Substructure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters

R. Adam; O. Hahn; F. Ruppin; P. Ade; P. André; M. Arnaud; I. Bartalucci; A. Beelen; A. Benoît; A. Bideaud; N. Billot; O. Bourrion; M. Calvo; A. Catalano; G. Coiffard; B. Comis; A. D'Addabbo; F. X. Désert; S. Doyle; C. Ferrari; J. Goupy; C. Kramer; G. Lagache; S. Leclercq; J. F. Lestrade; J. F. MacÍas-Pérez; G. Martinez Aviles; D. Martizzi; S. Maurogordato; Philip Mauskopf; F. Mayet; A. Monfardini; F. Pajot; E. Pascale; L. Perotto; G. Pisano; E. Pointecouteau; N. Ponthieu; G. W. Pratt; V. Revéret; M. Ricci; A. Ritacco; L. Rodriguez; C. Romero; H. Roussel; K. Schuster; A. Sievers; S. Triqueneaux; C. Tucker; H. Y. Wu; R. Zylka

doi:10.1051/0004-6361/201731950

Substructure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters

R. Adam, O. Hahn, F. Ruppin, P. Ade, P. André, M. Arnaud, I. Bartalucci, A. Beelen, A. Benoît, A. Bideaud, N. Billot, O. Bourrion, M. Calvo, A. Catalano, G. Coiffard, B. Comis, A. D'Addabbo, F. X. Désert, S. Doyle, C. FerrariJ. Goupy, C. Kramer, G. Lagache, S. Leclercq, J. F. Lestrade, J. F. MacÍas-Pérez, G. Martinez Aviles, D. Martizzi, S. Maurogordato, Philip Mauskopf, F. Mayet, A. Monfardini, F. Pajot, E. Pascale, L. Perotto, G. Pisano, E. Pointecouteau, N. Ponthieu, G. W. Pratt, V. Revéret, M. Ricci, A. Ritacco, L. Rodriguez, C. Romero, H. Roussel, K. Schuster, A. Sievers, S. Triqueneaux, C. Tucker, H. Y. Wu, R. Zylka

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

Substructures in the hot gas atmosphere of galaxy clusters are related to their formation history and to the astrophysical processes at play in the intracluster medium (ICM). The thermal Sunyaev-Zel'dovich (tSZ) effect is directly sensitive to the line-of-sight integrated ICM pressure, and is thus particularly adapted to study ICM substructures. In this paper, we apply structure-enhancement filtering algorithms to high-resolution tSZ observations (e.g., NIKA) of distant clusters in order to search for pressure discontinuities, compressions, and secondary peaks in the ICM. The same filters are applied to toy-model images and to synthetic tSZ images extracted from RHAPSODY-G cosmological hydrodynamic simulations, in order to better interpret the extracted features. We also study the noise propagation through the filters and quantify the impact of systematic effects, such as data-processing-induced artifacts and point-source residuals, the latter being identified as the dominant potential contaminant. In three of our six NIKA-observed clusters we identify features at high signal-to-noise ratio that show clear evidence for merger events. In MACS J0717.5+3745 (z = 0.55), three strong pressure gradients are observed on the east, southeast, and west sectors, and two main peaks in the pressure distribution are identified. We observe a lack of tSZ compact structure in the cool-core cluster PSZ1 G045.85+57.71 (z = 0.61), and a tSZ gradient ridge dominates in the southeast. In the highest redshift cluster, CL J1226.9+3332 (z = 0.89), we detect a ridge pressure gradient of ~45 arcsec (360 kpc) in length associated with a secondary pressure peak in the west region. Our results show that current tSZ facilities have now reached the angular resolution and sensitivity to allow an exploration of the details of pressure substructures in clusters, even at high redshift. This opens the possibility to quantify the impact of the dynamical state on the relation between the tSZ signal and the mass of clusters, which is important when using tSZ clusters to test cosmological models. This work also marks the first NIKA cluster sample data release.

Original language	English (US)
Article number	A118
Journal	Astronomy and Astrophysics
Volume	614
DOIs	https://doi.org/10.1051/0004-6361/201731950
State	Published - Jun 1 2018

Keywords

Galaxies: clusters: intracluster medium
Large-scale structure of Universe
Techniques: high angular resolution
Techniques: image processing

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1051/0004-6361/201731950

Cite this

Adam, R., Hahn, O., Ruppin, F., Ade, P., André, P., Arnaud, M., Bartalucci, I., Beelen, A., Benoît, A., Bideaud, A., Billot, N., Bourrion, O., Calvo, M., Catalano, A., Coiffard, G., Comis, B., D'Addabbo, A., Désert, F. X., Doyle, S., ... Zylka, R. (2018). Substructure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters. Astronomy and Astrophysics, 614, Article A118. https://doi.org/10.1051/0004-6361/201731950

