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| DOI | 10.3847/1538-4357/AB2F73 | ||||
| Año | 2019 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
We present a new and independent determination of the local value of the Hubble constant based on a calibration of the tip of the red giant branch (TRGB) applied to Type Ia supernovae (SNe Ia). We find a value of H-0 = 69.8 +/- 0.8 (+/- 1.1% stat) +/- 1.7 (+/- 2.4% sys) km s(-1) Mpc(-1). The TRGB method is both precise and accurate and is parallel to but independent of the Cepheid distance scale. Our value sits midway in the range defined by the current Hubble tension. It agrees at the 1.2 sigma level with that of the Planck Collaboration et al. estimate and at the 1.7 sigma level with the Hubble Space Telescope (HST) SHoES measurement of H-0 based on the Cepheid distance scale. The TRGB distances have been measured using deep HST Advanced Camera for Surveys imaging of galaxy halos. The zero-point of the TRGB calibration is set with a distance modulus to the Large Magellanic Cloud of 18.477 +/- 0.004 (stat) +/- 0.020 (sys) mag, based on measurement of 20 late-type detached eclipsing binary stars, combined with an HSTparallax calibration of a 3.6 mu m Cepheid Leavitt law based on Spitzer observations. We anchor the TRGB distances to galaxies that extend our measurement into the Hubble flow using the recently completed Carnegie Supernova Project I (CSP-I) sample containing about 100 well-observed SNe Ia . There are several advantages of halo TRGB distance measurements relative to Cepheid variables; these include low halo reddening, minimal effects of crowding or blending of the photometry, only a shallow (calibrated) sensitivity to metallicity in the I band, and no need for multiple epochs of observations or concerns of different slopes with period. In addition, the host masses of our TRGB host-galaxy sample are higher, on average, than those of the Cepheid sample, better matching the range of host-galaxy masses in the CSP-I distant sample and reducing potential systematic effects in the SNe Ia measurements.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Freedman, Wendy L. | Mujer |
UNIV CHICAGO - Estados Unidos
The University of Chicago - Estados Unidos |
| 2 | Madore, B. F. | Hombre |
Carnegie Inst Sci - Estados Unidos
Observatorio Las Campanas - Estados Unidos |
| 3 | Hatt, Dylan | Hombre |
UNIV CHICAGO - Estados Unidos
The University of Chicago - Estados Unidos |
| 4 | Hoyt, Taylor J. | Hombre |
UNIV CHICAGO - Estados Unidos
The University of Chicago - Estados Unidos |
| 5 | Jang, In Sung | - |
Leibniz Inst Astrophys Potsdam - Alemania
Leibniz Institute for Astrophysics Potsdam - Alemania |
| 6 | Beaton, R. L. | Mujer |
Princeton Univ - Estados Unidos
Princeton University - Estados Unidos |
| 7 | Burns, C. | Hombre |
Carnegie Inst Sci - Estados Unidos
Observatorio Las Campanas - Estados Unidos |
| 8 | Lee, Myung Gyoon | - |
Seoul Natl Univ - Corea del Sur
Seoul National University - Corea del Sur |
| 9 | Monson, Andrew | Hombre |
PENN STATE UNIV - Estados Unidos
Pennsylvania State University - Estados Unidos |
| 10 | Neeley, Jillian R. | Mujer |
Florida Atlantic Univ - Estados Unidos
FLORIDA ATLANTIC UNIVERSITY - Estados Unidos |
| 11 | Phillips, Mark M. | Hombre |
Carnegie Inst Sci - Chile
Las Campanas Observatory - Chile Carnegie Inst Washington - Chile |
| 12 | Rich, J. A. | Hombre |
Carnegie Inst Sci - Estados Unidos
Observatorio Las Campanas - Estados Unidos |
| 13 | Seibert, Mark | Hombre |
Carnegie Inst Sci - Estados Unidos
Observatorio Las Campanas - Estados Unidos |
| Fuente |
|---|
| National Science Foundation |
| NASA |
| National Aeronautics and Space Administration |
| University of Chicago |
| NASA through Space Telescope Science Institute |
| Ahmanson Foundation |
| Observatories of the Carnegie Institution for Science |
| NASA through Hubble Fellowship by the Space Telescope Science Institute |
| National Research Foundation (NRF) of Korea - Korean Government |
| Agradecimiento |
|---|
| Support for program No. 13691 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NASA 5-26555. The CSP-I has been supported by the National Science Foundation under grants AST 0306969, AST 0607438, AST 1008343, AST 1613426, and AST 1613472. M. G. L. is supported by a grant from the National Research Foundation (NRF) of Korea, funded by the Korean Government (NRF-2017R1A2B4004632). Partial support for this work was provided by NASA through Hubble Fellowship grant No. 51386.01 to R. L. B. by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA under contract NAS 5-26555. Computing resources used for this work were made possible by a grant from the Ahmanson Foundation. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). The STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. We thank the Observatories of the Carnegie Institution for Science and the University of Chicago for their support of our longterm research into the calibration and determination of the expansion rate of the universe. We gratefully acknowledge Vicky Scowcroft for her early contributions to the project. W. L. F. thanks Stanford University for two visits, during which time part of this paper was written. We thank Adam Riess for helpful correspondence concerning the LMC calibration. We also thank the anonymous referee for constructive comments. |