| 1. |
- Bååth, L.B. 1948-
(författare)
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AGN Variability and VLBI
- 1994
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Ingår i: Multi-Wavelength Continuum Emission of Agn. - Dordrecht : Kluwer Academic Publishers. - 0792327446 - 0792327454 ; , s. 181-186
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Bokkapitel (refereegranskat)abstract
- This contribution discusses the connection between variability in radio and optical with structural variations observed with VLBI. Structural changes do not have to start in the core, and intensity variations may be caused by components in the jet outside the core. The scenario is probably more complicated than present day theories assume.
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| 2. |
- Bååth, L.B. 1948-
(författare)
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Global Fringe Fitting Applied to 100 GHZ VLBI Data
- 1991
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Ingår i: Frontiers of VLBI. - Tokyo : Universal Academy Press. - 494644307X ; , s. 353-359
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Bokkapitel (refereegranskat)abstract
- Earlier epoches of mm VLBI observations relied on single baseline fit of delays and rates to find the fringes. This approach does not, however, make use of all available information and therefore is less sensitive than is necessary. Global fringe fitting makes use of all simultaneous data to find station related clock offsets and rates over a certain period of time. © Universal Academy Press, Inc.
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| 3. |
- Bååth, L.B. 1948-
(författare)
-
High Resolution Observations of Low Frequency Variables at 932 MHz
- 1987
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Ingår i: The Impact of VLBI on Astrophysics and Geophysics. - Dordrecht : Kluwer Academic Publishers. - 902772704X - 9027727058 ; , s. 117-118
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Bokkapitel (refereegranskat)abstract
- Fifteen sources known to be varying at low frequencies have been observed at six epochs during 1983–84 with a global VLBI array. Some of the sources show structural variations similar to the superluminals. Beaming effect may therefore play an important role at low as well as at higher frequencies.
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| 4. |
- Bååth, L.B. 1948-
(författare)
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Mapping in Practice
- 1989
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Ingår i: Very Long Baseline Interferometry. - Dordrecht : Kluwer Academic Publishers. - 9789401075954 - 9789400924284 - 0792303768 ; , s. 199-230
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Bokkapitel (refereegranskat)abstract
- The purpose of this lecture is to introduce the VLBI user to the practical details of mapping radio sources. I will concentrate on data processing and mapping with the AIPS (Thompson and D’Addario, 1982)-package. Other data reduction systems do exist, e.g. the Caltech-package and OLAF. These differ from AIPS mostly in the strategy for reaching the final and “best” map. It is more important to know the method and to be careful than what reduction procedure is used.
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| 5. |
- Bååth, L.B. 1948-
(författare)
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Millimetre VLBI capability status
- 1993
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Ingår i: Sub-arcsecond Radio Astronomy. - Cambridge : Cambridge University Press. - 0521434726 ; , s. 431-433
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Bokkapitel (refereegranskat)abstract
- The development of new reveiver and data reduction techniques have now made VLBI at mm wavelengths possible. This contribution discusses the capability of the present and future VLBI networks at λ1 and 3mm and compares with radio interferometers at other wavelength regimes.
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| 6. |
- Bååth, Lars B., 1948-
(författare)
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mm VLBI
- 1993
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Ingår i: VLBI Technology – Progress and Future Observational Possibilities. - Tokyo : Terra Scientific Publishing Company. ; , s. 70-74
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Bokkapitel (refereegranskat)abstract
- Very long Baseline Interferometry (VLBI) has now made its break-through into the mm wavelength regime. A global VLBI array has produced maps of radio sources at 3 mm since 1988 and development is under way to improve the sensitivity for VLBI also at 1 mm. This contribution discusses the present state of mm VLBI and the future developments.
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| 7. |
- Bååth, L.B. 1948-
(författare)
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mm VLBI vs. VSOP
- 1991
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Ingår i: Frontiers of VLBI. - Tokyo : Universal Academy Press. - 494644307X ; , s. 197-201
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Bokkapitel (refereegranskat)abstract
- VSOP-to-ground VLBI and mm VLBI are both needed if we want to further increase our knowledge of quasars, radio galaxies and their radio jets, mm VLBI will be a better instrument to study the "central engine" while satellite VLBI will better show the structure of the jets. The two instruments complement each other, and it is important to have a close collaboration. © Universal Academy Press, Inc.
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| 8. |
- Bååth, L.B. 1948-
(författare)
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Radiogalaxer och kvasarer
- 1990
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Ingår i: Astronomisk årsbok 1991. - Johanneshov : Inova. - 918599622X ; , s. 71-77
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Bokkapitel (refereegranskat)
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| 9. |
- Bååth, L.B. 1948-
(författare)
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Results from 100 GHz VLBI
- 1991
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Ingår i: Frontiers of VLBI. - Tokyo : Universal Academy Press. - 494644307X ; , s. 285-295
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Bokkapitel (refereegranskat)abstract
- Development of receiver and data reduction techniques have now made it possible to produce hybrid maps from global VLBI experiments observing at 100 GHz. Maps are shown here of the compact radio sources 3C 273, 3C 345, 3C 84, BL Lac and OJ 287 with angular resolution of 50 μas. The component born during the 1988 outburst of 3C 273 is seen only 2 month after its birth. The jet of 3C 345 is seen to have a larger curvature than has previously been observed.A component is seen moving outwards from the core of 3C84 with a speed of ≈21000 km sec-1. © Universal Academy Press, Inc.
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| 10. |
- Bååth, L.B. 1948-
(författare)
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Superluminal Motion in CTA 102
- 1987
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Ingår i: Superluminal Radio Sources. - Cambridge : Cambridge University Press. - 052134560X ; , s. 206-210
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Bokkapitel (refereegranskat)
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