The XXL survey XV: Evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters

S. Lavoie; J. P. Willis; J. Démoclès; D. Eckert; F. Gastaldello; G. P. Smith; C. Lidman; C. Adami; F. Pacaud; M. Pierre; N. Clerc; P. Giles; M. Lieu; L. Chiappetti; B. Altieri; F. Ardila; I. Baldry; A. Bongiorno; S. Desai; A. Elyiv; L. Faccioli; B. Gardner; B. Garilli; M. W. Groote; L. Guennou; L. Guzzo; A. M. Hopkins; J. Liske; S. McGee; O. Melnyk; M. S. Owers; B. Poggianti; T. J. Ponman; M. Scodeggio; L. Spitler; R. J. Tuffs

doi:10.1093/mnras/stw1906

The XXL survey XV: Evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters

S. Lavoie, J. P. Willis, J. Démoclès, D. Eckert, F. Gastaldello, G. P. Smith, C. Lidman, C. Adami, F. Pacaud, M. Pierre, N. Clerc, P. Giles, M. Lieu, L. Chiappetti, B. Altieri, F. Ardila, I. Baldry, A. Bongiorno, S. Desai, A. ElyivL. Faccioli, B. Gardner, B. Garilli, M. W. Groote, L. Guennou, L. Guzzo, A. M. Hopkins, J. Liske, S. McGee, O. Melnyk, M. S. Owers, B. Poggianti, T. J. Ponman, M. Scodeggio, L. Spitler, R. J. Tuffs

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Abstract

The growth of brightest cluster galaxies (BCGs) is closely related to the properties of their host cluster. We present evidence for dry mergers as the dominant source of BCG mass growth at z ≲ 1 in the XXL 100 brightest cluster sample. We use the global red sequence, Hα emission and mean star formation history to show that BCGs in the sample possess star formation levels comparable to field ellipticals of similar stellar mass and redshift. XXL 100 brightest clusters are less massive on average than those in other X-ray selected samples such as LoCuSS or HIFLUGCS. Few clusters in the sample display high central gas concentration, rendering inefficient the growth of BCGs via star formation resulting from the accretion of cool gas. Using measures of the relaxation state of their host clusters, we show that BCGs grow as relaxation proceeds. We find that the BCG stellar mass corresponds to a relatively constant fraction 1 per cent of the total cluster mass in relaxed systems. We also show that, following a cluster scale merger event, the BCG stellar mass lags behind the expected value from the M_cluster-M_BCG relation but subsequently accretes stellar mass via dry mergers as the BCG and cluster evolve towards a relaxed state.

Original language	English
Pages (from-to)	4141-4156
Number of pages	16
Journal	Monthly Notices of the Royal Astronomical Society
Volume	462
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stw1906
Publication status	Published - 11 Nov 2016
Externally published	Yes

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Lavoie, S., Willis, J. P., Démoclès, J., Eckert, D., Gastaldello, F., Smith, G. P., Lidman, C., Adami, C., Pacaud, F., Pierre, M., Clerc, N., Giles, P., Lieu, M., Chiappetti, L., Altieri, B., Ardila, F., Baldry, I., Bongiorno, A., Desai, S., ... Tuffs, R. J. (2016). The XXL survey XV: Evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters. Monthly Notices of the Royal Astronomical Society, 462(4), 4141-4156. https://doi.org/10.1093/mnras/stw1906

@article{0f95fe53cdb8416c83f289832998a564,

title = "The XXL survey XV: Evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters",

abstract = "The growth of brightest cluster galaxies (BCGs) is closely related to the properties of their host cluster. We present evidence for dry mergers as the dominant source of BCG mass growth at z ≲ 1 in the XXL 100 brightest cluster sample. We use the global red sequence, Hα emission and mean star formation history to show that BCGs in the sample possess star formation levels comparable to field ellipticals of similar stellar mass and redshift. XXL 100 brightest clusters are less massive on average than those in other X-ray selected samples such as LoCuSS or HIFLUGCS. Few clusters in the sample display high central gas concentration, rendering inefficient the growth of BCGs via star formation resulting from the accretion of cool gas. Using measures of the relaxation state of their host clusters, we show that BCGs grow as relaxation proceeds. We find that the BCG stellar mass corresponds to a relatively constant fraction 1 per cent of the total cluster mass in relaxed systems. We also show that, following a cluster scale merger event, the BCG stellar mass lags behind the expected value from the Mcluster-MBCG relation but subsequently accretes stellar mass via dry mergers as the BCG and cluster evolve towards a relaxed state.",

keywords = "CD, Galaxies: clusters: general, Galaxies: elliptical and lenticular, Galaxies: evolution, Galaxies: interactions, X-rays: galaxies: clusters",

author = "S. Lavoie and Willis, {J. P.} and J. D{\'e}mocl{\`e}s and D. Eckert and F. Gastaldello and Smith, {G. P.} and C. Lidman and C. Adami and F. Pacaud and M. Pierre and N. Clerc and P. Giles and M. Lieu and L. Chiappetti and B. Altieri and F. Ardila and I. Baldry and A. Bongiorno and S. Desai and A. Elyiv and L. Faccioli and B. Gardner and B. Garilli and Groote, {M. W.} and L. Guennou and L. Guzzo and Hopkins, {A. M.} and J. Liske and S. McGee and O. Melnyk and Owers, {M. S.} and B. Poggianti and Ponman, {T. J.} and M. Scodeggio and L. Spitler and Tuffs, {R. J.}",

