兰坪坳陷上三叠统原油地球化学及有机成矿意义     

郭海花  常象春  张金亮 《地球科学与环境学报》2003,25(4):1-5

兰坪坳陷金顶矿区下含矿层产有多层稠油,储层主要为上三叠统三合洞组的灰岩和角砾状灰岩.原油地球化学特征表明有机母质是多源性的,并以低等水生藻类贡献为主,沉积水体介质以还原性占优势,具有较高盐度,有机质热演化处于成熟-高成熟阶段,生物降解改造较为强烈.铅锌金属与稠油的共生、金属硫化物的有机生物硫特征、有机质富集地区矿化强烈等均表明有机质参与了金属成矿.按照不同世代有机质与金属成矿作用机理,本区有机成矿主要以配合作用及吸附、还原作用为主.  相似文献   

Atlas of M7III Spectral Features in the Optical     

R. Jurdana-Šepić  D. Kotnik-Karuza 《Astrophysics and Space Science》2003,288(3):269-277

The difficulties encountered in attempts to study the spectra of very late stars inspired us to prepare this spectral atlas containing essentially spectral features of M7III stars in the optical spectral region. As representative star we took the cool component of the binary symbiotic CH Cygni during one of its quiescent phases. Total number of 920 atomic lines and molecular bands have been identified with different degrees of reliability. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Detecting X-ray filaments in the low-redshift Universe with XEUS and Constellation-X     

M. Viel  E. Branchini  R. Cen  S. Matarrese  P. Mazzotta  J. P. Ostriker 《Monthly notices of the Royal Astronomical Society》2003,341(3):792-804

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Dark energy effects on the Lyman α forest     

M. Viel  S. Matarrese  Tom Theuns  D. Munshi  Yun Wang 《Monthly notices of the Royal Astronomical Society》2003,340(4):L47-L51

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Origin and Properties of Strong MgII Quasar Absorption Line Systems     

《中国天文和天体物理学报》2001,(1)

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Observational signatures of feedback in QSO absorption spectra     

Tom Theuns  H. J. Mo  Joop Schaye 《Monthly notices of the Royal Astronomical Society》2001,321(3):450-462

Models for the formation of galaxies and clusters of galaxies require strong feedback in order to explain the observed properties of these systems. We investigate whether such feedback has observational consequences for the intergalactic medium, as probed in absorption towards background quasars. A typical quasar sight-line intersects one protocluster per unit redshift, and significant feedback from forming galaxies or active galactic nuclei, heating the protocluster gas, will result in a large clearing of reduced absorption in the Ly α forest. Such a gap could be detected at redshift ≳3 when the mean opacity is high. Feedback from Lyman-break galaxies in protoclusters can be probed by the absorption lines produced in their winds. Strong feedback from galaxies has a major impact on the number and properties of absorption lines with column densities N _{H  i} ∼10¹⁶ cm⁻². This feedback can be probed with multiple sight-lines and by studying the unsaturated higher order lines of the Lyman series. Galactic winds from dwarf galaxies should break up into clouds, in order not to overproduce the number of absorption lines. These clouds can then coast to large distances.  相似文献   

Hydrodynamical simulations of the Lyα forest: data comparisons     

Avery Meiksin  Greg Bryan †  Marie Machacek ‡ 《Monthly notices of the Royal Astronomical Society》2001,327(1):296-322

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Electron attachment to interstellar grains     

D. R. Flower  M. J. Middleton 《Monthly notices of the Royal Astronomical Society》2004,352(3):837-840

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Erratum: Non-Sobolev modelling of radiation-pressure-driven flows in active galactic nuclei     

Doron Chelouche  Hagai Netzer 《Monthly notices of the Royal Astronomical Society》2004,348(1):368-368

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QSO pairsacross active galaxies: Evidence of blueshifts?     

D. Basu 《Journal of Astrophysics and Astronomy》2006,27(4):381-388

Several QSO pairs have been reported and their redshifts determined, where the two objects in each pair are locatedacross an active galaxy. The usually accepted explanation of such occurrences is that the pair is ejected from the parent galaxy. Currently interpreted redshifted spectra for both the QSOs imply that both the objects are receding from the observer. However, ejection can occur towards and away from the observer with equal probability. We argue that for a system with two QSOs lyingacross the parent galaxy, ejection should have occurred in opposite directions, whereby one object will be approaching us and the other will be receding from us. The former would exhibit a blueshifted spectrum. We analyse here a sample of four such pairs and show that the observed spectrum of one QSO in each pair can be interpreted as blueshifted. The other exhibits the usual redshifted spectrum. A scenario based on the ‘sling-shot’ mechanism of ejection is presented to explain the occurrences of the pairs in opposite sides of the active galaxies moving in opposite directions.  相似文献