scholarly journals AGN Spectra as Seen by the Infrared Space Observatory: First Results

1997 ◽  
Vol 159 ◽  
pp. 333-336
Author(s):  
D. Lutz ◽  
R. Genzel ◽  
E. Sturm ◽  
A.F.M. Moorwood ◽  
E. Oliva ◽  
...  
Keyword(s):  
Fine Structure ◽  
Short Wavelength ◽  
Molecular Hydrogen ◽  
Molecular Gas ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
First Results ◽  
External Galaxies ◽  
First Time ◽  
Fine Structure Lines

AbstractWe discuss 2.5–45 µm spectra of the Circinus galaxy and of Cen A, obtained with the Short Wavelength Spectrometer (SWS) on board the Infrared Space Observatory. The large number of detected ionic fine structure lines, observable also in visually obscured sources, provides strong constraints on the shape of the ionizing spectrum, which is found to exhibit a UV bump peaking at ~ 70 eV in the case of Circinus. Pure rotational emission of molecular hydrogen, directly probing warm molecular gas, can for the first time be detected in external galaxies.

scholarly journals First Results and Discoveries with the ISO Short-Wavelength Spectrometer

1998 ◽  
Vol 11 (2) ◽  
pp. 1113-1115
Author(s):  
Thijs De Graauw
Keyword(s):  
Spectral Resolution ◽  
Short Wavelength ◽  
Wave Length ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
Length Range ◽  
First Results ◽  
Scientific Results

AbstractThe Short-Wavelength Spectrometer(SWS) is one of the four instruments on-board of ESA’s Infrared Space Observatory(ISO), launched on 15 Nov. 1995. It covers the wave-length range of 2.38-45.2μm with a spectral resolution ranging from 1000-2000. An overview is given of the in-orbit performance and a summary of the main scientific results and discoveries obtained in the first 18 months of operation of the ISO-SWS.

scholarly journals ISO spectroscopy of nearby starburst galaxies

1999 ◽  
Vol 193 ◽  
pp. 745-746 ◽  
Author(s):  
Dietmar Kunze ◽  
Dieter Lutz ◽  
Dimitra Rigopoulou ◽  
Michelle D. Thornley ◽  
Reinhard Genzel
Keyword(s):  
Wavelength Range ◽  
Short Wavelength ◽  
Molecular Hydrogen ◽  
Starburst Galaxies ◽  
Line Ratio ◽  
Emission Lines ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
Atomic Species

We present spectroscopic mid-IR observations of prominent starburst galaxies obtained with the Short Wavelength Spectrometer onboard the Infrared Space Observatory. The wavelength range accessible by ISO-SWS (2.5–45 μm) contains a large number of emission lines of atomic and molecular hydrogen and several other atomic species. In this paper we discuss the interpretation of the [Ne III] 15.5 μm/[Ne II] 12.8 μm line-ratio, the faint [OIV]25.9 μm line and the pure rotational lines of molecular hydrogen observed in our target galaxies.

scholarly journals Infrared spectroscopy with the Infrared Space Observatory

1997 ◽  
Vol 178 ◽  
pp. 373-384
Author(s):  
R. Genzel ◽  
S. Drapatz ◽  
D. Lutz ◽  
C. Wright ◽  
Th. De Graauw
Keyword(s):  
Infrared Spectroscopy ◽  
Short Wavelength ◽  
Emission Lines ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
Molecular Emission ◽  
First Results

The Infrared Space Observatory (ISO) is opening the 2.5 to 200 μm band for detailed infrared spectroscopy. Concentrating on ionic and molecular emission lines observed with the Short Wavelength Spectrometer (SWS) we discuss ISO's first results on Galactic and extragalactic sources.

scholarly journals The neon abundance in WC stars. II. ISO-SWS spectroscopy of WR 90 (HD 156385)

1999 ◽  
Vol 193 ◽  
pp. 233-234
Author(s):  
Luc Dessart ◽  
Allan J. Willis ◽  
Paul A. Crowther ◽  
Patrick W. Morris ◽  
D. John Hillier
Keyword(s):  
Fine Structure ◽  
Stellar Evolution ◽  
Reasonable Agreement ◽  
Massive Stars ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
Major Discrepancy ◽  
Fine Structure Lines

In general, observationally derived wind compositions of WR stars are in reasonable agreement with predictions from stellar evolution models for massive stars. However, Barlow et al. (1988) identified a major discrepancy for neon in γ2 Vel (WC8+O) using ground-based observations. The advent of the ESA Infrared Space Observatory (ISO) has allowed the study of neon in many more WC stars, using mid-IR fine structure lines ([Ne II] 12.81 μm, [NeIII] 15.55μm and [NEV] 14.32 μm). Willis et al. (1998) used ISO-SWS observations of WR 146 (WC5+O) to derive a neon abundance that was within the range expected theoretically. Here we undertake a study of WR 90 (HD 156385), the only (apparently) single WC7 star in our Galaxy, using ISO-SWS spectroscopy. The only spectroscopic neon feature in the mid-IR of WR 90 is [Ne III] 15.55 μm, in addition to numerous C IV and He II transitions (see Figure 1).

