[phas-dept] FW: [Faculty-talk] [Announce] more on Gaia

[Carlos Bertulani]

As well as this one.
carlos
From: <faculty-talk-bounces at physics.tamu.edu> on behalf of nsuntzeff <nsuntzeff at tamu.edu>
Date: Wednesday, April 25, 2018 at 12:42 PM
To: announce <announce at physics.tamu.edu>
Subject: [Faculty-talk] [Announce] more on Gaia

Dear All,

One of the early puzzles from Gaia is the following diagram. You are looking at the velocity components of the stars within 200pc, in the coordinate system of x (toward the Galactic center which has the “U” component which should be defined positive in the direction of the Galactic Center) and the y component toward the direction of rotation at the solar position. Since the sun is rotating into a non-rotating halo, the halo and thick disk stars will have highly negative velocities on the lower half of the diagram. The clumpiness near U=0 and V=-20 appears to be significant structure in the *disk* of our Galaxy. A good friend of mine, now passed away, Olin Eggen, discovered “moving groups” of stars which had similar kinematical properties. For many years he fought to get his ideas into the literature, and finally did, but with many astronomers skeptical of his results. I wish he were here to see this.

Some of these clumps must be the Hyades and the Pleiades groups which have been known for many years. But the others?


[cid:image002.png at 01D3DCC4.12A59AA0]



much more cool stuff at https://urldefense.proofpoint.com/v2/url?u=https-3A__www.cosmos.esa.int_web_gaia_home&d=DwIGaQ&c=oqyuZuih6ykib6aKiBq22_bich4AVfYGoLertJN0bEc&r=hjwEO_XYlnwAQWUGeaCrW47w4mK-Al28-BKyRvaivBs&m=9AwsXA3lLRmvfUCHyPpv-WHMJZWjusjcqb6tz3n9duE&s=iyJqLK5VRdnze1u_0-bzrBhr_Ja_Cj-OOtUykC1Vh_I&e=,



cheers nick
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.tamuc.edu/pipermail/phas-dept/attachments/20180425/33a55a6f/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.png
Type: image/png
Size: 236193 bytes
Desc: image002.png
URL: <http://mailman.tamuc.edu/pipermail/phas-dept/attachments/20180425/33a55a6f/attachment-0001.png>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: ATT00001.txt
URL: <http://mailman.tamuc.edu/pipermail/phas-dept/attachments/20180425/33a55a6f/attachment-0002.txt>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: ATT00002.txt
URL: <http://mailman.tamuc.edu/pipermail/phas-dept/attachments/20180425/33a55a6f/attachment-0003.txt>