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<!DOCTYPE HTML>
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<title>Teresa Symons</title>
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<h1>Teresa Symons</h1>
<p>
Astrophysics Staff Scientist<span style="height: 0.1em; display: block;"></span>Caltech/IPAC
<!-- Astrophysics Postdoctoral Associate<span style="height: 0.1em; display: block;"></span>University of California, Irvine -->
<!-- <p>Astrophysics PhD Candidate</p><p>Rochester Institute of Technology</p> -->
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<li><a href="#research">Research</a></li>
<li><a href="#outreach">Outreach</a></li>
<li><a href="images/Symons_CV_web.pdf" target="_blank" rel="noopener noreferrer">CV</a></li>
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<h2 class="major">About Me</h2>
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<center><img src="images/me.jpg" style="width:280px; height:280px; object-fit: cover; border-radius: 5%;" alt=""></center>
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<p>I'm an assistant staff scientist within IPAC at the California Institute of Technology.
Previously, I was a postdoctoral research associate in the Department of Physics and Astronomy at the University of California, Irvine.
I received my PhD in Astrophysical Sciences and Technology from the Rochester Institute of Technology, my MS in Computational Physics and Astronomy from the University of Kansas, and my BS in Space Physics
from Embry-Riddle Aeronautical University.
</p>
<p>I work on the source detection and photometry systems for the upcoming <a href="https://science.nasa.gov/mission/neo-surveyor/" target="_blank" rel="noopener noreferrer">NEO Surveyor</a> mission. My research interests are in observational cosmology and I study diffuse cosmological backgrounds.
See <a href="#research">Research</a> for more information. I'm also very passionate about education and outreach.
See <a href="#outreach">Outreach</a> to learn more, or my <a href="images/Symons_CV_web.pdf" target="_blank" rel="noopener noreferrer">CV</a> to learn a whole lot more.
</p>
<p>Click the icons below to visit my other places and spaces on the web and see more of my work. Looking to get in touch?
<a href="mailto:tsymons@ipac@@caltech@@edu?subject=Let's chat"
onmouseover="this.href=this.href.replace('@@','.')">
Email me.
</a>
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<li><a href="https://twitter.com/@deep_space_mine" class="icon brands fa-twitter" target="_blank" rel="noopener noreferrer"><span class="label">Twitter</span></a></li>
</ul></center>
</article>
<!-- Research -->
<article id="research">
<h2 class="major">Research</h2>
<span class="image2 main"><img src="images/nh_cropped_cited.png" alt="" /></span>
<!--<p style="font-size:50%;text-align:right;position:relative;top:-2.5rem;"><i>Image credit: NASA, Joseph Olmsted (STScI) </i></p>-->
<h3>Cosmic Optical Background Estimation</h3>
<p>I recently used archival data from the Long-Range Reconnaissance Imager (LORRI) on <a href="http://pluto.jhuapl.edu/" target="_blank" rel="noopener noreferrer"><i>New Horizons</i></a> to measure optical-wavelength extragalactic background light,
also called the cosmic optical background (COB). This extremely faint, diffuse background contains the record of all galaxy formation and evolution throughout cosmic time.
It provides a point of comparison to the expected emission from known galaxy populations, or the integrated galactic light (IGL).
</p>
<p>
The COB is exceedingly difficult to measure from Earth due to the Zodiacal Light (ZL), which is reflected from dust in the Solar System and 100 times brighter than the expected background level.
The location of <i>New Horizons</i> in the outer Solar System provides a unique opportunity to measure the COB where the ZL is negligible.
Due to the difficulty of subtracting the ZL and other bright astrophysical foregrounds, the many measurements of the COB made over the past several decades are highly conflicting.
However, these robust measurements indicate the presence of an excess diffuse component of emission beyond the expectation of the IGL, shown below.
My measurement confirms this excess, for which there is currently no known source or explanation. See my recent <a href="https://iopscience.iop.org/article/10.3847/1538-4357/acaa37/pdf" target="_blank" rel="noopener noreferrer">paper</a> for more information on how I made my measurement, what it means, and where we can go from here.
</p>
<span class="image2 main"><img src="images/EBL_measurement.png" alt="" /></span>
<p>This figure gives a comparison of my recent measurement (black star) to select previous measurements or constraints on the COB compared to the IGL. COB measurements include those made with the WFPC2 instrument on the <i>Hubble Space Telescope</i> (red crosses), the dark cloud method (gold diamonds), LORRI on <i>New Horizons</i> (orange upper limit, triangles, and circle -- horizontal error bar indicates wavelength range of LORRI), SKYSURF, which is an archival <i>Hubble Space Telescope</i> measurement (green hexagons), CIBER (light and dark blue squares), a combination of DIRBE and 2MASS data (purple pentagons), and <i>IRTS</i> (magenta pluses).
