Planck intermediate results

X. Physics of the hot gas in the Coma cluster

P. A.R. Ade, N. Aghanim, M. Arnaud, M. Ashdown, F. Atrio-Barandela, J. Aumont, C. Baccigalupi, A. Balbi, A. J. Banday, R. B. Barreiro, J. G. Bartlett, E. Battaner, K. Benabed, A. Benoît, J. P. Bernard, M. Bersanelli, I. Bikmaev, H. Böhringer, A. Bonaldi, J. R. Bond & 30 others J. Borrill, F. R. Bouchet, H. Bourdin, M. L. Brown, S. D. Brown, R. Burenin, C. Burigana, P. Cabella, J. F. Cardoso, P. Carvalho, A. Catalano, L. Cayón, L. Y. Chiang, G. Chon, P. R. Christensen, E. Churazov, D. L. Clements, S. Colafrancesco, L. P.L. Colombo, A. Coulais, B. P. Crill, F. Cuttaia, A. Da Silva, H. Dahle, L. Danese, R. J. Davis, P. De Bernardis, G. De Gasperis, A. De Rosa, J. Varis

Research output: Contribution to journalArticleScientificpeer-review

26 Citations (Scopus)

Abstract

We present an analysis of Planck satellite data on the Coma cluster observed via the Sunyaev-Zeldovich effect. Thanks to its great sensitivity, Planck is able, for the first time, to detect SZ emission up to r ≈ 3 × R500. We test previously proposed spherically symmetric models for the pressure distribution in clusters against the azimuthally averaged data. In particular, we find that the Arnaud et al. (2010, A&A, 517, A92) "universal" pressure profile does not fit Coma, and that their pressure profile for merging systems provides a reasonable fit to the data only at r < R500; by r = 2 × R500 it underestimates the observed y profile by a factor of â‰2. This may indicate that at these larger radii either: i) the cluster SZ emission is contaminated by unresolved SZ sources along the line of sight; or ii) the pressure profile of Coma is higher at r > R500 than the mean pressure profile predicted by the simulations used to constrain the models. The Planck image shows significant local steepening of the y profile in two regions about half a degree to the west and to the south-east of the cluster centre. These features are consistent with the presence of shock fronts at these radii, and indeed the western feature was previously noticed in the ROSAT PSPC mosaic as well as in the radio. Using Plancky profiles extracted from corresponding sectors we find pressure jumps of 4.9-0.2 +0.4 and 5.0-0.1 +1.3 in the west and south-east, respectively. Assuming Rankine-Hugoniot pressure jump conditions, we deduce that the shock waves should propagate with Mach number Mw = 2.03-0.04 +0.09 and Mse = 2.05-0.02 +0.25 in the west and south-east, respectively. Finally, we find that the y and radio-synchrotron signals are quasi-linearly correlated on Mpc scales, with small intrinsic scatter. This implies either that the energy density of cosmic-ray electrons is relatively constant throughout the cluster, or that the magnetic fields fall off much more slowly with radius than previously thought.

Original languageEnglish
Article numberA140
Number of pages19
JournalAstronomy and Astrophysics
Volume554
DOIs
Publication statusPublished - 26 Jun 2013
MoE publication typeNot Eligible

Fingerprint

coma
high temperature gases
physics
profiles
gas
Sunyaev-Zeldovich effect
radii
radio
shock fronts
pressure distribution
Mach number
shock waves
cosmic rays
shock wave
synchrotrons
sectors
flux density
cosmic ray
satellite data
magnetic field

Keywords

  • Cosmic background radiation
  • Cosmology: observations
  • Galaxies: clusters: general
  • Galaxies: clusters: individual: Coma cluster
  • Galaxies: clusters: intracluster medium
  • X-rays: galaxies: clusters

