Spectral response of SPHEREx
Abstrak
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.
Topik & Kata Kunci
Penulis (53)
Howard Hui
James J. Bock
Sam Condon
C. D. Dowell
Woong-Seob Jeong
Young-soo Jo
P. Korngut
Kenneth Manatt
Chi H. Nguyen
Hien T. Nguyen
S. Padin
Sung-Joon Park
J. Pyo
Yujin Yang
M. Ashby
Y. P. Bach
Tzu-Ching Chang
Yun-Ting Cheng
Yi-Kuan Chiang
A. Cooray
B. Crill
A. Cukierman
Olivier Dor'e
A. Faisst
Joseph L. Hora
J. Kang
Carey M. Lisse
Daniel C. Masters
R. Paladini
Z. Rustamkulov
V. Tolls
M. Werner
M. A. D. O. Physics
C. I. O. Technology
Jet propulsion Laboratory
D. Physics
S. University
Korea Astronomy
Space Telescope Science Institute
University of Electronic Science
Viet Nam National University
Center for Computational Astrophysics
Harvard-Smithsonian
A. S. I. O. Astronomy
Astrophysics
Astronomy
U. C. Irvine
Ipac
C. I. O. Technology
J. University
Johns Hopkins University Applied Physics Laboratory
S. O. Physics
R. I. O. Technology
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