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  • 1
    Electronic Resource
    Electronic Resource
    THE CANADA-FRANCE REDSHIFT SURVEY (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 759 (1995), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Notes: The Canada-France Redshift Survey (CFRS), conducted with the CFHT MOS spec-trograph, has provided secure redshifts for ∼600 galaxies with 0≤z≤1.3 of which more than 350 are at z≥0.5. This unique data set allows to investigate the evolution of the luminosity function of galaxies over timescales ∼50% the present age of the universe. We find that the luminosity function of red galaxies does not change much over the redshift range of the CFRS, while the luminosity function of blue galaxies is strongly evolving, consistent with a ∼1 magnitude brightening at z∼0.75 (but equivalently described by an increase in comoving density). Morphological information with HST will help to establish whether the evolution we observe is due to simple brightening of individual objects with look-back time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1995.tb17620.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Gravitational mirages
    Amsterdam : Elsevier
    Endeavour 12 (1988), S. 124-132 
    Details
    ISSN: 0160-9327
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0160-9327(88)90133-0
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  • 3
    Electronic Resource
    Electronic Resource
    Problems and difficulties in editing Kepler's collected works
    Amsterdam : Elsevier
    Vistas in Astronomy 9 (1967), S. 261-264 
    Details
    ISSN: 0083-6656
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0083-6656(67)90034-7
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  • 4
    Electronic Resource
    Electronic Resource
    A young source of optical emission from distant radio galaxies (1993)
    [s.l.] : Nature Publishing Group
    Nature 362 (1993), S. 324-326 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] One of the keys to understanding the nature of distant radio galaxies is the study of their optical continuum, and multiple broad-band photometry has been extensively used to examine their spectral energy distribution, often in conjunction with stellar population synthesis models. Contamination ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/362324a0
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  • 5
    Electronic Resource
    Electronic Resource
    Is 3C324 the first gravitationally lensed giant galaxy? (1987)
    [s.l.] : Nature Publishing Group
    Nature 326 (1987), S. 268-269 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On the basis of the confrontation of available data, with a theoretical analysis of the perturbations induced on the Hubble diagram by inhomogeneities in the actual Universe, two of us recently proposed that gravitational amplification of light affects far more extragalactic observations than ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/326268a0
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  • 6
    Electronic Resource
    Electronic Resource
    New views through the gravitational telescope (1990)
    Springer
    Astrophysics and space science 170 (1990), S. 389-393 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New improvements in extragalactic research have recently increased the number of sources at high redshift, i.e., QSOs and especially galaxies. Gravitational lensing/magnification events are more common among them, particularly because gravitationally magnified sources are preferentially selected in the flux-limited catalogues used to find distant sources. They offer a means of investigating the matter distribution from small scales (microlensing) to large scales (macrolensing). Recent observations and realistic mass distribution models of the arc-like structures (in A370 and CI 2244-02) allow us to describe the observations well and to set new and independent conditions on the material content of the deflecting clusters; they also allow detailed studies of sources which are at the ends of the gravitational telescopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652699
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  • 7
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    The NGC 4013 tale: a pseudo-bulged, late-type spiral shaped by a major merger (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-08
    Description: Many spiral galaxy haloes show stellar streams with various morphologies when observed with deep images. The origin of these tidal features is discussed, either coming from a satellite infall or caused by residuals of an ancient, gas-rich major merger. By modelling the formation of the peculiar features observed in the NGC 4013 halo, we investigate their origin. By using gadget -2 with implemented gas cooling, star formation, and feedback, we have modelled the overall NGC 4013 galaxy and its associated halo features. A gas-rich major merger occurring 2.7–4.6 Gyr ago succeeds in reproducing the NGC 4013 galaxy properties, including all the faint stellar features, strong gas warp, boxy-shaped halo and vertical 3.6 μm luminosity distribution. High gas fractions in the progenitors are sufficient to reproduce the observed thin and thick discs, with a small bulge fraction, as observed. A major merger is able to reproduce the overall NGC 4013 system, including the warp strength, the red colour and the high stellar mass density of the loop, while a minor merger model cannot. Because the gas-rich model suffices to create a pseudo-bulge with a small fraction of the light, NGC 4013 is perhaps the archetype of a late-type galaxy formed by a relatively recent merger. Then late type, pseudo-bulge spirals are not mandatorily made through secular evolution, and the NGC 4013 properties also illustrate that strong warps in isolated galaxies may well occur at a late phase of a gas-rich major merger.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 8
