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The inclined structures of the Galactic subsystems

The inclined structures of the Galactic subsystems. Shatsova R.B., Anisimova G.B. South Federal University. subsystems in the Galaxy. questions Is the transition from one subsystem to another continuous, fluent, or discrete, by bound? How many subsystems : 2 – 3- 4- 5?

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The inclined structures of the Galactic subsystems

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  1. The inclined structures of the Galactic subsystems Shatsova R.B., Anisimova G.B. South Federal University

  2. subsystems in the Galaxy questions • Is the transition from one subsystem to another continuous, fluent, or discrete, by bound? • How many subsystems : 2 – 3- 4- 5? • What are their structure and parameters? • The form: flat – parallel to the galactic equator, or the inclination is possible? • How are the subsystems combined with differential galactic rotation?

  3. many inclined belts • the Gould Belt • the Vaucouleurs - Dolidze Belt, • the Magellanic Stream, • etc The Galaxy is formed of the inclined structures

  4. stellar distribution < upto 9m -SAO cat

  5. (l, b) = (3, 3) n >n + n • Their distribution over the sky is not chaotically. • The large clusters in each spectral class and the clusters of clusters are distinguished in this figure, and their majority is not parallel to the plane of Galaxy. • The powerful structures  to this plane are most strike. • And this peculiarity is typical not only for the stellar distribution.

  6. IRAS sources in = 60m around the centre of Galaxy (r~30) MW, Г, F and E outlined sharply

  7. the dangerexists to destroy the inclined Local System in the conditions of differential galactic rotation. • the matter is not only in the age • According to some data the Oort constant of galactic rotation A0 for Gould belt. • As A= –½R0 (d/dR)0 Gould belt have not at all the differential rotation, but only solid, having the angular velocity 0 • The observed A0 can mean the existence of some additional Belt’s motion, neutralizing or balancing the A=15km/s effect in the general rotation.

  8. In the known formulas • vr=A r sin2l cos2b – X cosl cosb – Ysinl cosb – Z sinb + K r cosb + vr+ • l=A (1+cos2l) cosb /k – 0 cosb /k – X /kr + Y cosl /kr + l+ • k=4,74; (X, Y, Z) – the Sun velocity components, K –member of expansion, • The additional motion marked as vr+ ,l+ . It can be obtained in the differences of the mean vr and l in the symmetrical to MW sky areas: (l, b) and (l,-b), that is N-S asymmetry.

  9. The galactic rotation and (X, Y) – parallactic motion are completely excluded in the differences • vr– 2Z sinb = vr+ • l = l+ • Z= 6 or 7 km/s.

  10. inclined stellar belts Г-F (i=30) and E-F(i=60) • observations used from the compilative catalogue of Goncharov

  11. inclined stellar belts Г-F (i=30) and E-F(i=60) observations: catalogue of Goncharov; OB stars (i=0) over Gozha

  12. If vr + = 0 and  l + = 0 additional motion =0, But the systematical deviations from the expected 0 on longitude l take place, similar to the double-waved sinusoid. The amplitudes are larger, than in the galactic rotation, The curves for the pairs of inclined belts slightly differ between themselves. It means the dependence on b or i.

  13. there is some inclined common motion, having differences for N – S not smaller, than the effect of galactic rotation. It is not known yet this motion itself. But obviously, it may compensate the differential galactic rotation.

  14. So, the surviving of the inclined structures depends neither on differential rotation, nor on the age. • The i - inclination angle of structure to MW can be attributed to the subsystem parameters. The structures, having i in some limits can be attributed to the one and same subsystem. The boundaries between the subsystems are the skirting of the belts, having the same i, but different knots .

  15. Conclusions • There are a lot of inclined structures in the Galaxy • The Oort constant A0 means the stability of Gould Belt • Several other belts have the motions, resisting the differential rotation of the Galaxy • The inclined structures can be attributed either to the known or to the new subsys-tems, according to the inclination angle i

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