Search Results - "Freedman, Wendy L"

Measurements of the Hubble Constant: Tensions in Perspective by Freedman, Wendy L.

“…Abstract Measurement of the distances to nearby galaxies has improved rapidly in recent decades. The ever-present challenge is to reduce systematic effects,…”
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Calibration of the Tip of the Red Giant Branch by Freedman, Wendy L., Madore, Barry F., Hoyt, Taylor, Jang, In Sung, Beaton, Rachael, Lee, Myung Gyoon, Monson, Andrew, Neeley, Jill, Rich, Jeffrey

“…The tip of the red giant branch (TRGB) method provides one of the most accurate and precise means of measuring the distances to nearby galaxies. Here we…”
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The Carnegie-Chicago Hubble Program. VIII. An Independent Determination of the Hubble Constant Based on the Tip of the Red Giant Branch by Freedman, Wendy L., Madore, Barry F., Hatt, Dylan, Hoyt, Taylor J., Jang, In Sung, Beaton, Rachael L., Burns, Christopher R., Lee, Myung Gyoon, Monson, Andrew J., Neeley, Jillian R., Phillips, M. M., Rich, Jeffrey A., Seibert, Mark

“…Abstract We present a new and independent determination of the local value of the Hubble constant based on a calibration of the tip of the red giant branch…”
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The Hubble Constant by Freedman, Wendy L, Madore, Barry F

“…Considerable progress has been made in determining the Hubble constant over the past two decades. We discuss the cosmological context and importance of an…”
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Systematics in the Cepheid and TRGB Distance Scales: Metallicity Sensitivity of the Wesenheit Leavitt Law by Madore, Barry F., Freedman, Wendy L.

“…Abstract Using an updated and significantly augmented sample of Cepheid and tip of the red giant branch (TRGB) distances to 28 nearby spiral and irregular…”
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Erratum: “Systematics in the Cepheid and TRGB Distance Scales: Metallicity Sensitivity of the Wesenheit Leavitt Law” (2024, ApJ, 961, 166) by Madore, Barry F., Freedman, Wendy L.

“…Updates and corrections are made to a number of numerical entries and their references in Table 1 of the published article. Updated plots of the final run of…”
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CARNEGIE HUBBLE PROGRAM: A MID-INFRARED CALIBRATION OF THE HUBBLE CONSTANT by FREEDMAN, Wendy L, MADORE, Barry F, SCOWCROFT, Victoria, BURNS, Chris, MONSON, Andy, PERSSON, S. Eric, SEIBERT, Mark, RIGBY, Jane

“…Using a mid-infrared calibration of the Cepheid distance scale based on recent observations at 3.6 mu m with the Spitzer Space Telescope, we have obtained a…”
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THE CARNEGIE HUBBLE PROGRAM: THE DISTANCE AND STRUCTURE OF THE SMC AS REVEALED BY MID-INFRARED OBSERVATIONS OF CEPHEIDS by Scowcroft, Victoria, Freedman, Wendy L., Madore, Barry F., Monson, Andy, Persson, S. E., Rich, Jeff, Seibert, Mark, Rigby, Jane R.

“…ABSTRACT Using Spitzer observations of classical Cepheids we have measured the true average distance modulus of the Small Magellanic Cloud (SMC) to be mag…”
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The Carnegie Supernova Project: Absolute Calibration and the Hubble Constant by Burns, Christopher R., Parent, Emilie, Phillips, M. M., Stritzinger, Maximilian, Krisciunas, Kevin, Suntzeff, Nicholas B., Hsiao, Eric Y., Contreras, Carlos, Anais, Jorge, Boldt, Luis, Busta, Luis, Campillay, Abdo, Castellón, Sergio, Folatelli, Gastón, Freedman, Wendy L., González, Consuelo, Hamuy, Mario, Heoflich, Peter, Krzeminski, Wojtek, Madore, Barry F., Morrell, Nidia, Persson, S. E., Roth, Miguel, Salgado, Francisco, Serón, Jacqueline, Torres, Simón

“…We present an analysis of the final data release of the Carnegie Supernova Project I, focusing on the absolute calibration of the luminosity-decline rate…”
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Quantifying Uncertainties on the Tip of the Red Giant Branch Method by Madore, Barry F., Freedman, Wendy L., Owens, Kayla A., Jang, In Sung

“…Abstract We present an extensive grid of numerical simulations quantifying the uncertainties in measurements of the tip of the red giant branch (TRGB). These…”
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The Cepheid Distance Scale: A Novel Method for Obtaining Mean Magnitudes from Single-epoch Observations by Madore, Barry F., Freedman, Wendy L., Owens, Kayla

“…Abstract We present a novel technique for mapping single-phase observations of Cepheids in any given band into their time-averaged values, using strong priors…”
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Astrophysical Distance Scale. VII. A Self-consistent, Multiwavelength Calibration of the Slopes and Relative Zero Points for the Run of Luminosity with the Color of Stars Defining the Tip of the Red Giant Branch by Madore, Barry F., Freedman, Wendy L., Owens, Kayla

“…Abstract Given the recent successful launch of the James Webb Space Telescope, determining robust calibrations of the slopes and absolute magnitudes of the…”
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Standard Galactic field RR Lyrae II: a Gaia DR2 calibration of the period–Wesenheit–metallicity relation by Neeley, Jillian R, Marengo, Massimo, Freedman, Wendy L, Madore, Barry F, Beaton, Rachael L, Hatt, Dylan, Hoyt, Taylor, Monson, Andrew J, Rich, Jeffrey A, Sarajedini, Ata, Seibert, Mark, Scowcroft, Victoria

