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  • 1
    Online Resource
    Online Resource
    Galaxies : Saas-Fee Advanced Course 26. Lecture Notes 1996 Swiss Society for Astrophysics and Astronomy. (1998)
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Details
    Keywords: Stars-Formation-Congresses. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (417 pages)
    Edition: 1st ed.
    ISBN: 9783540316305
    Series Statement: Saas-Fee Advanced Course Series ; v.26
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6487899
    DDC: 523.8
    Language: English
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    GEOMAR EBL
  • 2
    Online Resource
    Online Resource
    Galaxy Interactions at Low and High Redshift : Proceedings of the 186th Symposium of the International Astronomical Union , Held at Kyoto, Japan, 26-30 August 1997. (1999)
    Dordrecht :Springer Netherlands,
    Details
    Keywords: Galaxies-Congresses. ; Electronic books.
    Description / Table of Contents: Proceedings of the 186th Symposium of the International Astronomical Union, held at Kyoto, Japan, 26-30 August 1997.
    Type of Medium: Online Resource
    Pages: 1 online resource (530 pages)
    Edition: 1st ed.
    ISBN: 9789401146654
    Series Statement: International Astronomical Union Symposia Series ; v.186
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6496812
    DDC: 523.112
    Language: English
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    GEOMAR EBL
  • 3
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    Stratospheric impact of the Chisholm pyrocumulonimbus eruption: 2. Vertical profile perspective (2008)
    In:  EPIC3JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 113, D08203.
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 4
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    The NDSC ozone and temperature lidar algorithm intercomparison initiative (A2I): project overview (2004)
    In:  EPIC3Reviewed and revised papers presented at the 22nd International Laser Radar Conference (ILRC 2004) : 12 - 16 July 2004, Matera, Italy / European Space Agency. Gelsomina Pappalardo ..., eds., II. (ESA SP ; 561, Buch), 881, ISBN: 92-9092-872-7 0397-6
    Details
    Publication Date: 2019-07-17
    Description: In September 2003, the Lidar Working Group (LWG) of the Network for Detection of Stratospheric Change (NDSC) initiated an extensive project to compare the ozone and temperature algorithms used within NDSC. This initiative, referred to later as Algorithm Intercomparison Initiative (A2I), uses simulated lidar signals to test and compare various parts of the ozone and temperature lidar algorithms. In addition to the fact that it meets the requirement of the NDSC protocols, this exercise allows the detailed assessment, by all the participants, of some of the sources and magnitudes of various uncertainties associated with the algorithms, and/or with the theoretical assumptions made in these algorithms. The outcome of the A2I is to try to find common grounds in the way ozone and temperature can be retrieved in order to reduce and possibly eradicate discrepancies due to algorithm issues alone. Specific issues such as homogenizing the choice of Rayleigh extinction cross-sections, ozone absorption cross-sections, a priori information, and the definition of the vertical resolutions are among the primary targets of the A2I outcome.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
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    PAPER (OA)
  • 5
    Electronic Resource
    Electronic Resource
    Dynamics of Interacting Galaxies (1992)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 30 (1992), S. 705-742 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.30.090192.003421
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    Paper (German National Licenses)
    Fulltext
  • 6
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    Photoionization and heating of a supernova-driven turbulent interstellar medium (2014)
    Oxford University Press
    Details
    Publication Date: 2014-04-19
    Description: The diffuse ionized gas (DIG) in galaxies traces photoionization feedback from massive stars. Through three-dimensional photoionization simulations, we study the propagation of ionizing photons, photoionization heating and the resulting distribution of ionized and neutral gas within snapshots of magnetohydrodynamic simulations of a supernova-driven turbulent interstellar medium. We also investigate the impact of non-photoionization heating on observed optical emission line ratios. Inclusion of a heating term which scales less steeply with electron density than photoionization is required to produce diagnostic emission line ratios similar to those observed with the Wisconsin Hα Mapper. Once such heating terms have been included, we are also able to produce temperatures similar to those inferred from observations of the DIG, with temperatures increasing to above 15 000 K at heights | z | 1 kpc. We find that ionizing photons travel through low-density regions close to the mid-plane of the simulations, while travelling through diffuse low-density regions at large heights. The majority of photons travel small distances (100 pc); however some travel kiloparsecs and ionize the DIG.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 7
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    Models of diffuse H{alpha} in the interstellar medium: the relative contributions from in situ ionization and dust scattering (2014)
    Oxford University Press
    Details
    Publication Date: 2014-12-20
