THE NEUTRAL GAS DYNAMICS OF THE NEARBY MAGELLANIC IRREGULAR GALAXY UGCA 105

John M. Cannon; Elijah Z. Bernstein-Cooper; Ian M. Cave; Jon B. Harris; Melissa V. Marshall; Jacob M. Moen; Samilee J. Moody; Erin M. O'Leary; Stephen A. Pardy; Clara M. Thomann

doi:10.1088/0004-6256/144/3/82

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THE NEUTRAL GAS DYNAMICS OF THE NEARBY MAGELLANIC IRREGULAR GALAXY UGCA 105

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THE NEUTRAL GAS DYNAMICS OF THE NEARBY MAGELLANIC IRREGULAR GALAXY UGCA 105

John M. Cannon, Elijah Z. Bernstein-Cooper, Ian M. Cave, Jon B. Harris, Melissa V. Marshall, Jacob M. Moen, Samilee J. Moody, Erin M. O'Leary, Stephen A. Pardy and Clara M. Thomann

The Astronomical journal, Vol.144(3), pp.1-9

09/01/2012

DOI: 10.1088/0004-6256/144/3/82

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Abstract

We present new low-resolution Hi spectral line imaging, obtained with the Karl G. Jansky Very Large Array, of the star-forming Magellanic irregular galaxy UGCA 105. This nearby (D = 3.39 +/- 0.25 Mpc), low-mass (M-HI = 4.3 +/- 0.5 x 10(8) M-circle dot) system harbors a large neutral gas disk (H I radius similar to 7.2 kpc at the N-HI = 10(20) cm(-2) level) that is roughly twice as large as the stellar disk at the B-band R-25 isophote. We explore the neutral gas dynamics of this system, fitting tilted ring models in order to extract a well-sampled rotation curve. The rotation velocity rises in the inner disk, flattens at 72 +/- 3 km s(-1), and remains flat to the last measured point of the disk (similar to 7.5 kpc). The dynamical mass of UGCA 105 at this outermost point, (9 +/- 2) x 10(9) M-circle dot, is similar to 10 times as large as the luminous baryonic components (neutral atomic gas and stars). The proximity and favorable inclination (55 degrees) of UGCA 105 make it a promising target for high-resolution studies of both star formation and rotational dynamics in a nearby low-mass galaxy.

Astronomy & Astrophysics

Physical Sciences

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Title: Subtitle: THE NEUTRAL GAS DYNAMICS OF THE NEARBY MAGELLANIC IRREGULAR GALAXY UGCA 105
Creators: John M. Cannon - Macalester College
Elijah Z. Bernstein-Cooper - Macalester College
Ian M. Cave - Macalester College
Jon B. Harris - Macalester College
Melissa V. Marshall - Macalester College
Jacob M. Moen - Macalester College
Samilee J. Moody - Macalester College
Erin M. O'Leary - Macalester Coll, Dept Phys & Astron, St Paul, MN 55105 USA
Stephen A. Pardy - Macalester College
Clara M. Thomann - Macalester College
Resource Type: Journal article
Publication Details: The Astronomical journal, Vol.144(3), pp.1-9
Publisher: Iop Publishing Ltd
DOI: 10.1088/0004-6256/144/3/82
ISSN: 0004-6256
eISSN: 1538-3881
Number of pages: 9
Language: English
Date published: 09/01/2012
Academic Unit: Physics and Astronomy
Record Identifier: 9984627219002771

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