An alma survey of submillimeter galaxies in the extended Chandra deep field south: The redshift distribution and evolution of submillimeter galaxies

J. M. Simpson, A. M. Swinbank, Ian Smail, D. M. Alexander, W. N. Brandt, F. Bertoldi, C. De Breuck, S. C. Chapman, K. E.K. Coppin, E. Da Cunha, A. L.R. Danielson, H. Dannerbauer, T. R. Greve, J. A. Hodge, R. J. Ivison, A. Karim, K. K. Knudsen, B. M. Poggianti, E. Schinnerer, A. P. ThomsonF. Walter, J. L. Wardlow, A. Weiß, P. P. Van Der Werf

Research output: Contribution to journalArticle

125 Citations (Scopus)

Abstract

We present the first photometric redshift distribution for a large sample of 870 μm submillimeter galaxies (SMGs) with robust identifications based on observations with ALMA. In our analysis we consider 96 SMGs in the Extended Chandra Deep Field South, 77 of which have 4-19 band photometry. We model the SEDs for these 77 SMGs, deriving a median photometric redshift of z phot = 2.3 ± 0.1. The remaining 19 SMGs have insufficient photometry to derive photometric redshifts, but a stacking analysis of Herschel observations confirms they are not spurious. Assuming that these SMGs have an absolute H-band magnitude distribution comparable to that of a complete sample of z ∼ 1-2 SMGs, we demonstrate that they lie at slightly higher redshifts, raising the median redshift for SMGs to z phot = 2.5 ± 0.2. Critically we show that the proportion of galaxies undergoing an SMG-like phase at z ≥ 3 is at most 35% ± 5% of the total population. We derive a median stellar mass of M * = (8 ± 1) × 1010 M, although there are systematic uncertainties of up to 5 × for individual sources. Assuming that the star formation activity in SMGs has a timescale of ∼100 Myr, we show that their descendants at z ∼ 0 would have a space density and M H distribution that are in good agreement with those of local ellipticals. In addition, the inferred mass-weighted ages of the local ellipticals broadly agree with the look-back times of the SMG events. Taken together, these results are consistent with a simple model that identifies SMGs as events that form most of the stars seen in the majority of luminous elliptical galaxies at the present day.

Original languageEnglish (US)
Article number125
JournalAstrophysical Journal
Volume788
Issue number2
DOIs
StatePublished - Jun 20 2014

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galaxies
stacking
timescale
photometry
distribution
space density
analysis
elliptical galaxies
stellar mass
star formation
proportion
stars

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Simpson, J. M. ; Swinbank, A. M. ; Smail, Ian ; Alexander, D. M. ; Brandt, W. N. ; Bertoldi, F. ; De Breuck, C. ; Chapman, S. C. ; Coppin, K. E.K. ; Da Cunha, E. ; Danielson, A. L.R. ; Dannerbauer, H. ; Greve, T. R. ; Hodge, J. A. ; Ivison, R. J. ; Karim, A. ; Knudsen, K. K. ; Poggianti, B. M. ; Schinnerer, E. ; Thomson, A. P. ; Walter, F. ; Wardlow, J. L. ; Weiß, A. ; Van Der Werf, P. P. / An alma survey of submillimeter galaxies in the extended Chandra deep field south : The redshift distribution and evolution of submillimeter galaxies. In: Astrophysical Journal. 2014 ; Vol. 788, No. 2.
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abstract = "We present the first photometric redshift distribution for a large sample of 870 μm submillimeter galaxies (SMGs) with robust identifications based on observations with ALMA. In our analysis we consider 96 SMGs in the Extended Chandra Deep Field South, 77 of which have 4-19 band photometry. We model the SEDs for these 77 SMGs, deriving a median photometric redshift of z phot = 2.3 ± 0.1. The remaining 19 SMGs have insufficient photometry to derive photometric redshifts, but a stacking analysis of Herschel observations confirms they are not spurious. Assuming that these SMGs have an absolute H-band magnitude distribution comparable to that of a complete sample of z ∼ 1-2 SMGs, we demonstrate that they lie at slightly higher redshifts, raising the median redshift for SMGs to z phot = 2.5 ± 0.2. Critically we show that the proportion of galaxies undergoing an SMG-like phase at z ≥ 3 is at most 35{\%} ± 5{\%} of the total population. We derive a median stellar mass of M * = (8 ± 1) × 1010 M, although there are systematic uncertainties of up to 5 × for individual sources. Assuming that the star formation activity in SMGs has a timescale of ∼100 Myr, we show that their descendants at z ∼ 0 would have a space density and M H distribution that are in good agreement with those of local ellipticals. In addition, the inferred mass-weighted ages of the local ellipticals broadly agree with the look-back times of the SMG events. Taken together, these results are consistent with a simple model that identifies SMGs as events that form most of the stars seen in the majority of luminous elliptical galaxies at the present day.",
author = "Simpson, {J. M.} and Swinbank, {A. M.} and Ian Smail and Alexander, {D. M.} and Brandt, {W. N.} and F. Bertoldi and {De Breuck}, C. and Chapman, {S. C.} and Coppin, {K. E.K.} and {Da Cunha}, E. and Danielson, {A. L.R.} and H. Dannerbauer and Greve, {T. R.} and Hodge, {J. A.} and Ivison, {R. J.} and A. Karim and Knudsen, {K. K.} and Poggianti, {B. M.} and E. Schinnerer and Thomson, {A. P.} and F. Walter and Wardlow, {J. L.} and A. Wei{\ss} and {Van Der Werf}, {P. P.}",
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Simpson, JM, Swinbank, AM, Smail, I, Alexander, DM, Brandt, WN, Bertoldi, F, De Breuck, C, Chapman, SC, Coppin, KEK, Da Cunha, E, Danielson, ALR, Dannerbauer, H, Greve, TR, Hodge, JA, Ivison, RJ, Karim, A, Knudsen, KK, Poggianti, BM, Schinnerer, E, Thomson, AP, Walter, F, Wardlow, JL, Weiß, A & Van Der Werf, PP 2014, 'An alma survey of submillimeter galaxies in the extended Chandra deep field south: The redshift distribution and evolution of submillimeter galaxies', Astrophysical Journal, vol. 788, no. 2, 125. https://doi.org/10.1088/0004-637X/788/2/125

