| 1. |
- van Groningen, Ernst, et al.
(author)
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A search for electron-scattered wings in Halpha in Seyfert-1 galaxies
- 1989
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In: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 211:2, s. 318-323323
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Journal article (peer-reviewed)abstract
- 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
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| 5. |
- Ronnback, Jari, et al.
(author)
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Host galaxies of intermediate redshift radio-loud and radio-quiet quasars
- 1996
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In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - : BLACKWELL SCIENCE LTD. - 0035-8711. ; 283:1, s. 282-296
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Journal article (peer-reviewed)abstract
- In a search for host galaxies associated with quasars, we present results from deep CCD imaging using the European Southern Observatory (ESO) 3.5-m New Technology Telescope (NTT). 21 targets, 12 radio-loud and nine radio-quiet quasars, were observed in R,
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| 6. |
- Sundin, Peter, et al.
(author)
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International Science Programme : Annual Report for 2009
- 2010
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Reports (pop. science, debate, etc.)abstract
- ISP provides long-term support for the development of active and sustainable research environments within these basic sciences in developing countries. The support is directed to research groups and regional networks. The work is carried out in close cooperation with research groups at more advanced host institutions. Although Uppsala University is the base of the operation, ISP functions as a national programme and host laboratories may be at other Swedish universities, in other Nordic and European countries, and in the regions. This is to meet the requests from developing countries on their own terms.ISP funding is used for equipment, spare parts, consumables, technical services, literature, computer hard- and software, and costs associated with arranging and participating in meetings, exchange visits, training, etc. Besides what has been achieved in terms of development and maintenance of resources, contacts, etc., the results of ISP support in 2009 can be summarized based on the expenditures. For each MEUR spent (assuming that one EUR equals 10 SEK) the outcome was:19 PhD graduations,59 MSc/MPhil graduations,45 international publications,58 regional or national publicationst,113 conference contributions (34% of which international), and20 conferences/workshops etc. arranged.
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| 7. |
- Sundin, Peter, et al.
(author)
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International Science Programme : Annual Report for 2008
- 2009
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Reports (pop. science, debate, etc.)abstract
- ISP provides long-term support for the development of active and sustainable research environments within these basic sciences in developing countries. The support is directed to research groups and regional networks. The work is carried out in close cooperation with research groups at more advanced host institutions. Although Uppsala Univ. is the base of the operation, ISP functions as a national programme and host laboratories may be located at other Swedish universities, in other Nordic and European countries, and in the regions. This is to meet the requests from developing countries on their own terms.ISP support includes equipment, spare parts consumables, technical services, literature, computer hard- and software, and all costs associated with participating in meetings, exchange visits, training, etc. Besides what has been achieved in terms of development and maintenance of resources, contacts, etc., the outcome of ISP support in 2008 can be summarized by the following figures (assuming that one € equals 10 SEK):19 PhD graduations per M€ invested.54 MSc/MPhil graduations per M€ invested.80 international publications per M€ invested.27 regional or national publications per M€ invested.129 conference contributions (> 40% of which international) per M€ invested.
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| 8. |
- van Groningen, Ernst
(author)
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Further evidence for Raman scattering in RR Tel
- 1993
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In: Monthly notices of the Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 264:4, s. 975-979979
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Journal article (peer-reviewed)abstract
- Raman scattering of O VIlambdalambda13O2, 1308 photons on the ground level of neutral hydrogen has been suggested as the cause of the broad emission features at 6825 and 7088 Aring in the spectra of symbiotic stars. The authors report on the detection of other Raman lines in the optical spectrum of the symbiotic star RR Tel. The lines detected are two He II Balmer lines that are Raman-scattered to wavelengths close to hydrogen Hbeta and Hgamma. Another possible detection is scattered C III lambda977, which appears at about 4977 Aring in the optical spectrum
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| 10. |
- Örndahl, E., et al.
(author)
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An optical imaging study of 0.4 <= z <= 0.8 quasar host galaxies. I. Observations and reduction
- 2003
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In: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 404, s. 883-899
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Journal article (peer-reviewed)abstract
- We have conducted an optical imaging study aimed at resolving the host galaxies of 79 radio-loud and radio-quiet quasars at z=0.4-0.8, extending the number of investigated objects in this redshift range by ~ 45%. Observations were performed mainly in the R band but also in V and I band using the Nordic Optical Telescope on La Palma. In this paper we discuss the sample composition and observations and the reduction techniques used. The quasars were selected in pairs of radio-loud and radio-quiet objects matched in the z-V plane in order to facilitate a statistical comparison. The radio-loud part of the sample contains comparable numbers of flat and steep radio spectrum sources which also are matched in redshift and V magnitude. Point spread function subtraction was performed using one-dimensional luminosity profiles both on the quasar image and on a field star, and subtracted images and luminosity profiles are shown for each quasar field. The detection rate is 60% for the radio-quiet host galaxies and 80% for radio-loud hosts. The host galaxies have magnitudes which make them brighter than an L* galaxy by a factor of 1.5-4 at the low end of the redshift range, which increases by 2-3 times towards the higher end of the redshift range. Both radio-quiet and radio-loud hosts follow the radio galaxy R-z Hubble relation well. Analysis and discussion of colours and morphology is presented in \citet{orn}. Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.
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