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10 papers
Absolute Calibration of Cepheid Period-Luminosity Relations in NGC 4258
Wenlong Yuan, Lucas M. Macri, Adam G. Riess +6
NGC 4258 is one of the most important anchors for calibrating the Cepheid period--luminosity relations (PLRs) owing to its accurate distance measured from water maser motions. We e…
A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
Adam G. Riess, Wenlong Yuan, Lucas M. Macri +15
We report observations from HST of Cepheids in the hosts of 42 SNe Ia used to calibrate the Hubble constant (H0). These include all suitable SNe Ia in the last 40 years at z<0.01,…
The Cepheid Distance to the Narrow-Line Seyfert 1 Galaxy NGC 4051
Wenlong Yuan, Lucas M. Macri, Bradley M. Peterson +15
We derive a distance of ~Mpc (~mag) to the archetypal narrow-line Seyfert 1 galaxy NGC 4051 based on Cepheid Period--Luminosity relations and new…
The Cepheid Distance to the Seyfert 1 Galaxy NGC 4151
Wenlong Yuan, Michael M. Fausnaugh, Samantha L. Hoffmann +15
We derive a distance of Mpc to the archetypical Seyfert 1 galaxy NGC 4151 based on the near-infrared Cepheid Period-Luminosity relation and new Hubble Space Telescope…
Hubble Space Telescope Observations of Mira Variables in the Type Ia Supernova Host NGC 1559: An Alternative Candle to Measure the Hubble Constant
Caroline D. Huang, Adam G. Riess, Wenlong Yuan +7
We present year-long, near-infrared Hubble Space Telescope WFC3 observations used to search for Mira variables in NGC 1559, the host galaxy of the Type Ia supernova (SN Ia) 2005df.…
Significant Luminosity Differences of Two Twin Type Ia Supernovae
Ryan J. Foley, Samantha L. Hoffmann, Lucas M. Macri +5
The Type Ia supernovae (SNe Ia) 2011by, hosted in NGC 3972, and 2011fe, hosted in M101, are optical "twins," having almost identical optical light-curve shapes, colours, and near-m…