THE DISTANCE TO M101 HOSTING TYPE Ia SUPERNOVA 2011fe BASED ON THE TIP OF THE RED GIANT BRANCH

Journal Article · Tue Nov 20 04:00:00 EST 2012 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/760/1/L14· OSTI ID:22078417

Lee, Myung Gyoon

We present a new determination of the distance to M101, host of the Type Ia supernova (SN Ia) 2011fe, based on the tip of the red giant branch (TRGB) method. Our determination is based on Hubble Space Telescope archival F555W and F814W images of nine fields within the galaxy. Color-magnitude diagrams of arm-free regions in all fields show a prominent red giant branch. We measure the I-band magnitudes of the TRGB, obtaining a mean value of I{sub TRGB} = 25.28 {+-} 0.01 (where the error is a standard error), using an edge-detection method. We derive a weighted mean value of distance modulus (m - M){sub 0} = 29.30 {+-} 0.01(random) {+-} 0.12(systematic), corresponding to a linear distance of 7.24 {+-} 0.03 {+-} 0.40 Mpc. While previous estimates for M101 show a large range (TRGB distances of (m - M){sub 0} = 29.05-29.42 and Cepheid distances of (m - M){sub 0} = 29.04-29.71), our measurements of the TRGB distances for nine fields show a small dispersion of only 0.02. We combine our distance estimate and photometry in the literature to derive absolute peak magnitudes in optical and near-infrared bands of SN 2011fe. Absolute maximum magnitudes of SN 2011fe are {approx}0.2 mag brighter in the optical band and much more in the NIR than the current calibrations of SNe Ia in the literature. From the optical maximum magnitudes of SN 2011fe we obtain a value of the Hubble constant, H{sub 0} = 65.0 {+-} 0.5(random) {+-} 5.7(systematic) km s{sup -1} Mpc{sup -1}, slightly smaller than other recent determinations of H{sub 0}.

• OSTI ID: 22078417
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 760; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CALIBRATION
COLOR
DIAGRAMS
DISTANCE
ERRORS
GALAXIES
MEASURING METHODS
PHOTOMETRY
SUPERNOVAE
TELESCOPES