Abstract
We describe a simulation for the distribution of galaxies focusing on the atomic hydrogen content. Our aim is to make predictions for surveys of galaxies using the redshifted 21-cm line emission. We take the expected distribution of HI masses, circular velocities, sizes of galaxies and orientations into account for this simulation. We use the sensitivity of ASKAP and MeerKAT radio telescopes to estimate the number of detections of HI galaxies in upcoming surveys. We validate our simulation with earlier estimates carried out by using some of these considerations. We show that unlike earlier simulations that take some of the factors into account, the predicted number of galaxies and their distribution across masses changes significantly when all these are accounted for. We describe our predictions for the MIGHTEE-HI and WALLABY surveys for blind detection of galaxies using the redshifted 21-cm radiation. We study the dependence of the predicted number of detections on the HI mass function. We also describe our future plans to improve the simulation.
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Acknowledgements
The authors acknowledge the use of IISER Mohali HPC facility. This research has used NASA’s Astrophysics Data System Bibliographic Services. The authors thank the Department of Science and Technology (DST), Government of India, for financial support through Council of Scientific and Industrial Research-UGC research fellowship. The authors would like to thank the anonymous referee for the helpful comments.
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This article is part of the Special Issue on “Indian Participation in the SKA”.
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Bharti, S., Bagla, J.S. Upcoming SKA precursor surveys and sensitivity to HI mass function. J Astrophys Astron 43, 95 (2022). https://doi.org/10.1007/s12036-022-09884-x
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DOI: https://doi.org/10.1007/s12036-022-09884-x