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We present the detection at 89 $\mu$m (observed frame) of the {\itHerschel}-selected gravitationally lensed starburst galaxy HATLASJ1429-0028(also known as G15v2.19) in 15 minutes with the High-resolution AirborneWideband Camera-plus (HAWC+) onboard the Stratospheric Observatory for InfraredAstronomy (SOFIA). The spectacular lensing system consists of an edge-onforeground disk galaxy at $z$ = 0.22 and a nearly complete Einstein ring of anintrinsic ultra-luminous infrared galaxy at $z$ = 1.03. Is this high IRluminosity powered by pure star formation (SF) or also an active galacticnucleus (AGN)? Previous nebular line diagnostics indicate that it isstar-formation dominated. We perform a 27-band multi-wavelength spectral energydistribution modeling (SED) including the new SOFIA/HAWC+ data to constrain thefractional AGN contribution to the total IR luminosity. The AGN fraction in theIR turns out to be negligible. In addition, J1429-0028 serves as a testbed forcomparing SED results from different models/templates and SED codes (MAGPHYS,SED3FIT, and CIGALE). We stress that star formation history is the dominantsource of uncertainty in the derived stellar mass (as high as a factor of$\sim$ 10) even in the case of extensive photometric coverage. Furthermore, thedetection of a source at $z$ $\sim$ 1 with SOFIA/HAWC+ demonstrates thepotential of utilizing this facility for distant galaxy studies including thedecomposition of SF/AGN components, which cannot be accomplished with othercurrent facilities.

SOFIA/HAWC+ detection of a gravitationally lensed starburst galaxy at $z$ = 1.03