The yellow region gives constraints on the COB from gamma-ray observations, and the teal region gives the upper limit on the IGL from galaxy counts based on observations from the Hubble Deep Field (teal asterisks) and Subaru Deep Field (pink triangles).
The intensity of the ZL at 1 and 5 AU is shown with gray lines to highlight how challenging it is to accurately measure the COB from Earth.
</p>
<hr />
<h3>Undersampled PSF Reconstruction</h3>
<p> Some of my previous work includes point spread function (PSF) reconstruction in severely undersampled images. I developed an algorithm for efficient recovery of the PSF in single exposures using point source stacking and deconvolution.
In any given image, each point source is sampled slightly differently by the underlying pixelization of the detector. When the image resolution is increased over the native resolution, this allows sub-pixel information to be used to reconstruct a higher-resolution PSF.
</p>
<p> For the example case of the upcoming NASA mission <a href="https://spherex.caltech.edu" target="_blank" rel="noopener noreferrer">SPHEREx</a> (Spectro-Photometer for the History of the universe, Epoch of Reionization, and ices Explorer), the PSF is significantly undersampled by design and must be reconstructed to achieve accurate photometry.
This also requires a deconvolution step to remove the effects of the detector pixelization from the PSF generated by stacking point sources while minimizing error due to numerical instability. This method is robust to noisy images and crowded fields, requiring relatively few point sources upon which to build a stack.
See my <a href="https://iopscience.iop.org/article/10.3847/1538-4365/abcaa5/pdf" target="_blank" rel="noopener noreferrer">paper</a> for more details.
</p>
</article>
<!-- Outreach -->
<article id="outreach">
<h2 class="major">Outreach</h2>
<span class="image2 main"><img src="images/kp_cropped.JPG" alt="" /></span>
<p> I'm an American Astronomical Society <a href="https://aas.org/education/aas-astronomy-ambassadors-program" target="_blank" rel="noopener noreferrer">Astronomy Ambassador</a> with a passion for STEM education and public outreach.
I have been involved in outreach activities throughout my academic career and have experience working with adults and children of all ages putting on demonstrations, teaching classes and workshops, facilitating night observing programs, and more.
</p>
<p> My experience as an educator began at <a href="https://astrocampschool.org" target="_blank" rel="noopener noreferrer">Astrocamp</a>, a non-profit provider of STEM and outdoor education programs for school groups.
There, I received training in hands-on, highly adaptive experiential learning practices and the Next Generation Science Standards. I have carried this experience with me as a teacher of science museum workshops and facilitator of university outreach programs.
See my <a href="images/Symons_CV_web.pdf" target="_blank" rel="noopener noreferrer">CV</a> for more on my outreach and educational activities.
</p>
</article>
<!-- CV -->
<!-- <article id="cv">
<h2 class="major">CV</h2>
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<label for="name">Name</label>
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</div>
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<h2 class="major">Elements</h2>
<section>
<h3 class="major">Text</h3>
<p>This is <b>bold</b> and this is <strong>strong</strong>. This is <i>italic</i> and this is <em>emphasized</em>.
This is <sup>superscript</sup> text and this is <sub>subscript</sub> text.
This is <u>underlined</u> and this is code: <code>for (;;) { ... }</code>. Finally, <a href="#">this is a link</a>.</p>
<hr />
<h2>Heading Level 2</h2>
<h3>Heading Level 3</h3>
<h4>Heading Level 4</h4>
<h5>Heading Level 5</h5>
<h6>Heading Level 6</h6>
<hr />
<h4>Blockquote</h4>
<blockquote>Fringilla nisl. Donec accumsan interdum nisi, quis tincidunt felis sagittis eget tempus euismod. Vestibulum ante ipsum primis in faucibus vestibulum. Blandit adipiscing eu felis iaculis volutpat ac adipiscing accumsan faucibus. Vestibulum ante ipsum primis in faucibus lorem ipsum dolor sit amet nullam adipiscing eu felis.</blockquote>
<h4>Preformatted</h4>
<pre><code>i = 0;
while (!deck.isInOrder()) {
print 'Iteration ' + i;
deck.shuffle();
i++;
}
print 'It took ' + i + ' iterations to sort the deck.';</code></pre>
</section>
<section>
<h3 class="major">Lists</h3>
<h4>Unordered</h4>
<ul>
<li>Dolor pulvinar etiam.</li>
<li>Sagittis adipiscing.</li>
<li>Felis enim feugiat.</li>
</ul>
