[galaxy] clean memory when leaving + local sfr

galaxy.py

@@ -143,14 +143,14 @@ def get_time_from_relax(pp):
     return tfromrelax
 
 
-def get_last_sfr(pp):
+def get_last_sfr(pp, r=4, dr=0.5):
     pp.load_parts()
     try:
         epoch = pp.parts["epoch"].copy()
         epoch *= pp.info["unit_time"].express(U.year)
         mass = pp.parts["mass"].copy()
         mass *= pp.info["unit_mass"].express(U.Msun)
-        mask = epoch > 0
+        mask = (epoch > 0) & (np.abs(pp.parts["r"] - r) < dr)
         masstot, time = np.histogram(epoch[mask], weights=mass[mask], bins=100)
         dtime = np.diff(time)
         sfr = masstot[-1] / dtime[-1]
@@ -181,4 +181,10 @@ def allinone(pp):
     for key in ring:
         for i, fluid in enumerate(["gas", "dm", "stars"]):
             res[f"{key}_{fluid}"] = ring[key][i]
+
+    pp.unload_cells()
+    pp.unload_parts()
+    del pp.dm
+    del pp.gas
+    del pp.stars
     return res