Spectral response of SPHEREx
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2026
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| author | Hui, Howard Bock, Jamie Condon, Samuel Dowell, C. Darren Jeong, Woong-Seob Jo, Young-soo Korngut, Phil Manatt, Kenneth Nguyen, Chi Nguyen, Hien Padin, Stephen Park, Sung-Joon Pyo, Jeonghyun Yang, Yujin Ashby, Matt Bach, Yoonsoo Chang, Tzu-Ching Cheng, Yun-Ting Chiang, Yi-Kuan Cooray, Asantha Crill, Brendan Cukierman, Ari Doré, Olivier Faisst, Andreas Hora, Joe Kang, Jae Hwan Lee, BoMee Lisse, Carey Masters, Dan Paladini, Roberta Rustamkulov, Zafar Tolls, Volker Werner, Michael Zemcov, Mike |
| author_facet | Hui, Howard Bock, Jamie Condon, Samuel Dowell, C. Darren Jeong, Woong-Seob Jo, Young-soo Korngut, Phil Manatt, Kenneth Nguyen, Chi Nguyen, Hien Padin, Stephen Park, Sung-Joon Pyo, Jeonghyun Yang, Yujin Ashby, Matt Bach, Yoonsoo Chang, Tzu-Ching Cheng, Yun-Ting Chiang, Yi-Kuan Cooray, Asantha Crill, Brendan Cukierman, Ari Doré, Olivier Faisst, Andreas Hora, Joe Kang, Jae Hwan Lee, BoMee Lisse, Carey Masters, Dan Paladini, Roberta Rustamkulov, Zafar Tolls, Volker Werner, Michael Zemcov, Mike |
| contents | The Spectro Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer (SPHEREx) is conducting the first all-sky near infrared spectral survey spanning 0.75 to 5.0um with resolving power R~35 to 130. Linear variable filters mounted in front of six H2RG detectors produce a position dependent spectral response across the focal plane.
This paper presents the ground-based spectral calibration of SPHEREx, including the cryogenic apparatus, optical configuration, measurement strategy, analysis pipeline, and resulting calibration products. Monochromatic wavelength scans are used to derive the spectral response function, band center, and resolving power for every pixel. Band centers are measured to better than 1nm for Bands 1 through 4 (0.75 to 3.82um) and better than 10nm for Bands 5 and 6 (3.82 to 5.0um). Out-of-band leakage is negligible for detectors above 1.64um and is present at the percent level below this wavelength. The resolving power is measured to within 5% and agrees with design expectations to within 10%.
An on-sky spectrum of the Cat's Eye Nebula (NGC 6543) constructed from repeated observations provides in-flight verification and shows agreement between ground calibrated response and astrophysical emission features. Calibration products, including per-pixel band center and resolving power maps, are released through IPAC to support community use of SPHEREx data. The absolute spectral calibration will continue to improve through in-flight measurements, with further reductions in uncertainty expected for the longest-wavelength bands. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_09139 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spectral response of SPHEREx Hui, Howard Bock, Jamie Condon, Samuel Dowell, C. Darren Jeong, Woong-Seob Jo, Young-soo Korngut, Phil Manatt, Kenneth Nguyen, Chi Nguyen, Hien Padin, Stephen Park, Sung-Joon Pyo, Jeonghyun Yang, Yujin Ashby, Matt Bach, Yoonsoo Chang, Tzu-Ching Cheng, Yun-Ting Chiang, Yi-Kuan Cooray, Asantha Crill, Brendan Cukierman, Ari Doré, Olivier Faisst, Andreas Hora, Joe Kang, Jae Hwan Lee, BoMee Lisse, Carey Masters, Dan Paladini, Roberta Rustamkulov, Zafar Tolls, Volker Werner, Michael Zemcov, Mike Instrumentation and Methods for Astrophysics The Spectro Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer (SPHEREx) is conducting the first all-sky near infrared spectral survey spanning 0.75 to 5.0um with resolving power R~35 to 130. Linear variable filters mounted in front of six H2RG detectors produce a position dependent spectral response across the focal plane. This paper presents the ground-based spectral calibration of SPHEREx, including the cryogenic apparatus, optical configuration, measurement strategy, analysis pipeline, and resulting calibration products. Monochromatic wavelength scans are used to derive the spectral response function, band center, and resolving power for every pixel. Band centers are measured to better than 1nm for Bands 1 through 4 (0.75 to 3.82um) and better than 10nm for Bands 5 and 6 (3.82 to 5.0um). Out-of-band leakage is negligible for detectors above 1.64um and is present at the percent level below this wavelength. The resolving power is measured to within 5% and agrees with design expectations to within 10%. An on-sky spectrum of the Cat's Eye Nebula (NGC 6543) constructed from repeated observations provides in-flight verification and shows agreement between ground calibrated response and astrophysical emission features. Calibration products, including per-pixel band center and resolving power maps, are released through IPAC to support community use of SPHEREx data. The absolute spectral calibration will continue to improve through in-flight measurements, with further reductions in uncertainty expected for the longest-wavelength bands. |
| title | Spectral response of SPHEREx |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2602.09139 |