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The Faint Intergalactic Redshifted Emission Balloon-2: End-to-end ground Calibration

Picouet, Vincent and Milliard, Bruno and Vibert, Didier and Grange, Robert and Martin, Christopher and Hamden, Erika T. and Kyne, Gillian and Schiminovich, David and Augustin, Ramona and Melso, Nicole and Gross, Julia and Quiret, Samuel (2018) The Faint Intergalactic Redshifted Emission Balloon-2: End-to-end ground Calibration. In: Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray. Proceedings of SPIE. No.10699. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 106990L. ISBN 9781510619517.

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The circumgalactic medium (CGM) plays a critical role in the evolution of galaxy discs, as it hosts important mechanisms regulating their replenishment through inflows and outflows. Besides absorption spectroscopy, mapping of the HI Lyα emission of z>2 CGM is bringing a new perspective with a complete 2- or 3-D mapping. Despite this benefit, data in emission are very scarce in the large time span from z∼2 to the present because of the difficulties inherent to vacuum UV observations. The FIREBall-2 (Faint Intergalactic Redshifted Emission Balloon) instrument has been developed to help fill this gap and is scheduled for launch in September 2018. It has been optimized to provide a bi-dimensional (x, λ) map of the extremely faint diffuse Ly-a HI emission in the CGM at z∼0.7 and has the capability to observe ~200 galaxies and a dozen QSOs in a single night flight. Given its wide field of view (FOV) of 20x40 arcmin2, its angular resolution of 6-10 arcsec and spectral resolution above 1000, FIREBall-2 will bring important insights about the gas distribution in the CGM, and the velocity/temperature fields, and has the potential to bring statistical constraints.
The instrument is a balloon-borne 1m telescope coupled to a UV multi-object spectrograph (MOS) designed to image the CGM in emission via specific spectral lines (Lya, CIV, OVI) redshifted in a narrow UV band [1990 - 2130]A for the nearby universe (0.2< z <1). The optical design relies on a 1.2-meter moving siderostat that stabilizes the beam and reflects the light on a fixed paraboloid which in turn images it at the entrance of the payload. This payload is constituted of a focal corrector followed by a slit Multi-Object Spectrograph (reflective 2400 g/mm holographic aspherical grating located between two Schmidt mirrors). The objects selection is achieved with a series of pre-installed precision mask systems that also feed the fine guidance camera. The detector is a e2v electron multiplying CCD coated and delta-doped by the Jet Propulsion Laboratory. FIREBall-2 is funded by CNES and NASA and is developed in cooperation with a Franco-American consortium composed of LAM, CALTECH, Columbia University, JPL and CST-CNES. In this presentation, we describe the final ground calibration of the instrument. We explain what technical specifications ensue from the scientific goals of the mission and we will then highlight why this optical design has been chosen. The calibration of the instrument (alignment - through focus - distortion) will be presented followed by the analysis of the instrument scientific performances. We will then describe the improvement and the calibration of the ZEMAX-coupled instrument model developed at LAM, based on these final performances. This model is finally used to make an end-to-end prediction of the observations of the emission of the CGM from a large halo in a cosmological simulation.

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Martin, Christopher0000-0002-8650-1644
Additional Information:© 2018 Society of Photo-optical Instrumentation Engineers (SPIE).
Series Name:Proceedings of SPIE
Issue or Number:10699
Record Number:CaltechAUTHORS:20180723-155945652
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Official Citation:Vincent Picouet, Bruno Milliard, Didier Vibert, Robert Grange, Christopher Martin, Erika T. Hamden, Gillian Kyne, David Schiminovich, Ramona Augustin, Nicole Melso, Julia Gross, Samuel Quiret, "The Faint Intergalactic Redshifted Emission Balloon-2: End-to-end ground Calibration (Conference Presentation)", Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 106990L (10 July 2018); doi: 10.1117/12.2313324;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88147
Deposited By: Tony Diaz
Deposited On:24 Jul 2018 14:47
Last Modified:16 Nov 2021 00:24

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