Kinematics and simulations of the stellar stream in the halo of the Umbrella Galaxy

C. Foster, H. Lux, A. J. Romanowsky, D. Martínez-Delgado, S. Zibetti, J. A. Arnold, J. P. Brodie, R. Ciardullo, R. J. GaBany, M. R. Merrifield, N. Singh, J. Strader

Research output: Contribution to journalArticle

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Abstract

We study the dynamics of faint stellar substructures around the Umbrella Galaxy, NGC 4651, which hosts a dramatic system of streams and shells formed through the tidal disruption of a nucleated dwarf elliptical galaxy.We elucidate the basic characteristics of the system (colours, luminosities, stellarmasses) usingmultiband Subaru/Suprime-Cam images. The implied stellar mass ratio of the ongoing merger event is ~1:50. We identify candidate kinematic tracers (globular clusters, planetary nebulae, HII regions) and follow up a subset with Keck/DEIMOS (DEep Imaging Multi-object Spectrograph) spectroscopy to obtain velocities. We find that 15 of the tracers are likely associated with halo substructures, including the probable stream progenitor nucleus. These objects delineate a kinematically cold feature in position-velocity phase space.We model the stream using single test particle orbits, plus a rescaled pre-existing N-body simulation. We infer a very eccentric orbit with a period of ~0.35 Gyr and turning points at ~2-4 and ~40 kpc, implying a recent passage of the satellite through the disc, which may have provoked the visible disturbances in the host galaxy. This work confirms that the kinematics of low surface brightness substructures can be recovered and modelled using discrete tracers - a breakthrough that opens up a fresh avenue for unravelling the detailed physics of minor merging.

Original languageEnglish (US)
Article numberstu1074
Pages (from-to)3544-3564
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume442
Issue number4
DOIs
StatePublished - Aug 2014

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substructures
tracers
halos
kinematics
tracer
galaxies
simulation
cams
eccentric orbits
elliptical galaxies
planetary nebulae
phase velocity
dwarf galaxies
globular clusters
stellar mass
mass ratios
merger
set theory
spectrographs
brightness

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Foster, C., Lux, H., Romanowsky, A. J., Martínez-Delgado, D., Zibetti, S., Arnold, J. A., ... Strader, J. (2014). Kinematics and simulations of the stellar stream in the halo of the Umbrella Galaxy. Monthly Notices of the Royal Astronomical Society, 442(4), 3544-3564. [stu1074]. https://doi.org/10.1093/mnras/stu1074
Foster, C. ; Lux, H. ; Romanowsky, A. J. ; Martínez-Delgado, D. ; Zibetti, S. ; Arnold, J. A. ; Brodie, J. P. ; Ciardullo, R. ; GaBany, R. J. ; Merrifield, M. R. ; Singh, N. ; Strader, J. / Kinematics and simulations of the stellar stream in the halo of the Umbrella Galaxy. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 442, No. 4. pp. 3544-3564.
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Foster, C, Lux, H, Romanowsky, AJ, Martínez-Delgado, D, Zibetti, S, Arnold, JA, Brodie, JP, Ciardullo, R, GaBany, RJ, Merrifield, MR, Singh, N & Strader, J 2014, 'Kinematics and simulations of the stellar stream in the halo of the Umbrella Galaxy', Monthly Notices of the Royal Astronomical Society, vol. 442, no. 4, stu1074, pp. 3544-3564. https://doi.org/10.1093/mnras/stu1074

Kinematics and simulations of the stellar stream in the halo of the Umbrella Galaxy. / Foster, C.; Lux, H.; Romanowsky, A. J.; Martínez-Delgado, D.; Zibetti, S.; Arnold, J. A.; Brodie, J. P.; Ciardullo, R.; GaBany, R. J.; Merrifield, M. R.; Singh, N.; Strader, J.

In: Monthly Notices of the Royal Astronomical Society, Vol. 442, No. 4, stu1074, 08.2014, p. 3544-3564.

Research output: Contribution to journalArticle

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AU - Foster, C.

AU - Lux, H.

AU - Romanowsky, A. J.

AU - Martínez-Delgado, D.

AU - Zibetti, S.

AU - Arnold, J. A.

AU - Brodie, J. P.

AU - Ciardullo, R.

AU - GaBany, R. J.

AU - Merrifield, M. R.

AU - Singh, N.

AU - Strader, J.

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N2 - We study the dynamics of faint stellar substructures around the Umbrella Galaxy, NGC 4651, which hosts a dramatic system of streams and shells formed through the tidal disruption of a nucleated dwarf elliptical galaxy.We elucidate the basic characteristics of the system (colours, luminosities, stellarmasses) usingmultiband Subaru/Suprime-Cam images. The implied stellar mass ratio of the ongoing merger event is ~1:50. We identify candidate kinematic tracers (globular clusters, planetary nebulae, HII regions) and follow up a subset with Keck/DEIMOS (DEep Imaging Multi-object Spectrograph) spectroscopy to obtain velocities. We find that 15 of the tracers are likely associated with halo substructures, including the probable stream progenitor nucleus. These objects delineate a kinematically cold feature in position-velocity phase space.We model the stream using single test particle orbits, plus a rescaled pre-existing N-body simulation. We infer a very eccentric orbit with a period of ~0.35 Gyr and turning points at ~2-4 and ~40 kpc, implying a recent passage of the satellite through the disc, which may have provoked the visible disturbances in the host galaxy. This work confirms that the kinematics of low surface brightness substructures can be recovered and modelled using discrete tracers - a breakthrough that opens up a fresh avenue for unravelling the detailed physics of minor merging.

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Foster C, Lux H, Romanowsky AJ, Martínez-Delgado D, Zibetti S, Arnold JA et al. Kinematics and simulations of the stellar stream in the halo of the Umbrella Galaxy. Monthly Notices of the Royal Astronomical Society. 2014 Aug;442(4):3544-3564. stu1074. https://doi.org/10.1093/mnras/stu1074