A dataset provided by the European Space Agency

Name AZAV_HII
Title DUST DISTRIBUTION IN GALACTIC HII REGIONS
URL

http://nida.esac.esa.int/nida-sl-tap/data?RETRIEVAL_TYPE=OBSERVATION&PRODUCT_LEVEL=ALL&obsno=416024110
DOI https://doi.org/10.5270/esa-etnm5gq
Author ZAVAGNO, A
Description the aim of this proposal is to use isocam to study the distribution of unidentified infrared bands (uirbs) carriers in compact galactic hii regions. polycyclic aromatic hydrocarbon (pah) molecules are thought to be these carriers, responsible of a serie of bands observed in the infrared between 3 and 20 microns. the idea is to study the evolution of the carriers composition (size, dehydrogenation) and distribution (excitation/destruction) with the properties of the considered hii regions (spectral type of the exciting star, evolutionary stage). a previous work (zavagno et al., 1992) has shown that the emission in the 7.7, 8.6 and 11.3 micron bands can account for 50% of the 12 micron flux in compact hii regions. only few very bright hii regions (orion bar, bregman et al., 1989,, apj 344, 791 - geballe et al., 1989, apj 341, 278) have been observed from the ground. presently, it is not clear to know how that dust is exactly distributed in classical compact hii regions. can those molecules survive in the ionized medium and if so, how their spatial distribution looks like in it? how far is the extension of that dust component behind the ionization front? answer those questions requires the isocam sensitivity in uirb filters. such studies cannot be leaded from the ground due to the poor sensitivity of the available cameras in such filters. we have selected a sample of 8 compact visible hii regions for which the spectral type of the exciting star and the distance are known and for which visible and radio data are available in order to link the observed properties of these bands carriers to the physical properties of the ionized region.
Instrument CAM01 , CAM03
Temporal Coverage 1996-11-17T16:29:21Z/1998-01-06T03:03:01Z
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 1999-07-07T00:00:00Z
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, ZAVAGNO et al., 1999, 'DUST DISTRIBUTION IN GALACTIC HII REGIONS', 1.0, European Space Agency, https://doi.org/10.5270/esa-etnm5gq