Sökning: onr:"swepub:oai:DiVA.org:uu-197179" >
A search for electr...
-
van Groningen, Ernst
(författare)
A search for electron-scattered wings in Halpha in Seyfert-1 galaxies
- Artikel/kapitelEngelska1989
Förlag, utgivningsår, omfång ...
Nummerbeteckningar
-
LIBRIS-ID:oai:DiVA.org:uu-197179
-
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-197179URI
Kompletterande språkuppgifter
-
Språk:engelska
-
Sammanfattning på:engelska
Ingår i deldatabas
Klassifikation
-
Ämneskategori:ref swepub-contenttype
-
Ämneskategori:art swepub-publicationtype
Anmärkningar
-
Spectra were obtained of a dozen bright Seyfert-1 galaxies to search for the presence of ultra-broad wings in Halpha, caused by electron scattering in the hypothetical hot intercloud medium. The spectra, which covered the wavelength range from 5300 Aring to 8750 Aring, were carefully calibrated to obtain the accurate continuum shape. In no case were ultra-broad wings of the type expected from electron scattering found, although significantly broader wings are detected than in previous data. Synthesized spectra were used to estimate the sensitivity of the survey for electron scattered wings. The results can be converted into a lower limit on the temperature of 7times10 7 K, and an upper limit of 0.15 on the electron scattering optical depth
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
-
van Weeren, N.
(författare)
Sammanhörande titlar
-
Ingår i:Astronomy and Astrophysics211:2, s. 318-3233230004-63611432-0746
Internetlänk
Hitta via bibliotek
Till lärosätets databas