| Name | PDR_PHYS |
| Title | PHYSICAL CONDITIONS IN PHOTODISSOCIATION REGIONS |
| URL | |
| DOI | https://doi.org/10.5270/esa-lpwps3b |
| Author | BERTOLDI, FRANK |
| Description | in order to study the physical conditions in low-excitation photodissociation regions we propose a detailed spectroscopic study of two bright h2 emission knots in the prototypical reflection nebula ngc 2023. a first analysis of our sws observations of the s140 pdr (timmermann et al. 1996, attached) motivates us to also request followup observations of s140 to clarify questions raised regarding the gas temperature, the ortho-para ratio, and the iron abundance. to comparatively study pdrs from significantly harder radiation fields and the effects of rapidly propagating ionization fronts on the pdr structure we propose to observe several molecular clumps illuminated by early type o stars. for this we selected targets in the w5 and rosette hii regions. |
| Instrument | LWS01 , SWS02 |
| Temporal Coverage | 1997-08-09T11:10:33Z/1997-08-17T12:17:48Z |
| Version | 1.0 |
| Mission Description | The Infrared Space Observatory (ISO) was the worlds first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths. |
| Creator Contact | https://support.cosmos.esa.int/iso/ |
| Date Published | 1999-03-25T00:00:00Z |
| Last Update | 2026-03-02 |
| Keywords | Infrared Space Observatory data, ESA ISO mission dataset, ISO infrared observations, mid-infrared astronomy data, far-infrared spectroscopy dataset, ISOCAM imaging data, ISOPHOT photometry data, SWS short wavelength spectrometer data, LWS long wavelength spectrometer data, infrared spectral line observations, infrared imaging survey data, dust emission infrared observations, star formation infrared dataset, interstellar medium spectroscopy data, polycyclic aromatic hydrocarbons PAH features data, active galactic nuclei infrared observations, circumstellar envelope infrared data, planetary nebula infrared spectroscopy, extragalactic infrared survey data, calibrated ISO data products, FITS files infrared astronomy, spectral energy distribution infrared data, continuum photometry dataset, infrared spectral cubes, flux-calibrated infrared maps, ESA ISO Data Archive, legacy infrared space mission dataset |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, BERTOLDI et al., 1999, 'PHYSICAL CONDITIONS IN PHOTODISSOCIATION REGIONS', 1.0, European Space Agency, https://doi.org/10.5270/esa-lpwps3b |