SIMBAD references

2018ApJ...852...60J - Astrophys. J., 852, 60-60 (2018/January-1)

The Carnegie-Chicago Hubble Program. III. The distance to NGC 1365 via the Tip of the Red Giant Branch.

JANG I.S., HATT D., BEATON R.L., LEE M.G., FREEDMAN W.L., MADORE B.F., HOYT T.J., MONSON A.J., RICH J.A., SCOWCROFT V. and SEIBERT M.

Abstract (from CDS):

The Carnegie-Chicago Hubble Program (CCHP) seeks to anchor the distance scale of Type Ia supernovae via the Tip of the Red Giant Branch (TRGB) method. Based on deep Hubble Space Telescope ACS/WFC imaging, we present an analysis of the TRGB for the metal-poor halo of NGC 1365, a giant spiral galaxy in the Fornax cluster that was host to the Type Ia supernova SN 2012fr. We have measured the extinction-corrected TRGB magnitude of NGC 1365 to be F814W = 27.34 ± 0.03stat ± 0.04sys mag. In advance of future direct calibration by Gaia, we adopt a provisional I-band TRGB luminosity set at the Large Magellanic Cloud and find a true distance modulus µ0 = 31.29 ± 0.04stat ± 0.06sys mag or D = 18.1 ± 0.3stat ± 0.5sys Mpc. This measurement is in excellent agreement with recent Cepheid-based distances to NGC 1365 and reveals no significant difference in the distances derived from stars of Populations I and II for this galaxy. We revisit the error budget for the CCHP path to the Hubble constant based on the analysis presented here, i.e., that for one of the most distant Type Ia supernova hosts within our Program, and find that a 2.5% measurement is feasible with the current sample of galaxies and TRGB absolute calibration.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: distances and redshifts - galaxies: individual: NGC 1365 - stars: Population II - stars: Population II

Simbad objects: 9

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2019.10.21-01:02:18

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