Andrei Ristea

Astrophysicist

[Andrei Ristea @AndreiRistea3]

My latest PhD paper on the:
- Circular Velocity
- Halo Mass
functions of galaxies
With @astroquokka @GalaxyGroves, @amelia_fmc, @dobreschkow and @karlglazebrook
Using IFS data from the @MaNGASurvey
has just been published in MNRAS @RAS_Journals
🧵 1/5
https://t.co/yRIS4LEiC6

[Andrei Ristea @AndreiRistea3]

The first paper of the Hector galaxy survey, to which I have had the pleasure of contributing, is on ArXiv!

Hector is on track to becoming the largest IFS Survey, when completed.

Check out the paper, describing the data processing & early science!

https://t.co/NpeIyJdnFN

[ICRAR @ICRAR]

We're thrilled to announce Tyrone O'Doherty and Andrei Ristea as the winners of the 2024 Ken & Julie Michael Prize.

https://t.co/ysY9oOsQE7

[Astro Plot of the Week @PlotAstro]

It is time to pick the newest "Astro Plot of the Week"!

Pick one:

- Plot from Ristea et al. (https://t.co/TS6d5qwtvA)

- Plot from Ye (2024) (https://t.co/9S3H2XbjU2)

Poll (below) is open for two days - vote!

[Andrei Ristea @AndreiRistea3]

@PlotAstro @PlotAstro
What about this plot from "The circular velocity and halo mass functions of galaxies in the nearby Universe", Ristea et al. 2024, recently published in MNRAS

https://t.co/MLqK8WGLaL

[Andrei Ristea @AndreiRistea3]

5/5🧵
The halo mass range probed resolves 72% (Ω_M = 0.227±0.018) of the matter density in the nearby Universe.
Our best-fitting HMF integrated to zero mass results in a matter density parameter Ω_M = 0.306±0.018/19, consistent with the latest results of the Planck Collaboration.

[Andrei Ristea @AndreiRistea3]

My latest PhD paper on the:
- Circular Velocity
- Halo Mass
functions of galaxies
With @astroquokka @GalaxyGroves, @amelia_fmc, @dobreschkow and @karlglazebrook
Using IFS data from the @MaNGASurvey
has just been published in MNRAS @RAS_Journals
🧵 1/5
https://t.co/yRIS4LEiC6

[Andrei Ristea @AndreiRistea3]

4/5🧵
We combine our HMF data with measurements from Hi kinematics (@PengfeiLi0606 et al 2019) and group velocity dispersions (Driver et al 2022).
We constrain the functional form of the HMF for log(Mhalo) btwn 10.5 – 15.5, finding a good agreement with ΛCDM predictions.

[ASTRO 3D @ARC_ASTRO3D]

#Breaking. Happens to us all, eventually, and galaxies are no exception.💫
Latest research by led by @ARC_ASTRO3D @USyd reports that age is the driving force in changing how stars move within galaxies. Read more at https://t.co/9Hw0ImRGbW
#astronomy #astrophysics #galaxies

[Andrei Ristea @AndreiRistea3]

doi:10.1092/mnras/stad3638

https://t.co/kffGxLK1qu

[Andrei Ristea @AndreiRistea3]

⭐️New paper⭐️

My paper on the Tully-Fisher relation is on ArXiv!

https://t.co/eCG078ezcX

🧵 1/3 We compute a compendium of TF relations for both stellar and gas rotation at different radii using the MaNGA Survey.

@astroquokka
@amelia_fmc

[Andrei Ristea @AndreiRistea3]

🧵 3/3 The scatter in the stellar & gas TF relations does NOT correlate strongly with: optical morphology, SF properties, environment or signs of recent has accretion.

[Caroline Bertemes @carobertemes]

A. Ristea on kinematic misalignements betwe gas & stars in SAMI:
Misaligned sources are largely quenched. Also 60% are LINERs, 8% have outflows & 15% are obvious mergers (AR+22). Others may be due to accretion or post-mergers without lingering merger signatures
#EASKrakow2023

[Andrei Ristea @AndreiRistea3]

I'm in Poland for the 2023 @EAS_meeting - I'll be presenting my work tomorrow morinig in:
SS20a about stellar-gas kienmatic misalignments SS19c about the stellar/gas Tully-Fisher relation
Come chat with me if this sounds interesting. #EASKrakow2023

[EAS Annual Meeting @EAS_meeting]

#EASKrakow2023 kicked off! Over 1500 astronomers gather this week in Kraków, Poland, to present and discuss the latest results in astronomy and space science.

[Amelia Fraser-McKelvie @amelia_fmc]

@AndreiRistea3 presenting his cool new results at the @ARC_ASTRO3D #scimeet23. The scatter in the Tully Fisher relation correlates well with stellar kinematics (stars), and v/sigma (gas).

[Dr Jess Thorne @_jessthorne]

🌟 New paper day! 🌟

https://t.co/IWmBy3hk2R

Can galaxy metallicities be measured from only broad-band spectral energy distributions (SEDs)?
🧵1/5