SOFIA/HAWC+ Detection of a Gravitationally Lensed Starburst Galaxy at z = 1.03

Ma, Jingzhe; Brown, Arianna; Cooray, Asantha; Nayyeri, Hooshang; Messias, Hugo; Timmons, Nicholas; Staguhn, Johannes; Temi, Pasquale; Dowell, C. Darren; Wardlow, Julie; Fadda, Dario; Kovacs, Attila; Riechers, Dominik; Oteo, Ivan; Wilson, Derek; Perez-Fournon, Ismael

Abstract

We present the detection at 89 μm (observed frame) of the Herschel-selected gravitationally lensed starburst galaxy HATLAS J1429-0028 (also known as G15v2.19) in 15 minutes with the High-resolution Airborne Wideband Camera-plus (HAWC+) onboard the Stratospheric Observatory for Infrared Astronomy (SOFIA). The spectacular lensing system consists of an edge-on foreground disk galaxy at z = 0.22 and a nearly complete Einstein ring of an intrinsic ultra-luminous infrared (IR) galaxy at z = 1.03. Is this high IR luminosity powered by pure star formation (SF) or also an active galactic nucleus (AGN)? Previous nebular line diagnostics indicate that it is star formation dominated. We perform a 27-band multiwavelength spectral energy distribution (SED) modeling including the new SOFIA/HAWC+ data to constrain the fractional AGN contribution to the total IR luminosity. The AGN fraction in the IR turns out to be negligible. In addition, J1429-0028 serves as a testbed for comparing SED results from different models/templates and SED codes (magphys, sed3fit, and cigale). We stress that star formation history is the dominant source of uncertainty in the derived stellar mass (as high as a factor of ~10) even in the case of extensive photometric coverage. Furthermore, the detection of a source at z ~ 1 with SOFIA/HAWC+ demonstrates the potential of utilizing this facility for distant galaxy studies including the decomposition of SF/AGN components, which cannot be accomplished with other current facilities.

Citation

Ma, J., Brown, A., Cooray, A., Nayyeri, H., Messias, H., Timmons, N., …Perez-Fournon, I. (2018). SOFIA/HAWC+ Detection of a Gravitationally Lensed Starburst Galaxy at z = 1.03. Astrophysical Journal, 864(1), Article 60. https://doi.org/10.3847/1538-4357/aad4a0

• Journal Article Type: Article
• Acceptance Date: Jul 17, 2018
• Online Publication Date: Aug 30, 2018
• Publication Date: Aug 30, 2018
• Deposit Date: Sep 21, 2018
• Publicly Available Date: Sep 21, 2018
• Journal: Astrophysical Journal
• Print ISSN: 0004-637X
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 864
• Issue: 1
• Article Number: 60
• DOI: https://doi.org/10.3847/1538-4357/aad4a0
• Public URL: https://durham-repository.worktribe.com/output/1319198