scholarly journals Observations of Molecular Hydrogen in Shocks and PDRs with the Infrared Space Observatory

2000 ◽  
Vol 197 ◽  
pp. 177-190
Author(s):  
Christopher M. Wright
Keyword(s):  
Molecular Hydrogen ◽  
Gas Temperature ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
X Ray ◽  
Ss 433 ◽  
Isotopic Species ◽  
Galactic Source ◽  
First Time ◽  
Excitation Conditions

A review is presented of ISO observations of molecular hydrogen and its isotopic species, HD, toward various Galactic source types, such as shocks (Orion, DR 21, Cep A), photon dominated regions (IC 1396A, S140, Orion Bar) and putative X-ray excited sources (RCW 103, SS 433). In so doing I examine the similarities and differences in the H2 spectrum found under these different excitation conditions and mechanisms, and how the observations impact on some of the latest shock and PDR models. For instance, in addition to the ubiquitous ~ 2000 K component in shocks, seen using ground-based instrumentation, ISO reveals the existence of gas with both lower (150–800 K) and higher (≥ 3000 K) excitation temperatures. Further, ISO allows for the first time a measure of the bulk gas temperature toward PDRs (100–700 K), and H2 is also detected where X-ray emission is observed, providing at least circumstantial evidence of X-ray heating.

scholarly journals Luminous Infrared Galaxies in a Merging Sequence: ISO Observations

1999 ◽  
Vol 186 ◽  
pp. 282-282 ◽  
Author(s):  
C.-Y. Hwang ◽  
K.Y. Lo ◽  
Y. Gao ◽  
R.A. Gruendl ◽  
N.-Y. Lu
Keyword(s):  
High Spatial Resolution ◽  
Molecular Gas ◽  
Infrared Images ◽  
Infrared Galaxies ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
Mid Infrared ◽  
Luminous Infrared Galaxies ◽  
Physical Conditions ◽  
Galaxy Interaction

We report mid-infrared images of several luminous infrared galaxies (LIGs) taken with ISOCAM on the Infrared Space Observatory (ISO). These LIGs were chosen to represent different phases of a merger sequence of galaxy-galaxy interaction with special emphasis on early/intermediate stages of merging. The molecular gas distribution of these LIGs has also been mapped at high spatial resolution (see contribution by Gao et al., this volume). The goal is to do a synoptic study of the evolution of physical conditions in these LIGs along the merger sequence.

scholarly journals 30 Doradus as a Nearby Infrared Guide to Starbursts

1999 ◽  
Vol 190 ◽  
pp. 247-248 ◽  
Author(s):  
M. D. Thornley ◽  
N.M. Förster Schreiber ◽  
H.W.W. Spoon ◽  
R. Genzel ◽  
D. Lutz ◽  
...  
Keyword(s):  
Fine Structure ◽  
Short Wavelength ◽  
Massive Stars ◽  
Stellar Populations ◽  
Starburst Galaxies ◽  
Fine Structure Lines ◽  
30 Doradus

We are exploring the properties of obscured starburst galaxies, using observations of atomic fine structure lines taken with the Short Wavelength Spectrometer aboard ISO. However, it is important to ascertain how well our starburst models can recover the properties of the stellar populations in more distant starbursts. For this purpose, we use observations of a nebular “shell” in the 30 Doradus region, to show that our models reliably predict the presence of the very massive stars observed directly in the 30 Doradus region.

scholarly journals Highlights From ISO: The Isocam Camera

1998 ◽  
Vol 11 (2) ◽  
pp. 1110-1112 ◽  
Author(s):  
Catherine J. Cesarsky
Keyword(s):  
Star Formation ◽  
Interstellar Dust ◽  
Young Stars ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
Dark Clouds ◽  
External Galaxies ◽  
One Year ◽  
The Universe

AbstractOver one year and a half after its first light in orbit, the ISOCAM camera on board the Infrared Space Observatory is bringing back very exciting results. Its spectacular infrared viewing of the Universe sheds new light on the nature of the interstellar dust, on the birth of young stars embedded in dark clouds as well as on bursts of star formation in external galaxies.

scholarly journals The Nature of Ultraluminous Infrared Galaxies

2001 ◽  
Vol 204 ◽  
pp. 179-191
Author(s):  
Eckhard Sturm
Keyword(s):  
Far Infrared ◽  
Spectroscopic Studies ◽  
Infrared Galaxies ◽  
Space Observatory ◽  
Infrared Space Observatory ◽  
Infrared Spectroscopic ◽  
Ultraluminous Infrared Galaxies ◽  
First Time

The Infrared Space Observatory (ISO) has for the first time made possible mid- and far-infrared spectroscopic studies of nearby and moderate redshift, dusty ultraluminous infrared galaxies (ULIRGs). We discuss recent SWS, LWS, ISOPHOT-S and ISOCAM (CVF) results on ULIRGs, addressing the following topics: What powers ULIRGs? What is the AGN-starburst connection? How do ULIRGs evolve? What is the connection of the local ULIRG population to the recently discovered population of mid-IR to submillimeter sources?

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