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  • 1
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    Ionization-excitation of helium by high-resolution (e,2e) spectroscopy and 4-body distorted-wave calculations (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-10-02
    Description: Author(s): X. L. Chen, A. L. Harris, J. M. Li, T. P. Esposito, J. K. Deng, and C. G. Ning We present experimental and theoretical results for electron-impact-induced ionization and excitation of helium atoms. Using a high-sensitivity and high-resolution (e,2e) spectrometer, we measured the differential cross sections of ionization-excitation of He to the n=1−5 states of He+ at an impact ... [Phys. Rev. A 90, 042701] Published Wed Oct 01, 2014
    Keywords: Atomic and molecular collisions and interactions
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Correlation effects in out-of-plane excitation-ionization collisions (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-08-29
    Description: Author(s): A. L. Harris and T. P. Esposito We present theoretical three-dimensional fully differential cross sections (FDCSs) for electron-impact excitation-ionization of helium when the ionized electron is found outside of the scattering plane. Using our first Born approximation model, we examine the effects of electron correlation in the i... [Phys. Rev. A 90, 022716] Published Thu Aug 28, 2014
    Keywords: Atomic and molecular collisions and interactions
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    A low-magnetic-field soft gamma repeater (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-10-16
    Description: Soft gamma repeaters (SGRs) and anomalous x-ray pulsars form a rapidly increasing group of x-ray sources exhibiting sporadic emission of short bursts. They are believed to be magnetars, that is, neutron stars powered by extreme magnetic fields, B ~ 10(14) to 10(15) gauss. We report on a soft gamma repeater with low magnetic field, SGR 0418+5729, recently detected after it emitted bursts similar to those of magnetars. X-ray observations show that its dipolar magnetic field cannot be greater than 7.5 x 10(12) gauss, well in the range of ordinary radio pulsars, implying that a high surface dipolar magnetic field is not necessarily required for magnetar-like activity. The magnetar population may thus include objects with a wider range of B-field strengths, ages, and evolutionary stages than observed so far.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rea, N -- Esposito, P -- Turolla, R -- Israel, G L -- Zane, S -- Stella, L -- Mereghetti, S -- Tiengo, A -- Gotz, D -- Gogus, E -- Kouveliotou, C -- New York, N.Y. -- Science. 2010 Nov 12;330(6006):944-6. doi: 10.1126/science.1196088. Epub 2010 Oct 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut de Ciencies de l'Espai, Consejo Superior de Investigaciones Cientificas, Institut d'Estudis Espacials de Catalunya, Facultat de Ciencies, Campus UAB, Torre C5-parell, 2a planta, 08193 Bellaterra (Barcelona), Spain. rea@ieec.uab.es〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20947727" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    A variable absorption feature in the X-ray spectrum of a magnetar (2013)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2013-08-21
    Description: Soft-gamma-ray repeaters (SGRs) and anomalous X-ray pulsars (AXPs) are slowly rotating, isolated neutron stars that sporadically undergo episodes of long-term flux enhancement (outbursts) generally accompanied by the emission of short bursts of hard X-rays. This behaviour can be understood in the magnetar model, according to which these sources are mainly powered by their own magnetic energy. This is supported by the fact that the magnetic fields inferred from several observed properties of SGRs and AXPs are greater than-or at the high end of the range of-those of radio pulsars. In the peculiar case of SGR 0418+5729, a weak dipole magnetic moment is derived from its timing parameters, whereas a strong field has been proposed to reside in the stellar interior and in multipole components on the surface. Here we show that the X-ray spectrum of SGR 0418+5729 has an absorption line, the properties of which depend strongly on the star's rotational phase. This line is interpreted as a proton cyclotron feature and its energy implies a magnetic field ranging from 2 x 10(14) gauss to more than 10(15) gauss.