English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Tempestuous life beyond R500: X-ray view on the Coma cluster with SRG/eROSITA - I. X-ray morphology, recent merger, and radio halo connection

Churazov, E., Khabibullin, I., Lyskova, N., Sunyaev, R., & Bykov, A. M. (2021). Tempestuous life beyond R500: X-ray view on the Coma cluster with SRG/eROSITA - I. X-ray morphology, recent merger, and radio halo connection. Astronomy and Astrophysics, 651: A41. doi:10.1051/0004-6361/202040197.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files
hide Files
:
Tempestuous life beyond R500 X-ray view on the Coma cluster with SRG eROSITA.pdf (Any fulltext), 16MB
 
File Permalink:
-
Name:
Tempestuous life beyond R500 X-ray view on the Coma cluster with SRG eROSITA.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Churazov, E.1, Author              
Khabibullin, I.1, Author              
Lyskova, N.1, Author              
Sunyaev, R.1, Author              
Bykov, A. M., Author
Affiliations:
1High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

Content

show
hide
Free keywords: -
 Abstract: This is the first paper in a series of studies of the Coma cluster using the SRG/eROSITA X-ray data obtained in the course of the calibration and performance verification observations. The data cover a ~3° × 3° area around the cluster with a typical exposure time of more than 20 ks. The stability of the instrumental background and operation of the SRG observatory in the scanning mode provided us with an excellent data set for studies of the diffuse emission up to a distance of ~1.5R200 from the Coma center. In this study, we discuss the rich morphology revealed by the X-ray observations (also in combination with the SZ data) and argue that the most salient features can be naturally explained by a recent (ongoing) merger with the NGC 4839 group. In particular, we identify a faint X-ray bridge connecting the group with the cluster, which is convincing proof that NGC 4839 has already crossed the main cluster. The gas in the Coma core went through two shocks, first through the shock driven by NGC 4839 during its first passage through the cluster some gigayear ago and, more recently, through the “mini-accretion shock” associated with the gas settling back to quasi-hydrostatic equilibrium in the core. After passing through the primary shock, the gas should spend much of the time in a rarefaction region, where radiative losses of electrons are small, until the gas is compressed again by the mini-accretion shock. Unlike “runway” merger shocks, the mini-accretion shock does not feature a rarefaction region downstream and, therefore, the radio emission can survive longer. Such a two-stage process might explain the formation of the radio halo in the Coma cluster.

Details

show
hide
Language(s):
 Dates: 2021-07-09
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202040197
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 651 Sequence Number: A41 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1