Astrophysicist | Ex @UCPH_Research @mpi_astro @Stockholm_Uni @ObsStrasbourg @UnivofDelhi |
Copenhagen
Joined June 2015
- Tweets774
- Following106
- Followers507
- Likes480
Pinned Tweet
Discovery of two stellar structures in the orbit-metallicity space of our Galaxy. Shiva & Shakti appear to be two of those early, massive fragments that coalesced ~12 Gyr ago, forming the proto-Milky Way. Published in ApJ. arxiv.org/abs/2403.13051 @ESAGaia @APOGEEsurvey @mpi_astro
Milky Way’s Metal-Poor Stars display Chemical Transition near the Solar Radius. Accepted in ApJL. arxiv.org/abs/2508.08360
Results obtained using the data from @ESAGaia and @APOGEEsurvey .
1
129
Our paper made it to the “Selections from 2024” series that looks back at some of the most-read AAS journal articles published in 2024!
Selections from 2024: Possible Proto-Galactic Fragments in the Milky Way
Two stellar structures discovered in the Milky Way this year may be fragments of proto-galaxies that formed before our galaxy was assembled. aasnova.org/2024/12/23/selec…
1
154
A schematic overview of MW-mass satellite systems in Local group and beyond (taken from arxiv.org/pdf/2404.14498)
#dwarfgalaxies2024 conference in #Durham
The GD-1 stream surrounded by a "stellar cocoon" in the @desisurvey data!
By @monica_valluri et al.
The GD-1 stream shows clear evidence of a broader hotter “cocoon” in DESI Early Release data: arxiv.org/pdf/2407.06336! More data on the way.
Evolution of merger stars in the (Lz, E) space of a Milky Way analog in the TNG 50 cosmological simulation.
youtube.com/watch?v=qGNtSWwk…
The Gaia-Sausage/Enceladus stars, which were previously hypothesized to have originated from an ancient (8-11 Gyrs ago) merger event, likely came from a more recent (< 3 Gyrs ago) event, now dubbed as the Virgo Radial Merger (VRM).
📢 @ESAGaia reveals that the Milky Way’s last major collision was surprisingly recent!
Gaia unravels our history by studying the wrinkles created by collisions, but there's a catch. Like Benjamin Button, our galaxy is getting less wrinkly over time 👉 esa.int/Science_Exploration/…
ALT Artist impression of our galaxy from the side, split into two parts with a vertical white line. The line runs through the centre of the image where stars of our Milky Way take on a UFO shape. The UFO consists of a central bright orb surrounded by a slightly less bright disc. Thousands of small dots surround the UFO-shape, these are the stars in the Milky Way halo. The left part of the image shows these white dots clustered closer to the central UFO with some density variations. The right part of the image has the white dots spread out uniformly across a larger halo. In the background tens of stars pop out as bright white dots with plus-shaped diffraction spikes.
A webinar I gave @Swinburne, hosted by Prof. Duncan A. Forbes, on "The LMS1 stellar stream: A very metal-poor fossil remnant of our Galaxy's formation".
youtube.com/watch?v=6mtrAz5l…
6
273
A talk I gave for the "@IAU_org Commission H1 - The Local Universe" seminar, on the topic "Atlas of Milky Way mergers created using the @ESAGaia dataset".
youtu.be/soabSPRFims?t=129
Galactic map of #StellarStreams detected in the @ESAGaia dataset. Each star in the stream represents an actual Gaia source, color-coded by heliocentric distance (as computed by the STREAMFINDER algorithm): blue for nearer (~1 kpc) and red for distant (>~30 kpc).
Visualization of Shiva & Shakti stellar structures in our Milky Way galaxy @StefanPWinc @mpi_astro @HdAstro
Published in ApJ. arxiv.org/abs/2403.13051
youtube.com/watch?v=0R1mHTvo…
Shiva and Shakti made it to the @CNN, thanks to @CNNAshley @mpi_astro @ESAGaia
edition.cnn.com/2024/03/21/w…
Last week attended the conference "Stars to Galaxies II" @chalmersuniv Gothenburg. #Astronomy #Sweden – at Gothenburg, Sweden
6
Euclid said in 300BC (to King Ptolemy): "There is no royal road to geometry, my majesty". Today, maybe we can rephrase this original statement (in the context of @ESA_Euclid) as "There is no royal road to the geometry of the Universe; but it's still totally worth it".
#euclid2022 – at Oslo, Norway
Euclid Consortium meeting 2022 happenimg this week in #Oslo. Large audience - 330 in person and other 300 joining virtually.
#Euclid2022 #ECMeeting2022 @ESA_Euclid @astrofysikk @EC_Euclid
1
4
Euclid spacecraft grows as EYES MEET BRAIN!
esa.int/Science_Exploration/…
1
I'm excited about my first 'single-author' paper, now accepted for publication in ApJ. I study the characteristics of the "Pontus" merger of the Milky Way using #GaiaEDR3 and @APOGEEsurvey data.
arxiv.org/abs/2204.09058
@ESAGaia @mpi_astro @AvHStiftung @IAU_org @The_Gruber_Fdtn
1> Pontus was recently discovered as a grouping of ~7 globular clusters in the action (J) and energy (E) space; arxiv.org/abs/2202.07660. These GCs also show a tight age-metallicity relation – again supporting the accretion scenario from a gradually enriched satellite galaxy.
1
3
WOAH! Our work got picked up by @ScienceMagazine.
Really cool story by @DanClery from @NewsfromScience.
Magnificient illustration by @StefanPWinc.
@HdAstro @mpi_astro @ESAGaia @ObsStrasbourg
science.org/content/article/…
Here is a video that nicely summarises our work (by T.Mueller from @mpi_astro)
youtube.com/watch?v=A_VzKjTi…
The 2nd key result of our paper: The 3 most metal-poor streams of the Milky Way – "C-19" (FeH=-3.4), "Sylgr" (FeH=-2.9), "Phoenix" (FeH=-2.7) - are associated with the “LMS-1/Wuk.” merger, showing it to be the most metal-poor merger of our Galaxy.
arxiv.org/abs/2202.07660
1
3
