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| Paper IPM / Astronomy / 18381 |
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Thanks to the multiwavelength data collected in several surveys conducted by TMMT and Spitzer, we can consider the Period-Luminosity (PL) relation from optical to mid-IR. It is evident that as we move to longer wavelengths, the dispersion of PL data decreases, indicating a reduction in statistical errors due to the diminishing effect of temperature. Working in redder wavelengths (near- and mid-IR) provides us with more reliable results, leading to more accurate determinations of H0.
Observations in this range of wavelengths are challenging and often impossible with ground-based telescopes, necessitating space-based telescopes such as JWST. However, these observations are constrained by time limitations due to the many observations they must conduct. This poses a challenge in requiring time-averaged data in subjects like PL relation. This idea emerged from the question: is it possible to derive time-averaged magnitudes from single-epoch observations?
In this project, we aim to discover a relationship to correct random-phase data, resulting in narrower PL data. This method tackles errors originating from the single-epoch observations by utilizing information from observations in another filter, leading to time-averaged data. The technique relies on correlations between residuals from Period-Luminosity (PL) relations and magnitude-magnitude diagrams across various bandpasses, primarily spanning different ranges of wavelengths.
Finally, we selected the J and B bandpasses to calibrate and test our method, with the J bandpass representing the random-phase data component. The findings illustrate that this correction reduces the scatter around the PL fitted line by approximately â2 in the J bandpass, From 0.24 to 0.17 magnitude.
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