Planck view of the M 82 galaxy

¹ SIA, Sapienza University of Rome, 00185 Rome, Italy
² Center for Cosmology and Astrophysics, Alikhanian National Laboratory and and Yerevan State University, Yerevan, Armenia
³ Dipartimento di Matematica e Fisica “E. De Giorgi”, Università del Salento, via per Arnesano, 73100 Lecce, Italy
⁴ INFN, Sez. di Lecce, via per Arnesano, 73100 Lecce, Italy
e-mail: DePaolis@le.infn.it
⁵ Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
⁶ School of Natural Sciences, National University of Sciences and Technology, H-12, Islamabad, Pakistan
⁷ Department of Physics, University of Trento, 38123, Povo Trento, Italy
⁸ TIFPA/INFN, 38123 Povo, Italy

Received: 6 August 2015
Accepted: 24 August 2015

Abstract

Planck data towards the galaxy M 82 are analyzed in the 70, 100 and 143 GHz bands. A substantial north-south and east-west temperature asymmetry is found, extending up to 1° from the galactic center. Being almost frequency-independent, these temperature asymmetries are indicative of a Doppler-induced effect regarding the line-of-sight dynamics on the halo scale, the ejections from the galactic center and, possibly, even the tidal interaction with M 81 galaxy. The temperature asymmetry thus acts as a model-independent tool to reveal the bulk dynamics in nearby edge-on spiral galaxies, like the Sunyaev-Zeldovich effect for clusters of galaxies.