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The satellite galaxy plane of NGC 4490 in light of {\Lambda}CDM - Sparsity of similarly extreme analogs and a possible role of satellite pairs by Pawlowski, Marcel S.; Müller, Oliver; Taibi, Salvatore; Júlio, Mariana P.; Kanehisa, Kosuke Jamie; Heesters, Nick is a scholarly article available to read on EtoBox.

What is The satellite galaxy plane of NGC 4490 in light of {\Lambda}CDM - Sparsity of similarly extreme analogs and a possible role of satellite pairs about?

The galaxy system around NGC4490 was recently highlighted to display a flattened, kinematically correlated structure reminiscent of satellite galaxy planes around other hosts. Since known satellite planes are in tension with $\Lambda$CDM expectations from cosmological simulations, we quantitatively assess for the first time the tension posed by the NGC4490 system. We measure the on-sky flattening as the major-to-minor axis ratio b/a of the satellite distribution and their line-of-sight kinematic correlation. Analogs are selected in the IllustrisTNG-50 simulation and their flattening and correlation are similarly measured. We confirm the strong kinematic coherence of all 12 observed objects with available line-of-sight velocities (of 14 in total): the northern ones approach and the southern ones recede relative to the host. The spatial distribution of all 14 objects is substantially flattened with b/a=0.38 (0.26 considering only the 12 objects with velocities). Such extreme arrangements are rare in the simulation at 0.21-0.35%. This would drop further if at least one of the two satellite objects without velocities is confirmed to follow the kinematic trend, and would become zero if

Author

Pawlowski, Marcel S.; Müller, Oliver; Taibi, Salvatore; Júlio, Mariana P.; Kanehisa, Kosuke Jamie; Heesters, Nick

Published

2024

Language

EN