The Carnegie-Chicago Hubble Program. IV. the Distance to NGC 4424, NGC 4526, and NGC 4356 via the Tip of the Red Giant Branch

Dylan Hatt, Wendy L. Freedman, Barry F. Madore, Rachael L. Beaton, Taylor J. Hoyt, In Sung Jang, Myung Gyoon Lee, Andrew J. Monson, Jeffrey A. Rich, Victoria Scowcroft, Mark Seibert

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The Carnegie-Chicago Hubble Program is undertaking a re-calibration of the extragalactic distance scale, using SNe Ia that are tied to Tip of the Red Giant Branch (TRGB) distances to local galaxies. We present here deep Hubble Space Telescope ACS/WFC imaging of the resolved stellar populations in the metal-poor halos of the SN Ia-host galaxies NGC 4424, NGC 4526, and NGC 4536. These three Virgo constellation galaxies are prime targets for calibrating the extragalactic distance scale given their relative proximity in the local universe and their low line-of-sight reddenings. Anchoring the TRGB zero-point to the geometric distance to the Large Magellanic Cloud via detached eclipsing binaries, we measure extinction-corrected distance moduli of 31.00 ±0.03stat ±0.06sys mag, 30.98 ±0.03stat ±0.06sys mag, and 30.99 ±0.03stat ±0.06sys mag for NGC 4424, NGC 4526, and NGC 4536, respectively, or 15.8 ±0.2stat ±0.4sys Mpc, 15.7 ±0.2stat ±0.4sys Mpc, and 15.8 ±0.2stat ±0.4sys Mpc. For these three galaxies, the distances are the first that are based on the TRGB, and for NGC 4424 and NGC 4526, they are the highest-precision distances published to date, each measured to 3%. Finally, we report good agreement between our TRGB distances and the available Cepheid distances for NGC 4424 and NGC 4536, demonstrating consistency between the distance scales currently derived from stars of Population I and II.

Original languageEnglish (US)
Article number104
JournalAstrophysical Journal
Volume861
Issue number2
DOIs
StatePublished - Jul 10 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'The Carnegie-Chicago Hubble Program. IV. the Distance to NGC 4424, NGC 4526, and NGC 4356 via the Tip of the Red Giant Branch'. Together they form a unique fingerprint.

Cite this