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DEMOGRAPHICS OF SLOAN DIGITAL SKY SURVEY GALAXIES ALONG THE HUBBLE SEQUENCE
Oh, Kyuseok,Choi, Hyunseop,Kim, Hong-Geun,Moon, Jun-Sung,Yi, Sukyoung K. American Institute of Physics 2013 The Astronomical journal Vol.146 No.6
<P>We present the statistical properties of a volume-limited sample of 7429 nearby (z = 0.033-0.044) galaxies from the Sloan Digital Sky Survey Data Release 7. Our database includes morphology distribution as well as the structural and spectroscopic properties of each morphology type based on the recent remeasurements of spectral line strengths by Oh and collaborators. Our database does not include galaxies that are apparently smaller and flatter because morphology classification of them turned out to be difficult. Our statistics confirmed the up-to-date knowledge of galaxy populations, e.g., correlations between morphology and line strengths as well as the derived ages. We hope that this database will be useful as a reference.</P>
( Seong Y. Oh ),( Seon A. Lee ),( Jong-ho Park ),( Myungho Lee ),( Kyuseok Song ) 한국질량분석학회 2012 Mass spectrometry letters Vol.3 No.2
Mass spectrometric analysis was carried out using multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) for the precise and accurate determination of the isotope ratios of ultratrace levels of uranium dissolved in 3% HNO3. We used the certified reference material (CRM) 112-A at a trace level of 100 pg/mL for the uranium isotopic measurement. Multiple collectors were utilized for the simultaneous measurement of uranium isotopes to reduce the signal uncertainty due to variations in the ion beam intensity over time. Mass bias correction was applied to the measured U isotopes to improve the precision and accuracy. Furthermore, elemental standard solution with certified values of platinum, iridium, gold, and thallium dissolved in 3% HNO3 were analyzed to investigate the formation rates of the polyatomic ions of Ir40Ar+, Pt40Ar+, Tl40Ar+, Au40Ar+ for the concentration range of 50-400 pg/mL. Those polyatomic ions have mass-to-charge ratios in the 230-245 m/z region that it would contribute to the increase of background intensity of uranium, thorium, plutonium, and americium isotopes. The effect of the polyatomic ion interference on uranium isotope measurement has been estimated.