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29 March 2024 |
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HISS, a new tool for H I stacking: application to NIBLES spectra | J. Healy
; S-L. Blyth
; E. Elson
; W. van Driel
; Z. Butcher
; S. Schneider
; M.D. Lehnert
; R. Minchin
; | Date: |
1 Aug 2019 | Abstract: | H I stacking has proven to be a highly effective tool to statistically
analyse average H I properties for samples of galaxies which may or may not be
directly detected. With the plethora of H I data expected from the various
upcoming H I surveys with the SKA Precursor and Pathfinder telescopes, it will
be helpful to standardize the way in which stacking analyses are conducted. In
this work we present a new PYTHON-based package, HISS, designed to stack H I
(emission and absorption) spectra in a consistent and reliable manner. As an
example, we use HISS to study the H I content in various galaxy sub-samples
from the NIBLES survey of SDSS galaxies which were selected to represent their
entire range in total stellar mass without a prior colour selection. This
allowed us to compare the galaxy colour to average H I content in both detected
and non-detected galaxies. Our sample, with a stellar mass range of 10^8 lt {{
M}}_star (M_odot) lt 10^{12}, has enabled us to probe the H I-to-stellar
mass gas fraction relationship more than half an order of magnitude lower than
in previous stacking studies. | Source: | arXiv, 1908.0517 | Services: | Forum | Review | PDF | Favorites |
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