Adam, R, Hahn, O, Ruppin, F, Ade, P, André, P, Arnaud, M, Bartalucci, I, Beelen, A, Benoît, A, Bideaud, A, Billot, N, Bourrion, O, Calvo, M, Catalano, A, Coiffard, G, Comis, B, D'Addabbo, A, Désert, FX, Doyle, S, Ferrari, C, Goupy, J, Kramer, C, Lagache, G, Leclercq, S, Lestrade, JF, MacÍas-Pérez, JF, Martinez Aviles, G, Martizzi, D, Maurogordato, S, Mauskopf, P, Mayet, F, Monfardini, A, Pajot, F, Pascale, E, Perotto, L, Pisano, G, Pointecouteau, E, Ponthieu, N, Pratt, GW, Revéret, V, Ricci, M, Ritacco, A, Rodriguez, L, Romero, C, Roussel, H, Schuster, K, Sievers, A, Triqueneaux, S, Tucker, C, Wu, HY & Zylka, R 2018, 'Substructure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters', Astronomy and Astrophysics, vol. 614, A118. https://doi.org/10.1051/0004-6361/201731950

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title = "Substructure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters",

abstract = "Substructures in the hot gas atmosphere of galaxy clusters are related to their formation history and to the astrophysical processes at play in the intracluster medium (ICM). The thermal Sunyaev-Zel'dovich (tSZ) effect is directly sensitive to the line-of-sight integrated ICM pressure, and is thus particularly adapted to study ICM substructures. In this paper, we apply structure-enhancement filtering algorithms to high-resolution tSZ observations (e.g., NIKA) of distant clusters in order to search for pressure discontinuities, compressions, and secondary peaks in the ICM. The same filters are applied to toy-model images and to synthetic tSZ images extracted from RHAPSODY-G cosmological hydrodynamic simulations, in order to better interpret the extracted features. We also study the noise propagation through the filters and quantify the impact of systematic effects, such as data-processing-induced artifacts and point-source residuals, the latter being identified as the dominant potential contaminant. In three of our six NIKA-observed clusters we identify features at high signal-to-noise ratio that show clear evidence for merger events. In MACS J0717.5+3745 (z = 0.55), three strong pressure gradients are observed on the east, southeast, and west sectors, and two main peaks in the pressure distribution are identified. We observe a lack of tSZ compact structure in the cool-core cluster PSZ1 G045.85+57.71 (z = 0.61), and a tSZ gradient ridge dominates in the southeast. In the highest redshift cluster, CL J1226.9+3332 (z = 0.89), we detect a ridge pressure gradient of ~45 arcsec (360 kpc) in length associated with a secondary pressure peak in the west region. Our results show that current tSZ facilities have now reached the angular resolution and sensitivity to allow an exploration of the details of pressure substructures in clusters, even at high redshift. This opens the possibility to quantify the impact of the dynamical state on the relation between the tSZ signal and the mass of clusters, which is important when using tSZ clusters to test cosmological models. This work also marks the first NIKA cluster sample data release.",

keywords = "Galaxies: clusters: intracluster medium, Large-scale structure of Universe, Techniques: high angular resolution, Techniques: image processing",

author = "R. Adam and O. Hahn and F. Ruppin and P. Ade and P. Andr{\'e} and M. Arnaud and I. Bartalucci and A. Beelen and A. Beno{\^i}t and A. Bideaud and N. Billot and O. Bourrion and M. Calvo and A. Catalano and G. Coiffard and B. Comis and A. D'Addabbo and D{\'e}sert, {F. X.} and S. Doyle and C. Ferrari and J. Goupy and C. Kramer and G. Lagache and S. Leclercq and Lestrade, {J. F.} and Mac{\'I}as-P{\'e}rez, {J. F.} and {Martinez Aviles}, G. and D. Martizzi and S. Maurogordato and Philip Mauskopf and F. Mayet and A. Monfardini and F. Pajot and E. Pascale and L. Perotto and G. Pisano and E. Pointecouteau and N. Ponthieu and Pratt, {G. W.} and V. Rev{\'e}ret and M. Ricci and A. Ritacco and L. Rodriguez and C. Romero and H. Roussel and K. Schuster and A. Sievers and S. Triqueneaux and C. Tucker and Wu, {H. Y.} and R. Zylka",

note = "Publisher Copyright: {\textcopyright} 2018 ESO.",

year = "2018",

month = jun,

day = "1",

doi = "10.1051/0004-6361/201731950",

language = "English (US)",

volume = "614",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

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TY - JOUR

T1 - Substructure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters

AU - Adam, R.

AU - Hahn, O.

AU - Ruppin, F.

AU - Ade, P.

AU - André, P.

AU - Arnaud, M.

AU - Bartalucci, I.

AU - Beelen, A.

AU - Benoît, A.

AU - Bideaud, A.

AU - Billot, N.

AU - Bourrion, O.

AU - Calvo, M.

AU - Catalano, A.

AU - Coiffard, G.

AU - Comis, B.

AU - D'Addabbo, A.

AU - Désert, F. X.

AU - Doyle, S.

AU - Ferrari, C.

AU - Goupy, J.

AU - Kramer, C.

AU - Lagache, G.

AU - Leclercq, S.

