Peter Laursen

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Julian D Reynolds

Trinity College Dublin

Eve Emshwiller

University of Wisconsin-Madison

David Seamon

Kansas State University

Armando Marques-Guedes

UNL - New University of Lisbon

Gwen Robbins Schug

University of North Carolina at Greensboro

Tarek Kapiel

Cairo University

Jesper Hoffmeyer

University of Copenhagen

Tanya Smith

Griffith University

Richard Cloutier

Université du Québec à Rimouski

Katie Hinde

Arizona State University

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Papers by Peter Laursen

Probing Patchy Reionization with the Void Probability Function of Lyα Emitters

The Astrophysical Journal

We probe what constraints for the global ionized hydrogen fraction the void probability function ... more We probe what constraints for the global ionized hydrogen fraction the void probability function (VPF) clustering can give for the Lyman Alpha Galaxies in the Epoch of Reionization (LAGER) narrowband survey as a function of area. Neutral hydrogen acts like a fog for Lyα emission, and measuring the drop in the luminosity function of Lyα emitters (LAEs) has been used to constrain the ionization fraction in narrowband surveys. However, the clustering of LAEs is independent of the luminosity function’s inherent evolution, and can offer additional constraints for reionization under different models. The VPF measures how likely a given circle is to be empty. It is a volume-averaged clustering statistic that traces the behavior of higher-order correlations, and its simplicity offers helpful frameworks for planning surveys. Using the Jensen et al. simulations of LAEs within various amounts of ionized intergalactic medium, we predict the behavior of the VPF in one (301 × 150.5 × 30 Mpc3), fo...

$Research paper thumbnail of The Lyman $\alpha$ Reference Sample XIV: Lyman $\alpha$ imaging of 45 low redshift star-forming galaxies and inferences on global emission$

The Lyman $\alpha$ Reference Sample XIV: Lyman $\alpha$ imaging of 45 low redshift star-forming galaxies and inferences on global emission

arXiv (Cornell University), Feb 27, 2023

Galaxy Formation from a Timescale Perspective

Mathematics Online First Collections, 2023

Interpreting Lyman α radiation from young, dusty galaxies

PhDT, Aug 1, 2010

Lyman Alpha as a cosmological tool:Konference, Stockholm

$Research paper thumbnail of Interpreting Lyman $\alpha$ radiation from young, dusty galaxies$

Interpreting Lyman $\alpha$ radiation from young, dusty galaxies

arXiv (Cornell University), Dec 14, 2010

The front page illustrates the essence of this work, under the directives given by the University... more The front page illustrates the essence of this work, under the directives given by the University Design Guidelines, which seem to be very preoccupied with bubbles. The lower bubble displays a snapshot from a cosmological simulation at the time when the Universe was two and a half billion years old. The region is some 13 million lightyears across. Roughly one thousand galaxies float around in this volume, organized in beautiful filamentary structures, separated by huge voids of nothingness. Zooming in on one of the little dots, the middle bubble shows a pencil drawing of a few galaxies, slightly smeared out with my finger to create the effect of gaseous nebulae, and subsequently color-inverted. The upper bubble shows the closest zoom-in, symbolizing the fact that this work is predominantly numerical. In the simulations, the physical properties of the galaxies are represented by millions of numbers arranged in a threedimensional irregular matrix of cells. Two different projections of this matrix are shown in red and cyan, respectively, generating an anaglyph image which can be viewed with a pair of 3D glasses (although in the printed version the cyan may come out a bit too dark). In between the cells is seen a few lines from the computer code.

Peter Laursen

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