| Name | SHELLS |
| Title | DUST IN SHELL GALAXIES |
| URL | |
| DOI | https://doi.org/10.5270/esa-1oug3ba |
| Author | van der Hulst, J.M. |
| Description | we propose to observe the outer regions of 3 elliptical/s0 galaxies with optical/hi shells in the fir with isophot in order find evidence for the presence of cool dust in the shells. a large fraction of elliptical and early type galaxies exhibit shells, possibly caused by interactions/merging with gas rich companions. we have found hi associated with the faint optical shells in 4 systems, the most prominent examples being centaurus a and ngc 2865. the kinematics of the hi cast doubt on several of the existing scenarios involving both internal and external origins for the outer shells. the external scenarios appear to have the most promise at the moment. the external scenarios describe infall of a companion object into the parent galaxy. this could be either a gas rich companion galaxy or primordial gas clouds. a way to discriminate between these possibilities is to search for the presence of dust in these outer regions where we found the hi. pointed observations with isophot at 135 and 200 micron will go a factor 10 deeper than the existing iras data where these shells have not been detected at a level of about 1 mjy/ster. these observations will not only provide clues about the presence of dust, but in the case of detection of emission also provide a measure of the fir energy distribution and hence the temperature of the dust, which we expect to be low. |
| Instrument | PHT22 |
| Temporal Coverage | 1996-08-22T23:37:50Z/1996-12-30T00:34:46Z |
| 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, van der Hulst et al., 1999, 'DUST IN SHELL GALAXIES', 1.0, European Space Agency, https://doi.org/10.5270/esa-1oug3ba |