Cite this

Ade, P. A. R., Aghanim, N., Arnaud, M., Ashdown, M., Atrio-Barandela, F., Aumont, J., ... Varis, J. (2013). Planck intermediate results: X. Physics of the hot gas in the Coma cluster. Astronomy and Astrophysics, 554, [A140]. https://doi.org/10.1051/0004-6361/201220247
Ade, P. A.R. ; Aghanim, N. ; Arnaud, M. ; Ashdown, M. ; Atrio-Barandela, F. ; Aumont, J. ; Baccigalupi, C. ; Balbi, A. ; Banday, A. J. ; Barreiro, R. B. ; Bartlett, J. G. ; Battaner, E. ; Benabed, K. ; Benoît, A. ; Bernard, J. P. ; Bersanelli, M. ; Bikmaev, I. ; Böhringer, H. ; Bonaldi, A. ; Bond, J. R. ; Borrill, J. ; Bouchet, F. R. ; Bourdin, H. ; Brown, M. L. ; Brown, S. D. ; Burenin, R. ; Burigana, C. ; Cabella, P. ; Cardoso, J. F. ; Carvalho, P. ; Catalano, A. ; Cayón, L. ; Chiang, L. Y. ; Chon, G. ; Christensen, P. R. ; Churazov, E. ; Clements, D. L. ; Colafrancesco, S. ; Colombo, L. P.L. ; Coulais, A. ; Crill, B. P. ; Cuttaia, F. ; Da Silva, A. ; Dahle, H. ; Danese, L. ; Davis, R. J. ; De Bernardis, P. ; De Gasperis, G. ; De Rosa, A. ; Varis, J. / Planck intermediate results : X. Physics of the hot gas in the Coma cluster. In: Astronomy and Astrophysics. 2013 ; Vol. 554.
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abstract = "We present an analysis of Planck satellite data on the Coma cluster observed via the Sunyaev-Zeldovich effect. Thanks to its great sensitivity, Planck is able, for the first time, to detect SZ emission up to r ≈ 3 × R500. We test previously proposed spherically symmetric models for the pressure distribution in clusters against the azimuthally averaged data. In particular, we find that the Arnaud et al. (2010, A&A, 517, A92) {"}universal{"} pressure profile does not fit Coma, and that their pressure profile for merging systems provides a reasonable fit to the data only at r < R500; by r = 2 × R500 it underestimates the observed y profile by a factor of {\^a}‰2. This may indicate that at these larger radii either: i) the cluster SZ emission is contaminated by unresolved SZ sources along the line of sight; or ii) the pressure profile of Coma is higher at r > R500 than the mean pressure profile predicted by the simulations used to constrain the models. The Planck image shows significant local steepening of the y profile in two regions about half a degree to the west and to the south-east of the cluster centre. These features are consistent with the presence of shock fronts at these radii, and indeed the western feature was previously noticed in the ROSAT PSPC mosaic as well as in the radio. Using Plancky profiles extracted from corresponding sectors we find pressure jumps of 4.9-0.2 +0.4 and 5.0-0.1 +1.3 in the west and south-east, respectively. Assuming Rankine-Hugoniot pressure jump conditions, we deduce that the shock waves should propagate with Mach number Mw = 2.03-0.04 +0.09 and Mse = 2.05-0.02 +0.25 in the west and south-east, respectively. Finally, we find that the y and radio-synchrotron signals are quasi-linearly correlated on Mpc scales, with small intrinsic scatter. This implies either that the energy density of cosmic-ray electrons is relatively constant throughout the cluster, or that the magnetic fields fall off much more slowly with radius than previously thought.",
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Ade, PAR, Aghanim, N, Arnaud, M, Ashdown, M, Atrio-Barandela, F, Aumont, J, Baccigalupi, C, Balbi, A, Banday, AJ, Barreiro, RB, Bartlett, JG, Battaner, E, Benabed, K, Benoît, A, Bernard, JP, Bersanelli, M, Bikmaev, I, Böhringer, H, Bonaldi, A, Bond, JR, Borrill, J, Bouchet, FR, Bourdin, H, Brown, ML, Brown, SD, Burenin, R, Burigana, C, Cabella, P, Cardoso, JF, Carvalho, P, Catalano, A, Cayón, L, Chiang, LY, Chon, G, Christensen, PR, Churazov, E, Clements, DL, Colafrancesco, S, Colombo, LPL, Coulais, A, Crill, BP, Cuttaia, F, Da Silva, A, Dahle, H, Danese, L, Davis, RJ, De Bernardis, P, De Gasperis, G, De Rosa, A & Varis, J 2013, 'Planck intermediate results: X. Physics of the hot gas in the Coma cluster', Astronomy and Astrophysics, vol. 554, A140. https://doi.org/10.1051/0004-6361/201220247