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    GRB host galaxies with VLT/X-Shooter: properties at 0.8 〈 z 〈 1.3 (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-06
    Description: Long gamma-ray bursts (LGRBs) are associated with the death of massive stars. Their host galaxies therefore represent a unique class of objects tracing star formation across the observable Universe. Indeed, recently accumulated evidence shows that GRB hosts do not differ substantially from general population of galaxies at high ( z  〉 2) redshifts. However, it has been long recognized that the properties of z  〈 1.5 hosts, compared to general star-forming population, are unusual. To better understand the reasons for the supposed difference in LGRB hosts properties at z  〈 1.5, we obtained Very Large Telescope (VLT)/X-Shooter spectra of six hosts lying in the redshift range of 0.8 〈  z  〈 1.3. Some of these hosts have been observed before, yet we still lack well-constrained information on their characteristics such as metallicity, dust extinction and star formation rate (SFR). We search for emission lines in the VLT/X-Shooter spectra of the hosts and measure their fluxes. We perform a detailed analysis, estimating host average extinction, SFRs, metallicities and electron densities where possible. Measured quantities of our hosts are compared to a larger sample of previously observed GRB hosts at z  〈 2. SFRs and metallicities are measured for all the hosts analysed in this paper and metallicities are well determined for four hosts. The mass–metallicity relation, the fundamental metallicity relation and SFRs derived from our hosts occupy similar parameter space as other host galaxies investigated so far at the same redshift. We therefore conclude that GRB hosts in our sample support the found discrepancy between the properties of low-redshift GRB hosts and the general population of star-forming galaxies.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 9
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    Observation and Structure Determination of an Oxide Quasicrystal Approximant (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-08-26
    Description: Author(s): S. Förster, M. Trautmann, S. Roy, W. A. Adeagbo, E. M. Zollner, R. Hammer, F. O. Schumann, K. Meinel, S. K. Nayak, K. Mohseni, W. Hergert, H. L. Meyerheim, and W. Widdra We report on the first observation of an approximant structure to the recently discovered two-dimensional oxide quasicrystal. Using scanning tunneling microscopy, low-energy electron diffraction, and surface x-ray diffraction in combination with ab initio calculations, the atomic structure and the b… [Phys. Rev. Lett. 117, 095501] Published Wed Aug 24, 2016
    Keywords: Condensed Matter: Structure, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    The main sequence of star-forming galaxies at z ~ 0.6: reinstating major mergers (2014)
    Oxford University Press
    Details
    Publication Date: 2014-07-03
    Description: The relation between the star formation rate (SFR) and the stellar mass of star-forming galaxies has been used to argue that major mergers cannot be the main driver of star formation. Here, we re-examine these arguments using the representative IMAGES-CDFS sample of star-forming galaxies at z = 0.4–0.75, taking advantage of their previously established classification into pre-fusion, fusion, and relaxing galaxy mergers. Contrary to previous claims, we show there is no tension between the main-sequence scatter and the average duration of the fusion SFR peak. We confirm previous estimates of the fraction of SFR due to morphologically selected galaxies (~23 per cent) or the SFR enhancement due to major merger during the fusion phase (~10 per cent). However, galaxy mergers are not instantaneous processes, which implies that the total fraction of the SFR associated with galaxies undergoing major mergers must account for the three merger phases. When doing so, galaxies involved in major mergers are found to represent 53–88 per cent of the total SFR at z ~ 0.6. The fraction of luminous infrared galaxies (LIRGs) in the fusion phase is found to be in agreement with the observed morphological fraction of LIRGs without discs and with the observed and expected major merger rates at z ≤ 1.5.
    Print ISSN: 1745-3925
    Electronic ISSN: 1745-3933
    Topics: Physics
    Published by Oxford University Press
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