https://research.edengirma.me eden girma | research Wed, 13 Mar 2024 21:24:09 +0000 https://research.edengirma.me en https://research.edengirma.me/Desktop Sat, 29 Jan 2022 16:19:45 +0000 eden girma | research https://research.edengirma.me/Desktop <img width="1024" height="1024" width_o="1024" height_o="1024" data-src="https://freight.cargo.site/t/original/i/86b7ee949cfcbb8b5ccc31babbbd49a9b26ec9b73b9f74c957da80aa582ddc9e/mail.png" data-mid="131841784" border="0" data-no-zoom="true" alt="email me academia style" data-caption="email me academia style" src="https://freight.cargo.site/w/1000/i/86b7ee949cfcbb8b5ccc31babbbd49a9b26ec9b73b9f74c957da80aa582ddc9e/mail.png" /> <img width="1024" height="1024" width_o="1024" height_o="1024" data-src="https://freight.cargo.site/t/original/i/8f7e2160d8deb762b16a4ac3a7d29f90633473954cac6b4539b7656ebf137cd1/FinderIcon_1024x1024x32.png" data-mid="131843282" border="0" data-no-zoom="true" alt="Finder" data-caption="Finder" 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data-src="https://freight.cargo.site/t/original/i/c1ec531400319a4afd5ddce37c77abb753d4bed22da0be07cb63f96e7f4f1ea1/IMG_7196.JPG" data-mid="250516713" border="0" alt="IMG_7196.JPG" data-caption="IMG_7196.JPG" src="https://freight.cargo.site/w/1000/i/c1ec531400319a4afd5ddce37c77abb753d4bed22da0be07cb63f96e7f4f1ea1/IMG_7196.JPG" /> <img width="4000" height="3000" width_o="4000" height_o="3000" data-src="https://freight.cargo.site/t/original/i/1e47bd5ffa370dd982d22d44891dcb4903aa36051ad9685261d5a235d191e5d3/43da5525-4d62-4192-9a7e-599ecf7b1fa6.JPG" data-mid="250516710" border="0" alt="43da5525-4d62-...6.JPG" data-caption="43da5525-4d62-...6.JPG" src="https://freight.cargo.site/w/1000/i/1e47bd5ffa370dd982d22d44891dcb4903aa36051ad9685261d5a235d191e5d3/43da5525-4d62-4192-9a7e-599ecf7b1fa6.JPG" /> <img width="280" height="357" width_o="280" height_o="357" data-src="https://freight.cargo.site/t/original/i/1baed578212d8f4444bc80a46e258110091c0e27327d46588b16e5ad3b6bd9ba/Princeton_seal.svg" data-mid="131844786" border="0" data-no-zoom="true" alt="princeton astro" data-caption="princeton astro" src="https://freight.cargo.site/w/280/i/1baed578212d8f4444bc80a46e258110091c0e27327d46588b16e5ad3b6bd9ba/Princeton_seal.svg" /> <img width="720" height="720" width_o="720" height_o="720" data-src="https://freight.cargo.site/t/original/i/037bff0516f791f5ec147562f760e54a0011803ffd831459fac501f88cf4f4ae/XVo6.gif" data-mid="131844392" border="0" src="https://freight.cargo.site/w/720/i/037bff0516f791f5ec147562f760e54a0011803ffd831459fac501f88cf4f4ae/XVo6.gif" /> <img width="1271" height="1080" width_o="1271" height_o="1080" data-src="https://freight.cargo.site/t/original/i/959f87f841b2fb55fd5d5d4b264653986c4480b0d74e712b60eaa283568ef89c/3-black-hole-spit-ball.jpg" data-mid="131844475" border="0" data-no-zoom="true" alt="nat geo article" data-caption="nat geo article" src="https://freight.cargo.site/w/1000/i/959f87f841b2fb55fd5d5d4b264653986c4480b0d74e712b60eaa283568ef89c/3-black-hole-spit-ball.jpg" /> <img width="2316" height="3088" width_o="2316" height_o="3088" data-src="https://freight.cargo.site/t/original/i/d3b2bd9bce5f823c53c023e5208125c52de9a84007cf9d5d306b65945d1512c2/IMG_0406.JPG" data-mid="250516711" border="0" alt="IMG_0406.JPG" data-caption="IMG_0406.JPG" src="https://freight.cargo.site/w/1000/i/d3b2bd9bce5f823c53c023e5208125c52de9a84007cf9d5d306b65945d1512c2/IMG_0406.JPG" /> https://research.edengirma.me/readme Wed, 02 Aug 2023 01:42:14 +0000 eden girma | research https://research.edengirma.me/readme Welcome to my science page :) I graduated from Harvard in 2018 with a B.A. in Astrophysics and Math -- meaning, I learned a lot of wonderful things about subjects such as cosmology, topology, quantum