-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathindex.html
More file actions
405 lines (365 loc) · 21 KB
/
Copy pathindex.html
File metadata and controls
405 lines (365 loc) · 21 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
<!DOCTYPE HTML>
<!--
Dimension by HTML5 UP
html5up.net | @ajlkn
Free for personal and commercial use under the CCA 3.0 license (html5up.net/license)
-->
<html>
<head>
<title>Fergus Donnan</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no" />
<meta name="google-site-verification" content="caevEwuOAVqxyOuo7L3EaFuMl1tFtTRc7UQ5_XAGKGc" />
<link rel="stylesheet" href="assets/css/main.css" />
<noscript><link rel="stylesheet" href="assets/css/noscript.css" /></noscript>
</head>
<body class="is-preload">
<!-- Wrapper -->
<div id="wrapper">
<!-- Header -->
<header id="header">
<div class="content">
<div class="inner">
<h1>Fergus Donnan</h1>
<p>Postdoctoral Fellow, University of California San Diego, CA, USA</p>
<a href="CV.pdf">CV</a>
<p><a href="mailto:fdonnan@ucsd.edu">fdonnan@ucsd.edu</a></p>
</div>
</div>
<nav>
<ul>
<li><a href="#intro">About Me</a></li>
<li><a href="#work">Research</a></li>
<li><a href="#about">Software</a></li>
<li><a href="#contact">Contact</a></li>
<!--<li><a href="#elements">Elements</a></li>-->
</ul>
</nav>
</header>
<!-- Main -->
<div id="main">
<!-- Intro -->
<article id="intro">
<h2 class="major">About Me</h2>
<img src="images/Portrait Photo.jpg" alt="" style="width: 30%; height: auto; float: right; margin-left: 20px; margin-bottom: 10px;" />
<p>I am currently a postdoc at UCSD working with Karin Sandstrom.
I am an observational astrophysicist that studies galaxy evolution with a focus on dust/PAHs in star forming galaxies and Active Galactic Nuclei (AGN), utilizing JWST observations in both the local universe and at cosmic noon. I am a member of the Galactic Activity Torus and Outflow Survey (<a href="https://gatos.myportfolio.com/">GATOS</a>) collaboration working on dust around local AGN while my work at cosmic noon is part of the <a href="https://aspecs.info/">PAHSPECS</a> collaboration. My CV/resume is available <a href="CV.pdf">here</a>.</p>
<p> <b> Research Positions </b>
<br> Postdoctoral Fellow, University of California San Diego, CA, USA (2025 - Present)
<br>Postdoc University of Oxford (2025-2025) </p>
<p> <b> Education </b>
<br> DPhil. Astrophysics, University of Oxford (Supervisors: Dimitra Rigopoulou, Ismael García-Bernete) (2021-2025)
<br> MPhys. (1st class) Astrophysics, University of St. Andrews (Supervisors: Keith Horne, Juan Hernandez-Santisteban) (2016-2021) </p>
<p> <b> Publications </b></p>
<p>A full list of publications can be found <a href="https://ui.adsabs.harvard.edu/search/fq=%7B!type%3Daqp%20v%3D%24fq_database%7D&fq_database=(database%3Aastronomy%20OR%20database%3Aphysics)&q=%20author%3A%22Donnan%2C%20F%22&sort=date%20desc%2C%20bibcode%20desc&p_=0">here</a>.</p>
<p></p>
</article>
<!-- Work -->
<article id="work">
<h2 class="major">Research</h2>
<p><a><b>Polycyclic Aromatic Hydrocarbons (PAHs) across cosmic time.</b></a>
<br>PAHs are molecules comprised of rings of carbon atoms and are ubiquitous in the interstellar medium (ISM) of galaxies. They are excited by UV photons from young stars which re-emit as broad emission features in the mid-infrared and thus are great diagnositcs of dust properties. In the local universe, using my spectral decomposition code, we have found PAHs to be altered by AGN, particularly in outflow regions (<a href="https://ui.adsabs.harvard.edu/abs/2024A%26A...691A.162G/abstract">García-Bernete+24c</a>, <a href="https://ui.adsabs.harvard.edu/abs/2024MNRAS.532.1598R/abstract">Rigopoulou+24</a>) where PAHs appear more neutral. At cosmic noon, I am using MIRI spectroscopy from the PAHSPECS program to produce spatially resolved maps of PAH ratios at cosmic noon for the first time. The below figure shows an example where PAHs appear to become more neutral/larger with radius, the opposite of local galaxies. </p>
</p>
<span class="image main"><img src="images/PAHSPECS.jpg" alt="" /></span>
<p><a><b>Kinematics of PAHs</b></a>
