HI study of the NGC 6744 system

Stuart D. Ryder; Wilfred Walsh; David Malin

doi:10.1071/AS99084

HI study of the NGC 6744 system

Stuart D. Ryder^*, Wilfred Walsh, David Malin

^*Corresponding author for this work

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

12 Citations (Scopus)

Abstract

We present the preliminary results of our 5-configuration, 20-pointing mosaic with the Australia Telescope Compact Array of the neutral hydrogen in the nearby spiral galaxy NGC 6744. The bulk of the HI resides in a 'ring' underlying the outer optical disk, with 2 HI spiral arms extending further out to almost 1-5 optical radii. The velocity field is fairly regular, apart from evidence for streaming motions along the HI arms, and the influence of the companion IB(s)m galaxy NGC 6744A. We associate a cloud of HI at a heliocentric velocity of 846 km s^-1 with another companion object, ESO 104-g44. Our attempts to construct a mass model for NGC 6744 suffer from poor resolution in the inner disk, and the uncertainty in the total HI flux of NGC 6744. We anticipate that HIPASS observations will be crucial in resolving the latter issue.

Original language	English
Pages (from-to)	84-88
Number of pages	5
Journal	Publications of the Astronomical Society of Australia
Volume	16
Issue number	1
DOIs	https://doi.org/10.1071/AS99084
Publication status	Published - 1 Jan 1999
Externally published	Yes

Keywords

Galaxies: individual (NGC 6744)
Galaxies: interactions
Galaxies: kinematics and dynamics
Galaxies: spiral

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10.1071/AS99084

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title = "HI study of the NGC 6744 system",

abstract = "We present the preliminary results of our 5-configuration, 20-pointing mosaic with the Australia Telescope Compact Array of the neutral hydrogen in the nearby spiral galaxy NGC 6744. The bulk of the HI resides in a 'ring' underlying the outer optical disk, with 2 HI spiral arms extending further out to almost 1-5 optical radii. The velocity field is fairly regular, apart from evidence for streaming motions along the HI arms, and the influence of the companion IB(s)m galaxy NGC 6744A. We associate a cloud of HI at a heliocentric velocity of 846 km s-1 with another companion object, ESO 104-g44. Our attempts to construct a mass model for NGC 6744 suffer from poor resolution in the inner disk, and the uncertainty in the total HI flux of NGC 6744. We anticipate that HIPASS observations will be crucial in resolving the latter issue.",

keywords = "Galaxies: individual (NGC 6744), Galaxies: interactions, Galaxies: kinematics and dynamics, Galaxies: spiral",

author = "Ryder, {Stuart D.} and Wilfred Walsh and David Malin",

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T1 - HI study of the NGC 6744 system

AU - Ryder, Stuart D.

AU - Walsh, Wilfred

AU - Malin, David

PY - 1999/1/1

Y1 - 1999/1/1

N2 - We present the preliminary results of our 5-configuration, 20-pointing mosaic with the Australia Telescope Compact Array of the neutral hydrogen in the nearby spiral galaxy NGC 6744. The bulk of the HI resides in a 'ring' underlying the outer optical disk, with 2 HI spiral arms extending further out to almost 1-5 optical radii. The velocity field is fairly regular, apart from evidence for streaming motions along the HI arms, and the influence of the companion IB(s)m galaxy NGC 6744A. We associate a cloud of HI at a heliocentric velocity of 846 km s-1 with another companion object, ESO 104-g44. Our attempts to construct a mass model for NGC 6744 suffer from poor resolution in the inner disk, and the uncertainty in the total HI flux of NGC 6744. We anticipate that HIPASS observations will be crucial in resolving the latter issue.

AB - We present the preliminary results of our 5-configuration, 20-pointing mosaic with the Australia Telescope Compact Array of the neutral hydrogen in the nearby spiral galaxy NGC 6744. The bulk of the HI resides in a 'ring' underlying the outer optical disk, with 2 HI spiral arms extending further out to almost 1-5 optical radii. The velocity field is fairly regular, apart from evidence for streaming motions along the HI arms, and the influence of the companion IB(s)m galaxy NGC 6744A. We associate a cloud of HI at a heliocentric velocity of 846 km s-1 with another companion object, ESO 104-g44. Our attempts to construct a mass model for NGC 6744 suffer from poor resolution in the inner disk, and the uncertainty in the total HI flux of NGC 6744. We anticipate that HIPASS observations will be crucial in resolving the latter issue.

KW - Galaxies: individual (NGC 6744)

KW - Galaxies: interactions

KW - Galaxies: kinematics and dynamics

KW - Galaxies: spiral

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JO - Publications of the Astronomical Society of Australia

JF - Publications of the Astronomical Society of Australia

IS - 1

ER -

HI study of the NGC 6744 system

Abstract

Keywords

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