The SCUBA-2 Cosmology Legacy Survey: Ultraluminous Star-forming Galaxies in a z = 1.6 Cluster

Ian Smail; J. E. Geach; A. M. Swinbank; K. Tadaki; V. Arumugam; W. Hartley; O. Almaini; Malcolm N Bremer; E. Chapin; S. C. Chapman; A. L. R. Danielson; A. C. Edge; D. Scott; C. J. Simpson; J. M. Simpson; C. Conselice; J. S. Dunlop; R. J. Ivison; A. Karim; T. Kodama; A. Mortlock; E. I. Robson; I. Roseboom; A. P. Thomson; P. P. van der Werf; T. M. A. Webb

doi:10.1088/0004-637X/782/1/19

The SCUBA-2 Cosmology Legacy Survey: Ultraluminous Star-forming Galaxies in a z = 1.6 Cluster

Ian Smail, J. E. Geach, A. M. Swinbank, K. Tadaki, V. Arumugam, W. Hartley, O. Almaini, Malcolm N Bremer, E. Chapin, S. C. Chapman, A. L. R. Danielson, A. C. Edge, D. Scott, C. J. Simpson, J. M. Simpson, C. Conselice, J. S. Dunlop, R. J. Ivison, A. Karim, T. KodamaA. Mortlock, E. I. Robson, I. Roseboom, A. P. Thomson, P. P. van der Werf, T. M. A. Webb

School of Physics

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Abstract

We analyze new SCUBA-2 submillimeter and archival SPIRE far-infrared imaging of a z = 1.62 cluster, Cl 0218.3-0510, which lies in the UKIRT Infrared Deep Sky Survey/Ultra-Deep Survey field of the SCUBA-2 Cosmology Legacy Survey. Combining these tracers of obscured star-formation activity with the extensive photometric and spectroscopic information available for this field, we identify 31 far-infrared/submillimeter-detected probable cluster members with bolometric luminosities gsim1012 L ⊙ and show that by virtue of their dust content and activity, these represent some of the reddest and brightest galaxies in this structure. We exploit ALMA submillimeter continuum observations, which cover one of these sources, to confirm the identification of a SCUBA-2-detected ultraluminous star-forming galaxy in this structure. Integrating the total star-formation activity in the central region of the structure, we estimate that it is an order of magnitude higher (in a mass-normalized sense) than clusters at z ~ 0.5-1. However, we also find that the most active cluster members do not reside in the densest regions of the structure, which instead host a population of passive and massive, red galaxies. We suggest that while the passive and active populations have comparable near-infrared luminosities at z = 1.6, MH ~ -23, the subsequent stronger fading of the more active galaxies means that they will evolve into passive systems at the present day that are less luminous than the descendants of those galaxies that were already passive at z ~ 1.6 (MH ~ -20.5 and MH ~ -21.5, respectively, at z ~ 0). We conclude that the massive galaxy population in the dense cores of present-day clusters were already in place at z = 1.6 and that in Cl 0218.3-0510 we are seeing continuing infall of less extreme, but still ultraluminous, star-forming galaxies onto a pre-existing structure.

Original language	English
Article number	19
Number of pages	15
Journal	Astrophysical Journal
Volume	782
Issue number	1
Early online date	22 Jan 2014
DOIs	https://doi.org/10.1088/0004-637X/782/1/19
Publication status	Published - 1 Feb 2014

Keywords

cosmology: observations
galaxies: clusters: individual: Cl0218.3–0510
galaxies: evolution
galaxies: formation

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PATT linked grant support for Bristol astrophysics and planetary studies
Birkinshaw, M. (Principal Investigator)
1/10/12 → 1/10/14
Project: Research
Research in planetary physics, astrophysics and cosmology at Bristol
Birkinshaw, M. (Principal Investigator)
1/04/12 → 1/04/15
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Smail, I., Geach, J. E., Swinbank, A. M., Tadaki, K., Arumugam, V., Hartley, W., Almaini, O., Bremer, M. N., Chapin, E., Chapman, S. C., Danielson, A. L. R., Edge, A. C., Scott, D., Simpson, C. J., Simpson, J. M., Conselice, C., Dunlop, J. S., Ivison, R. J., Karim, A., ... Webb, T. M. A. (2014). The SCUBA-2 Cosmology Legacy Survey: Ultraluminous Star-forming Galaxies in a z = 1.6 Cluster. Astrophysical Journal, 782(1), Article 19. https://doi.org/10.1088/0004-637X/782/1/19