mechanics, abstract algebra, and dynamical systems. For my Ph.D thesis (advised by Romain Teyssier), I’m exploring a new computational approach to modeling the central kiloparsec (kpc) of very high-redshift galaxies, namely those formed within the first billion years of the Universe. I’ve developed a suite of high-resolution RT-MHD isolated simulations in RAMSES-RT that deliberately focuses on the central gas reservoirs of possible high-redshift galaxy systems. Through examining a wide parameter space of conditions at parsec-scale levels of detail, I aim to capture in a self-consistent model how the nuclear regions of these earliest galaxies can stabilize and evolve, characterize how physical parameters impact observable properties on sub-kpc scales, and enable more detailed comparisons to the exciting ongoing observational discoveries from JWST! Look around this site to explore some projects of mine, which include ☼ novel subgrid MHD star formation models for cosmological galaxy formation simulations&nbsp;(advised by Romain Teyssier) ☼ characterizing&nbsp;and developing theoretical models for the radio emission of the MASSIVE survey galaxies (advised by&nbsp;Jenny Greene, Kristina Nyland, &amp; Eliot Quataert)☼ and more!&nbsp;＼(˘◡˘)／ As always, I'm happy to answer questions about my science work and can be reached at egirma [at] princeton.edu ~ https://research.edengirma.me/research Wed, 13 Mar 2024 20:31:31 +0000 eden girma | research https://research.edengirma.me/research <img width="800" height="648" width_o="800" height_o="648" data-src="https://freight.cargo.site/t/original/i/98dbb9064f4684fbc3feac6b8a5204d0f7396641a5b715e85d53ce3a8989e0db/folder.png" data-mid="206728997" border="0" data-no-zoom="true" alt="fragments produced by tidal disruption events" data-caption="fragments produced by tidal disruption events" src="https://freight.cargo.site/w/800/i/98dbb9064f4684fbc3feac6b8a5204d0f7396641a5b715e85d53ce3a8989e0db/folder.png" /> <img width="800" height="648" width_o="800" height_o="648" data-src="https://freight.cargo.site/t/original/i/98dbb9064f4684fbc3feac6b8a5204d0f7396641a5b715e85d53ce3a8989e0db/folder.png" data-mid="206728997" border="0" data-no-zoom="true" alt="radio emission of MASSIVE galaxies" data-caption="radio emission of MASSIVE galaxies" src="https://freight.cargo.site/w/800/i/98dbb9064f4684fbc3feac6b8a5204d0f7396641a5b715e85d53ce3a8989e0db/folder.png" /> <img width="1232" height="1438" width_o="1232" height_o="1438" data-src="https://freight.cargo.site/t/original/i/b18ac486b9e743a55ba74668dbb85aa6b7bfe9a2a3fd276a2dce991bb72b0555/enhancing-chandra.png" data-mid="206730181" border="0" data-no-zoom="true" alt="enhancing chandra.rtf" data-caption="enhancing chandra.rtf" src="https://freight.cargo.site/w/1000/i/b18ac486b9e743a55ba74668dbb85aa6b7bfe9a2a3fd276a2dce991bb72b0555/enhancing-chandra.png" /> <img width="800" height="648" width_o="800" height_o="648" data-src="https://freight.cargo.site/t/original/i/98dbb9064f4684fbc3feac6b8a5204d0f7396641a5b715e85d53ce3a8989e0db/folder.png" data-mid="206728997" border="0" data-no-zoom="true" alt="astrometric detection of intermediate-mass black holes" data-caption="astrometric detection of intermediate-mass black holes" src="https://freight.cargo.site/w/800/i/98dbb9064f4684fbc3feac6b8a5204d0f7396641a5b715e85d53ce3a8989e0db/folder.png" /> <img width="800" height="648" width_o="800" height_o="648" data-src="https://freight.cargo.site/t/original/i/98dbb9064f4684fbc3feac6b8a5204d0f7396641a5b715e85d53ce3a8989e0db/folder.png" data-mid="206728997" border="0" data-no-zoom="true" data-draggable data-rotation="0" alt="sub-grid MHD star formation recipe in RAMSES" data-caption="sub-grid MHD star formation recipe in