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/

Zendy Plus

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

Zendy Tools

Zendy Open

We describe the implementation of slitless radial velocity measurements ofextragalactic planetary nebulae (PNs) with the 8.2 m Subaru telescope and itsCassegrain imaging spectrograph, FOCAS. As a first application, we haveextended a previous search for PNs in NGC 4697 to larger angular distances fromits center. A total of 218 PNs were detected, and their radial velocities weremeasured. We have added 56 new PN detections to the existing sample of 535,observed previously with the ESO VLT + FORS imaging spectrograph; 36 of thesenew 56 PNs are located at angular distances larger than 230 arcsec from thecenter of NGC 4697. We compare the new FOCAS velocities with the earlier FORSvelocities, for 158 of the 162 reobserved sources, finding good agreement. Wenow have kinematic information extending out to 5 effective radii from thecenter. The outer line-of-sight velocity dispersion is a bit lower thanestimated earlier. This result is compatible with the existence of a darkmatter halo plus some degree of radial anisotropy, but the dark matter halo israther inconspicuous, and it is still unclear how massive it can be. A moredetailed global dynamical study of the whole set of PN velocities will berequired to decide if they permit to narrow down the range of possible darkmatter distributions in NGC 4697. The new radial velocities reveal no evidenceof rotation at 5 effective radii.

Kinematics of planetary nebulae in the outskirts of the elliptical galaxy NGC 4697