A Study on the Universality and Linearity of the Leavitt Law in the LMC and SMC Galaxies

Дата и время публикации : 2013-03-04T19:59:18Z

Авторы публикации и институты :
Alejandro García-Varela
Beatriz Sabogal
María Ramírez-Tannus

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 8 pages, 3 figures. Accepted for publication in MNRAS
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR, astro-ph.GA

Краткий обзор статьи: The universality and linearity of the Leavitt law are hypotheses commonly adopted in studies of galaxy distances using Cepheid variables as standard candles. In order to test these hypotheses, we obtain slopes of the Leavitt law using linear regressions of fundamental-mode Cepheids observed by the Optical Gravitational Lensing Experiment project in the Magellanic Clouds. We find that the slopes in $VI$-bands and in the Wesenheit index behave exponentially, indicating non-linearity. We also find that the slopes obtained using long-period Cepheids can be considered as universal in the $VI$-bands, but not in the Wesenheit index.

Category: Physics