<br>Unlike the gas phase of the ISM, dust largely emits thermally close to a blackbody, preventing any kinematics from being measured. However the PAH features, while broad, can be used to infer the kinematics of dust. In (<a href="https://ui.adsabs.harvard.edu/abs/2024MNRAS.532L..75D/abstract">Donnan+24b</a>) I presented the first kinematic maps of PAHs using the technique of PCA tomography. The below figure shows this technique in action, opening a new window into the ISM of galaxies. This is particularly exciting to investigate a key open question about the dust around AGN, do AGN lauch dusty outflows/winds? In Donnan+26a,c I tackle this question using samples of local AGN. In (<a href="https://ui.adsabs.harvard.edu/abs/2026arXiv260312200D/abstract">Donnan+26a</a>) I presented the first kinematic maps of dust outflowing from AGN. Out of a sample of 10 local Seyferts, two showed kinematic evidence for dusty outflows. In a follow up work Donnan+26c, I apply the same technique to a sample of higher Eddington ratio quasars, finding 3 with kinematic evidence of PAHs in the outflow out of a total sample of 5.</a>) . </p>
<span class="image main"><img src="images/AGN Dust Outflow Fig_page-0001.jpg" alt="" /></span>
<p><a><b>The Obscured Growth of SMBHs</b></a>
<br> I use JWST near/mid-infrared spectroscopy to study the most obscured galactic nuclei at the hearts of Ultra Luminous Infrared Galaxies (ULIRGs). I have demonstrated how mid-infrared spectroscopy can be used to identify such objects where even X-rays fail ( <a href="https://ui.adsabs.harvard.edu/abs/2023A%26A...669A..87D/abstract">Donnan+23a</a>) which can be used to identify a potentially missing source of obscured SMBH growth across cosmic time both with JWST ( <a href="https://ui.adsabs.harvard.edu/abs/2025A%26A...696A.135G/abstract">García-Bernete+25</a>) and future telescopes such as PRIMA (<a href="https://ui.adsabs.harvard.edu/abs/2025JATIS..11c1606D/abstract">Donnan+25</a>). With the complex spectra JWST is producing of obscured envionments, I have produce the only fitting tool capable of fitting the most obscured galaxy nuclei (<a href="https://ui.adsabs.harvard.edu/abs/2024MNRAS.529.1386D/abstract">Donnan+24a</a>), which employs a "differential extinction" model to produce a 2D distribution of dust extinction and temperature. The below figure demonstrates a fit with this tool with the inferred 2D dust distribution in the right panel. The code is publically available <a href=""> here</a>.</p>
<span class="image main"><img src="images/Spectrum.jpg" alt="" /></span>
<p><a><b>Echo Mapping of AGN Accretion Disks</b></a>
<br>During my Masters work I developed a new tool (<a href="https://github.com/FergusDonnan/PyROA">PyROA</a>) to measure the time delays between AGN lightcurves, probing scales of light days in the accretion disk of the AGN, using a running optimal average (<a href="https://ui.adsabs.harvard.edu/abs/2021MNRAS.508.5449D/abstract">Donnan+21</a>). This method is fully Bayesian and accounts for outliers and gaps in the lightcurves enabling accurate inference of the time delays between AGN lightcurves and is in use in numerous works. For example, in <a href="https://ui.adsabs.harvard.edu/abs/2023MNRAS.523..545D/abstract">Donnan+23c</a>, we used photometric time series observations of the local quasar PG1119+120, to test accretion in the super-Eddington regime. The tool is publically available <a href="https://github.com/FergusDonnan/PyROA">here</a>. </p>
<span class="image main"><img src="images/EchoDiagram.jpg" alt="" /></span>
</article>
<!-- About -->
<article id="about">
<h2 class="major">Software</h2>
<p><a><b> <a href="https://github.com/FergusDonnan/SPIRIT">SPIRIT - SPectral InfraRed Inference Tool</a></b></a>
<br> I have built a spectral decomposition tool for near/mid-infrared JWST spectra which is able to fit a variety of kinds of spectra, from simple star-forming regions to AGN and highly obscured regions. This allows one to extract accurate PAH fluxes as well as infer the nature of the obscuring dust via the inferred 2D dust distribution of extinction and temperature. Below is an example fitting to a variety of different spectra from the GOALS ERS program as well as the GUI to easily fit spectra. The code is publically available <a href="https://github.com/FergusDonnan/SPIRIT">here</a>.
