# The Megamaser Cosmology Project. XIII. Combined Hubble Constant Constraints

@article{Pesce2020TheMC,
title={The Megamaser Cosmology Project. XIII. Combined Hubble Constant Constraints},
author={Dominic W. Pesce and James A. Braatz and Mark J. Reid and Adam G. Riess and Daniel M. Scolnic and James J. Condon and Feng Gao and Christian Henkel and C. M. Violette Impellizzeri and C. Y. Kuo and Kuang Yao Lo},
journal={The Astrophysical Journal Letters},
year={2020},
volume={891}
}
• Published 24 January 2020
• Physics
• The Astrophysical Journal Letters
We present a measurement of the Hubble constant made using geometric distance measurements to megamaser-hosting galaxies. We have applied an improved approach for fitting maser data and obtained better distance estimates for four galaxies previously published by the Megamaser Cosmology Project: UGC 3789, NGC 6264, NGC 6323, and NGC 5765b. Combining these updated distance measurements with those for the maser galaxies CGCG 074-064 and NGC 4258, and assuming a fixed velocity uncertainty of 250 km…
160 Citations

### A measurement of the Hubble constant from Type II supernovae

• Physics
• 2020
Progressive increases in the precision of the Hubble-constant measurement via Cepheid-calibrated Type Ia supernovae (SNe Ia) have shown a discrepancy of $\sim 4.4\sigma$ with the current value

### Measuring H0 using X-ray and SZ effect observations of dynamically relaxed galaxy clusters

• Physics
Monthly Notices of the Royal Astronomical Society
• 2021
We use a sample of 14 massive, dynamically relaxed galaxy clusters to constrain the Hubble constant, H0, by combining X-ray and Sunyaev–Zel’dovich (SZ) effect signals measured with Chandra, Planck,

### TDCOSMO IV: Hierarchical time-delay cosmography -- joint inference of the Hubble constant and galaxy density profiles

• Physics
• 2020
The H0LiCOW collaboration inferred via gravitational lensing time delays a Hubble constant $H_0=73.3^{+1.7}_{-1.8}$ km s$^{-1}{\rm Mpc}^{-1}$, describing deflector mass density profiles by either a

### A new measurement of the Hubble constant using Type Ia supernovae calibrated with surface brightness fluctuations

• Physics
Astronomy & Astrophysics
• 2020
We present a new calibration of the peak absolute magnitude of Type Ia supernovae (SNe Ia) based on the surface brightness fluctuations (SBF) method, aimed at measuring the value of the Hubble

### The Hubble Constant from Infrared Surface Brightness Fluctuation Distances

• Physics
The Astrophysical Journal
• 2021
We present a measurement of the Hubble constant H 0 from surface brightness fluctuation (SBF) distances for 63 bright, mainly early-type galaxies out to 100 Mpc observed with the WFC3/IR on the

### Toward a concordance teleparallel Cosmology I: Background Dynamics

• Physics
• 2020
Assuming the universe to be spatially flat with homogeneous and isotropic background, we study the cosmological viability of the infrared corrected $f(T)=T e^{\beta T_0/T}$ teleparallel gravity in

### Parameter interplay of CMB temperature, space curvature, and expansion rate

• Physics
• 2020
The cosmic microwave background (CMB) temperature, $T$, surely the most precisely measured cosmological parameter, has been inferred from {\it local} measurements of the blackbody spectrum to an

### Inspecting the Cepheid Distance Ladder: the Hubble Space Telescope Distance to the SN Ia Host Galaxy NGC 5584

• Physics
The Astrophysical Journal
• 2021
The current tension between the direct and the early-universe measurements of the Hubble constant, H 0, requires detailed scrutiny of all the data and methods used in the studies on both sides of the

### Combined analysis of Planck and SPTPol data favors the early dark energy models

• Physics
Journal of Cosmology and Astroparticle Physics
• 2020
We study the implications of the Planck temperature power spectrum at low multipoles, 0ℓ<100, and SPTPol data. We show that this combination predicts consistent lensing-induced smoothing of acoustic

### TDCOSMO

• Physics
Astronomy & Astrophysics
• 2020
The H0LiCOW collaboration inferred via strong gravitational lensing time delays a Hubble constant value of H0 = 73.3−1.8+1.7 km s−1 Mpc−1, describing deflector mass density profiles by either a

## References

SHOWING 1-10 OF 59 REFERENCES

### THE MEGAMASER COSMOLOGY PROJECT. IV. A DIRECT MEASUREMENT OF THE HUBBLE CONSTANT FROM UGC 3789

• Physics
• 2013
In Papers I and II from the Megamaser Cosmology Project, we reported initial observations of H2O masers in an accretion disk of a supermassive black hole at the center of the galaxy UGC 3789, which

### THE MEGAMASER COSMOLOGY PROJECT. V. AN ANGULAR-DIAMETER DISTANCE TO NGC 6264 AT 140 Mpc

• Physics
• 2013
We present the direct measurement of the Hubble constant, yielding the direct measurement of the angular-diameter distance to NGC 6264 using the H2O megamaser technique. Our measurement is based on

### THE MEGAMASER COSMOLOGY PROJECT. II. THE ANGULAR-DIAMETER DISTANCE TO UGC 3789

• Physics
• 2010
The Megamaser Cosmology Project (MCP) aims to determine H0 by measuring angular-diameter distances to galaxies in the Hubble flow using observations of water vapor megamasers in the circumnuclear

### The megamaser cosmology project. I. very long baseline interferometric observations of UGC 3789

• Physics
• 2009
The Megamaser Cosmology Project (MCP) seeks to measure the Hubble Constant (H0) in order to improve the extragalactic distance scale and constrain the nature of dark energy. We are searching for

### The Megamaser Cosmology Project: I. VLBI observations of UGC 3789

• Physics
• 2008
The Megamaser Cosmology Project (MCP) seeks to measure the Hubble Constant (H0 ) in order to improve the extragalactic distance scale and constrain the nature of dark energy. We are searching for

### THE MEGAMASER COSMOLOGY PROJECT. IX. BLACK HOLE MASSES FOR THREE MASER GALAXIES

• Physics
• 2016
As part of the Megamaser Cosmology Project, we present VLBI maps of nuclear water masers toward five galaxies. The masers originate in sub-parsec circumnuclear disks. For three of the galaxies, we

### Measuring Supermassive Black Hole Peculiar Motion Using H2O Megamasers

• Physics, Geology
The Astrophysical Journal
• 2018
H2O megamasers residing in the accretion disks of active galactic nuclei (AGNs) exhibit Keplerian rotation about the central supermassive black hole (SMBH). Such disk maser systems are excellent

### An Improved Distance to NGC 4258 and Its Implications for the Hubble Constant

• Physics
The Astrophysical Journal
• 2019
NGC 4258 is a critical galaxy for establishing the extragalactic distance scale and estimating the Hubble constant ( ). Water masers in the nucleus of the galaxy orbit about its supermassive black

### THE MEGAMASER COSMOLOGY PROJECT. III. ACCURATE MASSES OF SEVEN SUPERMASSIVE BLACK HOLES IN ACTIVE GALAXIES WITH CIRCUMNUCLEAR MEGAMASER DISKS

• Physics
• 2010
Observations of H2O masers from circumnuclear disks in active galaxies for the Megamaser Cosmology Project (MCP) allow accurate measurement of the mass of supermassive black holes (BH) in these

### Investigating Dark Energy with Observations of H 2 O Megamasers

• Physics
• 2008
As a complement to cosmic microwave background data, a determination of the Hubble constant (H0) to better than ∼ 3% would provide a powerful constraint on the equation of state of dark energy.