Redshift Accuracy Requirements for Future Supernova and Number Count Surveys
We investigate the required redshift accuracy of type Ia supernova and cluster number-count surveys in order for the redshift uncertainties not to contribute appreciably to the dark energy parameter error budget. For the SNAP supernova experiment, we find that, without the assistance of ground-based...
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ftdatacite:10.48550/arxiv.astro-ph/0402002 2023-05-15T18:22:52+02:00 Redshift Accuracy Requirements for Future Supernova and Number Count Surveys Huterer, Dragan Kim, Alex Krauss, Lawrence M. Broderick, Tamara 2004 https://dx.doi.org/10.48550/arxiv.astro-ph/0402002 https://arxiv.org/abs/astro-ph/0402002 unknown arXiv https://dx.doi.org/10.1086/424726 Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004 http://arxiv.org/licenses/assumed-1991-2003/ Astrophysics astro-ph FOS Physical sciences article-journal Article ScholarlyArticle Text 2004 ftdatacite https://doi.org/10.48550/arxiv.astro-ph/0402002 https://doi.org/10.1086/424726 2022-04-01T16:33:59Z We investigate the required redshift accuracy of type Ia supernova and cluster number-count surveys in order for the redshift uncertainties not to contribute appreciably to the dark energy parameter error budget. For the SNAP supernova experiment, we find that, without the assistance of ground-based measurements, individual supernova redshifts would need to be determined to about 0.002 or better, which is a challenging but feasible requirement for a low-resolution spectrograph. However, we find that accurate redshifts for z<0.1 supernovae, obtained with ground-based experiments, are sufficient to immunize the results against even relatively large redshift errors at high z. For the future cluster number-count surveys such as the South Pole Telescope, Planck or DUET, we find that the purely statistical error in photometric redshift is less important, and that the irreducible, systematic bias in redshift drives the requirements. The redshift bias will have to be kept below 0.001-0.005 per redshift bin (which is determined by the filter set), depending on the sky coverage and details of the definition of the minimal mass of the survey. Furthermore, we find that X-ray surveys have a more stringent required redshift accuracy than Sunyaev-Zeldovich (SZ) effect surveys since they use a shorter lever arm in redshift; conversely, SZ surveys benefit from their high redshift reach only so long as some redshift information is available for distant (z>1) clusters. : Submitted to ApJ. Gaussianity assumption for observables fully justified. Photo-z's for SNe discussed Text South pole DataCite Metadata Store (German National Library of Science and Technology) Lever ENVELOPE(-63.608,-63.608,-65.506,-65.506) South Pole |
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Astrophysics astro-ph FOS Physical sciences |
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Astrophysics astro-ph FOS Physical sciences Huterer, Dragan Kim, Alex Krauss, Lawrence M. Broderick, Tamara Redshift Accuracy Requirements for Future Supernova and Number Count Surveys |
topic_facet |
Astrophysics astro-ph FOS Physical sciences |
description |
We investigate the required redshift accuracy of type Ia supernova and cluster number-count surveys in order for the redshift uncertainties not to contribute appreciably to the dark energy parameter error budget. For the SNAP supernova experiment, we find that, without the assistance of ground-based measurements, individual supernova redshifts would need to be determined to about 0.002 or better, which is a challenging but feasible requirement for a low-resolution spectrograph. However, we find that accurate redshifts for z<0.1 supernovae, obtained with ground-based experiments, are sufficient to immunize the results against even relatively large redshift errors at high z. For the future cluster number-count surveys such as the South Pole Telescope, Planck or DUET, we find that the purely statistical error in photometric redshift is less important, and that the irreducible, systematic bias in redshift drives the requirements. The redshift bias will have to be kept below 0.001-0.005 per redshift bin (which is determined by the filter set), depending on the sky coverage and details of the definition of the minimal mass of the survey. Furthermore, we find that X-ray surveys have a more stringent required redshift accuracy than Sunyaev-Zeldovich (SZ) effect surveys since they use a shorter lever arm in redshift; conversely, SZ surveys benefit from their high redshift reach only so long as some redshift information is available for distant (z>1) clusters. : Submitted to ApJ. Gaussianity assumption for observables fully justified. Photo-z's for SNe discussed |
format |
Text |
author |
Huterer, Dragan Kim, Alex Krauss, Lawrence M. Broderick, Tamara |
author_facet |
Huterer, Dragan Kim, Alex Krauss, Lawrence M. Broderick, Tamara |
author_sort |
Huterer, Dragan |
title |
Redshift Accuracy Requirements for Future Supernova and Number Count Surveys |
title_short |
Redshift Accuracy Requirements for Future Supernova and Number Count Surveys |
title_full |
Redshift Accuracy Requirements for Future Supernova and Number Count Surveys |
title_fullStr |
Redshift Accuracy Requirements for Future Supernova and Number Count Surveys |
title_full_unstemmed |
Redshift Accuracy Requirements for Future Supernova and Number Count Surveys |
title_sort |
redshift accuracy requirements for future supernova and number count surveys |
publisher |
arXiv |
publishDate |
2004 |
url |
https://dx.doi.org/10.48550/arxiv.astro-ph/0402002 https://arxiv.org/abs/astro-ph/0402002 |
long_lat |
ENVELOPE(-63.608,-63.608,-65.506,-65.506) |
geographic |
Lever South Pole |
geographic_facet |
Lever South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1086/424726 |
op_rights |
Assumed arXiv.org perpetual, non-exclusive license to distribute this article for submissions made before January 2004 http://arxiv.org/licenses/assumed-1991-2003/ |
op_doi |
https://doi.org/10.48550/arxiv.astro-ph/0402002 https://doi.org/10.1086/424726 |
_version_ |
1766202292351008768 |