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| 題名: | Large Magellanic Cloud Near-Infrared Synoptic Survey - III. a statistical study of non-linearity in the Leavitt Laws |
| 作者: | 饒兆聰;Bhardwaj, Anupam;Kanbur, Shashi M.;Macri, Lucas M.;Singh, Harinder P.;Ngeow, Chow-Choong;Ishida, Emille E. O. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Astronomy;Calibration;Cepheid variables;Galaxies;Luminosity;Magellanic clouds;Metallicity;Nonlinearity;Slopes;Stars & galaxies;Statistical analysis;Supernovae;Wavelengths |
| 日期: | 2016-04-01 |
| 上傳時間: | 2026-04-21 14:50:34 (UTC+8) |
| 出版者: | Oxford University Press;London: Oxford University Press |
| 摘要: | 摘要： We present a detailed statistical analysis of possible non-linearities in the period–luminosity (PL), period–Wesenheit (PW) and period–colour (PC) relations for Cepheid variables in the Large Magellanic Cloud (LMC) at optical (VI) and near-infrared (JHKs ) wavelengths. We test for the presence of possible non-linearities and determine their statistical significance by applying a variety of robust statistical tests (F-test, random-walk, testimator and the Davies test) to optical data from third phase of the Optical Gravitational Lensing Experiment and near-infrared data from Large Magellanic Cloud Near-Infrared Synoptic Survey. For fundamental-mode Cepheids, we find that the optical PL, PW and PC relations are non-linear at 10 d. The near-infrared PL and the $W^H_{V,I}$ relations are non-linear around 18 d; this break is attributed to a distinct variation in mean Fourier amplitude parameters near this period for longer wavelengths as compared to optical bands. The near-infrared PW relations are also non-linear except for the $W_{H,K_s}$ relation. For first-overtone mode Cepheids, a significant change in the slope of PL, PW and PC relations is found around 2.5 d only at optical wavelengths. We determine a global slope of −3.212 ± 0.013 for the $W^H_{V,I}$ relation by combining our LMC data with observations of Cepheids in Supernovae host galaxies. We find this slope to be consistent with the corresponding LMC relation at short periods, and significantly different to the long-period value. We do not find any significant difference in the slope of the global-fit solution using a linear or non-linear LMC PL relation as calibrator, but the linear version provides a two times better constraint on the slope and metallicity coefficient.
出版者： London: Oxford University Press
出版日期： 2016-04-01
出處： Monthly notices of the Royal Astronomical Society, 2016-04, Vol.457 (2), p.1644-1665
資源來源： Alma/SFX Local Collection
版權： 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society 2016
版權： Copyright Oxford University Press, UK Apr 1, 2016
識別號： ISSN: 0035-8711
識別號： ISSN: 1365-8711
識別號： ISSN: 1365-2966
識別號： EISSN: 1365-2966
識別號： DOI: 10.1093/mnras/stw040 |
| 顯示於類別: | [天文研究所] 期刊論文
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