An HI study of the collisional ring galaxy NGC 922

Ahmed Elagali, O. Ivy Wong, Se Heon Oh, Lister Staveley-Smith, Bärbel S. Koribalski, Kenji Bekki, Martin Zwaan

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We present new atomic hydrogen (H I) observations of the collisional ring galaxy NGC 922 obtained using the Australia Telescope Compact Array. Our observations reveal for the first time the vast extent of the HI disc of this galaxy. The HI morphology and kinematics of NGC 922 show that this galaxy is not the product of a simple drop-through interaction, but has a more complex interaction history. The integrated HI flux density of NGC 922 from our observations is 24.7 Jy kms-1, which is within the error of the flux value obtained using the 64-m Parkes radio telescope. This flux density translates to a total HI mass of 1.1 × 1010M and corresponds to an HI to total mass fraction (MHI/Mtot) of approximately 0.11. The gaseous structures of NGC922 are more extended to the north and include anHI tail that has a projected physical length of 8 kpc. Gas warps are also evident in the velocity field of NGC 922 and are more prominent on the approaching and the western side of the disc. In comparison with a large sample of star-forming galaxies in the local Universe, NGC 922 possesses a high gas fraction relative to galaxies with a similar stellar mass of ~1010.4M, and exhibits a high specific star formation rate.

Original languageEnglish
Pages (from-to)5681-5691
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume476
Issue number4
DOIs
Publication statusPublished - 1 Jun 2018

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ring galaxies
galaxies
flux density
gas
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star formation rate
kinematics
stellar mass
gases
hydrogen
radio
universe
velocity distribution
histories
interactions
telescopes
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Elagali, Ahmed ; Ivy Wong, O. ; Oh, Se Heon ; Staveley-Smith, Lister ; Koribalski, Bärbel S. ; Bekki, Kenji ; Zwaan, Martin. / An HI study of the collisional ring galaxy NGC 922. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 476, No. 4. pp. 5681-5691.
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abstract = "We present new atomic hydrogen (H I) observations of the collisional ring galaxy NGC 922 obtained using the Australia Telescope Compact Array. Our observations reveal for the first time the vast extent of the HI disc of this galaxy. The HI morphology and kinematics of NGC 922 show that this galaxy is not the product of a simple drop-through interaction, but has a more complex interaction history. The integrated HI flux density of NGC 922 from our observations is 24.7 Jy kms-1, which is within the error of the flux value obtained using the 64-m Parkes radio telescope. This flux density translates to a total HI mass of 1.1 × 1010M⊙ and corresponds to an HI to total mass fraction (MHI/Mtot) of approximately 0.11. The gaseous structures of NGC922 are more extended to the north and include anHI tail that has a projected physical length of 8 kpc. Gas warps are also evident in the velocity field of NGC 922 and are more prominent on the approaching and the western side of the disc. In comparison with a large sample of star-forming galaxies in the local Universe, NGC 922 possesses a high gas fraction relative to galaxies with a similar stellar mass of ~1010.4M⊙, and exhibits a high specific star formation rate.",
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An HI study of the collisional ring galaxy NGC 922. / Elagali, Ahmed; Ivy Wong, O.; Oh, Se Heon; Staveley-Smith, Lister; Koribalski, Bärbel S.; Bekki, Kenji; Zwaan, Martin.

In: Monthly Notices of the Royal Astronomical Society, Vol. 476, No. 4, 01.06.2018, p. 5681-5691.

Research output: Contribution to journalArticle

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T1 - An HI study of the collisional ring galaxy NGC 922

AU - Elagali, Ahmed

AU - Ivy Wong, O.

AU - Oh, Se Heon

AU - Staveley-Smith, Lister

AU - Koribalski, Bärbel S.

AU - Bekki, Kenji

AU - Zwaan, Martin

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N2 - We present new atomic hydrogen (H I) observations of the collisional ring galaxy NGC 922 obtained using the Australia Telescope Compact Array. Our observations reveal for the first time the vast extent of the HI disc of this galaxy. The HI morphology and kinematics of NGC 922 show that this galaxy is not the product of a simple drop-through interaction, but has a more complex interaction history. The integrated HI flux density of NGC 922 from our observations is 24.7 Jy kms-1, which is within the error of the flux value obtained using the 64-m Parkes radio telescope. This flux density translates to a total HI mass of 1.1 × 1010M⊙ and corresponds to an HI to total mass fraction (MHI/Mtot) of approximately 0.11. The gaseous structures of NGC922 are more extended to the north and include anHI tail that has a projected physical length of 8 kpc. Gas warps are also evident in the velocity field of NGC 922 and are more prominent on the approaching and the western side of the disc. In comparison with a large sample of star-forming galaxies in the local Universe, NGC 922 possesses a high gas fraction relative to galaxies with a similar stellar mass of ~1010.4M⊙, and exhibits a high specific star formation rate.

AB - We present new atomic hydrogen (H I) observations of the collisional ring galaxy NGC 922 obtained using the Australia Telescope Compact Array. Our observations reveal for the first time the vast extent of the HI disc of this galaxy. The HI morphology and kinematics of NGC 922 show that this galaxy is not the product of a simple drop-through interaction, but has a more complex interaction history. The integrated HI flux density of NGC 922 from our observations is 24.7 Jy kms-1, which is within the error of the flux value obtained using the 64-m Parkes radio telescope. This flux density translates to a total HI mass of 1.1 × 1010M⊙ and corresponds to an HI to total mass fraction (MHI/Mtot) of approximately 0.11. The gaseous structures of NGC922 are more extended to the north and include anHI tail that has a projected physical length of 8 kpc. Gas warps are also evident in the velocity field of NGC 922 and are more prominent on the approaching and the western side of the disc. In comparison with a large sample of star-forming galaxies in the local Universe, NGC 922 possesses a high gas fraction relative to galaxies with a similar stellar mass of ~1010.4M⊙, and exhibits a high specific star formation rate.

KW - Galaxies: individual: NGC 922

KW - Galaxies: kinematics and dynamics

KW - Galaxies: starburst

KW - Radio lines: galaxies

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