    Description: Using three-dimensional Monte Carlo radiation transfer models of photoionization and dust scattering, we explore different components of the widespread diffuse Hα emission observed in the interstellar medium of the Milky Way and other galaxies. We investigate the relative contributions of Hα from recombination emission in ionized gas and Hα that originates in H ii regions near the Galactic mid-plane and scatters off high-altitude dust in the diffuse interstellar medium. For the radiation transfer simulations, we consider two geometries for the interstellar medium: a three-dimensional fractal geometry that reproduces the average density structure inferred for hydrogen in the Milky Way, and a density structure from a magnetohydrodynamic simulation of a supernova-driven turbulent interstellar medium. Although some sight lines that are close to H ii regions can be dominated by scattered light, overall we find that less than ~20 per cent of the total Hα intensity in our simulations can be attributed to dust scattering. Our findings on the relative contribution of scattered Hα are consistent with previous observational and theoretical analyses. We also investigate the relative contributions of dust scattering and in situ ionization of high-density dust clouds in the diffuse gas. Dust scattering in these partially ionized clouds contribute ~40 per cent to the total intensity of Hα.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 8
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    Models of diffuse H{alpha} in the interstellar medium: the relative contributions from in situ ionization and dust scattering (2014)
    Oxford University Press
    Details
    Publication Date: 2014-12-29
    Description: Using three-dimensional Monte Carlo radiation transfer models of photoionization and dust scattering, we explore different components of the widespread diffuse Hα emission observed in the interstellar medium of the Milky Way and other galaxies. We investigate the relative contributions of Hα from recombination emission in ionized gas and Hα that originates in H ii regions near the Galactic mid-plane and scatters off high-altitude dust in the diffuse interstellar medium. For the radiation transfer simulations, we consider two geometries for the interstellar medium: a three-dimensional fractal geometry that reproduces the average density structure inferred for hydrogen in the Milky Way, and a density structure from a magnetohydrodynamic simulation of a supernova-driven turbulent interstellar medium. Although some sight lines that are close to H ii regions can be dominated by scattered light, overall we find that less than ~20 per cent of the total Hα intensity in our simulations can be attributed to dust scattering. Our findings on the relative contribution of scattered Hα are consistent with previous observational and theoretical analyses. We also investigate the relative contributions of dust scattering and in situ ionization of high-density dust clouds in the diffuse gas. Dust scattering in these partially ionized clouds contribute ~40 per cent to the total intensity of Hα.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 9
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    Transformations of galaxies - III. Encounter dynamics and tidal response as functions of galaxy structure (2015)
    Oxford University Press
    Details
    Publication Date: 2015-11-21
    Description: Tidal interactions between disc galaxies depend on galaxy structure, but the details of this relationship are incompletely understood. I have constructed a three-parameter grid of bulge/disc/halo models broadly consistent with cold dark matter, and simulated an extensive series of encounters using these models. Halo mass and extent strongly influence the dynamics of orbit evolution. In close encounters, the transfer of angular momentum mediated by the dynamical response of massive, extended haloes can reverse the direction of orbital motion of the central galaxies after their first passage. Tidal response is strongly correlated with the ratio v e / v c of escape to circular velocity within the participating discs. Moreover, the same ratio also correlates with the rate at which tidal tails are reaccreted by their galaxies of origin; consequently, merger remnants with ‘twin tails’, such as NGC 7252, may prove hard to reproduce unless ( v e / v c ) 2 5.5. The tidal morphology of an interacting system can provide useful constraints on progenitor structure. In particular, encounters in which halo dynamics reverses orbital motion exhibit a distinctive morphology which may be recognized observationally. Detailed models attempting to reproduce observations of interacting galaxies should explore the likely range of progenitor structures along with other encounter parameters.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 10
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    Modeling the initial conditions of interacting galaxy pairs using Identikit (2015)
    Oxford University Press
    Details
    Publication Date: 2015-11-28
    Description: We develop and test an automated technique to model the dynamics of interacting galaxy pairs. We use Identikit as a tool for modelling and matching the morphology and kinematics of the interacting pairs of equal-mass galaxies. In order to reduce the effect of subjective human judgement, we automate the selection of phase space regions used to match simulations to data, and we explore how selection of these regions affects the random uncertainties of parameters in the best-fitting model. In this work, we use an independent set of gadget SPH simulations as input data to determine the systematic bias in the measured encounter parameters based on the known initial conditions of these simulations. We test both cold gas and young stellar components in the gadget simulations to explore the effect of choosing H i versus H α as the line-of-sight velocity tracer. We find that we can group the results into tests with good, fair, and poor convergence based on the distribution of parameters of models close to the best-fitting model. For tests with good and fair convergence, we rule out large fractions of parameter space and recover merger stage, eccentricity, pericentric distance, viewing angle, and initial disc orientations within 3 of the correct value. All of tests on prograde–prograde systems have either good or fair convergence. The results of tests on edge-on discs are less biased than face-on tests. Retrograde and polar systems do not converge and may require constraints from regions other than the tidal tails and bridges.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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