An alma survey of submillimeter galaxies in the extended Chandra deep field south : The redshift distribution and evolution of submillimeter galaxies. / Simpson, J. M.; Swinbank, A. M.; Smail, Ian; Alexander, D. M.; Brandt, W. N.; Bertoldi, F.; De Breuck, C.; Chapman, S. C.; Coppin, K. E.K.; Da Cunha, E.; Danielson, A. L.R.; Dannerbauer, H.; Greve, T. R.; Hodge, J. A.; Ivison, R. J.; Karim, A.; Knudsen, K. K.; Poggianti, B. M.; Schinnerer, E.; Thomson, A. P.; Walter, F.; Wardlow, J. L.; Weiß, A.; Van Der Werf, P. P.

In: Astrophysical Journal, Vol. 788, No. 2, 125, 20.06.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - An alma survey of submillimeter galaxies in the extended Chandra deep field south

T2 - The redshift distribution and evolution of submillimeter galaxies

AU - Simpson, J. M.

AU - Swinbank, A. M.

AU - Smail, Ian

AU - Alexander, D. M.

AU - Brandt, W. N.

AU - Bertoldi, F.

AU - De Breuck, C.

AU - Chapman, S. C.

AU - Coppin, K. E.K.

AU - Da Cunha, E.

AU - Danielson, A. L.R.

AU - Dannerbauer, H.

AU - Greve, T. R.

AU - Hodge, J. A.

AU - Ivison, R. J.

AU - Karim, A.

AU - Knudsen, K. K.

AU - Poggianti, B. M.

AU - Schinnerer, E.

AU - Thomson, A. P.

AU - Walter, F.

AU - Wardlow, J. L.

AU - Weiß, A.

AU - Van Der Werf, P. P.

PY - 2014/6/20

Y1 - 2014/6/20

N2 - We present the first photometric redshift distribution for a large sample of 870 μm submillimeter galaxies (SMGs) with robust identifications based on observations with ALMA. In our analysis we consider 96 SMGs in the Extended Chandra Deep Field South, 77 of which have 4-19 band photometry. We model the SEDs for these 77 SMGs, deriving a median photometric redshift of z phot = 2.3 ± 0.1. The remaining 19 SMGs have insufficient photometry to derive photometric redshifts, but a stacking analysis of Herschel observations confirms they are not spurious. Assuming that these SMGs have an absolute H-band magnitude distribution comparable to that of a complete sample of z ∼ 1-2 SMGs, we demonstrate that they lie at slightly higher redshifts, raising the median redshift for SMGs to z phot = 2.5 ± 0.2. Critically we show that the proportion of galaxies undergoing an SMG-like phase at z ≥ 3 is at most 35% ± 5% of the total population. We derive a median stellar mass of M * = (8 ± 1) × 1010 M, although there are systematic uncertainties of up to 5 × for individual sources. Assuming that the star formation activity in SMGs has a timescale of ∼100 Myr, we show that their descendants at z ∼ 0 would have a space density and M H distribution that are in good agreement with those of local ellipticals. In addition, the inferred mass-weighted ages of the local ellipticals broadly agree with the look-back times of the SMG events. Taken together, these results are consistent with a simple model that identifies SMGs as events that form most of the stars seen in the majority of luminous elliptical galaxies at the present day.

AB - We present the first photometric redshift distribution for a large sample of 870 μm submillimeter galaxies (SMGs) with robust identifications based on observations with ALMA. In our analysis we consider 96 SMGs in the Extended Chandra Deep Field South, 77 of which have 4-19 band photometry. We model the SEDs for these 77 SMGs, deriving a median photometric redshift of z phot = 2.3 ± 0.1. The remaining 19 SMGs have insufficient photometry to derive photometric redshifts, but a stacking analysis of Herschel observations confirms they are not spurious. Assuming that these SMGs have an absolute H-band magnitude distribution comparable to that of a complete sample of z ∼ 1-2 SMGs, we demonstrate that they lie at slightly higher redshifts, raising the median redshift for SMGs to z phot = 2.5 ± 0.2. Critically we show that the proportion of galaxies undergoing an SMG-like phase at z ≥ 3 is at most 35% ± 5% of the total population. We derive a median stellar mass of M * = (8 ± 1) × 1010 M, although there are systematic uncertainties of up to 5 × for individual sources. Assuming that the star formation activity in SMGs has a timescale of ∼100 Myr, we show that their descendants at z ∼ 0 would have a space density and M H distribution that are in good agreement with those of local ellipticals. In addition, the inferred mass-weighted ages of the local ellipticals broadly agree with the look-back times of the SMG events. Taken together, these results are consistent with a simple model that identifies SMGs as events that form most of the stars seen in the majority of luminous elliptical galaxies at the present day.

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