Astronomer at @CarnegieAstro ⭐️ @NASA Hubble Fellowship Program 🚀 PhD from @ourANU 🔭 Irrational love for globular clusters & stellar spectroscopy ✨ (she/her)
Ngambri & Ngunnawal country
Joined December 2017
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Globular Clusters "are undoubtedly the most interesting objects in the heavens"
- William Herschel 1814, Philosophical Transactions, 104, 248
(found in the Gratton et al. 2019 review)
I never could have predicted how my first week at Carnegie would unfold. The Eaton fire destroyed structures 2.5 km away from the Pasadena offices. Soot falls like rain, and hazardous smoke fills every office. An incomprehensible number of people have lost everything.
🎉👩💻 First day of school 🔭🎉
After working remotely from Australia for the last few weeks, I’m beyond excited to start in person at the Carnegie Observatories 🌴
Madeleine McKenzie retweeted
interrupting your scrolling to show you my first first-author paper that has just been published 🤸♀️
iopscience.iop.org/article/1…
This work is titled [X/Fe] Marks the Spot: Mapping Chemical Azimuthal Variations in the Galactic Disk with APOGEE 🗺️
Let's get into it 🧵
Madeleine McKenzie retweeted
#SpaceImageOfTheDay: Globular Star Cluster NGC 6752
Image Credit & Copyright: Massimo Di Fusco, and Aygen Erkaslan
#APOD #Perth #WA #space #spacenews #perthnews #wanews #communitynews
Madeleine McKenzie retweeted
I'm back with another new Milky Way satellite galaxy from the DELVE survey! Introducing Aquarius III: arxiv.org/abs/2410.00981. We argue it's interesting because of its cold velocity dispersion + orbit which keeps it far from the disk plane --> formed in a very-low-mass DM halo?
‼️GALAH DR4 IS LIVE ‼️
Huge congratulations to @astro_sven for the monumental effort required to make the DR4 dream a reality ✨
Globular cluster summary 🧵will be coming in a few days 💫
GALAH DR4 is now public! 10 years of observations, 995 nights (incl. rainy/snowy/cloudy ones), 32 elements (incl. nitrogen), 0.92 Mio. stars, 1.09 Mio. spectra, thanks to an amazing group of observers, engineers, and astronomers. Paper: arxiv.org/abs/2409.19858 with links to data.
ALT The Gaia DR3 all-sky colour view of the Milky Way with the 0.92 millions stars observed as part of GALAH DR4 shown as coloured points across the Southern sky.
Madeleine McKenzie retweeted
In 1716, English astronomer Edmond Halley noted, "This is but a little Patch, but it shows itself to the naked Eye, when the Sky is serene and the Moon absent." Of course, M13 is now less modestly recognized as the Great Globular Cluster in Hercules, one of the brightest globular star clusters in the northern sky. Sharp telescopic views like this one reveal the spectacular cluster's hundreds of thousands of stars. At a distance of 25,000 light-years, the cluster stars crowd into a region 150 light-years in diameter. Approaching the cluster core, upwards of 100 stars could be contained in a cube just 3 light-years on a side. For comparison, the closest star to the Sun is over 4 light-years away. The deep, wide-field image also reveals distant background galaxies including NGC 6207 at the upper left, and faint, foreground Milky Way dust clouds known to some as integrated flux nebulae.
Image Credit & Copyright: Jan Beckmann, Julian Zoller, Lukas Eisert, Wolfgang Hummel
🎉🎉 PhD finished 🎉🎉
Thank you to all the wonderful people who supported me (literally) on this journey 💖
Madeleine McKenzie retweeted
A cool trick I recently learned is that if you synch your overleaf to a dropbox account, you can make local changes and have them mirrored in your overleaf repository automatically. Handy when no WIFI, and also allows you to edit files in neovim locally if you are one to do so.
Madeleine McKenzie retweeted
Paper summary!!! On Monday, @astrobystrom and I put out this cool work: arxiv.org/abs/2408.17250 selecting red giants stars out to 100 kpc using the Pristine survey's data release 1 and Gaia XP catalogues. Here is a short summary of this long (sorry!) paper 🥳
Madeleine McKenzie retweeted
It’s paper day! arxiv.org/abs/2408.13763
We characterise the local halo substructures (Thamnos and Sequoia) as part of the ChronoGal project by fitting their absolute colour-magnitude diagrams using CMDft.Gaia, obtaining age and metallicity distributions! 🌟
Procrastinating writing my thesis by making a very simple animation for Steph Monty's new paper ⭐️🔭 Feedback/suggestions welcome 💫
📄available here: ui.adsabs.harvard.edu/abs/20…
🚨 GAME CHANGER PAPER ON ARXIV 🚨
The wonderful Steph Monty has discovered that globular clusters trace the chemical evolution of their host galaxy 🌌 Looking at the accreted stars in the Milky Way, the accreted globular follow the same track 🤯 ( a 🧵) arxiv.org/abs/2405.08963
This is important for studying stellar nucleosynthesis ⚛️ supernova yields 🌟 and neutron star merger rates ✨ in the early Universe. And it works for more than just the Milky Way 😮 Look how well it fits the chemical evolution models for the Sgr dwarf ♐️
The AMP-UP program was *the* most helpful resource when I was applying for postdocs. I was so lucky to have Kaley as my mentor 🤩 I couldn’t have asked for a more patient, thoughtful and kind person to help me navigate the process 🥰 10/10 recommend ✨
Are you applying to postdocs in astro this year? Join AMP-UP, our mentorship program, for help with your applications!
Current prize postdocs fellows including myself will help edit proposals, brainstorm ideas, and more: aas.org/posts/news/2024/05/m…
Madeleine McKenzie retweeted
Almost all black holes seem to come in two sizes: small or supermassive.
But Hubble's on the hunt for elusive "medium" black holes.
Intermediate-sized black holes (100 to 100,000 times the mass of our Sun) have long been theorized about: go.nasa.gov/4buKg00 ⬇️
ALT Thousands of bright points of light on a black background fill the field of view. They appear somewhat more concentrated near the center of the image. They have a variety of colors, with the most prominent stars appearing blue or yellow-orange. The brighter stars also display four diffraction spikes.