Published September 1, 2014 | Version v1
Journal article

The Tip of the red giant branch distance to the perfect spiral galaxy M74 hosting three core-collapse supernovae

  • 1. Astronomy Program, Department of Physics and Astronomy, Seoul National University, Gwanak-gu, Seoul 151-742 (Korea, Republic of)

Description

M74 (NGC 628) is a famous face-on spiral galaxy, hosting three core-collapse supernovae (SNe): SN Ic 2002ap, SN II-P 2003gd, and SN II-P 2013ej. However, its distance is not well known. We present a distance estimation for this galaxy based on the Tip of the Red Giant Branch (TRGB) method. We obtain photometry of the resolved stars in the arm-free region of M74 from F555W and F814W images in the Hubble Space Telescope archive. The color-magnitude diagram of the resolved stars shows a dominant red giant branch (RGB) as well as blue main sequence stars, red helium burning stars, and asymptotic giant branch stars. The I-band luminosity function of the RGB stars shows the TRGB to be at I TRGB = 26.13 ± 0.03 mag, and T RGB = 25.97 ± 0.03. From this, we derive the distance modulus to M74 to be 30.04 ± 0.04 (random) ± 0.12 (systematic) (corresponding to a linear distance of 10.19 ± 0.14 ± 0.56 Mpc). With this distance estimate, we calibrate the standardized candle method for SNe II-P. From the absolute magnitudes of SN 2003gd, we derive a value of the Hubble constant, H 0 = 72 ± 6 (random) ± 7 (systematic) km s–1 Mpc–1. It is similar to recent estimates based on the luminosity calibration of Type Ia supernovae.

Availability note (English)

Available from http://dx.doi.org/10.1088/0004-637X/792/1/52

Additional details

Identifiers

Publishing Information

Journal Title
Astrophysical Journal
Journal Volume
792
Journal Issue
1
Journal Page Range
[6 p.]
ISSN
0004-637X
CODEN
ASJOAB