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Mark Dickinson(Mark Dickinson ) 한국캐나다학회 2011 Asia-Pacific Journal of Canadian Studies (APJCS) Vol.17 No.1
In his groundbreaking book A Fair Country: Telling Truths About Canada (2008), public intellectual John Ralston Saul argues that the senior founding pillar of contemporary Canadian civilization is the persistent influence of Aboriginal ideas and customs on non-Aboriginal culture. Saul places an emphasis on the Aboriginal concept of the ever-enlarging circle, an ethical pact of fairness and equality, as a defining factor in ideas of modern Canadian nationhood. I illuminate Saul’s argument by bringing it into conversation with one of the most unusual long poems in Canadian literature, Robert Bringhurst’s polyphonic masque Ursa Major (2003/2009). Ursa Major, composed in four languages (Cree, Greek, Latin and English) integrates Ovid’s myth of Callisto and Arcturus, with “Bear Woman” by the Sweet Grass Cree mythteller Kâ-kîsikâw-pîhtokêw. It is Bringhurst’s re-imagined Arcturus, transplanted to the Saskatchewan prairie, who enacts the ever-enlarging circle, demonstrating that the only fair country is one that exists in a state of continuous negotiation and open-heartedness with that which it is not.
Valentino, Francesco,Daddi, Emanuele,Finoguenov, Alexis,Strazzullo, Veronica,Brun, Amandine Le,Vignali, Cristian,Bournaud, Fré,dé,ric,Dickinson, Mark,Renzini, Alvio,Bé,thermin, Matth American Astronomical Society 2016 The Astrophysical journal Vol.829 No.1
<P>We present the discovery of a giant >= 100 kpc Ly alpha nebula detected in the core of the X-ray emitting cluster CL J1449 +0856 at z = 1.99 through Keck/LRIS narrow-band imaging. This detection extends the known relation between Lya nebulae and overdense regions of the universe to the dense core of a 5-7 x 10(13) M-circle dot cluster. The most plausible candidates to power the nebula are two Chandra-detected AGN host cluster members, while cooling from the X-ray phase and cosmological cold flows are disfavored primarily because of the high Ly alpha to X-ray luminosity ratio (L-Ly alpha/L-X approximate to 0.3, greater than or similar to 10-1000 times. higher than in local cool-core clusters) and by current modeling. Given the physical conditions of the Ly alpha-emitting gas and the possible interplay with the X-ray phase, we argue that the Ly alpha nebula would be short-lived (less than or similar to 10 Myr) if not continuously replenished with cold gas at a rate of greater than or similar to 1000 M-circle dot yr(-1). We investigate the possibility that cluster galaxies supply the required gas through outflows and we show that their total mass outflow rate matches the replenishment necessary to sustain the nebula. This scenario directly implies the extraction of energy from galaxies and its deposition in the surrounding intracluster medium (ICM), as required to explain the thermodynamic properties of local clusters. We estimate an energy injection of the order of approximate to 2 keV per particle in the ICM over a 2 Gyr interval. In our baseline calculation, AGNs provide up to 85% of the injected energy and two-thirds. of the mass, while the rest is supplied by supernovae-driven winds.</P>
TIDAL DWARF GALAXIES AROUND A POST-MERGER GALAXY, NGC 4922
Sheen, Yun-Kyeong,Jeong, Hyunjin,Yi, Sukyoung K.,Ferreras, Ignacio,Lotz, Jennifer M.,Olsen, Knut A. G.,Dickinson, Mark,Barnes, Sydney,Park, Jang-Hyun,Ree, Chang H.,Madore, Barry F.,Barlow, Tom A.,Conr American Institute of Physics 2009 The Astronomical journal Vol.138 No.6
<P>One possible channel for the formation of dwarf galaxies involves birth in the tidal tails of interacting galaxies. We report the detection of a bright UV tidal tail and several young tidal dwarf galaxy (TDG) candidates in the post-merger galaxy NGC 4922 in the Coma cluster. Based on a two-component population model (combining young and old stellar populations), we find that the light of tidal tail predominantly comes from young stars (a few Myr old). The Galaxy Evolution Explorer ultraviolet data played a critical role in the parameter (age and mass) estimation. Our stellar mass estimates of the TDG candidates are ~10<SUP>6–7</SUP> M<SUB>☉</SUB>, typical for dwarf galaxies.</P>
Tidal Dwarf Galaxies around a Post-Merger Galaxy, NGC 4922
Sheen, Yun-Kyeong,Jeong, Hyun-Jin,Yi, Suk-Young K,Ferreras, Ignacio,Lotz, Jennifer M.,Olsen, Knut A.G.,Dickinson, Mark,Barnes, Sydney,Lee, Young-Wook,Park, Jang-Hyun,Ree, Chang-H. 한국우주과학회 2009 한국우주과학회보 Vol.18 No.2
One possible channel for the formation of dwarf galaxies involves birth in the tidal tails of interacting galaxies. We report the detection of a bright UV tidal tail and several young tidal dwarf galaxy candidates in the post-merger galaxy NGC 4922 in the
Song, Mimi,Finkelstein, Steven L.,Ashby, Matthew L. N.,Grazian, A.,Lu, Yu,Papovich, Casey,Salmon, Brett,Somerville, Rachel S.,Dickinson, Mark,Duncan, K.,Faber, Sandy M.,Fazio, Giovanni G.,Ferguson, He American Astronomical Society 2016 The Astrophysical Journal Vol.825 No.1
<P>We present galaxy stellar mass functions (GSMFs) at z = 4-8 from a rest-frame ultraviolet (UV) selected sample of similar to 4500 galaxies, found via photometric redshifts over an area of similar to 280 arcmin(2) in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS)/Great Observatories Origins Deep Survey (GOODS) fields and the Hubble Ultra Deep Field. The deepest Spitzer/IRAC data to date and the relatively large volume allow us to place a better constraint at both the low- and high-mass ends of the GSMFs compared to previous space-based studies from pre-CANDELS observations. Supplemented by a stacking analysis, we find a linear correlation between the rest-frame UV absolute magnitude at 1500 angstrom (M-UV) and logarithmic stellar mass (log M-*) that holds for galaxies with log(M-*/M-circle dot) less than or similar to 10. We use simulations to validate our method of measuring the slope of the log M-*-M-UV relation, finding that the bias is minimized with a hybrid technique combining photometry of individual bright galaxies with stacked photometry for faint galaxies. The resultant measured slopes do not significantly evolve over z = 4-8, while the normalization of the trend exhibits a weak evolution toward lower masses at higher redshift. We combine the log M-*-M-UV distribution with observed rest-frame UV luminosity functions at each redshift to derive the GSMFs, finding that the low-mass-end slope becomes steeper with increasing redshift from alpha = -1.55(-0.07)(+0.08) at z = 4 to alpha = -2.25(-0.35)(+0.72) at z = 8. The inferred stellar mass density, when integrated over M-* = 10(8)-10(13) M-circle dot, increases by a factor of 10(-2)(+30) between z = 7 and z = 4 and is in good agreement with the time integral of the cosmic star formation rate density.</P>