THE CARNEGIE HUBBLE PROGRAM: The DISTANCE and STRUCTURE of the SMC AS REVEALED by MID-INFRARED OBSERVATIONS of CEPHEIDS

Victoria Scowcroft; Wendy L. Freedman; Barry F. Madore; Andy Monson; S. E. Persson; Jeff Rich; Mark Seibert; Jane R. Rigby

doi:10.3847/0004-637X/816/2/49

THE CARNEGIE HUBBLE PROGRAM: The DISTANCE and STRUCTURE of the SMC AS REVEALED by MID-INFRARED OBSERVATIONS of CEPHEIDS

Victoria Scowcroft, Wendy L. Freedman, Barry F. Madore, Andy Monson, S. E. Persson, Jeff Rich, Mark Seibert, Jane R. Rigby

Astronomy & Astrophysics

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132 Scopus citations

Abstract

Using Spitzer observations of classical Cepheids we have measured the true average distance modulus of the Small Magellanic Cloud (SMC) to be mag (corresponding to kpc), which is 0.48 ±0.01 mag more distant than the LMC. This is in agreement with previous results from Cepheid observations, as well as with measurements from other indicators such as RR Lyrae stars and the tip of the red giant branch. Utilizing the properties of the mid-infrared Leavitt Law we measured precise distances to individual Cepheids in the SMC, and have confirmed that the galaxy is tilted and elongated such that its eastern side is up to 20 kpc closer than its western side. This is in agreement with the results from red clump stars and dynamical simulations of the Magellanic Clouds and Stream.

Original language	English (US)
Article number	49
Journal	Astrophysical Journal
Volume	816
Issue number	2
DOIs	https://doi.org/10.3847/0004-637X/816/2/49
State	Published - Jan 10 2016

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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title = "THE CARNEGIE HUBBLE PROGRAM: The DISTANCE and STRUCTURE of the SMC AS REVEALED by MID-INFRARED OBSERVATIONS of CEPHEIDS",

abstract = "Using Spitzer observations of classical Cepheids we have measured the true average distance modulus of the Small Magellanic Cloud (SMC) to be mag (corresponding to kpc), which is 0.48 ±0.01 mag more distant than the LMC. This is in agreement with previous results from Cepheid observations, as well as with measurements from other indicators such as RR Lyrae stars and the tip of the red giant branch. Utilizing the properties of the mid-infrared Leavitt Law we measured precise distances to individual Cepheids in the SMC, and have confirmed that the galaxy is tilted and elongated such that its eastern side is up to 20 kpc closer than its western side. This is in agreement with the results from red clump stars and dynamical simulations of the Magellanic Clouds and Stream.",

author = "Victoria Scowcroft and Freedman, {Wendy L.} and Madore, {Barry F.} and Andy Monson and Persson, {S. E.} and Jeff Rich and Mark Seibert and Rigby, {Jane R.}",

year = "2016",

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doi = "10.3847/0004-637X/816/2/49",

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T2 - The DISTANCE and STRUCTURE of the SMC AS REVEALED by MID-INFRARED OBSERVATIONS of CEPHEIDS

AU - Scowcroft, Victoria

AU - Freedman, Wendy L.

AU - Madore, Barry F.

AU - Monson, Andy

AU - Persson, S. E.

AU - Rich, Jeff

AU - Seibert, Mark

AU - Rigby, Jane R.

PY - 2016/1/10

Y1 - 2016/1/10

N2 - Using Spitzer observations of classical Cepheids we have measured the true average distance modulus of the Small Magellanic Cloud (SMC) to be mag (corresponding to kpc), which is 0.48 ±0.01 mag more distant than the LMC. This is in agreement with previous results from Cepheid observations, as well as with measurements from other indicators such as RR Lyrae stars and the tip of the red giant branch. Utilizing the properties of the mid-infrared Leavitt Law we measured precise distances to individual Cepheids in the SMC, and have confirmed that the galaxy is tilted and elongated such that its eastern side is up to 20 kpc closer than its western side. This is in agreement with the results from red clump stars and dynamical simulations of the Magellanic Clouds and Stream.

AB - Using Spitzer observations of classical Cepheids we have measured the true average distance modulus of the Small Magellanic Cloud (SMC) to be mag (corresponding to kpc), which is 0.48 ±0.01 mag more distant than the LMC. This is in agreement with previous results from Cepheid observations, as well as with measurements from other indicators such as RR Lyrae stars and the tip of the red giant branch. Utilizing the properties of the mid-infrared Leavitt Law we measured precise distances to individual Cepheids in the SMC, and have confirmed that the galaxy is tilted and elongated such that its eastern side is up to 20 kpc closer than its western side. This is in agreement with the results from red clump stars and dynamical simulations of the Magellanic Clouds and Stream.

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THE CARNEGIE HUBBLE PROGRAM: The DISTANCE and STRUCTURE of the SMC AS REVEALED by MID-INFRARED OBSERVATIONS of CEPHEIDS

Abstract

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