RAMSES" src="https://freight.cargo.site/w/800/i/98dbb9064f4684fbc3feac6b8a5204d0f7396641a5b715e85d53ce3a8989e0db/folder.png" /> https://research.edengirma.me/astrometric-detection-of-imbh Sat, 29 Jan 2022 16:23:38 +0000 eden girma | research https://research.edengirma.me/astrometric-detection-of-imbh astrometric detection of intermediate-mass black holes For my senior thesis, I worked with Professor Avi Loeb at the Harvard-Smithsonian Center of Astrophysics to explore with numerical simulations how we might detect a population of intermediate-mass black holes at the center of the galaxy, using recent advancements in radio astronomy. I was awarded both the Hoopes Prize and Leo Goldberg Prize in Astronomy for my work on this thesis, and the research was later condensed into a journal article that has been published in Monthly Notices of the Royal Astronomical Society. ☞ Read the thesis☞ Read the article https://research.edengirma.me/subgrid-SF Wed, 24 Jan 2024 21:26:32 +0000 eden girma | research https://research.edengirma.me/subgrid-SF A new star formation recipe for magnetohydrodynamics simulations of galaxy formationWith Prof. Teyssier, I developed a novel sub-grid recipe for star formation that accounts for the local properties of the sub-grid magnetized ISM turbulence. Compared to its non-magnetized counterpart, our star formation model both suppreses initial starbursts while regulating star formation later on to a nearly constant rate. We also see differences in the local Schmidt law, with a shallower power-law index for the magnetized star formation model. Our results encourage further examination into the notion that magnetic fields are likely to play a non-trivial role in our understanding of star and galaxy formation. ☞ Read the article <img width="2156" height="1454" width_o="2156" height_o="1454" data-src="https://freight.cargo.site/t/original/i/cd83276039b20f86170786b86a27194682670b6a7c1a0b3f7b8aa11df2ccd467/stad3640fig9.jpeg" data-mid="206732415" border="0" src="https://freight.cargo.site/w/1000/i/cd83276039b20f86170786b86a27194682670b6a7c1a0b3f7b8aa11df2ccd467/stad3640fig9.jpeg" /> <img width="2531" height="1476" width_o="2531" height_o="1476" data-src="https://freight.cargo.site/t/original/i/778edadf3eb29feb02502690074867e794ea0e961984f9caf9b8ad3deffe2efd/stad3640fig3.jpeg" data-mid="206732103" border="0" src="https://freight.cargo.site/w/1000/i/778edadf3eb29feb02502690074867e794ea0e961984f9caf9b8ad3deffe2efd/stad3640fig3.jpeg" /> https://research.edengirma.me/fragments-produced-from-tde Sat, 29 Jan 2022 16:26:25 +0000 eden girma | research https://research.edengirma.me/fragments-produced-from-tde fragments produced from tidal disruptions In 2016 I worked with Dr. James Guillochon to study stellar tidal disruptions, and the potential galactic distribution that fragments formed from the gravitational collapse within the tidal stream might possess. The results of this research were presented in a press conference at the 229th meeting of the American Astronomical Society, and further featured in the National Geographic. ☞ Read the arXiv print☞ Check out AAS presentation <img width="1000" height="644" width_o="1000" height_o="644" data-src="https://freight.cargo.site/t/original/i/06305345a34d0b55a00eeb3ff239c5cbc99cd2f912e85fb14bbd881c80095f52/tde-fragments.jpeg" data-mid="131850743" border="0" alt="Artist's rendition of tidal disruption fragments.(Credit: Mark A. Garlick/CfA)" data-caption="&lt;small style='color:white;font-size:1.3rem'&gt;Artist's rendition of tidal disruption fragments.&lt;br&gt;(Credit: Mark A. Garlick/CfA)&lt;/small&gt;" src="https://freight.cargo.site/w/1000/i/06305345a34d0b55a00eeb3ff239c5cbc99cd2f912e85fb14bbd881c80095f52/tde-fragments.jpeg" /> https://research.edengirma.me/massive Wed, 13 Mar 2024 21:24:09 +0000 eden girma | research https://research.edengirma.me/massive radio emission from MASSIVE survey galaxies this is currently a work in progress !!