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<!DOCTYPE HTML>
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<html>
<head>
<title>Group - Jan-Torge Schindler, PhD</title>
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<body class="is-preload">
<!-- Page Wrapper -->
<div id="page-wrapper">
<!-- Header -->
<header id="header">
<!-- <h1><a href="index.html">Jan-Torge Schindler</a></h1> -->
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<ul>
<li><a href="index.html">Home</a></li>
<li><a href="aboutme.html">About Me</a></li>
<li><a href="research.html">Research</a></li>
<li><a href="group.html">Group</a></li>
<li><a href="software.html">Software</a></li>
<li><a href="resources.html">Resources</a></li>
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<!-- Main -->
<article id="group">
<header>
<h2>Research group at Hamburg Observatory</h2>
<!-- Image by <a href="https://pixabay.com/users/josephredfield-8385382/?utm_source=link-attribution&utm_medium=referral&utm_campaign=image&utm_content=4050698">Joseph Redfield Nino</a> from <a href="https://pixabay.com//?utm_source=link-attribution&utm_medium=referral&utm_campaign=image&utm_content=4050698">Pixabay</a> -->
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</header>
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<section class="wrapper style1 special">
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<header class="align-left">
<h2>Emmy Noether Research Group</h2>
</header>
<p> I am building a new research group at Hamburg Observatory focused on the formation of structures in the early Universe, specifically
we aim to understand the emergence of quasars - active growing supermassive black holes.
In order to expand the quasar redshift frontier and build statistical samples at Cosmic Dawn,
we are using wide-area surveys in concert with large ground-based and space-borne observatories to conduct spectroscopic identification campaigns and multi-wavelength follow-up observations.
The quasar selection strategies employ machine-learning methods on large astronomical data sets. Follow-up observations are reduced using state-of-the-art
astronomical data reduction software and analysed using modern statistical inference techniques.</p>
<p> In this context group members use and are trained in the following skills to conduct their research:</p>
<ul style="margin-left: 40px;">
<li>spectroscopic data reduction</li>
<li>large-scale data analysis</li>
<li>machine-learning methods</li>
<li>robust statistical inference techniques</li>
<li>software development (Python 3)</li>
</ul>
<h3>Positions</h3>
<p> At this point I am offering no PhD or Postdoc position in my group.</p>
<h3>Thesis projects</h3>
<h4> <u>Bachelor</u> thesis projects:</h4>
<ul style="margin-left: 40px;">
<li><h4> The radio-properties of extremely luminous quasars</h4>
<p>
<u>Description:</u> The student will analyse LOFAR radio data of a
sample of extremely luminous quasars to study their radio properties and compare them to the
general quasar population. <br>
<u>Required skills:</u> Python programming (analysis, visualization)<br>
<u>Supervisor(s):</u> Dr. Jan-Torge Schindler & Radha Gharapurkar (M.Sc.)<br>
</p>
</li>
</ul>
<h4> <u>Master</u> thesis projects:</h4>
<ul style="margin-left: 40px;">
<li><h4> Quasar spectroscopy and generative machine learning </h4>
<p>
<u>Description:</u> The student will continue to develop
a generative machine learning model (Variational Auto Encoder), designed to generate quasar
spectroscopy and explore its use in identifying incorrectly classified quasars
in large survey data. <br>
<u>Required skills:</u> Advanced Python programming (analysis, visualization)<br>
<u>Helpful skills:</u> Machine learning (Variational Auto Encoders)<br>
<u>Supervisor(s):</u> Dr. Francesco Guarneri & Dr. Jan-Torge Schindler<br>
</p>
</li>
</ul>
</div>
</section>
<!-- Group table -->
<section class="wrapper style2">
<div class="inner">
<h2> Group members </h2>
<div class="table-wrapper" style="font-size:1.2em">
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<td><div class="portrait"><img src="images/jt_2019_small.jpg"/> </div></td>
<td> Dr. Jan-Torge Schindler (Group leader) </td>
<td></td>
</tr>
<tr>
<td><div class="portrait"><img src="images/francesco_guarneri.jpeg"/> </div></td>
<td>Dr. Francesco Guarneri (Postdoctoral Researcher) <br><hr>
<p style="font-size:0.7em">Francesco is leading the high redshift quasar search efforts with
Euclid mission data. He is using machine learning models
(e.g., XGBoost) to select quasar candidates in
Euclid data. The training set for the selection is built from synthethic quasar spectra,
that were generated using a generative machine learning model (Variational Auto Encoder)
we are developing in the group.
</p></td>
<td></td>
</tr>
<tr>
<td><div class="portrait"><img src="images/radha_gharapurkar.jpg"/> </div></td>
<td>Radha Gharapurkar (Ph.D. student) <br><hr>
<p style="font-size:0.7em">Radha current work focuses on the demographics of luminous
quasars at redshifts z~3.5 to z~6. Based on a large (58) sample of near-infrared
spectroscopy of extremely luminous quasars, she is studying their physical properties
(e.g., black hole mass, accretion rate) to derive the black hole mass function at z~3.5.
Extending this work to z~6 will allow her to study the evolution of the quasar population
over the first billion years of the Universe.
</p></td>
<td></td>
</tr>
<tr>
<td><div class="portrait"><img src="images/default_female.png"/> </div></td>
<td>Violet Moore (M.Sc. student) <br><hr>
<p style="font-size:0.7em">Violet is a first year Master of Physics student at Hamburg
University. She has started a project to develop a database for high redshift quasars
and AGN. The database will include source properties (e.g., redshift, luminosity,
emission line properties) and will be used to study the demographics of high redshift
accreting supermassive black holes.
</p></td>
</td>
<td></td>
</tr>
<tr>
<td><div class="portrait"><img src="images/default_female.png"/> </div></td>
<td>Katharina Jurk (Ph.D. student, joining in May 2025)
<!-- <br><hr>-->
<!-- <p style="font-size:0.7em">Radha current work focuses on the demographics of luminous-->
<!-- quasars at redshifts z~3.5 to z~6. Based on a large (58) sample of near-infrared-->
<!-- spectroscopy of extremely luminous quasars, she is studying the physical properties-->
<!-- (e.g., black hole mass, accretion rate) to derive the black hole mass function at z~3.5.-->
<!-- Extending this work to z~6 will allow her to study the evolution of the quasar population-->
<!-- over the first billion years of the Universe.-->
</p></td>
<td></td>
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<section class="wrapper style2">
<div class="inner">
<h2> Fromer group members </h2>
<div class="table-wrapper" style="font-size:1.2em">
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<td><div class="portrait"><img src="images/niklas_knop.jpg"/> </div></td>
<td>Niklas Knop (B.Sc. student) <br><hr>
<p style="font-size:0.7em">In his Bachelor thesis Niklas looked for quasars with similar
properties to J0100+2802, the most luminous quasar known at z~6.3. He used the spectra of
SDSS quasars to identify low-redshift analogues and evaluate claims of lensing magnification
in the J0100+2802 spectrum.
</p></td>
<td></td>
</tr>
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<!-- <td>100.00</td>-->
</tr>
</tfoot>
</table>
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</div>
</section>
</article>
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<li>Redesign: Jan-Torge Schindler</li>
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