Constraining ultraviolet emission with the upcoming ULTRASAT satellite
arXiv:2401.12285 · doi:10.1051/0004-6361/202449364
Abstract
The Extragalactic Background Light (EBL) carries a huge astrophysical and cosmological content: its frequency spectrum and redshift evolution are determined by the integrated emission of unresolved sources, these being galaxies, active galactic nuclei, or more exotic components. The near-UV region of the EBL spectrum is currently not well constrained, yet a significant improvement can be expected thanks to the soon-to-be launched Ultraviolet Transient Astronomy Satellite (ULTRASAT). Intended to study transient events in the observed band, this detector will provide wide field maps, tracing the UV intensity fluctuations on the largest scales. In this paper, we suggest how to exploit ULTRASAT to reconstruct the redshift evolution of the UV-EBL volume emissivity. We build upon the work of Chiang et al. (2019), where the Clustering-Based Redshift (CBR) technique was used to study diffuse light maps from GALEX. Their results showed the capability of the cross correlation between GALEX and SDSS spectroscopic catalogs in constraining the UV emissivity, highlighting how CBR is sensitive only to the extragalactic emissions, avoiding foregrounds and Galactic contributions. In our analysis, we introduce a framework to forecast the CBR constraining power when applied to ULTRASAT and GALEX in cross correlation with the 5-year DESI spectroscopic survey. We show that these will yield a strong improvement in the measurement of the UV-EBL volume emissivity. For ,non-ionizing continuum below , we forecast a uncertainty with conservative (optimistic) bias priors using ULTRASAT full-sky map; similar constraints can be obtained from its low-cadence survey, which will provide a smaller but deeper map. We finally discuss how these results will foster our understanding of UV-EBL models.
Wrt v1: we updated noise modeling and discussion; account for ULTRASAT low cadence survey. 16 pages, 5 figures
References in corpus (21)
- Cosmic Star Formation History
- An Observational Determination of the Bolometric Quasar Luminosity Function
- Multi-Wavelength Constraints on the Cosmic Star Formation History from Spectroscopy: the Rest-Frame UV, H-alpha, and Infrared Luminosity Functions at Redshifts 1.9<z<3.4
- HMcode-2020: Improved modelling of non-linear cosmological power spectra with baryonic feedback
- Calibrating Redshift Distributions Beyond Spectroscopic Limits with Cross-Correlations
- The Low-Redshift Lyman Continuum Survey I: New, Diverse Local Lyman-Continuum Emitters
- Evolution of the Luminosity Function, Star Formation Rate, Morphology and Size of Star-forming Galaxies Selected at Rest-frame 1500A and 2800A
- Line-Intensity Mapping: Theory Review
- The-wiZZ: Clustering redshift estimation for everyone
- Clustering-based Redshift Estimation: Comparison to Spectroscopic Redshifts
- Inferring the Redshift Distribution of the Cosmic Infrared Background
- Mapping the Diffuse Ultraviolet Sky with GALEX
- Probing the Blue Axion with Cosmic Optical Background Anisotropies
- Strategies to Detect Dark-Matter Decays with Line-Intensity Mapping
- The Mystery of the Cosmic Diffuse Ultraviolet Background Radiation
- A Measurement of the Cosmic Optical Background and Diffuse Galactic Light Scaling from the R < 50 AU New Horizons-LORRI Data
- Gravitational waves HI intensity mapping: cosmological and astrophysical applications
- Cosmic Near-infrared Background Tomography with SPHEREx Using Galaxy Cross-correlations
- Probing bursty star formation by cross-correlating extragalactic background light and galaxy surveys
- Galaxy Cluster Contribution to the Diffuse Extragalactic Ultraviolet Background
- Forecasts for Broadband Intensity Mapping of the Ultraviolet-Optical Background with CASTOR and SPHEREx