Search Results - (Author, Cooperation:S. Mereghetti)

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  1. 1
    M. Tavani ; A. Bulgarelli ; V. Vittorini ; A. Pellizzoni ; E. Striani ; P. Caraveo ; M. C. Weisskopf ; A. Tennant ; G. Pucella ; A. Trois ; E. Costa ; Y. Evangelista ; C. Pittori ; F. Verrecchia ; E. Del Monte ; R. Campana ; M. Pilia ; A. De Luca ; I. Donnarumma ; D. Horns ; C. Ferrigno ; C. O. Heinke ; M. Trifoglio ; F. Gianotti ; S. Vercellone ; A. Argan ; G. Barbiellini ; P. W. Cattaneo ; A. W. Chen ; T. Contessi ; F. D'Ammando ; G. DePris ; G. Di Cocco ; G. Di Persio ; M. Feroci ; A. Ferrari ; M. Galli ; A. Giuliani ; M. Giusti ; C. Labanti ; I. Lapshov ; F. Lazzarotto ; P. Lipari ; F. Longo ; F. Fuschino ; M. Marisaldi ; S. Mereghetti ; E. Morelli ; E. Moretti ; A. Morselli ; L. Pacciani ; F. Perotti ; G. Piano ; P. Picozza ; M. Prest ; M. Rapisarda ; A. Rappoldi ; A. Rubini ; S. Sabatini ; P. Soffitta ; E. Vallazza ; A. Zambra ; D. Zanello ; F. Lucarelli ; P. Santolamazza ; P. Giommi ; L. Salotti ; G. F. Bignami
    American Association for the Advancement of Science (AAAS)
    Published 2011
    Staff View
    Publication Date:
    2011-01-08
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    A. Tiengo ; P. Esposito ; S. Mereghetti ; R. Turolla ; L. Nobili ; F. Gastaldello ; D. Gotz ; G. L. Israel ; N. Rea ; L. Stella ; S. Zane ; G. F. Bignami
    Nature Publishing Group (NPG)
    Published 2013
    Staff View
    Publication Date:
    2013-08-21
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Caraveo, P. A. ; Luca, A. De ; Mereghetti, S. ; Bignami, G. F.

    [s.l.] : Macmillian Magazines Ltd.
    Published 2003
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] Isolated neutron stars are highly magnetized, fast-rotating objects that form as an end point of stellar evolution. They are directly observable in X-ray emission, because of their high surface temperatures. Features in their X-ray spectra could in principle reveal the presence of atmospheres, ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/nature01703

    Articles: DFG German National Licenses
  4. 4
    Staff View
    ISSN:
    0273-1177
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0273-1177(91)90153-B

    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    0273-1177
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0273-1177(85)90469-7

    Articles: DFG German National Licenses
  6. 6
    Mereghetti, S. ; Caraveo, P. ; Bignami, G.F.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0273-1177
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0273-1177(93)90136-Y

    Articles: DFG German National Licenses
  7. 7
    Staff View
    ISSN:
    0273-1177
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0273-1177(91)90154-C

    Articles: DFG German National Licenses
  8. 8
    Caraveo, P. A. ; Bignami, G. F. ; Giommi, P. ; Mereghetti, S. ; Paul, J. A.

    [s.l.] : Nature Publishing Group
    Published 1984
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] The CM A energy response is dependent on the input filters used. For this observation, the CMA1 used an ' aluminium/pary-lene' (Ai/Par) filter, and the CMA2 a thin (3,000 A) Lexan one. The filter transmission curves are given in rf. 10, Fig. 3.3. Briefly, the Ai/Par filter is mostly transparent ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/310481a0

    Articles: DFG German National Licenses
  9. 9
    Bignami, G. F. ; Caraveo, P. A. ; Mereghetti, S.

    [s.l.] : Nature Publishing Group
    Published 1993
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] On 4 November 1992 an observing run in service mode was made with the New Technology Telescope (NTT) of the European Southern Observatory (ESO) on La Silla, Chile. Using the Super Seeing Imager (SUSI)13 set up to take advantage of the very good seeing (0.6-0.8"), 10 exposures of 15' each were taken ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/361704a0

    Articles: DFG German National Licenses
  10. 10
    Campana, S. ; Colpi, M. ; Mereghetti, S. ; Stella, L. ; Tavani, M.
    Springer
    Published 1998
    Staff View
    ISSN:
    1432-0754
    Keywords:
    Key words:X–ray: binaries – stars: neutron – accretion – pulsars: general
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Summary. Soft X–ray Transients (SXRTs) have long been suspected to contain old, weakly magnetic neutron stars that have been spun up by accretion torques. After reviewing their observational properties, we analyse the different regimes that likely characterise the neutron stars in these systems across the very large range of mass inflow rates, from the peak of the outbursts to the quiescent emission. While it is clear that close to the outburst maxima accretion onto the neutron star surface takes place, as the mass inflow rate decreases, accretion might stop at the magnetospheric boundary because of the centrifugal barrier provided by the neutron star. For low enough mass inflow rates (and sufficiently short rotation periods), the radio pulsar mechanism might turn on and sweep the inflowing matter away. The origin of the quiescent emission, observed in a number of SXRTs at a level of $\sim 10^{32}-10^{33}\, {\rm erg\,s^{-1}}$ , plays a crucial role in constraining the neutron star magnetic field and spin period. Accretion onto the neutron star surface is an unlikely mechanism for the quiescent emission of SXRTs, as it requires very low magnetic fields and/or long spin periods. Thermal radiation from a cooling neutron star surface in between the outbursts can be ruled out as the only cause of the quiescent emission. We find that accretion onto the neutron star magnetosphere and shock emission powered by an enshrouded radio pulsar provide far more plausible models. In the latter case the range of allowed neutron star spin periods and magnetic fields is consistent with the values recently inferred from the properties of kHz quasi-periodic oscillation in low mass X–ray binaries. If quiescent SXRTs contain enshrouded radio pulsars, they provide a missing link between X–ray binaries and millisecond pulsars.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/s001590050012

    Articles: DFG German National Licenses
  11. 11
    Staff View
    ISSN:
    1572-9672
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract A new EXOSAT (LE/CMA) observation of the region in Crux (R.A. ∼11h 45m, Dec. ∼-62°) where Markert et al. (1981) reported the existence of two x-ray SNR's is presented. After “cleaning” the CMA field from the point source component, due to the UV emission of the numerous stars in the field, the smoothed x-ray contours are compared to the 408 MHz radio map of Caswell et al. (1983). The existence of two, well-separate x-ray emission regions is confirmed by EXOSAT, and the current x-ray/radio picture is not sufficent to distinguish clearly between the assumption of one or two (possibly interacting) SNR's in the region.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00179861

    Articles: DFG German National Licenses