NOAO >   Observing Info >   Approved Programs >   2018A-0077

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Program Information for 2018A-0077


PI: Mischa Schirmer, Gemini Observatory, schirmer@mpia.de
Address: Gemini Observatory, Colina El Pino s/n, La Serena Chile

CoI: Kohei Ichikawa, Columbia U.
CoI: Taiki Kawamuro, NAOJ
CoI: Rebecca Davies, Max-Planck-Institut fuer extraterrestrische Physik
CoI: James Turner, Gemini Observatory
CoI: Claudio Ricci, Pontificia Universidad Catolica de Chile
CoI: Sangeeta Malhotra, Arizona State U.
CoI: Hai Fu, U. of Iowa
CoI: Nancy Levenson, STScI
CoI: William Keel, University of Alabama
CoI: Paul Torrey, Harvard-Smithsonian Center for Astrophysics

Title: Thermal echoes from the fading AGN in low-redshift Lyman-alpha blobs

Abstract: Lyman-alpha blobs (LABs) are among the most luminous nebulae known in the Universe. We have shown in 2016 that they can still exist at low redshifts of z~0.3, where they are ionized by AGN. We have identified far-UV and optical ionization echoes, showing that the AGN in these LABs must have faded dramatically over the last 1,000-100,000 years. The dusty tori around AGN have a similar delayed response to a change in AGN luminosity, and on shorter time scales than the UV/optical echoes. Their thermal response depends strongly on wavelength and the structural parameters of the torus. Using multi-wavelength NIR and MIR observations, we create and compare long-term thermal light curves for the fading AGN in the low-z LABs, constraining the tori's structural parameters and compositions. This proposal obtains the restframe NIR data using NIRI L-band imaging.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2018A):  GEM-NQ/NIRI -- 31.5hrs band 3 (GN-2018A-Q-306 )


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 >   2018A-0077

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