@article{c147221f08ef457ba8ae4709f7aa7ade,

title = "The SCUBA-2 Cosmology Legacy Survey: Ultraluminous Star-forming Galaxies in a z = 1.6 Cluster",

abstract = "We analyze new SCUBA-2 submillimeter and archival SPIRE far-infrared imaging of a z = 1.62 cluster, Cl 0218.3-0510, which lies in the UKIRT Infrared Deep Sky Survey/Ultra-Deep Survey field of the SCUBA-2 Cosmology Legacy Survey. Combining these tracers of obscured star-formation activity with the extensive photometric and spectroscopic information available for this field, we identify 31 far-infrared/submillimeter-detected probable cluster members with bolometric luminosities gsim1012 L ⊙ and show that by virtue of their dust content and activity, these represent some of the reddest and brightest galaxies in this structure. We exploit ALMA submillimeter continuum observations, which cover one of these sources, to confirm the identification of a SCUBA-2-detected ultraluminous star-forming galaxy in this structure. Integrating the total star-formation activity in the central region of the structure, we estimate that it is an order of magnitude higher (in a mass-normalized sense) than clusters at z ~ 0.5-1. However, we also find that the most active cluster members do not reside in the densest regions of the structure, which instead host a population of passive and massive, red galaxies. We suggest that while the passive and active populations have comparable near-infrared luminosities at z = 1.6, MH ~ -23, the subsequent stronger fading of the more active galaxies means that they will evolve into passive systems at the present day that are less luminous than the descendants of those galaxies that were already passive at z ~ 1.6 (MH ~ -20.5 and MH ~ -21.5, respectively, at z ~ 0). We conclude that the massive galaxy population in the dense cores of present-day clusters were already in place at z = 1.6 and that in Cl 0218.3-0510 we are seeing continuing infall of less extreme, but still ultraluminous, star-forming galaxies onto a pre-existing structure.",

keywords = "cosmology: observations, galaxies: clusters: individual: Cl0218.3–0510, galaxies: evolution, galaxies: formation",

author = "Ian Smail and Geach, {J. E.} and Swinbank, {A. M.} and K. Tadaki and V. Arumugam and W. Hartley and O. Almaini and Bremer, {Malcolm N} and E. Chapin and Chapman, {S. C.} and Danielson, {A. L. R.} and Edge, {A. C.} and D. Scott and Simpson, {C. J.} and Simpson, {J. M.} and C. Conselice and Dunlop, {J. S.} and Ivison, {R. J.} and A. Karim and T. Kodama and A. Mortlock and Robson, {E. I.} and I. Roseboom and Thomson, {A. P.} and {van der Werf}, {P. P.} and Webb, {T. M. A.}",

year = "2014",

month = feb,

day = "1",

doi = "10.1088/0004-637X/782/1/19",

language = "English",

volume = "782",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Smail, I, Geach, JE, Swinbank, AM, Tadaki, K, Arumugam, V, Hartley, W, Almaini, O, Bremer, MN, Chapin, E, Chapman, SC, Danielson, ALR, Edge, AC, Scott, D, Simpson, CJ, Simpson, JM, Conselice, C, Dunlop, JS, Ivison, RJ, Karim, A, Kodama, T, Mortlock, A, Robson, EI, Roseboom, I, Thomson, AP, van der Werf, PP & Webb, TMA 2014, 'The SCUBA-2 Cosmology Legacy Survey: Ultraluminous Star-forming Galaxies in a z = 1.6 Cluster', Astrophysical Journal, vol. 782, no. 1, 19. https://doi.org/10.1088/0004-637X/782/1/19

TY - JOUR

T1 - The SCUBA-2 Cosmology Legacy Survey: Ultraluminous Star-forming Galaxies in a z = 1.6 Cluster

AU - Smail, Ian

AU - Geach, J. E.

AU - Swinbank, A. M.

AU - Tadaki, K.

AU - Arumugam, V.

AU - Hartley, W.

AU - Almaini, O.

AU - Bremer, Malcolm N

AU - Chapin, E.

AU - Chapman, S. C.

AU - Danielson, A. L. R.

AU - Edge, A. C.

AU - Scott, D.

AU - Simpson, C. J.

AU - Simpson, J. M.

AU - Conselice, C.