Planck intermediate results : X. Physics of the hot gas in the Coma cluster. / Ade, P. A.R.; Aghanim, N.; Arnaud, M.; Ashdown, M.; Atrio-Barandela, F.; Aumont, J.; Baccigalupi, C.; Balbi, A.; Banday, A. J.; Barreiro, R. B.; Bartlett, J. G.; Battaner, E.; Benabed, K.; Benoît, A.; Bernard, J. P.; Bersanelli, M.; Bikmaev, I.; Böhringer, H.; Bonaldi, A.; Bond, J. R.; Borrill, J.; Bouchet, F. R.; Bourdin, H.; Brown, M. L.; Brown, S. D.; Burenin, R.; Burigana, C.; Cabella, P.; Cardoso, J. F.; Carvalho, P.; Catalano, A.; Cayón, L.; Chiang, L. Y.; Chon, G.; Christensen, P. R.; Churazov, E.; Clements, D. L.; Colafrancesco, S.; Colombo, L. P.L.; Coulais, A.; Crill, B. P.; Cuttaia, F.; Da Silva, A.; Dahle, H.; Danese, L.; Davis, R. J.; De Bernardis, P.; De Gasperis, G.; De Rosa, A.; Varis, J.

In: Astronomy and Astrophysics, Vol. 554, A140, 26.06.2013.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Planck intermediate results

T2 - X. Physics of the hot gas in the Coma cluster

AU - Ade, P. A.R.

AU - Aghanim, N.

AU - Arnaud, M.

AU - Ashdown, M.

AU - Atrio-Barandela, F.

AU - Aumont, J.

AU - Baccigalupi, C.

AU - Balbi, A.

AU - Banday, A. J.

AU - Barreiro, R. B.

AU - Bartlett, J. G.

AU - Battaner, E.

AU - Benabed, K.

AU - Benoît, A.

AU - Bernard, J. P.

AU - Bersanelli, M.

AU - Bikmaev, I.

AU - Böhringer, H.

AU - Bonaldi, A.

AU - Bond, J. R.

AU - Borrill, J.

AU - Bouchet, F. R.

AU - Bourdin, H.

AU - Brown, M. L.

AU - Brown, S. D.

AU - Burenin, R.

AU - Burigana, C.

AU - Cabella, P.

AU - Cardoso, J. F.

AU - Carvalho, P.

AU - Catalano, A.

AU - Cayón, L.

AU - Chiang, L. Y.

AU - Chon, G.

AU - Christensen, P. R.

AU - Churazov, E.

AU - Clements, D. L.

AU - Colafrancesco, S.

AU - Colombo, L. P.L.

AU - Coulais, A.

AU - Crill, B. P.

AU - Cuttaia, F.

AU - Da Silva, A.

AU - Dahle, H.

AU - Danese, L.

AU - Davis, R. J.

AU - De Bernardis, P.

AU - De Gasperis, G.

AU - De Rosa, A.

AU - Varis, J.

