The HIX galaxy survey - II. HI kinematics of HI eXtreme galaxies

K. A. Lutz; V. A. Kilborn; B. S. Koribalski; B. Catinella; G. I.G. Józsa; O. I. Wong; A. R.H. Stevens; D. Obreschkow; H. Dénes

doi:10.1093/MNRAS/STY387

The HIX galaxy survey - II. HI kinematics of HI eXtreme galaxies

K. A. Lutz^*, V. A. Kilborn, B. S. Koribalski, B. Catinella, G. I.G. Józsa, O. I. Wong, A. R.H. Stevens, D. Obreschkow, H. Dénes

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

By analysing a sample of galaxies selected from the HI Parkes All Sky Survey (HIPASS) to contain more than 2.5 times their expected HI content based on their optical properties, we investigate what drives these HI eXtreme (HIX) galaxies to be so HI-rich. We model the HI kinematics with the Tilted Ring Fitting Code TiRiFiC and compare the observed HIX galaxies to a control sample of galaxies from HIPASS as well as simulated galaxies built with the semianalytic model DARK SAGE. We find that (1) HI discs in HIX galaxies are more likely to be warped and more likely to host HI arms and tails than in the control galaxies, (2) the average HI and average stellar column density of HIX galaxies is comparable to the control sample, (3) HIX galaxies have higher HI and baryonic specific angular momenta than control galaxies, (4) most HIX galaxies live in higher spin haloes than most control galaxies. These results suggest that HIX galaxies are HI-rich because they can support more HI against gravitational instability due to their high specific angular momentum. The majority of the HIX galaxies inherits their high specific angular momentum from their halo. The HI content of HIX galaxies might be further increased by gas-rich minor mergers. This paper is based on data obtained with the Australia Telescope Compact Array through the large program C 2705.

Original language	English
Pages (from-to)	3744-3780
Number of pages	37
Journal	Monthly Notices of the Royal Astronomical Society
Volume	476
Issue number	3
DOIs	https://doi.org/10.1093/MNRAS/STY387
Publication status	Published - 21 May 2018

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title = "The HIX galaxy survey - II. HI kinematics of HI eXtreme galaxies",

abstract = "By analysing a sample of galaxies selected from the HI Parkes All Sky Survey (HIPASS) to contain more than 2.5 times their expected HI content based on their optical properties, we investigate what drives these HI eXtreme (HIX) galaxies to be so HI-rich. We model the HI kinematics with the Tilted Ring Fitting Code TiRiFiC and compare the observed HIX galaxies to a control sample of galaxies from HIPASS as well as simulated galaxies built with the semianalytic model DARK SAGE. We find that (1) HI discs in HIX galaxies are more likely to be warped and more likely to host HI arms and tails than in the control galaxies, (2) the average HI and average stellar column density of HIX galaxies is comparable to the control sample, (3) HIX galaxies have higher HI and baryonic specific angular momenta than control galaxies, (4) most HIX galaxies live in higher spin haloes than most control galaxies. These results suggest that HIX galaxies are HI-rich because they can support more HI against gravitational instability due to their high specific angular momentum. The majority of the HIX galaxies inherits their high specific angular momentum from their halo. The HI content of HIX galaxies might be further increased by gas-rich minor mergers. This paper is based on data obtained with the Australia Telescope Compact Array through the large program C 2705.",

keywords = "Galaxies: ISM- galaxies: kinematics and dynamics, Galaxies: evolution, Galaxies: formation",

author = "Lutz, {K. A.} and Kilborn, {V. A.} and Koribalski, {B. S.} and B. Catinella and J{\'o}zsa, {G. I.G.} and Wong, {O. I.} and Stevens, {A. R.H.} and D. Obreschkow and H. D{\'e}nes",

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year = "2018",

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doi = "10.1093/MNRAS/STY387",

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T1 - The HIX galaxy survey - II. HI kinematics of HI eXtreme galaxies

AU - Lutz, K. A.

AU - Kilborn, V. A.

AU - Koribalski, B. S.

AU - Catinella, B.

AU - Józsa, G. I.G.

AU - Wong, O. I.

AU - Stevens, A. R.H.

AU - Obreschkow, D.

AU - Dénes, H.

PY - 2018/5/21

Y1 - 2018/5/21

N2 - By analysing a sample of galaxies selected from the HI Parkes All Sky Survey (HIPASS) to contain more than 2.5 times their expected HI content based on their optical properties, we investigate what drives these HI eXtreme (HIX) galaxies to be so HI-rich. We model the HI kinematics with the Tilted Ring Fitting Code TiRiFiC and compare the observed HIX galaxies to a control sample of galaxies from HIPASS as well as simulated galaxies built with the semianalytic model DARK SAGE. We find that (1) HI discs in HIX galaxies are more likely to be warped and more likely to host HI arms and tails than in the control galaxies, (2) the average HI and average stellar column density of HIX galaxies is comparable to the control sample, (3) HIX galaxies have higher HI and baryonic specific angular momenta than control galaxies, (4) most HIX galaxies live in higher spin haloes than most control galaxies. These results suggest that HIX galaxies are HI-rich because they can support more HI against gravitational instability due to their high specific angular momentum. The majority of the HIX galaxies inherits their high specific angular momentum from their halo. The HI content of HIX galaxies might be further increased by gas-rich minor mergers. This paper is based on data obtained with the Australia Telescope Compact Array through the large program C 2705.

AB - By analysing a sample of galaxies selected from the HI Parkes All Sky Survey (HIPASS) to contain more than 2.5 times their expected HI content based on their optical properties, we investigate what drives these HI eXtreme (HIX) galaxies to be so HI-rich. We model the HI kinematics with the Tilted Ring Fitting Code TiRiFiC and compare the observed HIX galaxies to a control sample of galaxies from HIPASS as well as simulated galaxies built with the semianalytic model DARK SAGE. We find that (1) HI discs in HIX galaxies are more likely to be warped and more likely to host HI arms and tails than in the control galaxies, (2) the average HI and average stellar column density of HIX galaxies is comparable to the control sample, (3) HIX galaxies have higher HI and baryonic specific angular momenta than control galaxies, (4) most HIX galaxies live in higher spin haloes than most control galaxies. These results suggest that HIX galaxies are HI-rich because they can support more HI against gravitational instability due to their high specific angular momentum. The majority of the HIX galaxies inherits their high specific angular momentum from their halo. The HI content of HIX galaxies might be further increased by gas-rich minor mergers. This paper is based on data obtained with the Australia Telescope Compact Array through the large program C 2705.

KW - Galaxies: ISM- galaxies: kinematics and dynamics

KW - Galaxies: evolution

KW - Galaxies: formation

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U2 - 10.1093/MNRAS/STY387

DO - 10.1093/MNRAS/STY387

M3 - Article

SN - 0035-8711

VL - 476

SP - 3744

EP - 3780

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

The HIX galaxy survey - II. HI kinematics of HI eXtreme galaxies

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