THE STELLAR AND GASEOUS CONTENTS OF THE ORION DWARF GALAXY

John M. Cannon; Korey Haynes; Hans Most; John J. Salzer; Kaitlin Haugland; Jillian Scudder; Arthur Sugden; Jacob Weindling

doi:10.1088/0004-6256/139/6/2170

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THE STELLAR AND GASEOUS CONTENTS OF THE ORION DWARF GALAXY

Journal article

Open access

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THE STELLAR AND GASEOUS CONTENTS OF THE ORION DWARF GALAXY

John M. Cannon, Korey Haynes, Hans Most, John J. Salzer, Kaitlin Haugland, Jillian Scudder, Arthur Sugden and Jacob Weindling

The Astronomical journal, Vol.139(6), pp.2170-2183

06/01/2010

DOI: 10.1088/0004-6256/139/6/2170

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Abstract

We present new Kitt Peak National Observatory 0.9 m optical and Very Large Array Hi spectral line observations of the Orion dwarf galaxy. This nearby (D similar or equal to 5.4 Mpc), intermediate-mass (M(dyn) similar or equal to 1.1 x 10(10) M(circle dot)) dwarf displays a wealth of structure in its neutral interstellar medium, including three prominent "hole/depression" features in the inner Hi disk. We explore the rich gas kinematics, where solid-body rotation dominates and the rotation curve is flat out to the observed edge of the Hi disk (similar to 6.8 kpc). The Orion dwarf contains a substantial fraction of dark matter throughout its disk: comparing the 4.7 x 10(8) M(circle dot) of detected neutral gas with estimates of the stellar mass from optical and near-infrared imaging (3.7 x 10(8) M(circle dot)) implies a mass-to-light ratio similar or equal to 13. New H alpha observations show only modest-strength current star formation (SF; similar to 0.04 M(circle dot) yr(-1)); this SF rate is consistent with our 1.4 GHz radio continuum non-detection.

Astronomy & Astrophysics

Physical Sciences

Science & Technology

Details

Title: Subtitle: THE STELLAR AND GASEOUS CONTENTS OF THE ORION DWARF GALAXY
Creators: John M. Cannon - Macalester College
Korey Haynes - Macalester College
Hans Most - Macalester College
John J. Salzer - Indiana University Bloomington
Kaitlin Haugland - Macalester College
Jillian Scudder - University of Victoria
Arthur Sugden - Indiana University Bloomington
Jacob Weindling - Macalester College
Resource Type: Journal article
Publication Details: The Astronomical journal, Vol.139(6), pp.2170-2183
Publisher: Iop Publishing Ltd
DOI: 10.1088/0004-6256/139/6/2170
ISSN: 0004-6256
eISSN: 1538-3881
Number of pages: 14
Grant note: 0823801 / Division Of Astronomical Sciences; Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) Indiana University AST-0823801 / National Science Foundation; National Science Foundation (NSF) National Aeronautics and Space Administration; National Aeronautics & Space Administration (NASA)
Language: English
Date published: 06/01/2010
Academic Unit: Physics and Astronomy
Record Identifier: 9984627231802771

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