Table 2
Type of SN distribution.
| Type | nout |  |
 |
 |
 |
|---|---|---|---|---|---|
| [cm−3] | [M⊙] | [ × 10−5] | [ × 10−3] | [kyr] | |
| SN-ISM | 103 | 114 | 41.4 | 14.9 | 1070 |
| 104 | 21 | 5.2 | 3.0 | 846 | |
| 105 | 9 | 0.1 | 0.68 | 668 | |
| SN-NSC | 103 | 205 | 28.5 | 14.9 | 465 |
| 104 | 452 | 4.3 | 3.0 | 355 | |
| 105 | 1170 | 0.5 | 0.68 | 207 |
Notes. nout : the density of the ambient medium; 
: the average mass delivered into the central 1 pc region per SN exploding within the 100 pc from the SMBH;
: the fraction of volume inside 100 pc occupied by an average expanding SN shell in supersonic expansion;
: the fraction of volume inside 100 pc taken by the delivery region; 
: the average duration of SN shell.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.