AU - Lestrade, J. F.

AU - MacÍas-Pérez, J. F.

AU - Martinez Aviles, G.

AU - Martizzi, D.

AU - Maurogordato, S.

AU - Mauskopf, Philip

AU - Mayet, F.

AU - Monfardini, A.

AU - Pajot, F.

AU - Pascale, E.

AU - Perotto, L.

AU - Pisano, G.

AU - Pointecouteau, E.

AU - Ponthieu, N.

AU - Pratt, G. W.

AU - Revéret, V.

AU - Ricci, M.

AU - Ritacco, A.

AU - Rodriguez, L.

AU - Romero, C.

AU - Roussel, H.

AU - Schuster, K.

AU - Sievers, A.

AU - Triqueneaux, S.

AU - Tucker, C.

AU - Wu, H. Y.

AU - Zylka, R.

PY - 2018/6/1

Y1 - 2018/6/1

N2 - Substructures in the hot gas atmosphere of galaxy clusters are related to their formation history and to the astrophysical processes at play in the intracluster medium (ICM). The thermal Sunyaev-Zel'dovich (tSZ) effect is directly sensitive to the line-of-sight integrated ICM pressure, and is thus particularly adapted to study ICM substructures. In this paper, we apply structure-enhancement filtering algorithms to high-resolution tSZ observations (e.g., NIKA) of distant clusters in order to search for pressure discontinuities, compressions, and secondary peaks in the ICM. The same filters are applied to toy-model images and to synthetic tSZ images extracted from RHAPSODY-G cosmological hydrodynamic simulations, in order to better interpret the extracted features. We also study the noise propagation through the filters and quantify the impact of systematic effects, such as data-processing-induced artifacts and point-source residuals, the latter being identified as the dominant potential contaminant. In three of our six NIKA-observed clusters we identify features at high signal-to-noise ratio that show clear evidence for merger events. In MACS J0717.5+3745 (z = 0.55), three strong pressure gradients are observed on the east, southeast, and west sectors, and two main peaks in the pressure distribution are identified. We observe a lack of tSZ compact structure in the cool-core cluster PSZ1 G045.85+57.71 (z = 0.61), and a tSZ gradient ridge dominates in the southeast. In the highest redshift cluster, CL J1226.9+3332 (z = 0.89), we detect a ridge pressure gradient of ~45 arcsec (360 kpc) in length associated with a secondary pressure peak in the west region. Our results show that current tSZ facilities have now reached the angular resolution and sensitivity to allow an exploration of the details of pressure substructures in clusters, even at high redshift. This opens the possibility to quantify the impact of the dynamical state on the relation between the tSZ signal and the mass of clusters, which is important when using tSZ clusters to test cosmological models. This work also marks the first NIKA cluster sample data release.

AB - Substructures in the hot gas atmosphere of galaxy clusters are related to their formation history and to the astrophysical processes at play in the intracluster medium (ICM). The thermal Sunyaev-Zel'dovich (tSZ) effect is directly sensitive to the line-of-sight integrated ICM pressure, and is thus particularly adapted to study ICM substructures. In this paper, we apply structure-enhancement filtering algorithms to high-resolution tSZ observations (e.g., NIKA) of distant clusters in order to search for pressure discontinuities, compressions, and secondary peaks in the ICM. The same filters are applied to toy-model images and to synthetic tSZ images extracted from RHAPSODY-G cosmological hydrodynamic simulations, in order to better interpret the extracted features. We also study the noise propagation through the filters and quantify the impact of systematic effects, such as data-processing-induced artifacts and point-source residuals, the latter being identified as the dominant potential contaminant. In three of our six NIKA-observed clusters we identify features at high signal-to-noise ratio that show clear evidence for merger events. In MACS J0717.5+3745 (z = 0.55), three strong pressure gradients are observed on the east, southeast, and west sectors, and two main peaks in the pressure distribution are identified. We observe a lack of tSZ compact structure in the cool-core cluster PSZ1 G045.85+57.71 (z = 0.61), and a tSZ gradient ridge dominates in the southeast. In the highest redshift cluster, CL J1226.9+3332 (z = 0.89), we detect a ridge pressure gradient of ~45 arcsec (360 kpc) in length associated with a secondary pressure peak in the west region. Our results show that current tSZ facilities have now reached the angular resolution and sensitivity to allow an exploration of the details of pressure substructures in clusters, even at high redshift. This opens the possibility to quantify the impact of the dynamical state on the relation between the tSZ signal and the mass of clusters, which is important when using tSZ clusters to test cosmological models. This work also marks the first NIKA cluster sample data release.

KW - Galaxies: clusters: intracluster medium

KW - Large-scale structure of Universe

KW - Techniques: high angular resolution

KW - Techniques: image processing

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U2 - 10.1051/0004-6361/201731950

DO - 10.1051/0004-6361/201731950

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JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A118

ER -

Substructure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters

Abstract

Keywords

ASJC Scopus subject areas

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Substructure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

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Fingerprint

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NIKA Sunyaev-Zel'dovich data release

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