A dataset provided by the European Space Agency

Name ENDDISK
Title HEATING AND METALLICITY IN THE EXTENDED HI DISKS AROUND NGC 891 AND NGC 6946
URL

http://nida.esac.esa.int/nida-sl-tap/data?RETRIEVAL_TYPE=OBSERVATION&PRODUCT_LEVEL=ALL&obsno=611004040
DOI https://doi.org/10.5270/esa-11da08l
Author TUFFS, RICHARD J
Description we propose to map the extended neutral disks of the nuclear starburst spiral ngc 6946 and the edge-on spiral ngc 891 at 175 and 200 microns. these extended hi disks extend about a factor of two beyond the optical disk. the observations will probe the dust content and ambient radiation field in the extended neutral disks. in the event that there is no ambient heating in the extended hi disks, any grains there will still be heated to ca 9 and 13 k by the inner disk luminosity of ngc 891 and ngc 6946, respectively. in this case, the pht-c detection limit at 200 microns is sufficient to detect grains with a dust-to-hi mass ratio of 0.1 at the outermost parts of the hi disk. the results may throw light on the evolutionary history of the extended hi disks, in particular whether they are predominently primordial in nature, or whether they result from a sporadic accretion of gas from interaction-accretion events over the age of the galaxy.
Instrument PHT32
Temporal Coverage 1997-05-12T16:56:03Z/1998-01-31T17:15:22Z
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 1999-04-08T00:00:00Z
Last Update 2026-07-09
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, TUFFS et al., 1999, 'HEATING AND METALLICITY IN THE EXTENDED HI DISKS AROUND NGC 891 AND NGC 6946', 1.0, European Space Agency, https://doi.org/10.5270/esa-11da08l
Rights Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.