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tiengo, Andrea -- Esposito, Paolo -- Mereghetti, Sandro -- Turolla, Roberto -- Nobili, Luciano -- Gastaldello, Fabio -- Gotz, Diego -- Israel, Gian Luca -- Rea, Nanda -- Stella, Luigi -- Zane, Silvia -- Bignami, Giovanni F -- England -- Nature. 2013 Aug 15;500(7462):312-4. doi: 10.1038/nature12386.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Istituto Universitario di Studi Superiori, piazza della Vittoria 15, I-27100 Pavia, Italy. andrea.tiengo@iusspavia.it〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23955229" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 5
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    Relativistic jet activity from the tidal disruption of a star by a massive black hole (2011)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2011-08-26
    Description: Supermassive black holes have powerful gravitational fields with strong gradients that can destroy stars that get too close, producing a bright flare in ultraviolet and X-ray spectral regions from stellar debris that forms an accretion disk around the black hole. The aftermath of this process may have been seen several times over the past two decades in the form of sparsely sampled, slowly fading emission from distant galaxies, but the onset of the stellar disruption event has not hitherto been observed. Here we report observations of a bright X-ray flare from the extragalactic transient Swift J164449.3+573451. This source increased in brightness in the X-ray band by a factor of at least 10,000 since 1990 and by a factor of at least 100 since early 2010. We conclude that we have captured the onset of relativistic jet activity from a supermassive black hole. A companion paper comes to similar conclusions on the basis of radio observations. This event is probably due to the tidal disruption of a star falling into a supermassive black hole, but the detailed behaviour differs from current theoretical models of such events.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Burrows, D N -- Kennea, J A -- Ghisellini, G -- Mangano, V -- Zhang, B -- Page, K L -- Eracleous, M -- Romano, P -- Sakamoto, T -- Falcone, A D -- Osborne, J P -- Campana, S -- Beardmore, A P -- Breeveld, A A -- Chester, M M -- Corbet, R -- Covino, S -- Cummings, J R -- D'Avanzo, P -- D'Elia, V -- Esposito, P -- Evans, P A -- Fugazza, D -- Gelbord, J M -- Hiroi, K -- Holland, S T -- Huang, K Y -- Im, M -- Israel, G -- Jeon, Y -- Jeon, Y-B -- Jun, H D -- Kawai, N -- Kim, J H -- Krimm, H A -- Marshall, F E -- P Meszaros -- Negoro, H -- Omodei, N -- Park, W-K -- Perkins, J S -- Sugizaki, M -- Sung, H-I -- Tagliaferri, G -- Troja, E -- Ueda, Y -- Urata, Y -- Usui, R -- Antonelli, L A -- Barthelmy, S D -- Cusumano, G -- Giommi, P -- Melandri, A -- Perri, M -- Racusin, J L -- Sbarufatti, B -- Siegel, M H -- Gehrels, N -- England -- Nature. 2011 Aug 24;476(7361):421-4. doi: 10.1038/nature10374.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Laboratory, University Park, Pennsylvania 16802, USA. burrows@astro.psu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21866154" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 6
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    An ultramassive, fast-spinning white dwarf in a peculiar binary system (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-09-05
    Description: White dwarfs typically have masses in a narrow range centered at about 0.6 solar mass (M(o)). Only a few ultramassive white dwarfs (mass 〉 1.2 M(o)) are known. Those in binary systems are of particular interest, because a small amount of accreted mass could drive them above the Chandrasekhar limit, beyond which they become gravitationally unstable. Using data from the x-ray multimirror mission (XMM)-Newton satellite, we show that the x-ray pulsator RX J0648.0-4418 is a white dwarf with mass 〉 1.2 M(o), based on dynamical measurements only. This ultramassive white dwarf in a post-common envelope binary with a hot subdwarf can reach the Chandrasekhar limit, and possibly explode as a type Ia supernova, when its helium-rich companion will transfer mass at an increased rate through Roche lobe overflow.