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<!DOCTYPE html>
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<title>Martine Lokken - Home</title>
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Simple House
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<h1 class="tm-site-title">Martine Lokken</h1>
<h6 class="tm-site-description">Postdoc, Observational Cosmology</h6>
<h6 class="tm-site-description">Institut de Física d'Altes Energies</h6>
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<li class="tm-nav-li"><a href="research.html" class="tm-nav-link">Research</a></li>
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<br>
<img src="img/AAS_specialsession_pic.jpg" alt="Image of me giving a talk at the AAS 2023 winter meeting, special session Cross-Correlating Galaxy Surveys and the CMB: New Probes of Cosmology." style="float: left; margin-right: 30px; margin-left: 100px;" height=300/>
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<p class="col-6 text-left" style="text-align: left; margin-right: 100px; margin-left:100px;"> I am a postdoctoral researcher at the Institut de Física d'Altes Energies in Barcelona, Spain. I'm interested in the major questions in cosmology: what are dark energy and dark matter? How can the large-scale structure we observe today tell us about the past and future of the universe?</p>
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<h2 class="col-12 text-center tm-section-title">My Research at a Glance</h2>
<p class="col-12 text-center"> I focus on studying the large-scale network of matter in the universe called the Cosmic Web. I'm interested in the information that the complex extended structures within this "web," such as filaments and superclusters, hold about the history of our universe. Ultimately, I want to use filamentary structure to search for signs of beyond-the-standard-model physics and cosmology. By working at the intersection of simulations and observations, I am optimizing the information we can glean from existing data and preparing for future sky surveys.</p>
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<p class="col-12 text-center"> Below are the four main projects I am currently working on in my thesis.</p>
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<h4 class="tm-gallery-title">Lyman-α cosmology</h4>
<p class="tm-gallery-description">Working within the Cosmo-LYA group at IFAE, I am working towards making cosmological inference using "P-cross": the correlations between separated lines-of-sight of Lyman-α absorption at redshifts 2-4. </p>
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<h4 class="tm-gallery-title">Oriented Stacking</h4>
<p class="tm-gallery-description">In <a href="https://arxiv.org/abs/2107.05523">Lokken et al (2022, ApJ)</a> we present a new technique which uses oriented stacking and combines multi-wavelength datasets to tease out the average signals from superclusters.</p>
<!-- In <a href="https://arxiv.org/abs/2107.05523">Lokken et al (2021, in review)</a> we validate the method of oriented stacking using simulations and apply it to thermal Sunyaev-Zel'dovich data from the Atacama Cosmology Telescope and galaxy data from the Dark Energy Survey. -->
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<h4 class="tm-gallery-title">Superclustering in alternative cosmologies</h4>
<p class="tm-gallery-description">I am using the Peak Patch simulation to generate large-scale structure for universes with different cosmologies, and test how the characteristics of filamentary structure differ between the various cosmologies.</a></p>
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<h4 class="tm-gallery-title">Astrophysical Feedback and the SZ Effect</h4>
<p class="tm-gallery-description">I am using hydrodynamic simulations to explore how feedback mechanisms, like AGN jets, affect the state of gas in the warm-hot intergalactic medium in filaments. Image from the Illustris Simulation. </p>
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<h4 class="tm-gallery-title" >Simulating Transients And Their Host Galaxies</h4>
<p class="tm-gallery-description">In <a href="https://arxiv.org/abs/2206.02815"> Lokken, Gagliano et al. (2023, MNRAS) </a> we present the Simulated Catalog of Optical Transients and Correlated Hosts (SCOTCH), in which we associate 13 classes of transients with synthetic host galaxies from the CosmoDC2 simulation out to z=3.</p> <a href="research.html#hosts_transients" class="tm-btn tm-btn-success"> Read more </a>
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<h4 class="tm-gallery-title">Measuring Galaxy Morphology with Various Surveys</h4>
<p class="tm-gallery-description">During an REU program at the University of Hawai'i, I worked with Prof. Dave Sanders and Dr. Conor McPartland to compare the acccuracy of morphological measurements using different surveys. We used the GalFit software to fit bulge and disk models to galaxy images in SDSS, HSC, HST, and PS1 imaging. We found that results using PS1 imaging were more accurate than those using SDSS imaging, demonstrating the potential PS1 (the Pan-STARRS 1 survey) to provide morphology information for galaxies across a large sky area.</p>
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<h4 class="tm-gallery-title">The Orbit and Origin of the Dwarf Galaxy Segue-I</h4>
<p class="tm-gallery-description">Working with Prof. Nitya Kallivayalil and Dr. Tobias Fritz at the University of Virginia, I used ground-based observations from the Large Binocular Telescope to measure the proper motion of the ultra-faint dwarf galaxy Segue-I. This was a rare instance of proper motion being measured with ground-based photometry and required detailed corrections for atmospheric distortion. We inferred the orbital history of the galaxy and examined possible histories using simulations. The work is detailed in <a href="https://arxiv.org/abs/1711.09097">this paper</a> and featured <a href="https://aasnova.org/2018/08/08/the-origin-of-the-satellite-segue-1/">in this AAS highlight</a>. Image credit: SDSS.</p>
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