THE FIRST DISTANCE CONSTRAINT ON THE RENEGADE HIGH-VELOCITY CLOUD COMPLEX WD
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 bra...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
IOP Publishing
2017
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| Online Access: | http://hdl.handle.net/1721.1/110012 |
| _version_ | 1811075410836848640 |
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| author | Peek, J. E. G. Bordoloi, Rongmon Sana, Hugues Roman-Duval, Julia Tumlinson, Jason Zheng, Yong |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Peek, J. E. G. Bordoloi, Rongmon Sana, Hugues Roman-Duval, Julia Tumlinson, Jason Zheng, Yong |
| author_sort | Peek, J. E. G. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T10:05:27Z |
| format | Article |
| id | mit-1721.1/110012 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:05:27Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1100122024-06-27T19:26:02Z THE FIRST DISTANCE CONSTRAINT ON THE RENEGADE HIGH-VELOCITY CLOUD COMPLEX WD Peek, J. E. G. Bordoloi, Rongmon Sana, Hugues Roman-Duval, Julia Tumlinson, Jason Zheng, Yong MIT Kavli Institute for Astrophysics and Space Research Bordoloi, Rongmon 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. United States. National Aeronautics and Space Administration (NNX08AR22G) National Science Foundation (U.S.) (AST-1238877) 2017-06-19T15:00:46Z 2017-06-19T15:00:46Z 2016-09 2016-08 Article http://purl.org/eprint/type/JournalArticle 2041-8213 http://hdl.handle.net/1721.1/110012 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 en_US http://dx.doi.org/10.3847/2041-8205/828/2/L20 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing American Astronomical Society |
| spellingShingle | Peek, J. E. G. Bordoloi, Rongmon Sana, Hugues Roman-Duval, Julia Tumlinson, Jason Zheng, Yong THE FIRST DISTANCE CONSTRAINT ON THE RENEGADE HIGH-VELOCITY CLOUD COMPLEX WD |
| title | THE FIRST DISTANCE CONSTRAINT ON THE RENEGADE HIGH-VELOCITY CLOUD COMPLEX WD |
| title_full | THE FIRST DISTANCE CONSTRAINT ON THE RENEGADE HIGH-VELOCITY CLOUD COMPLEX WD |
| title_fullStr | THE FIRST DISTANCE CONSTRAINT ON THE RENEGADE HIGH-VELOCITY CLOUD COMPLEX WD |
| title_full_unstemmed | THE FIRST DISTANCE CONSTRAINT ON THE RENEGADE HIGH-VELOCITY CLOUD COMPLEX WD |
| title_short | THE FIRST DISTANCE CONSTRAINT ON THE RENEGADE HIGH-VELOCITY CLOUD COMPLEX WD |
| title_sort | first distance constraint on the renegade high velocity cloud complex wd |
| url | http://hdl.handle.net/1721.1/110012 |
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