THE FIRST DISTANCE CONSTRAINT ON THE RENEGADE HIGH-VELOCITY CLOUD COMPLEX WD
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Peek-2016-The first distance constraint on the.pdf
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Author(s)
Peek, J. E. G.
Bordoloi, Rongmon
Sana, Hugues
Roman-Duval, Julia
Tumlinson, Jason
Zheng, Yong
Date Issued
September 2016
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Peek, J. E. G.; Bordoloi, Rongmon; Sana, Hugues; Roman-Duval, Julia; Tumlinson, Jason and Zheng, Yong. “THE FIRST DISTANCE CONSTRAINT ON THE RENEGADE HIGH-VELOCITY CLOUD COMPLEX WD.” The Astrophysical Journal 828, no. 2 (September 2016): L20. © 2016 The American Astronomical Society
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Final published version
Abstract
We present medium-resolution, near-ultraviolet Very Large Telescope/FLAMES observations of the star USNO-A0600-15865535. We adapt a standard method of stellar typing to our measurement of the shape of the Balmer epsilon absorption line to demonstrate that USNO-A0600-15865535 is a blue horizontal branch star, residing in the lower stellar halo at a distance of 4.4 kpc from the Sun. We measure the H & K lines of singly ionized calcium and find two isolated velocity components, one originating in the disk, and one associated with the high-velocity cloud complex WD. This detection demonstrated that complex WD is closer than ~4.4 kpc and is the first distance constraint on the +100 km s⁻¹ Galactic complex of clouds. We find that complex WD is not in corotation with the Galactic disk, which has been assumed for decades. We examine a number of scenarios and find that the most likely scenario is that complex WD was ejected from the solar neighborhood and is only a few kiloparsecs from the Sun.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/2041-8205/828/2/L20
