NOAO >   Observing Info >   Approved Programs >   2017A-0269

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Program Information for 2017A-0269


PI: Frederick Hamann, UC Riverside, fhamann@ucr.edu
Address: Department of Physics, Riverside, CA, 92521 USA

CoI: David Rupke, Rhodes College
CoI: Todd Tripp, U. Mass
CoI: Sylvain Veilleux, U. of Maryland

Title: Monitoring the Extraordinary Transient Outflow in the Quasar PG1411+442

Abstract: Accretion disk outflows are a fundamental part of the quasar phenomenon that might play a role in feedback to host galaxy evolution. In 2015, we discovered the remarkable emergence of a unique transient outflow that produces HUNDREDs of weak blended absorption lines across the rest-frame UV of the quasar PG1411+442 (z=0.89). Subsequent Gemini observations with GMOS (2015) and GRACES (2016) revealed an unprecedented variety of absorption lines in the visible: the HI* Balmer lines, HeI* 5876, NaI D, and many FeII* lines from excited states up to 3.9eV, all at blueshifted velocities ~1900 km/s and widths of only ~100 km/s. They identify a small outflow structure that covers only ~20% of the continuum source with enormous column density N_H > 10^23 cm^-2. Line variability in our followup observations suggests that this outflow is crossing our lines of sight at speeds >1000 km/s and distances <~1 pc from the central quasar. This unique transient outflow provides a unique opportunity to study the structure and origins of quasar outflows and their possible relationships to the broad emission line regions. We request 1.0 hrs with Gemini GRACES to follow the evolution of this outflow to place better constraints on its location, spatial structure, dynamics, and overall physical conditions.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2017A):  GEM-N-SVC/GRACES -- 1hrs band 2 (GN-2017A-Q-46)


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2017A-0269

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