“…ABSTRACT RR Lyrae stars have long been popular standard candles, but significant advances in methodology and technology have been made in recent years to…”
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Type II Supernova Spectral Diversity. I. Observations, Sample Characterization, and Spectral Line Evolution by Gutiérrez, Claudia P., Anderson, Joseph P., Hamuy, Mario, Morrell, Nidia, González-Gaitan, Santiago, Stritzinger, Maximilian D., Phillips, Mark M., Galbany, Lluis, Folatelli, Gastón, Dessart, Luc, Contreras, Carlos, Valle, Massimo Della, Freedman, Wendy L., Hsiao, Eric Y., Krisciunas, Kevin, Madore, Barry F., Maza, José, Suntzeff, Nicholas B., Prieto, Jose Luis, González, Luis, Cappellaro, Enrico, Navarrete, Mauricio, Pizzella, Alessandro, Ruiz, Maria T., Smith, R. Chris, Turatto, Massimo

“…Abstract We present 888 visual-wavelength spectra of 122 nearby type II supernovae (SNe II) obtained between 1986 and 2009, and ranging between 3 and 363 days…”
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THE CARNEGIE-CHICAGO HUBBLE PROGRAM. I. AN INDEPENDENT APPROACH TO THE EXTRAGALACTIC DISTANCE SCALE USING ONLY POPULATION II DISTANCE INDICATORS by Beaton, Rachael L., Freedman, Wendy L., Madore, Barry F., Bono, Giuseppe, Carlson, Erika K., Clementini, Gisella, Durbin, Meredith J., Garofalo, Alessia, Hatt, Dylan, Jang, In Sung, Kollmeier, Juna A., Lee, Myung Gyoon, Monson, Andrew J., Rich, Jeffrey A., Scowcroft, Victoria, Seibert, Mark, Sturch, Laura, Yang, Soung-Chul

“…ABSTRACT We present an overview of the Carnegie-Chicago Hubble Program, an ongoing program to obtain a 3% measurement of the Hubble constant ( H 0 ) using…”
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The Carnegie–Chicago Hubble Program. III. The Distance to NGC 1365 via the Tip of the Red Giant Branch by Jang, In Sung, Hatt, Dylan, Beaton, Rachael L., Lee, Myung Gyoon, Freedman, Wendy L., Madore, Barry F., Hoyt, Taylor J., Monson, Andrew J., Rich, Jeffrey A., Scowcroft, Victoria, Seibert, Mark

“…Abstract The Carnegie–Chicago Hubble Program (CCHP) seeks to anchor the distance scale of Type Ia supernovae via the Tip of the Red Giant Branch (TRGB) method…”
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SN 2012fr: Ultraviolet, Optical, and Near-infrared Light Curves of a Type Ia Supernova Observed within a Day of Explosion by Contreras, Carlos, Phillips, M. M., Burns, Christopher R., Piro, Anthony L., Shappee, B. J., Stritzinger, Maximilian D., Baltay, C., Brown, Peter J., Conseil, Emmanuel, Klotz, Alain, Nugent, Peter E., Turpin, Damien, Parker, Stu, Rabinowitz, D., Hsiao, Eric Y., Morrell, Nidia, Campillay, Abdo, Castellón, Sergio, Corco, Carlos, González, Consuelo, Krisciunas, Kevin, Serón, Jacqueline, Tucker, Brad E., Walker, E. S., Baron, E., Cain, C., Childress, Michael J., Folatelli, Gastón, Freedman, Wendy L., Hamuy, Mario, Hoeflich, P., Persson, S. E., Scalzo, Richard, Schmidt, Brian, Suntzeff, Nicholas B.

“…Abstract We present detailed ultraviolet, optical, and near-infrared light curves of the Type Ia supernova (SN) 2012fr, which exploded in the Fornax cluster…”
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The Carnegie–Chicago Hubble Program. V. The Distances to NGC 1448 and NGC 1316 via the Tip of the Red Giant Branch by Hatt, Dylan, Freedman, Wendy L., Madore, Barry F., Jang, In Sung, Beaton, Rachael L., Hoyt, Taylor J., Lee, Myung Gyoon, Monson, Andrew J., Rich, Jeffrey A., Scowcroft, Victoria, Seibert, Mark

“…Abstract The Carnegie–Chicago Hubble Program (CCHP) is recalibrating the extragalactic SN Ia distance scale using exclusively Population II stars. This effort…”
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On a New Theoretical Framework for RR Lyrae Stars. II. Mid-infrared Period-Luminosity-Metallicity Relations by Neeley, Jillian R., Marengo, Massimo, Bono, Giuseppe, Braga, Vittorio F., Dall'Ora, Massimo, Magurno, Davide, Marconi, Marcella, Trueba, Nicolas, Tognelli, Emanuele, Moroni, Pier G. Prada, Beaton, Rachael L., Freedman, Wendy L., Madore, Barry F., Monson, Andrew J., Scowcroft, Victoria, Seibert, Mark, Stetson, Peter B.

“…We present new theoretical period-luminosity-metallicity (PLZ) relations for RR Lyræ stars (RRLs) at Spitzer and WISE wavelengths. The PLZ relations were…”
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Coordinated JWST Imaging of Three Distance Indicators in a Supernova Host Galaxy and an Estimate of the Tip of the Red Giant Branch Color Dependence by Hoyt, Taylor J., Jang, In Sung, Freedman, Wendy L., Madore, Barry F., Lee, Abigail J., Owens, Kayla A.

“…Abstract Boasting a 6.5 m mirror in space, JWST can increase by several times the number of supernovae (SNe) to which a redshift-independent distance has been…”
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