TY - JOUR
T1 - The Carnegie-Chicago Hubble Program. IV. the Distance to NGC 4424, NGC 4526, and NGC 4356 via the Tip of the Red Giant Branch
AU - Hatt, Dylan
AU - Freedman, Wendy L.
AU - Madore, Barry F.
AU - Beaton, Rachael L.
AU - Hoyt, Taylor J.
AU - Jang, In Sung
AU - Lee, Myung Gyoon
AU - Monson, Andrew J.
AU - Rich, Jeffrey A.
AU - Scowcroft, Victoria
AU - Seibert, Mark
N1 - Funding Information:
We thank Peter Stetson for a copy of DAOPHOT as well as his helpful engagement on its usage. Support for this work was provided by NASA through Hubble Fellowship grant #51386.01 awarded 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. Authors M.G.L. and I.S.J. were supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) No. 2017R1A2B4004632. Support for program #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 NAS 5-26555. 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. Facility: HST (ACS/WFC).
Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved.
PY - 2018/7/10
Y1 - 2018/7/10
N2 - 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.
AB - 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.
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U2 - 10.3847/1538-4357/aac9cc
DO - 10.3847/1538-4357/aac9cc
M3 - Article
AN - SCOPUS:85050652306
SN - 0004-637X
VL - 861
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 104
ER -