HI asymmetries with LVHIS, VIVA, and HALOGAS

DOI

We present an analysis of morphological, kinematic, and spectral asymmetries in observations of atomic neutral hydrogen (HI) gas from the Local Volume HI Survey (LVHIS), the VLA Imaging of Virgo in Atomic Gas (VIVA) survey, and the Hydrogen Accretion in Local Galaxies Survey. With the aim of investigating the impact of the local environment density and stellar mass on the measured HI asymmetries in future large HI surveys, we provide recommendations for the most meaningful measures of asymmetry for use in future analysis. After controlling for stellar mass, we find signs of statistically significant trends of increasing asymmetries with local density. The most significant trend we measure is for the normalized flipped spectrum residual (A_spec_), with mean LVHIS and VIVA values of 0.204+/-0.011 and 0.615+/-0.068 at average weighted 10th nearest-neighbour galaxy number densities of log({rho}10/Mpc^-3^) =-1.64 and 0.88, respectively. Looking ahead to the Widefield ASKAP L-band Legacy All-sky Blind survey on the Australian Square Kilometre Array Pathfinder, we estimate that the number of detections will be sufficient to provide coverage over 5 orders of magnitude in both local density and stellar mass increasing the dynamic range and accuracy with which we can probe the effect of these properties on the asymmetry in the distribution of atomic gas in galaxies.

Cone search capability for table J/MNRAS/493/5089/tablea1 (Asymmetry parameters for LVHIS galaxies)

Cone search capability for table J/MNRAS/493/5089/tablea2 (Asymmetry parameters for VIVA galaxies)

Cone search capability for table J/MNRAS/493/5089/tablea3 (Asymmetry parameters for HALOGAS galaxies)

Identifier
DOI http://doi.org/10.26093/cds/vizier.74935089
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/MNRAS/493/5089
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/493/5089
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/493/5089
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/MNRAS/493/5089
Provenance
Creator Reynolds T.N.; Westmeier T.; Staveley-Smith L.; Chauhan G.; Lagos C.D.P.
Publisher CDS
Publication Year 2023
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Galactic and extragalactic Astronomy; Interdisciplinary Astronomy; Interstellar medium; Natural Sciences; Observational Astronomy; Physics