Letter to the Editor

Messier 90 galactic halo rotation in the microwaves

¹ Department of Mathematics and Physics “E. De Giorgi”, University of Salento, Via per Arnesano, CP-I93, I-73100 Lecce, Italy
² INFN, Sezione di Lecce, Via per Arnesano, CP-193, I-73100 Lecce, Italy
³ INAF, Sezione di Lecce, Via per Arnesano, CP-193, I-73100 Lecce, Italy
⁴ Center for Cosmology and Astrophysics, Alikhanian National Laboratory and Yerevan State University, Yerevan, Armenia
⁵ SIA, Sapienza University of Rome, Rome, Italy
⁶ Pakistan Academy of Sciences, Constitution Avenue, G-5, Islamabad, Pakistan
⁷ Department of Physics and Astronomy, School of Natural Sciences (SNS), National University of Sciences and Technology (NUST), Sector H-12, 44000 Islamabad, Pakistan
⁸ Physik Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland

^⋆ Corresponding author; depaolis@le.infn.it

Received: 26 November 2024
Accepted: 9 January 2025

Abstract

We used Planck data to study the Virgo Cluster’s galaxy M 90 and its surroundings. We find, as in the case of certain galaxies of the Local Group and its vicinity, a substantial temperature asymmetry that probably arises from the rotation of the M 90 halo and extends up to about one degree from its centre. This temperature asymmetry is particularly remarkable as M 90 is a rare blueshifted galaxy of the Virgo Cluster, and it thus has possible implications for the cluster internal dynamics versus the galactic halo’s formation and structure. Possible explanations for the observed effect are discussed.