Blue notes of CHaS: an OIII/H-beta channel for the Circumgalactic H-alpha Spectrograph + other instrument upgrades

Meghna Sitaram; David Schiminovich; Ignacio Cevallos-Aleman; Nicole Melso; Bárbara Cruvinel Santiago; Brian Smiley; Skylar Bogdanowitsch; Nazende ipek Kerkeser; Madison Li; Gianni Popko; Mia Yiannias

doi:10.1117/12.3019359

18 July 2024 Blue notes of CHαS: an OIII/Hβ channel for the Circumgalactic Hα Spectrograph + other instrument upgrades

Meghna Sitaram, David Schiminovich, Ignacio Cevallos-Aleman, Nicole Melso, Bárbara Cruvinel Santiago, Brian Smiley, Skylar Bogdanowitsch, Nazende ipek Kerkeser, Madison Li, Gianni Popko, Mia Yiannias

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 1309642 (2024) https://doi.org/10.1117/12.3019359
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The Circumgalactic Hα Spectrograph (CHαS) is a new narrowband integral field spectrograph optimized for observing faint emission from the ionized circumgalactic medium (CGM) of nearby galaxies. CHαS is deployed on the 2.4m Hiltner telescope at MDM Observatory in Arizona, where we are conducting an initial science survey collecting deep spectral imaging of 10 galaxies in Ha emission. Here we debut the commissioning of a blue channel, extending the spectral coverage to include Hβ and OIII emission. We present modeling for new narrowband filters that can tilt in order to center on different wavelengths, expanding our range of observable redshifts while limiting spectral overlap. Finally, we discuss the development of an actuated lenslet array mount to precisely shift the lenslet array across the focal plane, offsetting instrument flexure. CHαS will be an ideal test-bed for new focal plane and detector technologies as we develop it into a facility instrument at MDM Observatory.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Meghna Sitaram, David Schiminovich, Ignacio Cevallos-Aleman, Nicole Melso, Bárbara Cruvinel Santiago, Brian Smiley, Skylar Bogdanowitsch, Nazende ipek Kerkeser, Madison Li, Gianni Popko, and Mia Yiannias "Blue notes of CHαS: an OIII/Hβ channel for the Circumgalactic Hα Spectrograph + other instrument upgrades", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 1309642 (18 July 2024); https://doi.org/10.1117/12.3019359

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