M
Michael Walther
Researcher at Max Planck Society
Publications - 25
Citations - 796
Michael Walther is an academic researcher from Max Planck Society. The author has contributed to research in topics: Quasar & Redshift. The author has an hindex of 11, co-authored 13 publications receiving 537 citations. Previous affiliations of Michael Walther include Heidelberg University & University of California, Santa Barbara.
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Journal ArticleDOI
Hints, neutrino bounds, and WDM constraints from SDSS DR14 Lyman-α and Planck full-survey data
Nathalie Palanque-Delabrouille,Christophe Yèche,Nils Schöneberg,Julien Lesgourgues,Michael Walther,Solène Chabanier,Eric Armengaud +6 more
TL;DR: In this article, the spectral index of the Lyman-α forest 1D flux power spectrum is used to estimate the neutrino mass under weak lensing constraints on (Ωm,σ8) and has the same small tension with Planck.
Journal ArticleDOI
New Constraints on IGM Thermal Evolution from the Lyα Forest Power Spectrum
TL;DR: In this paper, the thermal evolution of the intergalactic medium (IGM) over 3 Gyr of cosmic time 1.8 l z l 5.4 by comparing measurements of the Ly forest power spectrum to a suite of 70 hydrodynamical simulations was determined.
Journal ArticleDOI
New Constraints on IGM Thermal Evolution from the Ly{\alpha} Forest Power Spectrum.
TL;DR: In this paper, the thermal evolution of the intergalactic medium (IGM) over cosmic time was determined by comparing measurements of the Lyalpha forest power spectrum to a suite of hydrodynamical simulations.
Journal ArticleDOI
A New Measurement of the Temperature-density Relation of the IGM from Voigt Profile Fitting
Hector Hiss,Hector Hiss,Michael Walther,Michael Walther,Michael Walther,Joseph F. Hennawi,Joseph F. Hennawi,Jose Oñorbe,John M. O'Meara,Alberto Rorai,Alberto Rorai,Zarija Lukić +11 more
TL;DR: Hiss et al. as mentioned in this paper decompose the Lyman-α (Lyα) forest of an extensive sample of 75 high signal-to-noise ratio and high-resolution quasar spectra into a collection of Voigt profiles.
Journal ArticleDOI
Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument
Behzad Abareshi,Jessica Aguilar,S. P. Ahlen,Shadab Alam,David M. Alexander,R. Alfarsy,L. Allen,Carlos Allende Prieto,O. Alves,J.Ameel,E. Armengaud,Jacobo Asorey,Alejandro Aviles,Sheila G. Bailey,A. Balaguera-Antol'inez,O. Ballester,C. Baltay,A. Th bault,S. F. Beltran,B. Izamar T. Benavides,Segev BenZvi,Angela Berti,Robert Besuner,Florian Beutler,D. Bianchi,C. Blake,Pierre-Eric Blanc,Robert Blum,Adam S. Bolton,Sougato Bose,David Bramall,S. Brieden,A. Brodzeller,David J. Brooks,Charles Brownewell,E. Buckley-Geer,Robert N. Cahn,Z. Cai,Rebecca E. A. Canning,A. Carnero Rosell,P. H. Carton,R. A. Casas,Francisco J. Castander,Jorge L. Cervantes-Cota,Solène Chabanier,Edmond Chaussidon,Chia-Hsun Chuang,C. Circosta,Shaun Cole,Andrew Cooper,Luiz N. da Costa,M. C. Cousinou,Andrei Cuceu,Tamara M. Davis,Kyle S. Dawson,R. D. L. Cruz-Noriega,Axel de La Macorra,Arnaud de Mattia,John D’ Costa,Peg Demmer,Mark Derwent,Aniruddha Dey,Bill Dey,G. Dhungana,Zhejie Ding,Cassandra Dobson,Peter Doel,J. Donald-McCann,John B. Donaldson,Kimberly Douglass,Yutong Duan,Patrick Dunlop,Jerry Edelstein,Sarah