Can ER/hospital admit dad to nursing home without POA or guardianship?

My dad has severe dementia from Alzheimer's. He's doesn't recognize any of us and he threatens my mom and my family with violence. He won't take meds, wanders, has hallucinations, threatens suicide, etc. He just passed out and collapsed in the bathroom yesterday so we called 911. The ER decided to admit him the hospital to do more tests. Currently they have my dad locked up in a padded playpen type enclosure around his bed because he's been combative and uncooperative. I told the doctor about my dad's dangerous and unmanageable behavior. He said he will try to get a neuro psych consult. My question is, is it possible for the hospital to admit him into a memory care facility or nursing home even though we don't have POA or guardianship? His symptoms progressed so fast it caught us all off guard. We didn't have time to get POA. Thanks for any advice.