note = "Publisher Copyright: {\textcopyright} 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.",

year = "2016",

month = nov,

day = "11",

doi = "10.1093/mnras/stw1906",

language = "English",

volume = "462",

pages = "4141--4156",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press ",

number = "4",

}

Lavoie, S, Willis, JP, Démoclès, J, Eckert, D, Gastaldello, F, Smith, GP, Lidman, C, Adami, C, Pacaud, F, Pierre, M, Clerc, N, Giles, P, Lieu, M, Chiappetti, L, Altieri, B, Ardila, F, Baldry, I, Bongiorno, A, Desai, S, Elyiv, A, Faccioli, L, Gardner, B, Garilli, B, Groote, MW, Guennou, L, Guzzo, L, Hopkins, AM, Liske, J, McGee, S, Melnyk, O, Owers, MS, Poggianti, B, Ponman, TJ, Scodeggio, M, Spitler, L & Tuffs, RJ 2016, 'The XXL survey XV: Evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters', Monthly Notices of the Royal Astronomical Society, vol. 462, no. 4, pp. 4141-4156. https://doi.org/10.1093/mnras/stw1906

TY - JOUR

T1 - The XXL survey XV

T2 - Evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters

AU - Lavoie, S.

AU - Willis, J. P.

AU - Démoclès, J.

AU - Eckert, D.

AU - Gastaldello, F.

AU - Smith, G. P.

AU - Lidman, C.

AU - Adami, C.

AU - Pacaud, F.

AU - Pierre, M.

AU - Clerc, N.

AU - Giles, P.

AU - Lieu, M.

AU - Chiappetti, L.

AU - Altieri, B.

AU - Ardila, F.

AU - Baldry, I.

AU - Bongiorno, A.

AU - Desai, S.

AU - Elyiv, A.

AU - Faccioli, L.

AU - Gardner, B.

AU - Garilli, B.

AU - Groote, M. W.

AU - Guennou, L.

AU - Guzzo, L.

AU - Hopkins, A. M.

AU - Liske, J.

AU - McGee, S.

AU - Melnyk, O.

AU - Owers, M. S.

AU - Poggianti, B.

AU - Ponman, T. J.

AU - Scodeggio, M.

AU - Spitler, L.

AU - Tuffs, R. J.

PY - 2016/11/11

Y1 - 2016/11/11

N2 - The growth of brightest cluster galaxies (BCGs) is closely related to the properties of their host cluster. We present evidence for dry mergers as the dominant source of BCG mass growth at z ≲ 1 in the XXL 100 brightest cluster sample. We use the global red sequence, Hα emission and mean star formation history to show that BCGs in the sample possess star formation levels comparable to field ellipticals of similar stellar mass and redshift. XXL 100 brightest clusters are less massive on average than those in other X-ray selected samples such as LoCuSS or HIFLUGCS. Few clusters in the sample display high central gas concentration, rendering inefficient the growth of BCGs via star formation resulting from the accretion of cool gas. Using measures of the relaxation state of their host clusters, we show that BCGs grow as relaxation proceeds. We find that the BCG stellar mass corresponds to a relatively constant fraction 1 per cent of the total cluster mass in relaxed systems. We also show that, following a cluster scale merger event, the BCG stellar mass lags behind the expected value from the Mcluster-MBCG relation but subsequently accretes stellar mass via dry mergers as the BCG and cluster evolve towards a relaxed state.

AB - The growth of brightest cluster galaxies (BCGs) is closely related to the properties of their host cluster. We present evidence for dry mergers as the dominant source of BCG mass growth at z ≲ 1 in the XXL 100 brightest cluster sample. We use the global red sequence, Hα emission and mean star formation history to show that BCGs in the sample possess star formation levels comparable to field ellipticals of similar stellar mass and redshift. XXL 100 brightest clusters are less massive on average than those in other X-ray selected samples such as LoCuSS or HIFLUGCS. Few clusters in the sample display high central gas concentration, rendering inefficient the growth of BCGs via star formation resulting from the accretion of cool gas. Using measures of the relaxation state of their host clusters, we show that BCGs grow as relaxation proceeds. We find that the BCG stellar mass corresponds to a relatively constant fraction 1 per cent of the total cluster mass in relaxed systems. We also show that, following a cluster scale merger event, the BCG stellar mass lags behind the expected value from the Mcluster-MBCG relation but subsequently accretes stellar mass via dry mergers as the BCG and cluster evolve towards a relaxed state.

KW - CD

KW - Galaxies: clusters: general

KW - Galaxies: elliptical and lenticular

KW - Galaxies: evolution

KW - Galaxies: interactions

KW - X-rays: galaxies: clusters

UR - http://www.scopus.com/inward/record.url?scp=84994493201&partnerID=8YFLogxK

U2 - 10.1093/mnras/stw1906

DO - 10.1093/mnras/stw1906

M3 - Article

SN - 0035-8711

VL - 462

SP - 4141

EP - 4156

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

The XXL survey XV: Evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters

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