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Information from the Gaia Area Telescope reveals the unique core of the galaxy

Okay. The y-axis reveals the distinction between [M/H] estimates based mostly on XP spectra and APOGEE relying on AOkay APOGEE. There is no such thing as a proof of any systematic pattern in ∆[M/H] with AOkay as much as an absorption stage that corresponds to AV ≈ 3. Credit score & Copyright: Hans-Walter Ricks et al., Poor Outdated Coronary heart of the Milky Manner, arXiv: 2209.02722 [astro-ph.GA] https://arxiv.org/abs/2209.02722″ width=”422″ top=”530″/>

Above: Checking our [M/H] estimates based mostly on Gaia XP knowledge relying on precise [M/H] from APOGEE. Backside: (in)sensitivity [M/H] estimates earlier than extinction, ATo. The y-axis reveals the distinction between [M/H] estimates based mostly on XP spectra and APOGEE relying on APOGEE ATo. There is no such thing as a proof of any systematic pattern in ∆[M/H] with ATo to the extinction stage that corresponds to AAT ≈ 3. Credit score & Copyright: Hans-Walter Ricks et al., Poor Outdated Coronary heart of the Milky Manner, arXiv:2209.02722 [astro-ph.GA] https://arxiv.org/abs/2209.02722

A world workforce of researchers has found the unique core of the Milky Manner galaxy. They wrote a paper describing their discover and posted it on the arXiv preprint server.

Astronomers have lengthy assumed that the core of a star virtually definitely exists on the middle of the Milky Manner galaxy, however to this point they’ve been unable to search out proof. On this new work, researchers have risen to the problem by analyzing knowledge from the Gaia area telescope. The speculation additionally recommended that if there have been stellar cores on the middle of the galaxy, they had been prone to include a lot much less metallic than different stars as a result of they will need to have shaped earlier than such metals had been scattered over the area the place the Milky Manner shaped (roughly 12.5 billion years in the past).

Thus, they’re prone to be composed primarily of helium and hydrogen. Looking just for stars that fall into this class has narrowed issues down a bit – as have theories which have lengthy recommended that if there’s a stellar core on the middle of the galaxy, it’s almost definitely within the constellation Sagittarius, since it’s situated in what seems to be the middle of the disk. that makes up the galaxy. This nonetheless pressured the workforce to sift by way of roughly 2 million stars, which is definitely a problem. However because of laptop assist and perseverance, they discovered what they had been searching for – a cluster of about 18,000 stars on the middle of the Milky Manner galaxy. The researchers notice that stars within the cluster have lower than 3% metallic concentrations than stars farther away.

To additional take a look at the star cluster, the researchers famous its motion relative to different stars round it, in addition to pinpointing the placement of what must be the middle of the galactic disk. In addition they accounted for stars blocked by mud or different objects. Satisfied that that they had discovered the guts of the Milky Manner, they took measurements and located that the cluster made up solely 0.2% of the mass of the galaxy.


Picture: Hubble captures the globular cluster Terzan 9


Further Info:
Hans-Walter Rix et al., The Poor Outdated Coronary heart of the Milky Manner, arXiv:2209.02722 [astro-ph.GA] arxiv.org/abs/2209.02722

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Quote: Gaia Area Telescope knowledge displaying the unique galactic core (2022 Sep 23) obtained Sep 23, 2022 from https://phys.org/information/2022-09-gaia-space-telescope-reveals-galaxy .html

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