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. BondJ. 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.
    @article{135b8c6aba5f4c32bb74d140e4e81c93,
    title = "Planck intermediate results: X. Physics of the hot gas in the Coma cluster",
    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.",
    keywords = "Cosmic background radiation, Cosmology: observations, Galaxies: clusters: general, Galaxies: clusters: individual: Coma cluster, Galaxies: clusters: intracluster medium, X-rays: galaxies: clusters",
    author = "Ade, {P. A.R.} and N. Aghanim and M. Arnaud and M. Ashdown and F. Atrio-Barandela and J. Aumont and C. Baccigalupi and A. Balbi and Banday, {A. J.} and Barreiro, {R. B.} and Bartlett, {J. G.} and E. Battaner and K. Benabed and A. Beno{\^i}t and Bernard, {J. P.} and M. Bersanelli and I. Bikmaev and H. B{\"o}hringer and A. Bonaldi and Bond, {J. R.} and J. Borrill and Bouchet, {F. R.} and H. Bourdin and Brown, {M. L.} and Brown, {S. D.} and R. Burenin and C. Burigana and P. Cabella and Cardoso, {J. F.} and P. Carvalho and A. Catalano and L. Cay{\'o}n and Chiang, {L. Y.} and G. Chon and Christensen, {P. R.} and E. Churazov and Clements, {D. L.} and S. Colafrancesco and Colombo, {L. P.L.} and A. Coulais and Crill, {B. P.} and F. Cuttaia and {Da Silva}, A. and H. Dahle and L. Danese and Davis, {R. J.} and {De Bernardis}, P. and {De Gasperis}, G. and {De Rosa}, A. and J. Varis",
    year = "2013",
    month = "6",
    day = "26",
    doi = "10.1051/0004-6361/201220247",
    language = "English",
    volume = "554",
    journal = "Astronomy and Astrophysics",
    issn = "0004-6361",
    publisher = "EDP Sciences",

    }

    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

    AN - SCOPUS:84879209116

    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