| 1. |
- Bergvall, N, et al.
(författare)
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Optical/near-IR surface photometry of blue low surface brightness galaxies
- 1999
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Ingår i: ASTRONOMY AND ASTROPHYSICS. - : SPRINGER VERLAG. - 0004-6361. ; 341:3, s. 697-708
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Tidskriftsartikel (refereegranskat)abstract
- We present luminosity profiles, colour profiles and disk parameters based on near-infrared JHK surface photometry of a sample of blue low surface brightness galaxies (BLSBGs). The results are discussed along with previously obtained optical data. We find
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| 2. |
- BERGVALL, N, et al.
(författare)
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ESO-146-G14, A RETARDED DISC GALAXY
- 1995
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Ingår i: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - : BLACKWELL SCIENCE LTD. - 0035-8711. ; 273:3, s. 603-614
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Tidskriftsartikel (refereegranskat)abstract
- In our search for nearby young and unevolved galaxies we encountered ESO 146 - G14, a blue low-surface-brightness late-type disc galaxy with remarkable properties. The analysis of the chemical abundances of the brightest Hn regions yields an oxygen abunda
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| 3. |
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| 4. |
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| 5. |
- Ronnback, J, et al.
(författare)
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A distant elliptical galaxy seen through a foreground spiral
- 1997
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Ingår i: ASTRONOMY AND ASTROPHYSICS. - : SPRINGER VERLAG. - 0004-6361. ; 322:1, s. 38-40
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The radio source PKS 0400-181 is a classical edge-brightened radio double, which was tentatively identified with a faint red object thought to be a distant galaxy located behind a z = 0.0367 spiral galaxy. The properties of the red object were found to be
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| 6. |
- RONNBACK, J, et al.
(författare)
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BLUE LOW SURFACE-BRIGHTNESS GALAXIES .2. SPECTROSCOPY AND CHEMICAL ABUNDANCES
- 1995
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Ingår i: ASTRONOMY AND ASTROPHYSICS. - : SPRINGER VERLAG. - 0004-6361. ; 302:2, s. 353-363
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Tidskriftsartikel (refereegranskat)abstract
- In our continued search for young/unevolved galaxies at low redshift we have obtained spectroscopic observations of 16 blue low surface-brightness galaxies. These galaxies are among the bluest and dimmest objects found in the ESO-Uppsala Catalogue. Oxygen
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| 7. |
- Ronnback, J., et al.
(författare)
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Host galaxies of intermediate redshift radio-loud and radio-quiet quasars
- 1996
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Ingår i: Monthly notices of the Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 283:1, s. 282-296296
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Tidskriftsartikel (refereegranskat)abstract
- In a search for host galaxies associated with quasars, the authors present results from deep CCD imaging using the European Southern Observatory 3.5-m New Technology Telescope. Altogether 21 targets, 12 radio-loud and nine radio-quiet quasars, were observed in R, and additional V and Gunn i images were collected for a subgroup of these. The quasar redshifts are between 0.4 and 0.8, a range largely unexplored in previous studies. At these redshifts the R band corresponds to a rest-frame wavelength between 4600 and 3600 Aring. Thus, the authors are primarily probing the light from young stellar components of the presumed host galaxies. To separate out the light originating from the host object the authors remove the quasar contribution by scaling the point spread function (PSF). The PSF is a combination of an empirical PSF model, derived from stars lying in the same field as the quasars (used for the core of the PSF), and an analytical model for the wings of the PSF. After PSF subtraction of the QSO image the authors identify extended residual objects in 17 targets (nine in radio-loud and eight in radio-quiet quasars), of which a few are only marginal detections. These objects are large and luminous and their colours are relatively blue. Their V-R colours are consistent with a stellar population typical of late-type spirals and irregular galaxies. The blue colours could be caused by recent star formation events or by scattering of the QSO light
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| 8. |
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