The emblem of the Ramakrishna Math and Mission bears a part of some Gayatri Mantra that reads : TAN NO HAMSAH PRACHODAYAT
From which Gayatri is this part taken? Please cite proper scriptural source.
It can be one of the following three mantras:
Om hamsa hamsaya vidmahe param hamsaya dhimhai tanno hamsah prachodayat |
Om hamsaya vidmahe param hamsaya dhimahi tanno hamsah prachodayat |
Om param hamsaya vidmahe param tattvaya dhimahi tanno hamsah prachodayat |
All these three mantras are listed under Parabrahma Gayatris in the PDF Gayatri Worship (p 112)
At last I received the original mantra and source from a friend of mine who is a monk of the Ramakrishna order.
The Gayatri Mantra is a part of the Medha-Suktam (Taittiriya Aranyakam-4,prapatak-10,Anubak 41-44).
The Gayatri Mantra reads as
ॐ हंस हंसाय विद्महे परमहंसाय धीमहि तन्नो हंसः प्रचोदयात्
Here Hamsa is the Paramatma in the form of Surya.Because just the previous line reads 'Mayi Suryo bhrajo dadhatu.
Hamsa is a name of Surya as per the sanskrit dictionary also.
There is no name mentioned like 'हंस-गायत्री' by the way.