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

(Abridged) The two-dimensional distribution and kinematics of the molecular,ionized, and highly ionized gas in the nuclear regions of Seyfert 1 galaxieshave been measured using high spatial resolution (~0''.09) near-infraredspectroscopy from NIRSPEC with adaptive optics on the Keck telescope. Molecularhydrogen, H2, is detected in all nine Seyfert 1 galaxies and, in the majorityof galaxies, has a spatially resolved flux distribution. In contrast, thenarrow component of the BrG emission has a distribution consistent with that ofthe K-band continuum. In general, the kinematics of H2 are consistent with thindisk rotation, with a velocity gradient of over 100 km/s measured across thecentral 0''.5 in three galaxies, and across the central 1''.5 in two galaxies.The kinematics of BrG are in agreement with the H2 rotation, except in all fourcases the central 0''.5 is either blue- or redshifted by more than 75 km/s. Thehighly ionized gas, measured with the [Ca VIII] and [Si VII] coronal lines, isspatially and kinematically consistent with BrG in the central 0''.5. Dynamicalmodels have been fitted to the two-dimensional H2 kinematics, taking intoaccount the stellar mass distribution, the emission line flux distribution, andthe point spread function. For NGC 3227 the modeling indicates a black holemass of Mbh = 2.0{+1.0/-0.4} x 10^7 Msun, and for NGC 4151 Mbh =3.0{+0.75/-2.2} x 10^7 Msun. In NGC 7469 the best fit model gives Mbh < 5.0 x10^7 Msun. In all three galaxies, modeling suggests a near face-on diskinclination angle, which is consistent with the unification theory of activegalaxies. The direct black hole mass estimates verify that masses determinedfrom the technique of reverberation mapping are accurate to within a factor ofthree with no additional systematic errors.

Circumnuclear Gas in Seyfert 1 Galaxies: Morphology, Kinematics, and Direct Measurement of Black Hole Masses