DELVE-ing into the Jet: A Thin Stellar Stream on a Retrograde Orbit at 30 kpc
Authors
Erkal, D
Publication Date
2022Journal Title
Astronomical Journal
ISSN
0004-6256
Publisher
American Astronomical Society
Volume
163
Issue
1
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Ferguson, P., Shipp, N., Drlica-Wagner, A., Li, T., Cerny, W., Tavangar, K., Pace, A., et al. (2022). DELVE-ing into the Jet: A Thin Stellar Stream on a Retrograde Orbit at 30 kpc. Astronomical Journal, 163 (1) https://doi.org/10.3847/1538-3881/ac3492
Abstract
<jats:title>Abstract</jats:title>
<jats:p>We perform a detailed photometric and astrometric analysis of stars in the Jet stream using data from the first data release of the DECam Local Volume Exploration Survey DR1 and Gaia EDR3. We discover that the stream extends over ∼ 29° on the sky (increasing the known length by 18°), which is comparable to the kinematically cold Phoenix, ATLAS, and GD-1 streams. Using blue horizontal branch stars, we resolve a distance gradient along the Jet stream of 0.2 kpc deg<jats:sup>−1</jats:sup>, with distances ranging from <jats:italic>D</jats:italic>
<jats:sub>⊙</jats:sub> ∼ 27–34 kpc. We use natural splines to simultaneously fit the stream track, width, and intensity to quantitatively characterize density variations in the Jet stream, including a large gap, and identify substructure off the main track of the stream. Furthermore, we report the first measurement of the proper motion of the Jet stream and find that it is well aligned with the stream track, suggesting the stream has likely not been significantly perturbed perpendicular to the line of sight. Finally, we fit the stream with a dynamical model and find that it is on a retrograde orbit, and is well fit by a gravitational potential including the Milky Way and Large Magellanic Cloud. These results indicate the Jet stream is an excellent candidate for future studies with deeper photometry, astrometry, and spectroscopy to study the potential of the Milky Way and probe perturbations from baryonic and dark matter substructure.</jats:p>
Keywords
310, Galaxies and Cosmology
Sponsorship
National Science Foundation (NSF) (AST-1813881)
Identifiers
ajac3492, ac3492, aas31785
External DOI: https://doi.org/10.3847/1538-3881/ac3492
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334152
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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