</p>
<p>The code is easy to run with an interactive GUI where various different options can be selected such as the extinction curve, ice templates and the fitting method.</p>
<span class="image main"><img src="images/Demo_Fig.png" alt="" /></span>
<span class="image main"><img src="images/GUI.png" alt="" /></span>
<p><a><b> <a href="https://github.com/FergusDonnan/PyROA">PyROA - Modelling AGN Lightcurves</a></b></a>
<br>PyROA is a tool for modelling quasar lightcurves (<a href="https://ui.adsabs.harvard.edu/abs/2021MNRAS.508.5449D/abstract">Donnan et al. 2021</a>) where the variability is described using a running optimal average (ROA), and paramters are sampled using Markov Chain Monte Carlo (MCMC) techniques - specifically using emcee. Using a Bayesian approach, priors can be used on the sampled parameters. It can also intercalibrate same-filter ligthcurves from different telescopes and adjust their uncertainties accordingly ( <a href="https://ui.adsabs.harvard.edu/abs/2023MNRAS.523..545D/abstract">Donnan et al. 2023</a>). Currently it has three main uses:
<ol>
<li> Determining the time delay between lightcurves at different wavelengths.</li>
<li> Intercalibrating lightcurves from multiple telescopes, merging them into a single lightcurve.</li>
<li> Determining the time delay between images of lensed quasars, where the microlensing effects are also modelled.</li>
</ol>
PyROA also includes a noise model, where there is a parameter for each lightcurve that adds extra variance to the flux measurments, to account for underestimated errors. This can be turned off if required.
The code is easy to use with example jupyter notebooks provided, demonstrating each of the three main uses. The code is ran by specifying a directory which contains each of the lightcurves as a .dat file with the columns being time, flux, flux_err in that order. All that is also needed is to specify the prior, specifically the limits of a uniform prior on each of the parameters. The Code is available <a href="https://github.com/FergusDonnan/PyROA">here</a>.
</p>
<span class="image main"><img src="images/PyROA.jpg" alt="" /></span>
</article>
<!-- Contact -->
<article id="contact">
<h2 class="major">Contact</h2>
<form method="POST" action="https://formspree.io/f/mbdjanqb">
<div class="fields">
<div class="field half">
<label for="name">Name</label>
<input type="text" name="name" id="name" required />
</div>
<div class="field half">
<label for="email">Email</label>
<input type="email" name="email" id="email" required />
</div>
<div class="field">
<label for="message">Message</label>
<textarea name="message" id="message" rows="4" required></textarea>
</div>
</div>
<ul class="actions">
<li><input type="submit" value="Send Message" class="primary" /></li>
<li><input type="reset" value="Reset" /></li>
</ul>
</form>
<ul class="icons">
<li><a href="https://github.com/FergusDonnan" class="icon brands fa-github"><span class="label">GitHub</span></a></li>
</ul>
</article>
<!-- Elements -->
<article id="elements">
<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>
<ul class="icons">
<li><a href="#" class="icon brands fa-twitter"><span class="label">Twitter</span></a></li>
<li><a href="#" class="icon brands fa-facebook-f"><span class="label">Facebook</span></a></li>
<li><a href="#" class="icon brands fa-instagram"><span class="label">Instagram</span></a></li>
<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="#">
<div class="fields">
<div class="field half">
<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>
</form>
</section>
</article>
</div>
<!-- Footer -->
<footer id="footer">
<p class="copyright">© Untitled. Design: <a href="https://html5up.net">HTML5 UP</a>.</p>
</footer>
</div>
<!-- BG -->
<div id="bg"></div>
<!-- Scripts -->
<script src="assets/js/jquery.min.js"></script>
<script src="assets/js/browser.min.js"></script>
<script src="assets/js/breakpoints.min.js"></script>
<script src="assets/js/util.js"></script>
<script src="assets/js/main.js"></script>
</body>
</html>