavelength Spectrometer (ISO-SWS) observations of the fine-structure emissions lines [Ne II] 12.8 µm, [Ne III] 15.6 µm, [Ne III] 36.0 µm, [Ar II] 6.99 µm, [Ar III] 8.99 µm, [S III] 18.7 µm, [S III] 33.5 µm, and [S IV] 10.5 µm and the recombinat…
Mid-Infrared Observation of Mass Loss in Elliptical Galaxies
Sauvage, Marc; Temi, Pasquale; Bregman, Jesse +2 more
Early-type galaxies exhibit thermal and molecular resonance emission from dust that is shed and heated through stellar mass loss as a subset of the population moves through the asymptotic giant branch (AGB) phase of evolution. Because this emission can give direct insight into stellar evolution in addition to galactic stellar mass loss and interst…
Infrared Emission from Interstellar Dust. III. The Small Magellanic Cloud
Draine, B. T.; Li, Aigen
The infrared emission from interstellar dust in the Small Magellanic Cloud is modeled using a mixture of amorphous silicate and carbonaceous grains, including a population of polycyclic aromatic hydrocarbon (PAH) molecules. We show the following: (1) This dust model is able to reproduce the spectral energy distribution from near-IR to far-IR for t…
Chandra Study of Young Stellar Objects in the NGC 1333 Star-forming Cloud
Lada, Charles J.; Bally, John; Feigelson, Eric D. +3 more
NGC 1333, a highly active star formation region within the Perseus molecular cloud complex, has been observed with the ACIS-I detector on board the Chandra X-Ray Observatory. In our image with a sensitivity limit of ~1028 ergs s-1, we detect 127 X-ray sources, most with subarcsecond positional accuracy. While 32 of these sour…
ISOCAM Observations of Galactic Globular Clusters: Mass Loss along the Red Giant Branch
Ferraro, Francesco R.; Origlia, Livia; Fusi Pecci, Flavio +1 more
Deep images in the 10 µm spectral region have been obtained for five massive Galactic globular clusters, NGC 104 (=47 Tuc), NGC 362, NGC 5139 (=ω Cen), NGC 6388, NGC 7078 (=M15), and NGC 6715 (=M54) in the Sagittarius Dwarf Spheroidal using the ISOCAM on board the Infrared Space Observatory in 1997. A significant sample of bright giants have…
Evolution in the Far-Infrared Spectra of Low-Mass Young Embedded Sources
Giannini, Teresa; Nisini, Brunella; Lorenzetti, Dario
The far-infrared spectra (45-197 µm) of 28 low-luminosity young embedded objects have been studied in order to search for possible evolutive trends in the observed spectral features. The low-resolution spectra from 45 to 197 µm of 17 Class 0 and 11 Class I sources taken with the Long Wavelength Spectrometer (LWS) on board the Infrared …
Optically Faint Counterparts to the Infrared Space Observatory FIRBACK 170 Micron Population: Discovery of Cold, Luminous Galaxies at High Redshift
Smail, I.; Ivison, R. J.; Helou, G. +3 more
We present Keck spectroscopy and UKIRT near-IR imaging observations of two 170 µm-selected sources from the Infrared Space Observatory (ISO) FIRBACK survey that have faint counterparts in the optical and r-K~5. Both sources were expected to lie at z>1, based on their far-infrared, submillimeter, and radio fluxes, assuming a spectral energ…
The Far-Infrared Energy Distributions of Seyfert and Starburst Galaxies in the Local Universe: Infrared Space Observatory Photometry of the 12 Micron Active Galaxy Sample
Spinoglio, Luigi; Malkan, Matthew A.; Andreani, Paola
New far-infrared photometry with ISOPHOT aboard the Infrared Space Observatory (ISO) is presented for 58 galaxies with homogeneous published data for another 32 galaxies, all belonging to the 12 µm galaxy sample-in total, 29 Seyfert 1 galaxies, 35 Seyfert 2 galaxies, and 12 starburst galaxies, or about half of the 12 µm active galaxy s…