The XXL Survey. XLII. The LX − σv relation of galaxy groups and clusters 
detected in the XXL and GAMA surveys

Giles, P. A.; Robotham, A.; Ramos-Ceja, M. E.; Maughan, B. J.; Sereno, M.; McGee, S.; Phillipps, S.; Iovino, A.; Turner, D. J.; Adami, C.; Brough, S.; Chiappetti, L.; Driver, S. P.; Evrard, A. E.; Farahi, A.; Gastaldello, F.; Holwerda, B. W.; Hopkins, A. M.; Koulouridis, E.; Pacaud, F.; Pierre, M.; Pimbblet, K. A.

doi:10.1093/mnras/stab3626

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

The XXL Survey. XLII. The L_X − σ_v relation of galaxy groups and clusters detected in the XXL and GAMA surveys

MPS-Authors

/persons/resource/persons247131

Ramos-Ceja, M. E.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Giles, P. A., Robotham, A., Ramos-Ceja, M. E., Maughan, B. J., Sereno, M., McGee, S., et al. (2022). The XXL Survey. XLII. The L_X − σ_v relation of galaxy groups and clusters detected in the XXL and GAMA surveys. Monthly Notices of the Royal Astronomical Society, 511(1), 1227-1246. doi:10.1093/mnras/stab3626.

Cite as: https://hdl.handle.net/21.11116/0000-000A-AD86-C

Abstract

The XXL Survey is the largest homogeneous survey carried out with XMM-Newton. Covering an area of 50deg², the survey contains several hundred galaxy clusters out to a redshift of ≈2, above an X-ray flux limit of ∼6 × 10⁻¹⁵ er g cm⁻² s⁻¹. The GAMA spectroscopic survey of ∼300 000 galaxies covers ≈286 deg², down to an r-band magnitude of r < 19.8 mag. The region of overlap of these two surveys (covering 14.6 deg²) represents an ideal opportunity to study clusters selected via two independent selection criteria. Generating two independently selected samples of clusters, one drawn from XXL (spanning a redshift range 0.05 ≤ z ≤ 0.3) and another from GAMA (0.05 ≤ z ≤ 0.2), both spanning 0.2 ≲ M₅₀₀ ≲ 5 × 10¹⁴ M_⊙, we investigate the relationship between X-ray luminosity and velocity dispersion (L_X − σ_v relation). Comparing the L_X − σ_v relation between the X-ray selected and optically selected samples, when not accounting for the X-ray selection, we find that the scatter of the X-ray selected sample is 2.7 times higher than the optically selected sample (at the 3.7σ level). Accounting for the X-ray selection to model the L_X − σ_v relation, we find that the difference in the scatter increases (with the X-ray selected sample having a scatter 3.4 times larger than the optically selected sample). Although the scatter of the optically selected sample is lower, we find 13 optically selected GAMA groups undetected in X-rays. Inspection of the difference in magnitude between the first and second brightest galaxies in the cluster, and a stacked X-ray image of these 13 groups, suggests that these are young systems still in the process of forming.