Eftekharzadeh,Daniel J. Eisenstein,M. Enriquez-Vargas,Stephanie Escoffier,Matthew Evatt,Parker Fagrelius,Xiaoping Fan,Kevin Fanning,V. A. Fawcett,Simone Ferraro,J. Ereza,B. Flaugher,Andreu Font-Ribera,Jaime E. Forero-Romero,Carlos S. Frenk,S. Fromenteau,Boris T. Gaensicke,Cristhian Garcia-Quintero,Lehman H. Garrison,Enrique Gaztanaga,F.M. Gerardi,H. Gil-Mar'in,Satya Gontcho A Gontcho,Alma X. Gonzalez-Morales,Guillermo Gonzalez-de-Rivera,Violeta Gonzalez-Perez,Carmit Gordon,Or Graur,Dan Green,C.G. Grove,Daniel Gruen,G. Gutierrez,Julien Guy,Corey Hahn,S. Harris,David Herrera,Hiram K. Herrera-Alcantar,K. Honscheid,Cullan Howlett,D. Huterer,V. Irvsivc,Muhiddin Ishak,Patrick N. Jelinsky,L. Jiang,Jorge Jiménez,Yanfeng Jing,Robin Joyce,Eric Jullo,Stéphanie Juneau,N. G. Karaccayli,Minas Karamanis,Armin Karcher,Tanveer Karim,Robert James Kehoe,Stephen M. Kent,D. Kirkby,Theodore Kisner,Francisco-Shu Kitaura,Sergey E. Koposov,A. Kov'acs,A. Kremin,Alex Krolewski,Benjamin L'Huillier,Ofer Lahav,A. Lambert,Claire Lamman,Ting-Wen Lan,Martin Landriau,Stacy Lane,Dustin Lang,Johannes U. Lange,J. Lasker,L. Le Guillou,Alexie Leauthaud,A. Le Van Suu,Michael Levin,T. Li,Christophe Magneville,Marc Manera,Christopher J. Manser,Bob Marshall,W. Jr. McCollam,Patrick McDonald,Aaron M. Meisner,J. M. M. Mezcua,T. Miller,Ramon Miquel,Paulo Montero-Camacho,Jeongin Moon,Juan P. Martini,J. Meneses-Rizo,John Moustakas,Eva Maria Mueller,Andrea Munoz-Guti'errez,Adam D. Myers,Seshadri Nadathur,Joan Najita,Lara Rita Napolitano,Eric H. Neilsen,Jeffrey A. Newman,J.D.Nie,Yuanhang Ning,Gustavo Niz,Peder Norberg,Hernán E. Noriega,T. O'Brien,Andrej Obuljen,Nathalie Palanque-Delabrouille,Antonella Palmese,Pan Zhiwei,Daniela Pappalardo,X. Peng,Will J. Percival,S. Perruchot,Richard W. Pogge,Claire Poppett,A. Porredon,Francisco Prada,JoLynn Prochaska,Ragadeepika Pucha,A. P'erez-Fern'andez,I. P'erez-R'afols,David Rabinowitz,Anand Raichoor,S. Ramirez-Solano,C'esar Ram'irez-P'erez,Corentin Ravoux,Kevin Reil,Mehdi Rezaie,A. Rocher,Constance M. Rockosi,Natalie A. Roe,A. Roodman,Ashley J. Ross,Graziano Rossi,Rossana Ruggeri,V. Ruhlmann-Kleider,Cristiano G. Sabiu,Sasha Safonova,Khaled Said,Amélie Saintonge,Javier Salas Catonga,Lado Samushia,E. Sánchez,Christoph Saulder,Emmanuel Schaan,Edward F. Schlafly,David J. Schlegel,Jürgen Schmoll,D. Scholte,Michael Schubnell,A. Secroun,Hyunju Seo,S. Serrano,Ray M. Sharples,Michael Sholl,Joseph H. Silber,David R. Silva,Martin M. Sirk,Małgorzata Siudek,A. Smith,David Sprayberry,Ryan Staten,Bob Stupak,Tao Tan,Gregory Tarl'e,Suk Sien Tie,Rita Tojeiro,L. A. Urena-L'opez,F. Valdes,Octavio Valenzuela,Malarkodi Velraj and Lenin Babu Valluri,Mariana Vargas-Magaña,Licia Verde,Michael Walther,Bo Wang,M. Wang,B. A. Weaver,C. Weaverdyck,Risa H. Wechsler,Michael J. Wilson,J. Yang,Y. Yu,S. Yuan,Christophe Yèche,H Zhang,K. Zhang,Cheng-Xuan Zhao,Rongpu Zhou,Zhimin Zhou,Hu Zou,Junbiao Zou,S. Zou,Yiming Zu +266 more
TL;DR: The Dark Energy Spectroscopic Instrument (DESI) as mentioned in this paper was designed to explore the nature of dark energy with spectroscopic measurements of 40 million galaxies and quasars and employed the baryon acoustic oscillation method to measure distances from the nearby universe to beyond redshift z > 3.5.