Mapping the galactic halo. V. Sagittarius dwarf spheroidal tidal debris 60° from the main body

Robbie C. Dohm-Palmer; Amina Helmi; Heather Morrison; Mario Mateo; Edward W. Olszewski; Paul Harding; Kenneth C. Freeman; John Norris; Stephen A. Shectman

doi:10.1086/321734

Mapping the galactic halo. V. Sagittarius dwarf spheroidal tidal debris 60° from the main body

Robbie C. Dohm-Palmer, Amina Helmi, Heather Morrison, Mario Mateo, Edward W. Olszewski, Paul Harding, Kenneth C. Freeman, John Norris, Stephen A. Shectman

Astronomy

Research output: Contribution to journal › Article › peer-review

64 Scopus citations

Abstract

As part of the Spaghetti Project Survey, we have detected a concentration of giant stars well above expectations for a smooth halo model. The position (l ∼ 350°, b ∼ 50°) and distance (∼50 kpc) of this concentration match those of the northern overdensity detected by the Sloan Digital Sky Survey. We find additional evidence for structure at ∼80 kpc in the same direction. We present radial velocities for many of these stars, including the first published results from the 6.5 m Magellan telescope. The radial velocities for stars in these structures are in excellent agreement with models of the dynamical evolution of the Sagittarius dwarf tidal debris, whose center is 60° away. The metallicity of stars in these streams is lower than that of the main body of the Sgr dwarf, which may indicate a radial metallicity gradient prior to disruption.

Original language	English (US)
Pages (from-to)	L37-L40
Journal	Astrophysical Journal
Volume	555
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/321734
State	Published - Jul 1 2001

Keywords

Galaxy: Evolution
Galaxy: Formation
Galaxy: Halo
Galaxy: Stellar content

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/321734

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Mapping the galactic halo. V. Sagittarius dwarf spheroidal tidal debris 60° from the main body. / Dohm-Palmer, Robbie C.; Helmi, Amina; Morrison, Heather; Mateo, Mario; Olszewski, Edward W.; Harding, Paul; Freeman, Kenneth C.; Norris, John; Shectman, Stephen A.

In: Astrophysical Journal, Vol. 555, No. 1 PART 2, 01.07.2001, p. L37-L40.

Research output: Contribution to journal › Article › peer-review

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AU - Morrison, Heather

AU - Mateo, Mario

AU - Olszewski, Edward W.

AU - Harding, Paul

AU - Freeman, Kenneth C.

AU - Norris, John

AU - Shectman, Stephen A.

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N2 - As part of the Spaghetti Project Survey, we have detected a concentration of giant stars well above expectations for a smooth halo model. The position (l ∼ 350°, b ∼ 50°) and distance (∼50 kpc) of this concentration match those of the northern overdensity detected by the Sloan Digital Sky Survey. We find additional evidence for structure at ∼80 kpc in the same direction. We present radial velocities for many of these stars, including the first published results from the 6.5 m Magellan telescope. The radial velocities for stars in these structures are in excellent agreement with models of the dynamical evolution of the Sagittarius dwarf tidal debris, whose center is 60° away. The metallicity of stars in these streams is lower than that of the main body of the Sgr dwarf, which may indicate a radial metallicity gradient prior to disruption.

AB - As part of the Spaghetti Project Survey, we have detected a concentration of giant stars well above expectations for a smooth halo model. The position (l ∼ 350°, b ∼ 50°) and distance (∼50 kpc) of this concentration match those of the northern overdensity detected by the Sloan Digital Sky Survey. We find additional evidence for structure at ∼80 kpc in the same direction. We present radial velocities for many of these stars, including the first published results from the 6.5 m Magellan telescope. The radial velocities for stars in these structures are in excellent agreement with models of the dynamical evolution of the Sagittarius dwarf tidal debris, whose center is 60° away. The metallicity of stars in these streams is lower than that of the main body of the Sgr dwarf, which may indicate a radial metallicity gradient prior to disruption.

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KW - Galaxy: Formation

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Mapping the galactic halo. V. Sagittarius dwarf spheroidal tidal debris 60° from the main body

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Keywords

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