A dataset provided by the European Space Agency

Name QSO_EVOL
Title THE PHYSICAL CAUSES OF QUASAR EVOLUTION
URL

http://nida.esac.esa.int/nida-sl-tap/data?RETRIEVAL_TYPE=OBSERVATION&PRODUCT_LEVEL=ALL&obsno=247008180
DOI https://doi.org/10.5270/esa-n9crw1a
Author GOLDSCHMIDT, PIPPA
Description at optical wavelengths we know that quasars evolve such that at a given luminosity the space density increases as redshift increases up to a redshift of 2-3, but we do not know whether this change is due to density or luminosity evolution. we intend to do photometry on a sample of bright quasars at a variety of wavelengths, at 7.3, 11.5, 25, 60, and 100 microns. with these data we will determine the spectral energy distributions. this sample of quasars has been carefully constructed such that it spans a wide range in redshift and a narrow range in optical luminosity, in order to eliminate the usual luminosity-redshift degeneracy inherent in most quasar samples. with this sample of quasars we will be able to see if the ir s.e.d.s of the quasars also change with redshift and we can test the hypothesis that the observed evolution in the optical is due to the evolution in the covering factor of dust. the quasars have been selected from hewitt and burbidge, and the recently completed edinburgh multicolour quasar survey. none of the sources are in the central program. iso data is essential for this experiment as we need to measure the s.e.d.s of these sources in the ir and over as wide a wave- length range as possible. note- two diagrams are included in the paper version of this proposal but are excluded from the electronic version.
Instrument PHT03 , PHT22
Temporal Coverage 1996-07-21T01:48:24Z/1998-01-29T12:44:16Z
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, GOLDSCHMIDT et al., 1999, 'THE PHYSICAL CAUSES OF QUASAR EVOLUTION', 1.0, European Space Agency, https://doi.org/10.5270/esa-n9crw1a
Rights Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.