Evolution of the UV upturn in cluster galaxies: Abell 1689
Evolution of the UV upturn in cluster galaxies: Abell 1689
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星团星系中紫外线上升的演化:Abell 1689
DOI:
10.1093/mnras/sty1160
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发表时间:
2018
影响因子:
4.8
通讯作者:
Ali S
中科院分区:
文献类型:
--
作者:
Ali S
We have measured the strength of the UV upturn for red sequence galaxies in the Abell 1689 cluster atz= 0.18, reaching to or below theL* level and therefore probing the general evolution of the upturn phenomenon. We find that the range of UV upturn strengths in the population as a whole has not declined over the past 2.2 Gyr. This is consistent with a model where hot horizontal branch (HB) stars, produced by a Helium-enriched population, provide the required UV flux. Based on local counterparts, this interpretation of the result implies Helium abundances of at least 1.5 times the primordial value for this HB population, along with high formation and assembly redshifts for the galaxies and at least a subset of their stellar populations.
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DOI:
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DOI:
10.1111/j.1365-2966.2011.19859.x
发表时间:
2011-09
影响因子:
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通讯作者:
A. Miglio;K. Brogaard;D. Stello;W. Chaplin;F. D’Antona;J. Montalbán;S. Basu;A. Bressan;A. Bressan;F. Grundahl;M. Pinsonneault;A. Serenelli;Y. Elsworth;S. Hekker;S. Hekker;T. Kallinger;B. Mosser;P. Ventura;A. Bonanno;A. Noels;V. S. Aguirre;R. Szabó;Jie Li;S. McCauliff;C. Middour;H. Kjeldsen