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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Diffuse intracluster light (ICL) and cD galaxy halos are believed tooriginate from galaxy evolution and disruption. We present a kinematic study ofthe ICL in the Hydra I cluster core, using planetary nebulas (PNs) as tracers.We used multi-slit imaging spectroscopy with FORS2 on VLT-UT1 to detect 56 PNsassociated with diffuse light in the central 100 x 100 kpc^2 of Hydra I. Wemeasured their [OIII] magnitudes, sky positions, and velocity distribution(LOSVD), and compared with the phase-space distribution of nearby galaxies. Theluminosity function of the detected PNs is consistent with that expected at adistance of ~50 Mpc. Their number density is ~4 times lower for the light seenthan expected, and we discuss ram pressure stripping of the PNs by the hot ICMas one of the possible explanations. The LOSVD histogram of the PNs is highlynon-Gaussian and multipeaked: it is dominated by a broad central component withsigma~500 km/s at around the average velocity of the cluster, and shows twoadditional narrower peaks at 1800 km/s and 5000 km/s. The main component isbroadly consistent with the outward continuation of the intracluster halo ofNGC 3311, which was earlier shown to have a velocity dispersion of ~470 km/s atradii of >50". Galaxies with velocities in this range are absent in the central100 x 100 kpc^2 and may have been disrupted earlier to build this component.The PNs in the second peak in the LOSVD at 5000 km/s are coincident spatiallyand in velocities with a group of dwarf galaxies in the MSIS field. They maytrace the debris from the ongoing tidal disruption of these galaxies. Most ofthe diffuse light in the core of Hydra is still not phase-mixed. The build-upof ICL and the dynamically hot cD halo around NGC 3311 are ongoing, through theaccretion of material from galaxies falling into the cluster core and tidallyinteracting with its potential well.

The unmixed kinematics and origins of diffuse stellar light in the core of the Hydra I cluster (Abell 1060)