Central kpc of NGC 1097: Migration of a circumnuclear ring and new ALMA results
by
Nuria Piñol Ferrer
→
Europe/Stockholm
FA31
FA31
Description
How are starburst and active nuclei triggered and sustain in disc galaxies? How is the secular evolution of these galaxies and how does it affect to these phenomena? Disc galaxies harbour very large quantities of gas, but not all of it is used to accrete super massive black holes or to from stars, why is that?
We present a detailed study of the prototype barred Seyfert galaxy NGC 1097 in order to answer these questions. NGC 1097 is a galaxy that presents a strong bar that ends in a circumnuclear ring where burst of star formation are located. We have compelling evidence of a inward migration of this ring from the outer Inner Lindblad resonance, what may give a hint about how stars are formed in this region. Inside the ring, nuclear spiral arms have been observed up to a inner radius of 40 pc, which are responsible in transporting the gas to the inner region. These spiral arms have been kinematically observed in new high resolution ALMA observations. These new observations support the scenario of a two-arm spiral density wave with an inferred pitch angle of 52◦ ± 4, already derived from ionised gas data.
