NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T02:23:56 PDT
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For refcode 2014ApJ...784L..11Y:
Retrieve 17 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2014ApJ...784L..11Y A New Method for Measuring Extragalactic Distances Yoshii, Yuzuru; Kobayashi, Yukiyasu; Minezaki, Takeo; Koshida, Shintaro; Peterson, Bruce A. Abstract. We have pioneered a new method for the measurement of extragalactic distances. This method uses the time lag between variations in the short wavelength and long wavelength light from an active galactic nucleus (AGN), based on a quantitative physical model of dust reverberation that relates the time lag to the absolute luminosity of the AGN. We use the large homogeneous data set from intensive monitoring observations in optical and near-infrared wavelength bands with the dedicated 2 m MAGNUM telescope to obtain the distances to 17 AGNs in the redshift range z = 0.0024 to z = 0.0353. These distance measurements are compared with distances measured using Cepheid variable stars, and are used to infer that H_0_ = 73 +/- 3 (random) km s^-1^ Mpc^-1^. The systematic error in H_0_ is examined, and the uncertainty in the size distribution of dust grains is the largest source of the systematic error, which is much reduced for a sample of AGNs for which their parameter values in the model of dust reverberation are individually measured. This AGN time lag method can be used beyond 30 Mpc, the farthest distance reached by extragalactic Cepheids, and can be extended to high-redshift quasi-stellar objects. Key words: cosmological parameters, dust, extinction, galaxies: active, galaxies: Seyfert
Retrieve 17 NED objects in this reference.
Please click here for ADS abstract

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