Seeing the halo rotation of nearby spiral galaxies using Planck data

  • Noraiz Tahir
  • Francesco De Paolis
  • Asghar Qadir
  • Achille A. NucitaEmail author
Open Access


The rotation of the galactic halos is a fascinating topic which is still waiting to be addressed. Planck data have shown the existence of a temperature asymmetry towards the halo of several nearby galaxies, such as M31, NGC 5128, M33, M81 and M82. However, the cause of this asymmetry is an open problem. A possibility to explain the observed effect relies on the presence of “cold gas clouds” populating the galactic halos, which may be the answer to the so-called missing baryon problem. Here, we present a technique to estimate an upper limit to the rotational velocity of the halo of some nearby spiral galaxies using both their dynamical masses and the Planck data.

Mathematics Subject Classification

85-00 85-02 85-05 



We acknowledge the use of Planck’s data in the Legacy Archive for Microwave Background Data Analysis (LAMBDA) and HEALPix [15] package. We would also like to acknowledge the project Inter-Asia 2018, by the collaboration of National University of Sciences and Technology, Islamabad, Pakistan and University of Salento, Lecce, Italy, and INFN which helped us to interact and work on this project. NT is grateful for the hospitality to the ISUFI college in campus, Eckotecne, of University of Salento, Lecce, Italy. FDP and AAN acknowledge the TAsP and Euclid INFN projects.


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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Noraiz Tahir
    • 1
  • Francesco De Paolis
    • 2
    • 3
  • Asghar Qadir
    • 1
  • Achille A. Nucita
    • 2
    • 3
    Email author
  1. 1.School of Natural SciencesNational University of Sciences and TechnologyIslamabadPakistan
  2. 2.Department of Mathematics and Physics “Ennio De Giorgi”University of SalentoLecceItaly
  3. 3.INFN, Sezione di LecceLecceItaly

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