&nbsp;this is currently a work in progress !! this is currently a work in progress !! this is currently a work in progress !! this is currently a work in progress !! I’ve been finishing up a project with Kristina Nyland, Joan Wrobel, and Jenny Greene to characterize the radio emission of galaxies from the MASSIVE survey (Pa et al. 2013). Of the 116 survey galaxies, we targeted 98 with the Karl G. Jansky Very Large Array (VLA) at C-band (4-8 GHz) in the C configuration. These galaxies are&nbsp;nearby (within 108 Mpc) early-type galaxies with stellar-mass ranges of over 1011.5M☉, occupying a critical and as-of-yet systematically unexamined parameter space of massive red galaxies at low redshifts. With this study, and through combining our data with radio observations of the complimentary ATLAS3D sample (Nyland et al. 2015), we aim to provide a robust statistical framework in which to investigate what relationship radio continuum emission might have with ETG properties and their accretion-powered nuclei. Our paper is currently in prep., so please stay tuned! ✌︎ <img width="100" height="113" width_o="100" height_o="113" data-src="https://freight.cargo.site/t/original/i/2da29541902be62153f916b67535be66f33192218f30af4fcd557645b620b44b/ani-constructionguy.gif" data-mid="206736698" border="0" src="https://freight.cargo.site/w/100/i/2da29541902be62153f916b67535be66f33192218f30af4fcd557645b620b44b/ani-constructionguy.gif" /> <img width="480" height="128" width_o="480" height_o="128" data-src="https://freight.cargo.site/t/original/i/eded1f25cd3a622d4fd4028deedfdbde006e3ed1096f6183de4554c3e732bd26/ezgif-7-b1607b69fa.gif" data-mid="206736622" border="0" src="https://freight.cargo.site/w/480/i/eded1f25cd3a622d4fd4028deedfdbde006e3ed1096f6183de4554c3e732bd26/ezgif-7-b1607b69fa.gif" /> <img width="113" height="113" width_o="113" height_o="113" data-src="https://freight.cargo.site/t/original/i/0f868a1385d8dc57dbabba371651e658ec9a4dc3505fe0d43818201de5c7c5db/head_construction.gif" data-mid="206736972" border="0" src="https://freight.cargo.site/w/113/i/0f868a1385d8dc57dbabba371651e658ec9a4dc3505fe0d43818201de5c7c5db/head_construction.gif" /> https://research.edengirma.me/enhancing-chandra Sun, 30 Jan 2022 01:42:32 +0000 eden girma | research https://research.edengirma.me/enhancing-chandra Enhancing the Chandra archive with ZTF alert streams through annotation As a software developer at the Chandra X-ray Observatory I created and now maintain a programmatic interface that enhances the Chandra Data Archive through annotations, which integrate data from optical transient surveys. Our project was in part motivated by the new window on the transient and variable optical sky, opened by current and upcoming synoptic telescopes. Given that transient and variable events are expected to emit in both the visible and X-ray spectrum, cross-matching and multi-band analysis are particularly salient tools for classifying and characterizing these phenomena. We also hope that this software will demonstrate a powerful and generalizable approach, for archives to both cater to the new scientific needs of communities they serve and maximize their scientific legacies. To learn more about this project: ☞ visit&nbsp;my github repository where the software has been uploaded for public use! ☞ view our poster presented at the 19th Divisional Meeting of the High Energy Astrophysics Division of the AAS -- more info available here. https://research.edengirma.me/black-star Sun, 30 Jan 2022 03:25:56 +0000 eden girma | research https://research.edengirma.me/black-star