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  • 1
    Electronic Resource
    Electronic Resource
    Spectral inversion of the generalized Abel integral transform
    Amsterdam : Elsevier
    Journal of Quantitative Spectroscopy and Radiative Transfer 49 (1993), S. 149-156 
    Details
    ISSN: 0022-4073
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-4073(93)90055-M
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  • 2
    Electronic Resource
    Electronic Resource
    Site-Testing Results at La Palma Observatory (1998)
    Springer
    Astrophysics and space science 263 (1998), S. 373-376 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002149114796
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  • 3
    Electronic Resource
    Electronic Resource
    The new site testing survey in the Canary Islands' Observatories (1990)
    Springer
    Astrophysics and space science 171 (1990), S. 267-273 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The future establishment of large telescopes at the Observatorio del Roque de los Muchachos (ORM) has raised the necessity of designing a site-testing campaign, aimed specifically at selecting their emplacements, as well as characterizing correctly the local seeing behaviour and the fluctuations of the turbulent field in the area covered by the observatory. This paper describes the site evaluation programme to be carried out at the ORM during the next four years. The data obtained in this program will improve earlier tests in the critical areas of sub-are sec seeing, the size of the isoplanatic patch, the ‘efecto Caldera’ and suitability for infrared astronomy, among others.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646861
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  • 4
    Electronic Resource
    Electronic Resource
    A photometric study of the double ring structure of NGC 4736 (1989)
    Springer
    Astrophysics and space science 156 (1989), S. 301-313 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this study we present photometric results for the galaxy NGC 4736: infrared and visible profiles. After a careful correction for the extinction within the galaxy based on measured neutral gas surface densities, we interpret the profiles in the individual bands and in colour indices, in terms of the radial distribution of stellar populations. We pick out the behaviour of the two rings, an inner ring some 40–50 arc sec from the nucleus, and an outer ring some 300 arc sec away. We show how the photometry allows us to make tentative physical inferences about the nature of these two structures, showing that the inner ring is connected with an outflow of gas observed via itsHii regions, and is probably the result of an axisymmetric starburst, while the outer ring is a site of star formation which appears to be further from the centre than the typical resonant structures associated with a density wave.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646382
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  • 5
    Electronic Resource
    Electronic Resource
    Taurus observations of the velocity field in the inner zone of NGC 6946 (1989)
    Springer
    Astrophysics and space science 157 (1989), S. 157-163 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have obtained a two-dimensional velocity map in Hα of the inner 4 arc min zone of the Scd starburst galaxy NGC 6946 using the TAURUS interferometric spectrometer on the 2.5 m Isaac Newton Telescope. The major axis rotation curve is a cleen kinematic superposition of a central 1 kpc sphere with solid body rotation and a disc with density falling inversely with radius. We show clear evidence of symmetrical radial motions in the plane of the galaxy with velocity up to 100 km s−1 along axes offset from the major axis by up to ±30°. Along the bar at position angle 160° we see outflow out to −2 kpc and significant inflow beyond this radius. These velocity fields give clues to the nature of the starburst process within the central 1 kpc zone of the galaxy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637323
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  • 6
    Electronic Resource
    Electronic Resource
    Mass outflow and its consequences in the circumnuclear zones of galaxies (1988)
    Springer
    Astrophysics and space science 147 (1988), S. 173-187 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The distribution of hydrogen gas, atomic plus molecular, in the discs of spiral galaxies, takes two characteristic extreme alternative forms. In one, the density peaks at the nucleus, and falls radially monotonically and roughly exponentially with radius. In the other there is a ‘hole’ in the gas distribution in the circumnuclear region. In this paper we examine the distributions of gas, and the kinematics in the central zones of a number of spirals which have been observed both spectroscopically and with photometric mapping. We find in addition to a ring structure in the gas, there is often measurable expansion with higher radial velocities occurring near the nucleus. Associated with the more expanded of these ring structures there appear annuli of younger stars with enhanced metallicities; and inside the gaseous ring older, less metallic populations. A strong correlation exists between the absence of central gas and the size of the nuclear bulge of a galaxy: Sa's and Sb's have lower ratios of gas to stars than Sc's and Sd's. We show that radially progressive bursts of star formation can account for a wide range of these observed phenomena and could be related to the presence ofliners in the interstellar medium close to the nucleus. The energetics and dynamical balance within the burst are considered in terms of three sources of outflow: supernovae, stellar winds, and radiation from massive stars, with the probability that all these mechanisms contribute to the collective phenomenon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656617
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  • 7
    Electronic Resource
    Electronic Resource
    Photometric separation of the bulge and disc components of spirals using CCD imaging (1990)
    Springer
    Astrophysics and space science 170 (1990), S. 225-229 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present high-resolution CCD images of a sample of spiral galaxies, in infrared photometric bands, obtained at the Cassegrain focus of the 1 m Jacobus Kapteyn Telescope, La Palma. A decisive advantage of the linearity in these images is that we can effect a reliable separation of the light from bulge and disc. We describe possible applications of the results to determine the structure of the bulges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652672
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  • 8
    Electronic Resource
    Electronic Resource
    Long slit spectroscopy of the nuclear zone of NGC 253 (1990)
    Springer
    Astrophysics and space science 170 (1990), S. 315-317 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have undertaken a study of the physical conditions of the lonized gas within the starburst region of the galaxy NGC 253, using long slit spectroscopy at high spatial and spectral resolution. Our aim was to identify the appropriate parameters describing the dynamics of the gas and the excitation conditions, in relation with the starburst process. Non-gaussian line profiles and line spliting are clearly observed, indicating a complicated dynamical structure; furthermore, the zones presenting non-circular motions and localized outflow of gas have been spatially sampled at the seeing limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652686
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  • 9
    Electronic Resource
    Electronic Resource
    Departures from axial symmetry, and starburst activity, in the bulge of NGC 4736 (1990)
    Springer
    Astrophysics and space science 170 (1990), S. 305-310 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Evidence for circumnuclear starbursts in spiral galaxies can take the form of a blue excess near the nucleus, but more frequently (because of dust extinction)Hi or radio continuum emission. Such bursts are quite common, even in objects with no interacting companions. One consequence of a burst is to sweep gas outwards from the inner zone, so further bursts (and perhaps the initial one) need to be re-supplied with gas. This can be effectedvia a non-axisymmetric gravitational potential, not necessarily a bar, in the nuclear bulge. Searching for these non-axisymmetric features, we have performed two-dimensional photometry on CCD maps inB, V, R, I, andZ bands, for a set of galaxies which have undergone starburst activity, and we present here a set of results from that photometric programme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652684
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  • 10
    Electronic Resource
    Electronic Resource
    Gradients of excitation in the nuclei of starburst galaxies (1989)
    Springer
    Astrophysics and space science 157 (1989), S. 165-171 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This article forms a part of a wider study of the nuclear and circum-nuclear zones of moderately active galaxies. The use of long-slit spectroscopy at high spectral and spatial resolution has enabled us to measure gradients of gaseous excitation and also velocity fields in a sample of four bright nuclear starburst galaxies selected from the sample of Balzano (1983). We find variations not only in the intensity but also in the ‘quality’ of the emission spectra (line ratios and line widths) of the interstellar gas between regions separated by relatively short distances. We stress the need for studies with at least the present degree of angular and spectral resolution if physical sense is to be made of the interstellar excitation regimes in external galaxies, as well as to investigate a possible evolutionary link between nuclei of intermediate activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637324
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