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  • 1
    Digitale Medien
    Digitale Medien
    LUMINOUS INFRARED GALAXIES (1996)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 34 (1996), S. 749-792 
    Details
    ISSN: 0066-4146
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Physik
    Notizen: Abstract At luminosities above 1011 , infrared galaxies become the dominant population of extragalactic objects in the local Universe (z〈 0.3), being more numerous than optically selected starburst and Seyfert galaxies and quasi-stellar objects at comparable bolometric luminosity. The trigger for the intense infrared emission appears to be the strong interaction/merger of molecular gas-rich spirals, and the bulk of the infrared luminosity for all but the most luminous objects is due to dust heating from an intense starburst within giant molecular clouds. At the highest luminosities (Lir〉 1012 ), nearly all objects appear to be advanced mergers powered by a mixture of circumnuclear starburst and active galactic nucleus energy sources, both of which are fueled by an enormous concentration of molecular gas that has been funneled into the merger nucleus. These ultraluminous infrared galaxies may represent an important stage in the formation of quasi-stellar objects and powerful radio galaxies. They may also represent a primary stage in the formation of elliptical galaxy cores, the formation of globular clusters, and the metal enrichment of the intergalactic medium.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.astro.34.1.749
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  • 2
    Digitale Medien
    Digitale Medien
    SOURCES OF RELATIVISTIC JETS IN THE GALAXY (1999)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 37 (1999), S. 409-443 
    Details
    ISSN: 0066-4146
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Physik
    Notizen: Abstract Black holes of stellar mass and neutron stars in binary systems are first detected as hard X-ray sources using high-energy space telescopes. Relativistic jets in some of these compact sources are found by means of multiwavelength observations with ground-based telescopes. The X-ray emission probes the inner accretion disk and immediate surroundings of the compact object, whereas the synchrotron emission from the jets is observed in the radio and infrared bands, and in the future could be detected at even shorter wavelengths. Black-hole X-ray binaries with relativistic jets mimic, on a much smaller scale, many of the phenomena seen in quasars and are thus called microquasars. Because of their proximity, their study opens the way for a better understanding of the relativistic jets seen elsewhere in the Universe. From the observation of two-sided moving jets it is inferred that the ejecta in microquasars move with relativistic speeds similar to those believed to be present in quasars. The simultaneous multiwavelength approach to microquasars reveals in short timescales the close connection between instabilities in the accretion disk seen in the X-rays, and the ejection of relativistic clouds of plasma observed as synchrotron emission at longer wavelengths. Besides contributing to a deeper understanding of accretion disks and jets, microquasars may serve in the future to determine the distances of jet sources using constraints from special relativity, and the spin of black holes using general relativity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.astro.37.1.409
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  • 3
    Digitale Medien
    Digitale Medien
    A double-sided radio jet from the compact Galactic Centre annihilator 1E1740.7–2942 (1992)
    [s.l.] : Nature Publishing Group
    Nature 358 (1992), S. 215-217 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] After the first observations with SIGMA, we initiated radio monitoring, at several wavelengths, of 1E1740.7-2942, the dominant hard X-ray source (&30keV) near the Galactic Centre4. The hard X-ray spectrum in its normal state resembles that of Cygnus X-l, one of the best candidates for ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/358215a0
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  • 4
    Digitale Medien
    Digitale Medien
    A superluminal source in the Galaxy (1994)
    [s.l.] : Nature Publishing Group
    Nature 371 (1994), S. 46-48 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] In the course of a general study of radio counterparts of /-ray sources we observed with the Very Large Array a remarkable ejection event in the transient source GRS1915+105 (ref. 6). After the observation of strong radio outbursts7'8, we have fol-lowed the large proper motions of a pair of bright ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/371046a0
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  • 5
    Digitale Medien
    Digitale Medien
    Microquasars in our Galaxy (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 392 (1998), S. 673-676 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Microquasars are stellar-mass black holes in our Galaxy that mimic, on a smaller scale, many of the phenomena seen in quasars. Their discovery opens the way for a new understanding of the connection between the accretion of matter onto black holes and the origin of the relativistic jets observed in ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/33603
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  • 6
    Digitale Medien
    Digitale Medien
    A high-velocity black hole on a Galactic-halo orbit in the solar neighbourhood (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 413 (2001), S. 139-141 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Only a few of the dozen or so known stellar-mass black holes have been observed away from the plane of the Galaxy. Those few could have been ejected from the plane as a result of a ‘kick’ received during a supernova explosion, or they could be remnants of the population of massive ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/35093060
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  • 7
    Digitale Medien
    Digitale Medien
    An enigmatic long-lasting γ-ray burst not accompanied by a bright supernova (2006)
    [s.l.] : Nature Publishing Group
    Nature 444 (2006), S. 1050-1052 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Gamma-ray bursts (GRBs) are short, intense flashes of soft γ-rays coming from the distant Universe. Long-duration GRBs (those lasting more than ∼2 s) are believed to originate from the deaths of massive stars, mainly on the basis of a handful of solid associations between GRBs ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/nature05374
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  • 8
    Digitale Medien
    Digitale Medien
    X-ray, UV and FIR emission of Seyfert galaxies (1993)
    Springer
    Astrophysics and space science 205 (1993), S. 113-121 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have compiled multiwavelength data (in the radio, FIR, optical, UV and X-ray ranges) for a sample of 126 galaxies, including QSO, Seyfert 1, Seyfert 2 and galaxies dominated by star-forming processes. We have tested the implications of “unified Seyfert models”, which assume that Seyfert 1 and 2 galaxies are intrinsically the same kind of objects, but seen at different angles. A dense obscuring torus around the nuclcus would originate the spectral differences actually observed. From our data we conclude that the UV-soft X-ray emission can not be seen through the torus. On the other hand, the occultation/reflection picture underestimates significantly the UV luminosity. We propose a scheme in which the intensity of the non-thermal nuclear engine decreases from QSO to Sy 2 galaxies, while the relative contribution of star-forming regions increases in the same direction. The relatively low soft X-ray emission in Sy 2 galaxies implies that their UV radiation should be dominated by starbursts, rather than by the nuclear engine.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00657965
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  • 9
    Digitale Medien
    Digitale Medien
    Soft gamma-ray bursts from the superluminal source GRS 1915+105? (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 65-68 
    Details
    ISSN: 1572-946X
    Schlagwort(e): Soft Gamma Ray Bursts ; Hard X-ray Transients ; Superluminal Sources
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The power required to eject relativistic plasma clouds in the hard X-ray transient GRS 1915+105 is at least 100 times the luminosity of the softϒ-ray bursts (SGRs) that were observed by BATSE from the same region of the sky in the year 1992. We show that there are spatial, time, and spectral coincidences between GRS 1915+105 and the SGRs observed by BATSE which suggest that they are one and the same source. However, the position of the SGRs is rather uncertain and until better positions are obtained, the question on the association of GRS 1915+105 with the SGRs must remain open.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00658589
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  • 10
    Digitale Medien
    Digitale Medien
    Study of a neutral hydrogen feature previously observed by Cugnon (1975)
    Springer
    Astrophysics and space science 33 (1975), S. 23-41 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An anomalous velocity cloud nearl=349°,b=+3°, was investigated by Cugnon (1968). The authors made a new set of observations in order to obtain a more complete picture of the feature, including the region originally out of Cugnon's limit of observation. A comparison with optical and radio observations was made and several possibilities of interpretation as to the nature of the object were analyzed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00646006
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