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mereghetti, S -- Tiengo, A -- Esposito, P -- La Palombara, N -- Israel, G L -- Stella, L -- New York, N.Y. -- Science. 2009 Sep 4;325(5945):1222-3. doi: 10.1126/science.1176252.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Istituto Nazionale di Astrofisica-Istituto di Astrofisica Spaziale e Fisica cosmica di Milano, via E. Bassini 15, 20133 Milano, Italy. sandro@iasf-milano.inaf.it〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19729650" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Detection of gamma-ray emission from the Vela pulsar wind nebula with AGILE (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-01-02
    Description: Pulsars are known to power winds of relativistic particles that can produce bright nebulae by interacting with the surrounding medium. These pulsar wind nebulae are observed by their radio, optical, and x-ray emissions, and in some cases also at TeV (teraelectron volt) energies, but the lack of information in the gamma-ray band precludes drawing a comprehensive multiwavelength picture of their phenomenology and emission mechanisms. Using data from the AGILE satellite, we detected the Vela pulsar wind nebula in the energy range from 100 MeV to 3 GeV. This result constrains the particle population responsible for the GeV emission and establishes a class of gamma-ray emitters that could account for a fraction of the unidentified galactic gamma-ray sources.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pellizzoni, A -- Trois, A -- Tavani, M -- Pilia, M -- Giuliani, A -- Pucella, G -- Esposito, P -- Sabatini, S -- Piano, G -- Argan, A -- Barbiellini, G -- Bulgarelli, A -- Burgay, M -- Caraveo, P -- Cattaneo, P W -- Chen, A W -- Cocco, V -- Contessi, T -- Costa, E -- D'Ammando, F -- Del Monte, E -- De Paris, G -- Di Cocco, G -- Di Persio, G -- Donnarumma, I -- Evangelista, Y -- Feroci, M -- Ferrari, A -- Fiorini, M -- Fuschino, F -- Galli, M -- Gianotti, F -- Hotan, A -- Labanti, C -- Lapshov, I -- Lazzarotto, F -- Lipari, P -- Longo, F -- Marisaldi, M -- Mastropietro, M -- Mereghetti, S -- Moretti, E -- Morselli, A -- Pacciani, L -- Palfreyman, J -- Perotti, F -- Picozza, P -- Pittori, C -- Possenti, A -- Prest, M -- Rapisarda, M -- Rappoldi, A -- Rossi, E -- Rubini, A -- Santolamazza, P -- Scalise, E -- Soffitta, P -- Striani, E -- Trifoglio, M -- Vallazza, E -- Vercellone, S -- Verrecchia, F -- Vittorini, V -- Zambra, A -- Zanello, D -- Giommi, P -- Colafrancesco, S -- Antonelli, A -- Salotti, L -- D'Amico, N -- Bignami, G F -- New York, N.Y. -- Science. 2010 Feb 5;327(5966):663-5. doi: 10.1126/science.1183844. Epub 2009 Dec 31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉INAF-Osservatorio Astronomico di Cagliari, loc. Poggio dei Pini, strada 54, I-09012, Capoterra (CA), Italy. apellizz@ca.astro.it〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20044540" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
    Electronic Resource
    Electronic Resource
    The influence of side-chain modifications on the solution behavior of the capsular polysaccharide from Rhizobium trifolii strain TA-1
    Amsterdam : Elsevier
    Carbohydrate Research 186 (1989), S. 141-155 
    Details
    ISSN: 0008-6215
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0008-6215(89)84012-1
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  • 9
    Electronic Resource
    Electronic Resource
    The occultation of Mariner 10 by Mercury
    Amsterdam : Elsevier
    Icarus 29 (1976), S. 439-444 
    Details
    ISSN: 0019-1035
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0019-1035(76)90063-4
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  • 10
    Electronic Resource
    Electronic Resource
    Iridoid aglycones from Deutzia scabra
    Amsterdam : Elsevier
    Phytochemistry 23 (1984), S. 803-807 
    Details
    ISSN: 0031-9422
    Keywords: Deutzia scabra ; Saxifragaceae ; deutziogenin ; natural iridoid aglycones. ; scabrogenin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)85031-1
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