English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present the first use of the Gemini North laser guide star adaptive optics(LGS AO) system and an integral field unit (IFU) to measure the stellarvelocity dispersion of the host of a luminous quasar. The quasar PG1426+015(z=0.086) was observed with the Near-Infrared Integral Field Spectrometer(NIFS) on the 8m Gemini North telescope in the H-band as part of the ScienceVerification phase of the new ALTAIR LGS AO system. The NIFS IFU and LGS AO arewell suited for host studies of luminous quasars because one can achieve alarge ratio of host to quasar light. We have measured the stellar velocitydispersion of PG1426+015 from 0.1'' to 1'' (0.16 kpc to 1.6 kpc) to be 217+/-15km/s based on high signal-to-noise ratio measurements of Si I, Mg I, andseveral CO bandheads. This new measurement is a factor of four more precisethan a previous measurement obtained with long-slit spectroscopy and good,natural seeing, yet was obtained with a shorter net integration time. We findthat PG1426+015 has a velocity dispersion that places it significantly abovethe M-sigma relation of quiescent galaxies and lower-luminosity active galacticnuclei with black hole masses estimated from reverberation mapping. We discussseveral possible explanations for this discrepancy that could be addressed withsimilar observations of a larger sample of luminous quasars.

First Stellar Velocity Dispersion Measurement of a Luminous Quasar Host with Gemini North Laser Guide Star Adaptive Optics