Optimizing Roman's High Latitude Wide Area Survey for Low Surface Brightness Astronomy

Mireia Montes; Francesca Annibali; Michele Bellazzini; Alejandro S. Borlaff; Sarah Brough; Fernando Buitrago; Nushkia Chamba; Chris Collins; Ian Dell'Antonio; Ivanna Escala; Anthony H. Gonzalez; Benne Holwerda; Sugata Kaviraj; Johan Knapen; Anton Koekemoer; Seppo Laine; Pamela Marcum; Garreth Martin; David Martinez-Delgado; Chris Mihos; Massimo Ricotti; Ignacio Trujillo; Aaron E. Watkins

arXiv · 2306.09414

Optimizing Roman's High Latitude Wide Area Survey for Low Surface Brightness Astronomy

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Abstract

One of the last remaining frontiers in optical/near-infrared observational astronomy is the low surface brightness regime (LSB, V-band surface brightness, $\mu_V>$ 27 AB mag/arcsec$^2$). These are the structures at very low stellar surface densities, largely unseen by even current wide-field surveys such as the Legacy Survey. Studying this domain promises to be transformative for our understanding of star formation in low-mass galaxies, the hierarchical assembly of galaxies and galaxy clusters, and the nature of dark matter. It is thus essential to reach depths beyond $\mu_V$ = 30 AB mag/arcsec$^2$ to detect the faintest extragalactic sources, such as dwarf galaxies and the stellar halos around galaxies and within galaxy clusters. The High Latitude Wide Area Survey offers a unique opportunity to statistically study the LSB universe at unprecedented depths in the IR over an area of $\sim$2000 square degrees. The high spatial resolution will minimize source confusion, allowing an unbiased characterization of LSB structures, including the identification of stars in nearby LSB galaxies and globular clusters. In addition, the combination of Roman with other upcoming deep imaging observatories (such as Rubin) will provide multi-wavelength coverage to derive photometric redshifts and infer the stellar populations of LSB objects.

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Mireia Montes, Francesca Annibali, Michele Bellazzini, Alejandro S. Borlaff, Sarah Brough, Fernando Buitrago, Nushkia Chamba, Chris Collins, Ian Dell'Antonio, Ivanna Escala, Anthony H. Gonzalez, Benne Holwerda, Sugata Kaviraj, Johan Knapen, Anton Koekemoer, Seppo Laine, Pamela Marcum, Garreth Martin, David Martinez-Delgado, Chris Mihos, Massimo Ricotti, Ignacio Trujillo, Aaron E. Watkins. 2023-06-15. Optimizing Roman's High Latitude Wide Area Survey for Low Surface Brightness Astronomy. https://arxiv.org/abs/2306.09414

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