Growing supermassive black holes ( \sim 10 ^ { 9 } \mathrm { ~ { } \mathrm { M } _ { \odot } } ) that power the luminous z > 6 quasars from light seeds - the remnants of the first stars - within a Gyr of the Big Bang poses a timing challenge .
The formation of massive black hole seeds via direct collapse with initial masses \sim 10 ^ { 4 } -10 ^ { 5 } ~ { } \mathrm { M } _ { \odot } alleviates this problem .
Viable direct collapse black hole ( DCBH ) formation sites , the satellite halos of star-forming galaxies , merge and acquire stars to produce a new , transient class of high redshift objects , Obese Black hole Galaxies ( OBGs ) .
The accretion luminosity outshines that of the stars in OBGs .
We predict the multi-wavelength energy output of OBGs and growing Pop III remnants at ( z = 9 ) for standard and slim disk accretion as well as high and low metallicities of the associated stellar population .
We derive robust selection criteria for OBGs - a pre-selection to eliminate blue sources followed by color-color cuts ( [ F _ { 090 W } - F _ { 220 W } ] > 0 ; -0.3 < [ F _ { 200 W } - F _ { 444 W } ] < 0.3 ) and the ratio of X-ray flux to rest-frame optical flux ( F _ { X } / F _ { 444 W } > > 1 ) .
Our cuts sift out OBGs from other infra-red bright , high and low redshift contaminants .
OBGs with predicted M _ { AB } < 25 makes them unambiguously detectable by the Mid-Infra-Red Instrument ( MIRI ) , on the upcoming James Webb Space Telescope ( JWST ) .
For parameters explored here , growing Pop III remnants with predicted M _ { AB } < 30 will likely be undetectable by JWST .
We demonstrate that JWST has the power to discriminate initial seeding mechanisms .