Over the last 30 years,the Hubble Space Telescope has revolutionized astronomy and awed the public with gorgeous photos of the cosmos.Scientists expect even bigger achievements from Hubble’s successor,the James Webb ...Over the last 30 years,the Hubble Space Telescope has revolutionized astronomy and awed the public with gorgeous photos of the cosmos.Scientists expect even bigger achievements from Hubble’s successor,the James Webb Space Telescope(JWST),which blasted off atop an Ariane 5 rocket from the Guiana Space Center in Kourou,French Guiana,on December 25,2021(Fig.1)[1].展开更多
We compare observed with predicted distributions of galaxy stellar masses M<sub>* </sub>and galaxy rest-frame ultra-violet luminosities per unit bandwidth L<sub>UV</sub>, in the redsh...We compare observed with predicted distributions of galaxy stellar masses M<sub>* </sub>and galaxy rest-frame ultra-violet luminosities per unit bandwidth L<sub>UV</sub>, in the redshift range z=2 to 13. The comparison is presented as a function of the comoving warm dark matter free-streaming cut-off wavenumber k<sub>fs</sub>. For this comparison the theory is a minimal extension of the Press-Schechter formalism with only two parameters: the star formation efficiency, and a proportionality factor between the star formation rate per galaxy and LUV</sub>. These two parameters are fixed to their values obtained prior to the James Webb Space Telescope (JWST) data. The purpose of this comparison is to identify if, and where, detailed astrophysical evolution is needed to account for the new JWST observations.展开更多
As Hubble’s successor,it will look deeper into the past than ever before The James Webb Space Telescope(JWST),the world’s largest and most powerful space science observatory,lifted off aboard an Ariane 5 rocket from...As Hubble’s successor,it will look deeper into the past than ever before The James Webb Space Telescope(JWST),the world’s largest and most powerful space science observatory,lifted off aboard an Ariane 5 rocket from Kourou,French Guiana at 9:20 a.m.local time on December 25,2021.The$10-billion mission will enable scientists to look at the oldest stars and galaxies to better understand cosmic history and search for evidence of life outside our solar system,among other goals.展开更多
The chemical constituents of the fatty oil from seeds of Descurainia sophia(L.) Webb ex Prantl were analyzed by GC-MS.The results showed that thirty-four compounds were isolated and identified,representing 97.259% of ...The chemical constituents of the fatty oil from seeds of Descurainia sophia(L.) Webb ex Prantl were analyzed by GC-MS.The results showed that thirty-four compounds were isolated and identified,representing 97.259% of the total fatty oil.The main constituents of oil were unsaturated fatty acids(31.745%),unsaturated fatty acid esters(38.631%) and saturated fatty acid esters(12.285%).The main compounds with contents over 10%(V/V) followed as: 9,12,15-calendic acid-2,3-dihydroxypropyl ester(14.763%),(9Z,12Z,15Z)-calendic acid ethyl ester(14.723%) and(Z,Z)-9,12-octadecadienoic acid(13.073%).展开更多
文摘Over the last 30 years,the Hubble Space Telescope has revolutionized astronomy and awed the public with gorgeous photos of the cosmos.Scientists expect even bigger achievements from Hubble’s successor,the James Webb Space Telescope(JWST),which blasted off atop an Ariane 5 rocket from the Guiana Space Center in Kourou,French Guiana,on December 25,2021(Fig.1)[1].
文摘We compare observed with predicted distributions of galaxy stellar masses M<sub>* </sub>and galaxy rest-frame ultra-violet luminosities per unit bandwidth L<sub>UV</sub>, in the redshift range z=2 to 13. The comparison is presented as a function of the comoving warm dark matter free-streaming cut-off wavenumber k<sub>fs</sub>. For this comparison the theory is a minimal extension of the Press-Schechter formalism with only two parameters: the star formation efficiency, and a proportionality factor between the star formation rate per galaxy and LUV</sub>. These two parameters are fixed to their values obtained prior to the James Webb Space Telescope (JWST) data. The purpose of this comparison is to identify if, and where, detailed astrophysical evolution is needed to account for the new JWST observations.
文摘As Hubble’s successor,it will look deeper into the past than ever before The James Webb Space Telescope(JWST),the world’s largest and most powerful space science observatory,lifted off aboard an Ariane 5 rocket from Kourou,French Guiana at 9:20 a.m.local time on December 25,2021.The$10-billion mission will enable scientists to look at the oldest stars and galaxies to better understand cosmic history and search for evidence of life outside our solar system,among other goals.
文摘The chemical constituents of the fatty oil from seeds of Descurainia sophia(L.) Webb ex Prantl were analyzed by GC-MS.The results showed that thirty-four compounds were isolated and identified,representing 97.259% of the total fatty oil.The main constituents of oil were unsaturated fatty acids(31.745%),unsaturated fatty acid esters(38.631%) and saturated fatty acid esters(12.285%).The main compounds with contents over 10%(V/V) followed as: 9,12,15-calendic acid-2,3-dihydroxypropyl ester(14.763%),(9Z,12Z,15Z)-calendic acid ethyl ester(14.723%) and(Z,Z)-9,12-octadecadienoic acid(13.073%).
