Calibrating photometric redshifts with intensity mapping observations
Imaging surveys of galaxies will have a high number density and angular resolution yet a poor redshift precision. Intensity maps of neutral hydrogen will have accurate redshift resolution yet will not resolve individual sources. Using this complementarity, we show how the clustering redshifts approa...
| Main Authors: | , , , |
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| Format: | Journal article |
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American Physical Society
2017
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| _version_ | 1797071511017750528 |
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| author | Alonso, D Ferreira, P Jarvis, M Moodley, K |
| author_facet | Alonso, D Ferreira, P Jarvis, M Moodley, K |
| author_sort | Alonso, D |
| collection | OXFORD |
| description | Imaging surveys of galaxies will have a high number density and angular resolution yet a poor redshift precision. Intensity maps of neutral hydrogen will have accurate redshift resolution yet will not resolve individual sources. Using this complementarity, we show how the clustering redshifts approach proposed for spectroscopic surveys can also be used in combination with intensity mapping observations to calibrate the redshift distribution of galaxies in an imaging survey and, as a result, reduce uncertainties in photometric-redshift measurements. We show how the intensity mapping surveys to be carried out with the MeerKAT, HIRAX and SKA instruments can improve photometric-redshift uncertainties to well below the requirements of DES and LSST. The effectiveness of this method as a function of instrumental parameters, foreground subtraction and other potential systematic errors is discussed in detail. |
| first_indexed | 2024-03-06T22:54:20Z |
| format | Journal article |
| id | oxford-uuid:5fdad5f8-8ded-4543-abfc-9c5b6b8d4440 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T22:54:20Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:5fdad5f8-8ded-4543-abfc-9c5b6b8d44402022-03-26T17:49:45ZCalibrating photometric redshifts with intensity mapping observationsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:5fdad5f8-8ded-4543-abfc-9c5b6b8d4440Symplectic Elements at OxfordAmerican Physical Society2017Alonso, DFerreira, PJarvis, MMoodley, KImaging surveys of galaxies will have a high number density and angular resolution yet a poor redshift precision. Intensity maps of neutral hydrogen will have accurate redshift resolution yet will not resolve individual sources. Using this complementarity, we show how the clustering redshifts approach proposed for spectroscopic surveys can also be used in combination with intensity mapping observations to calibrate the redshift distribution of galaxies in an imaging survey and, as a result, reduce uncertainties in photometric-redshift measurements. We show how the intensity mapping surveys to be carried out with the MeerKAT, HIRAX and SKA instruments can improve photometric-redshift uncertainties to well below the requirements of DES and LSST. The effectiveness of this method as a function of instrumental parameters, foreground subtraction and other potential systematic errors is discussed in detail. |
| spellingShingle | Alonso, D Ferreira, P Jarvis, M Moodley, K Calibrating photometric redshifts with intensity mapping observations |
| title | Calibrating photometric redshifts with intensity mapping observations |
| title_full | Calibrating photometric redshifts with intensity mapping observations |
| title_fullStr | Calibrating photometric redshifts with intensity mapping observations |
| title_full_unstemmed | Calibrating photometric redshifts with intensity mapping observations |
| title_short | Calibrating photometric redshifts with intensity mapping observations |
| title_sort | calibrating photometric redshifts with intensity mapping observations |
| work_keys_str_mv | AT alonsod calibratingphotometricredshiftswithintensitymappingobservations AT ferreirap calibratingphotometricredshiftswithintensitymappingobservations AT jarvism calibratingphotometricredshiftswithintensitymappingobservations AT moodleyk calibratingphotometricredshiftswithintensitymappingobservations |