The Carnegie Chicago Hubble Program. VI. Tip of the Red Giant Branch Distances to M66 and M96 of the Leo i Group

Taylor J. Hoyt; Wendy L. Freedman; Barry F. Madore; Dylan Hatt; Rachael L. Beaton; In Sung Jang; Myung Gyoon Lee; Andrew J. Monson; Jillian R. Neeley; Jeffrey A. Rich; Violet A. Mager

doi:10.3847/1538-4357/ab1f81

The Carnegie Chicago Hubble Program. VI. Tip of the Red Giant Branch Distances to M66 and M96 of the Leo i Group

Taylor J. Hoyt
, Wendy L. Freedman
, Barry F. Madore
, Dylan Hatt
, Rachael L. Beaton
, In Sung Jang
, Myung Gyoon Lee
, Andrew J. Monson
, Jillian R. Neeley
, Jeffrey A. Rich
, Violet A. Mager

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

19 Scopus citations

Abstract

We determine the distances to the Type Ia supernova host galaxies M66 (NGC 3627) and M96 (NGC 3368) of the Leo I Group using the Tip of the Red Giant Branch (TRGB) method. We target the stellar halos of these galaxies using the Hubble Space Telescope ACS/WFC in the F606W and F814W bandpasses. By pointing to the stellar halos we sample RGB stars predominantly of Population II, minimize host-galaxy reddening, and significantly reduce the effects of source crowding. Our absolute calibration of the I-band TRGB is based on a recent detached eclipsing binary distance to the Large Magellanic Cloud. With this geometric zero-point in hand, we find for M66 and M96, respectively, true distance moduli μ ₀ = 30.23 ± 0.04 (stat) ± 0.06 (sys) mag and μ ₀ = 30.29 ± 0.02 (stat) ± 0.06 (sys) mag.

Original language	English (US)
Article number	150
Journal	Astrophysical Journal
Volume	882
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/ab1f81
State	Published - Sep 10 2019
Externally published	Yes

Keywords

Distance scale-galaxies: Individual (m66
M96)-galaxies: Stellar content-stars: Population II

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/ab1f81

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@article{c5bccdd9fdea44dea3a55422c9cf2174,

title = "The Carnegie Chicago Hubble Program. VI. Tip of the Red Giant Branch Distances to M66 and M96 of the Leo i Group",

abstract = "We determine the distances to the Type Ia supernova host galaxies M66 (NGC 3627) and M96 (NGC 3368) of the Leo I Group using the Tip of the Red Giant Branch (TRGB) method. We target the stellar halos of these galaxies using the Hubble Space Telescope ACS/WFC in the F606W and F814W bandpasses. By pointing to the stellar halos we sample RGB stars predominantly of Population II, minimize host-galaxy reddening, and significantly reduce the effects of source crowding. Our absolute calibration of the I-band TRGB is based on a recent detached eclipsing binary distance to the Large Magellanic Cloud. With this geometric zero-point in hand, we find for M66 and M96, respectively, true distance moduli μ 0 = 30.23 ± 0.04 (stat) ± 0.06 (sys) mag and μ 0 = 30.29 ± 0.02 (stat) ± 0.06 (sys) mag.",

keywords = "Distance scale-galaxies: Individual (m66, M96)-galaxies: Stellar content-stars: Population II",

author = "Hoyt, \{Taylor J.\} and Freedman, \{Wendy L.\} and Madore, \{Barry F.\} and Dylan Hatt and Beaton, \{Rachael L.\} and Jang, \{In Sung\} and Lee, \{Myung Gyoon\} and Monson, \{Andrew J.\} and Neeley, \{Jillian R.\} and Rich, \{Jeffrey A.\} and Mager, \{Violet A.\}",

year = "2019",

month = sep,

day = "10",

doi = "10.3847/1538-4357/ab1f81",

language = "English (US)",

volume = "882",

journal = "Astrophysical Journal",

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AU - Hoyt, Taylor J.

AU - Freedman, Wendy L.

AU - Madore, Barry F.

AU - Hatt, Dylan

AU - Beaton, Rachael L.

AU - Jang, In Sung

AU - Lee, Myung Gyoon

AU - Monson, Andrew J.

AU - Neeley, Jillian R.

AU - Rich, Jeffrey A.

AU - Mager, Violet A.

PY - 2019/9/10

Y1 - 2019/9/10

N2 - We determine the distances to the Type Ia supernova host galaxies M66 (NGC 3627) and M96 (NGC 3368) of the Leo I Group using the Tip of the Red Giant Branch (TRGB) method. We target the stellar halos of these galaxies using the Hubble Space Telescope ACS/WFC in the F606W and F814W bandpasses. By pointing to the stellar halos we sample RGB stars predominantly of Population II, minimize host-galaxy reddening, and significantly reduce the effects of source crowding. Our absolute calibration of the I-band TRGB is based on a recent detached eclipsing binary distance to the Large Magellanic Cloud. With this geometric zero-point in hand, we find for M66 and M96, respectively, true distance moduli μ 0 = 30.23 ± 0.04 (stat) ± 0.06 (sys) mag and μ 0 = 30.29 ± 0.02 (stat) ± 0.06 (sys) mag.

AB - We determine the distances to the Type Ia supernova host galaxies M66 (NGC 3627) and M96 (NGC 3368) of the Leo I Group using the Tip of the Red Giant Branch (TRGB) method. We target the stellar halos of these galaxies using the Hubble Space Telescope ACS/WFC in the F606W and F814W bandpasses. By pointing to the stellar halos we sample RGB stars predominantly of Population II, minimize host-galaxy reddening, and significantly reduce the effects of source crowding. Our absolute calibration of the I-band TRGB is based on a recent detached eclipsing binary distance to the Large Magellanic Cloud. With this geometric zero-point in hand, we find for M66 and M96, respectively, true distance moduli μ 0 = 30.23 ± 0.04 (stat) ± 0.06 (sys) mag and μ 0 = 30.29 ± 0.02 (stat) ± 0.06 (sys) mag.

KW - Distance scale-galaxies: Individual (m66

KW - M96)-galaxies: Stellar content-stars: Population II

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ER -

The Carnegie Chicago Hubble Program. VI. Tip of the Red Giant Branch Distances to M66 and M96 of the Leo i Group

Abstract

Keywords

ASJC Scopus subject areas

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