Selecting Sagittarius: a study of Sagittarius dwarf members throughout the Milky Way Galactic halo

E. A. Hyde; D. B. Zucker; S. Keller; A. Siebert; R. Ibata; J. Penarrubia; S. L. Martell; G. Lewis; M. Irwin; A. Koch

Selecting Sagittarius: a study of Sagittarius dwarf members throughout the Milky Way Galactic halo

E. A. Hyde, D. B. Zucker, S. Keller, A. Siebert, R. Ibata, J. Penarrubia, S. L. Martell, G. Lewis, M. Irwin, A. Koch

Research output: Contribution to conference › Abstract

Abstract

Wrapping around the Milky Way, the Sagittarius (Sgr) stream is the most dominant substructure in the halo. Its progenitor, the Sgr dwarf galaxy, has been assumed to be a non-rotating, pressure-supported dwarf spheroidal galaxy. However, to date, no such model for the interaction of Sgr with the Milky Way has been able to reproduce all of the observational features of the stream. We have obtained spectra of over 21,000 stars in the stream and the core of Sgr, providing the most comprehensive spectral observations ever taken for this system. Our analysis demonstrates that Sgr is unlikely to have originated as a disk galaxy. Using careful selection criteria, we have identified several hundred likely members of the Sgr stream. From the most probable members identified, we characterize the chemical and dynamical nature and, through comparison to theory, provide a new mapping of this extended system of Sgr stars.

Original language	English
Pages	1
Number of pages	1
Publication status	Published - 2013
Event	Meeting of the American Astronomical Society (221st : 2013) - Long Beach, CA Duration: 6 Jan 2013 → 10 Jan 2013

Conference

Conference	Meeting of the American Astronomical Society (221st : 2013)
City	Long Beach, CA
Period	6/01/13 → 10/01/13

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@conference{5c9b371b20834c8b96d6a291dec17a1a,

title = "Selecting Sagittarius: a study of Sagittarius dwarf members throughout the Milky Way Galactic halo",

abstract = "Wrapping around the Milky Way, the Sagittarius (Sgr) stream is the most dominant substructure in the halo. Its progenitor, the Sgr dwarf galaxy, has been assumed to be a non-rotating, pressure-supported dwarf spheroidal galaxy. However, to date, no such model for the interaction of Sgr with the Milky Way has been able to reproduce all of the observational features of the stream. We have obtained spectra of over 21,000 stars in the stream and the core of Sgr, providing the most comprehensive spectral observations ever taken for this system. Our analysis demonstrates that Sgr is unlikely to have originated as a disk galaxy. Using careful selection criteria, we have identified several hundred likely members of the Sgr stream. From the most probable members identified, we characterize the chemical and dynamical nature and, through comparison to theory, provide a new mapping of this extended system of Sgr stars.",

author = "Hyde, {E. A.} and Zucker, {D. B.} and S. Keller and A. Siebert and R. Ibata and J. Penarrubia and Martell, {S. L.} and G. Lewis and M. Irwin and A. Koch",

year = "2013",

language = "English",

pages = "1",

note = "Meeting of the American Astronomical Society (221st : 2013) ; Conference date: 06-01-2013 Through 10-01-2013",

}

TY - CONF

T1 - Selecting Sagittarius

T2 - Meeting of the American Astronomical Society (221st : 2013)

AU - Hyde, E. A.

AU - Zucker, D. B.

AU - Keller, S.

AU - Siebert, A.

AU - Ibata, R.

AU - Penarrubia, J.

AU - Martell, S. L.

AU - Lewis, G.

AU - Irwin, M.

AU - Koch, A.

PY - 2013

Y1 - 2013

N2 - Wrapping around the Milky Way, the Sagittarius (Sgr) stream is the most dominant substructure in the halo. Its progenitor, the Sgr dwarf galaxy, has been assumed to be a non-rotating, pressure-supported dwarf spheroidal galaxy. However, to date, no such model for the interaction of Sgr with the Milky Way has been able to reproduce all of the observational features of the stream. We have obtained spectra of over 21,000 stars in the stream and the core of Sgr, providing the most comprehensive spectral observations ever taken for this system. Our analysis demonstrates that Sgr is unlikely to have originated as a disk galaxy. Using careful selection criteria, we have identified several hundred likely members of the Sgr stream. From the most probable members identified, we characterize the chemical and dynamical nature and, through comparison to theory, provide a new mapping of this extended system of Sgr stars.

AB - Wrapping around the Milky Way, the Sagittarius (Sgr) stream is the most dominant substructure in the halo. Its progenitor, the Sgr dwarf galaxy, has been assumed to be a non-rotating, pressure-supported dwarf spheroidal galaxy. However, to date, no such model for the interaction of Sgr with the Milky Way has been able to reproduce all of the observational features of the stream. We have obtained spectra of over 21,000 stars in the stream and the core of Sgr, providing the most comprehensive spectral observations ever taken for this system. Our analysis demonstrates that Sgr is unlikely to have originated as a disk galaxy. Using careful selection criteria, we have identified several hundred likely members of the Sgr stream. From the most probable members identified, we characterize the chemical and dynamical nature and, through comparison to theory, provide a new mapping of this extended system of Sgr stars.

M3 - Abstract

SP - 1

Y2 - 6 January 2013 through 10 January 2013

ER -

Selecting Sagittarius: a study of Sagittarius dwarf members throughout the Milky Way Galactic halo

Abstract

Conference

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