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The multiple merger assembly of a hyperluminous obscured quasar at redshift 4.6
Dí,az-Santos, T.,Assef, R. J.,Blain, A. W.,Aravena, M.,Stern, D.,Tsai, C.-W.,Eisenhardt, P.,Wu, J.,Jun, H. D.,Dibert, K.,Inami, H.,Lansbury, G.,Leclercq, F. American Association for the Advancement of Scienc 2018 Science Vol.362 No.6418
<P><B>Mergers drive a powerful dusty quasar</B></P><P>Massive galaxies in the early Universe host supermassive black holes at their centers. When material falls toward the black hole, it releases energy and is observed as a quasar. Astronomers found a population of powerful distant quasars that are obscured by dust, but it has been unclear how they are formed. Díaz-Santos <I>et al.</I> observed the dust-obscured quasar WISE J224607.56-052634.9 at submillimeter wavelengths, finding three small companion galaxies connected to the quasar by bridges of gas and dust. They inferred that galaxy mergers can provide both the raw material to power a quasar and large quantities of dust to obscure it.</P><P><I>Science</I>, this issue p. 1034</P><P>Galaxy mergers and gas accretion from the cosmic web drove the growth of galaxies and their central black holes at early epochs. We report spectroscopic imaging of a multiple merger event in the most luminous known galaxy, WISE J224607.56−052634.9 (W2246−0526), a dust-obscured quasar at redshift 4.6, 1.3 billion years after the Big Bang. Far-infrared dust continuum observations show three galaxy companions around W2246−0526 with disturbed morphologies, connected by streams of dust likely produced by the dynamical interaction. The detection of tidal dusty bridges shows that W2246−0526 is accreting its neighbors, suggesting that merger activity may be a dominant mechanism through which the most luminous galaxies simultaneously obscure and feed their central supermassive black holes.</P>
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Role of Ring <i>Ortho</i> Substituents on the Configuration of Carotenoid Polyene Chains
Kim, Minsoo,Jung, Hyunuk,Aragonè,s, Albert C.,Dí,ez-Pé,rez, Ismael,Ahn, Kwang-Hyun,Chung, Wook-Jin,Kim, Dahye,Koo, Sangho American Chemical Society 2018 ORGANIC LETTERS Vol.20 No.2
<P>The 9-(<I>Z</I>)-configuration was exclusively obtained in the carotenoid polyene chain irrespective of olefination and disconnection methods for terminal <I>ortho</I>-unsubstituted benzene rings. The 2,6-dimethyl substituents in the terminal rings secure an all-(<I>E</I>)-polyene structure. The single molecular conductance of the pure 9-(<I>Z</I>)-carotene was measured for the first time to be 1.53 × 10<SUP>–4</SUP> ± 6.37 × 10<SUP>–5</SUP>G<SUB>0</SUB>, whose value was 47% that of the all-(<I>E</I>)-carotene ((3.23 × 10<SUP>–4</SUP>) ± (1.23 × 10<SUP>–4</SUP>) G<SUB>0</SUB>).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2018/orlef7.2018.20.issue-2/acs.orglett.7b03930/production/images/medium/ol-2017-03930m_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol7b03930'>ACS Electronic Supporting Info</A></P>
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