AU - Dunlop, J. S.

AU - Ivison, R. J.

AU - Karim, A.

AU - Kodama, T.

AU - Mortlock, A.

AU - Robson, E. I.

AU - Roseboom, I.

AU - Thomson, A. P.

AU - van der Werf, P. P.

AU - Webb, T. M. A.

PY - 2014/2/1

Y1 - 2014/2/1

N2 - We analyze new SCUBA-2 submillimeter and archival SPIRE far-infrared imaging of a z = 1.62 cluster, Cl 0218.3-0510, which lies in the UKIRT Infrared Deep Sky Survey/Ultra-Deep Survey field of the SCUBA-2 Cosmology Legacy Survey. Combining these tracers of obscured star-formation activity with the extensive photometric and spectroscopic information available for this field, we identify 31 far-infrared/submillimeter-detected probable cluster members with bolometric luminosities gsim1012 L ⊙ and show that by virtue of their dust content and activity, these represent some of the reddest and brightest galaxies in this structure. We exploit ALMA submillimeter continuum observations, which cover one of these sources, to confirm the identification of a SCUBA-2-detected ultraluminous star-forming galaxy in this structure. Integrating the total star-formation activity in the central region of the structure, we estimate that it is an order of magnitude higher (in a mass-normalized sense) than clusters at z ~ 0.5-1. However, we also find that the most active cluster members do not reside in the densest regions of the structure, which instead host a population of passive and massive, red galaxies. We suggest that while the passive and active populations have comparable near-infrared luminosities at z = 1.6, MH ~ -23, the subsequent stronger fading of the more active galaxies means that they will evolve into passive systems at the present day that are less luminous than the descendants of those galaxies that were already passive at z ~ 1.6 (MH ~ -20.5 and MH ~ -21.5, respectively, at z ~ 0). We conclude that the massive galaxy population in the dense cores of present-day clusters were already in place at z = 1.6 and that in Cl 0218.3-0510 we are seeing continuing infall of less extreme, but still ultraluminous, star-forming galaxies onto a pre-existing structure.

AB - We analyze new SCUBA-2 submillimeter and archival SPIRE far-infrared imaging of a z = 1.62 cluster, Cl 0218.3-0510, which lies in the UKIRT Infrared Deep Sky Survey/Ultra-Deep Survey field of the SCUBA-2 Cosmology Legacy Survey. Combining these tracers of obscured star-formation activity with the extensive photometric and spectroscopic information available for this field, we identify 31 far-infrared/submillimeter-detected probable cluster members with bolometric luminosities gsim1012 L ⊙ and show that by virtue of their dust content and activity, these represent some of the reddest and brightest galaxies in this structure. We exploit ALMA submillimeter continuum observations, which cover one of these sources, to confirm the identification of a SCUBA-2-detected ultraluminous star-forming galaxy in this structure. Integrating the total star-formation activity in the central region of the structure, we estimate that it is an order of magnitude higher (in a mass-normalized sense) than clusters at z ~ 0.5-1. However, we also find that the most active cluster members do not reside in the densest regions of the structure, which instead host a population of passive and massive, red galaxies. We suggest that while the passive and active populations have comparable near-infrared luminosities at z = 1.6, MH ~ -23, the subsequent stronger fading of the more active galaxies means that they will evolve into passive systems at the present day that are less luminous than the descendants of those galaxies that were already passive at z ~ 1.6 (MH ~ -20.5 and MH ~ -21.5, respectively, at z ~ 0). We conclude that the massive galaxy population in the dense cores of present-day clusters were already in place at z = 1.6 and that in Cl 0218.3-0510 we are seeing continuing infall of less extreme, but still ultraluminous, star-forming galaxies onto a pre-existing structure.

KW - cosmology: observations

KW - galaxies: clusters: individual: Cl0218.3–0510

KW - galaxies: evolution

KW - galaxies: formation

U2 - 10.1088/0004-637X/782/1/19

DO - 10.1088/0004-637X/782/1/19

M3 - Article (Academic Journal)

SN - 0004-637X

VL - 782

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 19

ER -

The SCUBA-2 Cosmology Legacy Survey: Ultraluminous Star-forming Galaxies in a z = 1.6 Cluster

Abstract

Keywords

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Projects

PATT linked grant support for Bristol astrophysics and planetary studies

Research in planetary physics, astrophysics and cosmology at Bristol

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