Growth-rate measurement with type-Ia supernovae using ZTF survey simulations
Measurements of the growth rate of structures at z < 0.1 with peculiar velocity surveys have the potential of testing the validity of general relativity on cosmic scales. In this work, we present growth-rate measurements from realistic simulated sets of type-Ia supernovae (SNe Ia) from the Zwick...
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Published in | Astronomy and astrophysics (Berlin) Vol. 674; p. A197 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.06.2023
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Subjects | |
Online Access | Get full text |
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Summary: | Measurements of the growth rate of structures at
z
< 0.1 with peculiar velocity surveys have the potential of testing the validity of general relativity on cosmic scales. In this work, we present growth-rate measurements from realistic simulated sets of type-Ia supernovae (SNe Ia) from the Zwicky Transient Facility (ZTF). We describe our simulation methodology, the light-curve fitting, and peculiar velocity estimation. Using the maximum likelihood method, we derived constraints on
fσ
8
using only ZTF SN Ia peculiar velocities. We carefully tested the method and we quantified biases due to selection effects (photometric detection, spectroscopic follow-up for typing) on several independent realizations. We simulated the equivalent of 6 years of ZTF data, and considering an unbiased spectroscopically typed sample at
z
< 0.06, we obtained unbiased estimates of
fσ
8
with an average uncertainty of 19% precision. We also investigated the information gain in applying bias correction methods. Our results validate our framework, which can be used on real ZTF data. |
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ISSN: | 0004-6361 1432-0746 1432-0746 |
DOI: | 10.1051/0004-6361/202346173 |