<h4>Alternate</h4>
<ul class="alt">
<li>Dolor pulvinar etiam.</li>
<li>Sagittis adipiscing.</li>
<li>Felis enim feugiat.</li>
</ul>
<h4>Ordered</h4>
<ol>
<li>Dolor pulvinar etiam.</li>
<li>Etiam vel felis viverra.</li>
<li>Felis enim feugiat.</li>
<li>Dolor pulvinar etiam.</li>
<li>Etiam vel felis lorem.</li>
<li>Felis enim et feugiat.</li>
</ol>
<h4>Icons</h4>
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<li><a href="#" class="icon brands fa-github"><span class="label">Github</span></a></li>
</ul>
<h4>Actions</h4>
<ul class="actions">
<li><a href="#" class="button primary">Default</a></li>
<li><a href="#" class="button">Default</a></li>
</ul>
<ul class="actions stacked">
<li><a href="#" class="button primary">Default</a></li>
<li><a href="#" class="button">Default</a></li>
</ul>
</section>
<section>
<h3 class="major">Table</h3>
<h4>Default</h4>
<div class="table-wrapper">
<table>
<thead>
<tr>
<th>Name</th>
<th>Description</th>
<th>Price</th>
</tr>
</thead>
<tbody>
<tr>
<td>Item One</td>
<td>Ante turpis integer aliquet porttitor.</td>
<td>29.99</td>
</tr>
<tr>
<td>Item Two</td>
<td>Vis ac commodo adipiscing arcu aliquet.</td>
<td>19.99</td>
</tr>
<tr>
<td>Item Three</td>
<td> Morbi faucibus arcu accumsan lorem.</td>
<td>29.99</td>
</tr>
<tr>
<td>Item Four</td>
<td>Vitae integer tempus condimentum.</td>
<td>19.99</td>
</tr>
<tr>
<td>Item Five</td>
<td>Ante turpis integer aliquet porttitor.</td>
<td>29.99</td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan="2"></td>
<td>100.00</td>
</tr>
</tfoot>
</table>
</div>
<h4>Alternate</h4>
<div class="table-wrapper">
<table class="alt">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
<th>Price</th>
</tr>
</thead>
<tbody>
<tr>
<td>Item One</td>
<td>Ante turpis integer aliquet porttitor.</td>
<td>29.99</td>
</tr>
<tr>
<td>Item Two</td>
<td>Vis ac commodo adipiscing arcu aliquet.</td>
<td>19.99</td>
</tr>
<tr>
<td>Item Three</td>
<td> Morbi faucibus arcu accumsan lorem.</td>
<td>29.99</td>
</tr>
<tr>
<td>Item Four</td>
<td>Vitae integer tempus condimentum.</td>
<td>19.99</td>
</tr>
<tr>
<td>Item Five</td>
<td>Ante turpis integer aliquet porttitor.</td>
<td>29.99</td>
</tr>
</tbody>
<tfoot>
<tr>
<td colspan="2"></td>
<td>100.00</td>
</tr>
</tfoot>
</table>
</div>
</section>
<section>
<h3 class="major">Buttons</h3>
<ul class="actions">
<li><a href="#" class="button primary">Primary</a></li>
<li><a href="#" class="button">Default</a></li>
</ul>
<ul class="actions">
<li><a href="#" class="button">Default</a></li>
<li><a href="#" class="button small">Small</a></li>
</ul>
<ul class="actions">
<li><a href="#" class="button primary icon solid fa-download">Icon</a></li>
<li><a href="#" class="button icon solid fa-download">Icon</a></li>
</ul>
<ul class="actions">
<li><span class="button primary disabled">Disabled</span></li>
<li><span class="button disabled">Disabled</span></li>
</ul>
</section>
<section>
<h3 class="major">Form</h3>
<form method="post" action="#">
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<label for="demo-name">Name</label>
<input type="text" name="demo-name" id="demo-name" value="" placeholder="Jane Doe" />
</div>
<div class="field half">
<label for="demo-email">Email</label>
<input type="email" name="demo-email" id="demo-email" value="" placeholder="jane@untitled.tld" />
</div>
<div class="field">
<label for="demo-category">Category</label>
<select name="demo-category" id="demo-category">
<option value="">-</option>
<option value="1">Manufacturing</option>
<option value="1">Shipping</option>
<option value="1">Administration</option>
<option value="1">Human Resources</option>
</select>
</div>
<div class="field half">
<input type="radio" id="demo-priority-low" name="demo-priority" checked>
<label for="demo-priority-low">Low</label>
</div>
<div class="field half">
<input type="radio" id="demo-priority-high" name="demo-priority">
<label for="demo-priority-high">High</label>
</div>
<div class="field half">
<input type="checkbox" id="demo-copy" name="demo-copy">
<label for="demo-copy">Email me a copy</label>
</div>
<div class="field half">
<input type="checkbox" id="demo-human" name="demo-human" checked>
<label for="demo-human">Not a robot</label>
</div>
<div class="field">
<label for="demo-message">Message</label>
<textarea name="demo-message" id="demo-message" placeholder="Enter your message" rows="6"></textarea>
</div>
</div>
<ul class="actions">
<li><input type="submit" value="Send Message" class="primary" /></li>
<li><input type="reset" value="Reset" /></li>
</ul>
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