Deepak Eappachen
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deepake.bsky.social
Deepak Eappachen
@deepake.bsky.social
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Observational Astrophysicist | Exploring cosmic transients | Postdoctoral Fellow at Indian Institute of Astrophysics | Former PhD candidate at SRON & Radboud University NL
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Reposted by Deepak Eappachen
emily.space
A very fascinating paper went up on the arXiv today!

Jesse Han & El-Badry et al. reanalysed the 21 known 'hypervelocity' stars in the #milkyway.

They find strong evidence that the LMC (Large Milky/Magellanic Cloud) has a supermassive black hole at its core! 🤯 arxiv.org/abs/2502.00102
A figure from the paper (Figure 4). It shows the locations of known hypervelocity stars as black circles, with the predicted overdensity that the LMC would cause shown in red. Full caption: Predicted on-sky overdensity of hypervelocity stars originating from a 6 × 105M⊙ supermassive black hole in the LMC. The black open circles denote the Galactic coordinates of hypervelocity stars detected in the HVS Survey, while the grey-shaded regions mark areas excluded from the survey. The current position of the LMC is illustrated with a representative image, and its orbital trajectory is drawn with a red arrow. The forward model incorporating an SMBH in the LMC along with the selection effects of the HVS Survey predicts a prominent overdensity of HVS in the region enclosed by the red contours. The overdensity arises because stars are boosted in the direction of the LMC’s orbit. This model accurately reproduces the observed overdensity location, supporting the hypothesis of an SMBH in the LMC as a source of these stars.
February 4, 2025 at 8:56 AM
Reposted by Deepak Eappachen
astrolaura.com
The amazing @esa.int Gaia telescope is taking its last measurements today

Gaia has had a tremendous impact on astronomy. Without the easy to access (and use) data releases, a lot of the work I do would be impossible

Thank you, Gaia and team! Can't wait for the future data releases! 🔭🧪
Artist's impression of the Gaia space telescope in front of the Milky Way. Gaia looks kind of like a sunhat. I've added a little halo above it. The Milky Way has a glowy centre and you can see the dusk tracks in the disk. You can also see the bright blobs of the Magellanic Clouds below the Milky Way
January 14, 2025 at 8:38 PM
Reposted by Deepak Eappachen
jmurthy.bsky.social
New novae discovered in Andromeda using archival UVIT data.🔭

www.thehindu.com/sci-tech/sci...
In a first, Indian Institute of Astrophysics astronomers spot ultraviolet emissions from novae in Andromeda galaxy
Astronomers from the Indian Institute of Astrophysics (IIA) have spotted far ultra violet (FUV) emissions from novae for the first time in the neighbouring Andromeda galaxy.
www.thehindu.com
December 9, 2024 at 3:24 PM