PY - 2013/6/26

Y1 - 2013/6/26

N2 - We present an analysis of Planck satellite data on the Coma cluster observed via the Sunyaev-Zeldovich effect. Thanks to its great sensitivity, Planck is able, for the first time, to detect SZ emission up to r ≈ 3 × R500. We test previously proposed spherically symmetric models for the pressure distribution in clusters against the azimuthally averaged data. In particular, we find that the Arnaud et al. (2010, A&A, 517, A92) "universal" pressure profile does not fit Coma, and that their pressure profile for merging systems provides a reasonable fit to the data only at r < R500; by r = 2 × R500 it underestimates the observed y profile by a factor of â‰2. This may indicate that at these larger radii either: i) the cluster SZ emission is contaminated by unresolved SZ sources along the line of sight; or ii) the pressure profile of Coma is higher at r > R500 than the mean pressure profile predicted by the simulations used to constrain the models. The Planck image shows significant local steepening of the y profile in two regions about half a degree to the west and to the south-east of the cluster centre. These features are consistent with the presence of shock fronts at these radii, and indeed the western feature was previously noticed in the ROSAT PSPC mosaic as well as in the radio. Using Plancky profiles extracted from corresponding sectors we find pressure jumps of 4.9-0.2 +0.4 and 5.0-0.1 +1.3 in the west and south-east, respectively. Assuming Rankine-Hugoniot pressure jump conditions, we deduce that the shock waves should propagate with Mach number Mw = 2.03-0.04 +0.09 and Mse = 2.05-0.02 +0.25 in the west and south-east, respectively. Finally, we find that the y and radio-synchrotron signals are quasi-linearly correlated on Mpc scales, with small intrinsic scatter. This implies either that the energy density of cosmic-ray electrons is relatively constant throughout the cluster, or that the magnetic fields fall off much more slowly with radius than previously thought.

AB - We present an analysis of Planck satellite data on the Coma cluster observed via the Sunyaev-Zeldovich effect. Thanks to its great sensitivity, Planck is able, for the first time, to detect SZ emission up to r ≈ 3 × R500. We test previously proposed spherically symmetric models for the pressure distribution in clusters against the azimuthally averaged data. In particular, we find that the Arnaud et al. (2010, A&A, 517, A92) "universal" pressure profile does not fit Coma, and that their pressure profile for merging systems provides a reasonable fit to the data only at r < R500; by r = 2 × R500 it underestimates the observed y profile by a factor of â‰2. This may indicate that at these larger radii either: i) the cluster SZ emission is contaminated by unresolved SZ sources along the line of sight; or ii) the pressure profile of Coma is higher at r > R500 than the mean pressure profile predicted by the simulations used to constrain the models. The Planck image shows significant local steepening of the y profile in two regions about half a degree to the west and to the south-east of the cluster centre. These features are consistent with the presence of shock fronts at these radii, and indeed the western feature was previously noticed in the ROSAT PSPC mosaic as well as in the radio. Using Plancky profiles extracted from corresponding sectors we find pressure jumps of 4.9-0.2 +0.4 and 5.0-0.1 +1.3 in the west and south-east, respectively. Assuming Rankine-Hugoniot pressure jump conditions, we deduce that the shock waves should propagate with Mach number Mw = 2.03-0.04 +0.09 and Mse = 2.05-0.02 +0.25 in the west and south-east, respectively. Finally, we find that the y and radio-synchrotron signals are quasi-linearly correlated on Mpc scales, with small intrinsic scatter. This implies either that the energy density of cosmic-ray electrons is relatively constant throughout the cluster, or that the magnetic fields fall off much more slowly with radius than previously thought.

KW - Cosmic background radiation

KW - Cosmology: observations

KW - Galaxies: clusters: general

KW - Galaxies: clusters: individual: Coma cluster

KW - Galaxies: clusters: intracluster medium

KW - X-rays: galaxies: clusters

UR - http://www.scopus.com/inward/record.url?scp=84879209116&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201220247

DO - 10.1051/0004-6361/201220247

M3 - Article

VL - 554

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A140

ER -

Ade PAR, Aghanim N, Arnaud M, Ashdown M, Atrio-Barandela F, Aumont J et al. Planck intermediate results: X. Physics of the hot gas in the Coma cluster. Astronomy and Astrophysics. 2013 Jun 26;554. A140. https://doi.org/10.1051/0004-6361/201220247