A measurement of the hubble constant by the megamaser cosmology project

James Braatz; James Condon; Christian Henkel; Jenny Greene; Fred Lo; Mark Reid; Dominic Pesce; Feng Gao; Violette Impellizzeri; Cheng Yu Kuo; Wei Zhao; Anca Constantin; Lei Hao; Eugenia Litzinger

doi:10.1017/S1743921317010249

A measurement of the hubble constant by the megamaser cosmology project

James Braatz, James Condon, Christian Henkel, Jenny Greene, Fred Lo, Mark Reid, Dominic Pesce, Feng Gao, Violette Impellizzeri, Cheng Yu Kuo, Wei Zhao, Anca Constantin, Lei Hao, Eugenia Litzinger

Astrophysical Sciences

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

5 Scopus citations

Abstract

The Megamaser Cosmology Project (MCP) measures the Hubble Constant by determining geometric distances to circumnuclear 22 GHz H2O megamasers in galaxies at low redshift (z < 0.05) but well into the Hubble flow. In combination with the recent, exquisite observations of the Cosmic Microwave Background by WMAP and Planck, these measurements provide a direct test of the standard cosmological model and constrain the equation of state of dark energy. The MCP is a multi-year project that has recently completed observations and is currently working on final analysis. Based on distance measurements to the first four published megamasers in the sample, the MCP currently determines H0 = 69.3 ± 4.2 km s^-1 Mpc^-1. The project is finalizing analysis for five additional galaxies. When complete, we expect to achieve a ~4% measurement. Given the tension between the Planck prediction of H0 in the context of the standard cosmological model and astrophysical measurements based on standard candles, the MCP provides a critical and independent geometric measurement that does not rely on external calibrations or a distance ladder.

Original language	English (US)
Pages (from-to)	86-91
Number of pages	6
Journal	Proceedings of the International Astronomical Union
Volume	13
Issue number	S336
DOIs	https://doi.org/10.1017/S1743921317010249
State	Published - 2017

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

distance scale
masers

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10.1017/S1743921317010249

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title = "A measurement of the hubble constant by the megamaser cosmology project",

abstract = "The Megamaser Cosmology Project (MCP) measures the Hubble Constant by determining geometric distances to circumnuclear 22 GHz H2O megamasers in galaxies at low redshift (z < 0.05) but well into the Hubble flow. In combination with the recent, exquisite observations of the Cosmic Microwave Background by WMAP and Planck, these measurements provide a direct test of the standard cosmological model and constrain the equation of state of dark energy. The MCP is a multi-year project that has recently completed observations and is currently working on final analysis. Based on distance measurements to the first four published megamasers in the sample, the MCP currently determines H0 = 69.3 ± 4.2 km s-1 Mpc-1. The project is finalizing analysis for five additional galaxies. When complete, we expect to achieve a ~4% measurement. Given the tension between the Planck prediction of H0 in the context of the standard cosmological model and astrophysical measurements based on standard candles, the MCP provides a critical and independent geometric measurement that does not rely on external calibrations or a distance ladder.",

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author = "James Braatz and James Condon and Christian Henkel and Jenny Greene and Fred Lo and Mark Reid and Dominic Pesce and Feng Gao and Violette Impellizzeri and Kuo, {Cheng Yu} and Wei Zhao and Anca Constantin and Lei Hao and Eugenia Litzinger",

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year = "2017",

doi = "10.1017/S1743921317010249",

language = "English (US)",

volume = "13",

pages = "86--91",

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AU - Braatz, James

AU - Condon, James

AU - Henkel, Christian

AU - Greene, Jenny

AU - Lo, Fred

AU - Reid, Mark

AU - Pesce, Dominic

AU - Gao, Feng

AU - Impellizzeri, Violette

AU - Kuo, Cheng Yu

AU - Zhao, Wei

AU - Constantin, Anca

AU - Hao, Lei

AU - Litzinger, Eugenia

PY - 2017

Y1 - 2017

N2 - The Megamaser Cosmology Project (MCP) measures the Hubble Constant by determining geometric distances to circumnuclear 22 GHz H2O megamasers in galaxies at low redshift (z < 0.05) but well into the Hubble flow. In combination with the recent, exquisite observations of the Cosmic Microwave Background by WMAP and Planck, these measurements provide a direct test of the standard cosmological model and constrain the equation of state of dark energy. The MCP is a multi-year project that has recently completed observations and is currently working on final analysis. Based on distance measurements to the first four published megamasers in the sample, the MCP currently determines H0 = 69.3 ± 4.2 km s-1 Mpc-1. The project is finalizing analysis for five additional galaxies. When complete, we expect to achieve a ~4% measurement. Given the tension between the Planck prediction of H0 in the context of the standard cosmological model and astrophysical measurements based on standard candles, the MCP provides a critical and independent geometric measurement that does not rely on external calibrations or a distance ladder.

AB - The Megamaser Cosmology Project (MCP) measures the Hubble Constant by determining geometric distances to circumnuclear 22 GHz H2O megamasers in galaxies at low redshift (z < 0.05) but well into the Hubble flow. In combination with the recent, exquisite observations of the Cosmic Microwave Background by WMAP and Planck, these measurements provide a direct test of the standard cosmological model and constrain the equation of state of dark energy. The MCP is a multi-year project that has recently completed observations and is currently working on final analysis. Based on distance measurements to the first four published megamasers in the sample, the MCP currently determines H0 = 69.3 ± 4.2 km s-1 Mpc-1. The project is finalizing analysis for five additional galaxies. When complete, we expect to achieve a ~4% measurement. Given the tension between the Planck prediction of H0 in the context of the standard cosmological model and astrophysical measurements based on standard candles, the MCP provides a critical and independent geometric measurement that does not rely on external calibrations or a distance ladder.

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A measurement of the hubble constant by the megamaser cosmology project

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