INAF - Astronomical Observatory of Padova

INAF - Astronomical Observatory of Padova is one of the main structures of the National Institute of Astrophysics (INAF). The main activity of the Observatory is to perform scientific research in various  fields of Astrophysics. The Observatory also contributes to  advanced education, assists in the dissemination of knowledge and implements project of education and outreach of Astronomy.

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INAF - Osservatorio Astronomico di Padova


Seminario Dr. Martin Lopez-Corredoira
17.10.2019 - 17.10.2019
Aula L. Rosino - Dipartimento di Fisica ed Astrono - Padova



Giovedi 17 Ottobre 2019, h. 11:30 

 Aula L. Rosino Dipartimento di Fisica e Astronomia

  Martin Lopez-Corredoira 

IAC, Spain


Morphology, kinematics and dynamics of the Milky Way outer disc




The Milky Way disc presents a warp, a flare, lopsidedness and other deviations from a purely axisymmetrical double exponential density component, both for the stellar and the gas component. Moreover, recent large-scale extended kinematics maps of Gaia data have shown significant departures from circularity in the mean orbits with radial Galactocentric velocities between -20 and +20 km/s and vertical velocities between -10 and +10 km/s, asymmetries northern/southern and other anomalies.
The observed features are sensitive to internal and external forces, especially in the largest Galactocentric distances. Here we review some of the Galactic dynamics hypotheses that explain them: either in terms of gravitational interaction, magnetic fields, accretion of intergalactic matter or others. The gravitational interaction may be among the different components of the Galaxy or between the Milky Way and another companion galaxy. The accretion of intergalactic matter may be either into the halo, with a later gravitational interaction between the misaligned halo and the disc, or directly onto the disc.
Most of the relevant observations are explained in terms of an accretion of intergalactic matter onto a disc that is far from a simple stationary configuration in rotational equilibrium. Other hypotheses only partially explain some observations.



Aula L. Rosino - Dipartimento di Fisica ed Astrono
vicolo dell'Osservatorio 2


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