The Nature and Likely Redshift of GLEAM J0917-0012
| Autor: | Drouart, Guillaume, Seymour, Nick, Broderick, Jess W., Afonso, José, Chhetri, Rajan, De Breuck, Carlos, Emonts, Bjorn, Galvin, Tim J., Lehnert, Matthew D., Morgan, John, Stern, Daniel, Vernet, Joël, Wright, Nigel |
|---|---|
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | 2021PASA...38...49D |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1017/pasa.2021.35 |
| Popis: | We previously reported a putative detection of a radio galaxy at z=10.15, selected from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. The redshift of this source, GLEAM J0917-0012, was based upon three weakly detected molecular emission lines observed with the Atacama Large Millimetre Array (ALMA). In order to confirm this result, we conducted deep spectroscopic follow-up observations with ALMA and the Karl Jansky Very Large Array (VLA). The ALMA observations targeted the same CO lines previously reported in Band 3 (84-115GHz) and the VLA targeted the CO(4-3) and [CI(1-0)] lines for an independent confirmation in Q-band (41 and 44GHz). Neither observation detected any emission lines, removing support for our original interpretation. Adding publicly available optical data from the Hyper Suprime-Cam survey, WISE and Herschel Space Observatory in the infrared, as well as <10GHz polarisation and 162MHz inter-planetary scintillation observations, we model the physical and observational characteristics of GLEAM J0917-0012 as a function of redshift. Comparing these predictions and observational relations to the data, we are able to constrain its nature and distance. We argue that if GLEAM J0917-0012 is at z<3 then it has an extremely unusual nature, and that the more likely solution is that the source lies above z=7. Comment: 19 pages, 6 figures, published in PASA |
| Databáze: | arXiv |
| Externí odkaz: |
|