THE SCUBA-2 COSMOLOGY LEGACY SURVEY: ALMA RESOLVES THE REST-FRAME FAR-INFRARED EMISSION OF SUB-MILLIMETER GALAXIES

J. M. Simpson; Ian Smail; A. M. Swinbank; O. Almaini; A. W. Blain; M. N. Bremer; S. C. Chapman; Chian-Chou Chen; C. Conselice; K. E. K. Coppin; A. L. R. Danielson; J. S. Dunlop; A. C. Edge; D. Farrah; J. E. Geach; W. G. Hartley; R. J. Ivison; A. Karim; C. Lani; C. -J. Ma; R. Meijerink; M. J. Michalowski; Alice Mortlock; D. Scott; C. J. Simpson; M. Spaans; A. P. Thomson; E. van Kampen; P. P. van der Werf

doi:10.1088/0004-637X/799/1/81

THE SCUBA-2 COSMOLOGY LEGACY SURVEY: ALMA RESOLVES THE REST-FRAME FAR-INFRARED EMISSION OF SUB-MILLIMETER GALAXIES

J. M. Simpson^*, Ian Smail, A. M. Swinbank, O. Almaini, A. W. Blain, M. N. Bremer, S. C. Chapman, Chian-Chou Chen, C. Conselice, K. E. K. Coppin, A. L. R. Danielson, J. S. Dunlop, A. C. Edge, D. Farrah, J. E. Geach, W. G. Hartley, R. J. Ivison, A. Karim, C. Lani, C. -J. MaR. Meijerink, M. J. Michalowski, Alice Mortlock, D. Scott, C. J. Simpson, M. Spaans, A. P. Thomson, E. van Kampen, P. P. van der Werf

^*Corresponding author for this work

School of Physics and Astronomy

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

Abstract / Description of output

We present high-resolution (0.'' 3) Atacama Large Millimeter Array 870 mu m imaging of 52 sub-millimeter galaxies (SMGs) in the Ultra Deep Survey field to investigate the size and morphology of the sub-millimeter (sub-mm) emission on 2-10 kpc scales. We derive a median intrinsic angular size of FWHM = 0.'' 30 +/- 0.'' 04 for the 23 SMGs in the sample detected at a signal-to-noise ratio (S/N) > 10. Using the photometric redshifts of the SMGs we show that this corresponds to a median physical half-light diameter of 2.4 +/- 0.2 kpc. A stacking analysis of the SMGs detected at S/N <10 shows they have sizes consistent with the 870 mu m bright SMGs in the sample. We compare our results to the sizes of SMGs derived from other multi-wavelength studies, and show that the rest-frame similar to 250 mu m sizes of SMGs are consistent with studies of resolved (CO)-C-12 (J = 3-2 to 7-6) emission lines, but that sizes derived from 1.4 GHz imaging appear to be approximately two times larger on average, which we attribute to cosmic ray diffusion. The rest-frame optical sizes of SMGs are around four times larger than the sub-millimeter sizes, indicating that the star formation in these galaxies is compact relative to the pre-existing stellar distribution. The size of the starburst region in SMGs is consistent with the majority of the star formation occurring in a central region, a few kiloparsecs in extent, with a median star formation rate surface density of 90 +/- 30 M-circle dot yr(-1) kpc(-2), which may suggest that we are witnessing an intense period of bulge growth in these galaxies.

Original language	English
Article number	81
Number of pages	14
Journal	Astrophysical Journal
Volume	799
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/799/1/81
Publication status	Published - 20 Jan 2015

Keywords / Materials (for Non-textual outputs)

galaxies: high-redshift
galaxies: starburst
STAR-FORMING GALAXIES
DEEP FIELD-SOUTH
HUBBLE-SPACE-TELESCOPE
SIMILAR-TO 2
COMPACT QUIESCENT GALAXIES
HIGH-REDSHIFT
INTERSTELLAR-MEDIUM
MOLECULAR GAS
RADIATION PRESSURE
MASSIVE GALAXIES

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10.1088/0004-637X/799/1/81

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Simpson, J. M., Smail, I., Swinbank, A. M., Almaini, O., Blain, A. W., Bremer, M. N., Chapman, S. C., Chen, C.-C., Conselice, C., Coppin, K. E. K., Danielson, A. L. R., Dunlop, J. S., Edge, A. C., Farrah, D., Geach, J. E., Hartley, W. G., Ivison, R. J., Karim, A., Lani, C., ... van der Werf, P. P. (2015). THE SCUBA-2 COSMOLOGY LEGACY SURVEY: ALMA RESOLVES THE REST-FRAME FAR-INFRARED EMISSION OF SUB-MILLIMETER GALAXIES. Astrophysical Journal, 799(1), Article 81. https://doi.org/10.1088/0004-637X/799/1/81

@article{21db3f370bf94b689ff5e8c20b8ea0ae,

title = "THE SCUBA-2 COSMOLOGY LEGACY SURVEY: ALMA RESOLVES THE REST-FRAME FAR-INFRARED EMISSION OF SUB-MILLIMETER GALAXIES",

abstract = "We present high-resolution (0.'' 3) Atacama Large Millimeter Array 870 mu m imaging of 52 sub-millimeter galaxies (SMGs) in the Ultra Deep Survey field to investigate the size and morphology of the sub-millimeter (sub-mm) emission on 2-10 kpc scales. We derive a median intrinsic angular size of FWHM = 0.'' 30 +/- 0.'' 04 for the 23 SMGs in the sample detected at a signal-to-noise ratio (S/N) > 10. Using the photometric redshifts of the SMGs we show that this corresponds to a median physical half-light diameter of 2.4 +/- 0.2 kpc. A stacking analysis of the SMGs detected at S/N <10 shows they have sizes consistent with the 870 mu m bright SMGs in the sample. We compare our results to the sizes of SMGs derived from other multi-wavelength studies, and show that the rest-frame similar to 250 mu m sizes of SMGs are consistent with studies of resolved (CO)-C-12 (J = 3-2 to 7-6) emission lines, but that sizes derived from 1.4 GHz imaging appear to be approximately two times larger on average, which we attribute to cosmic ray diffusion. The rest-frame optical sizes of SMGs are around four times larger than the sub-millimeter sizes, indicating that the star formation in these galaxies is compact relative to the pre-existing stellar distribution. The size of the starburst region in SMGs is consistent with the majority of the star formation occurring in a central region, a few kiloparsecs in extent, with a median star formation rate surface density of 90 +/- 30 M-circle dot yr(-1) kpc(-2), which may suggest that we are witnessing an intense period of bulge growth in these galaxies.",

keywords = "galaxies: high-redshift, galaxies: starburst, STAR-FORMING GALAXIES, DEEP FIELD-SOUTH, HUBBLE-SPACE-TELESCOPE, SIMILAR-TO 2, COMPACT QUIESCENT GALAXIES, HIGH-REDSHIFT, INTERSTELLAR-MEDIUM, MOLECULAR GAS, RADIATION PRESSURE, MASSIVE GALAXIES",

author = "Simpson, {J. M.} and Ian Smail and Swinbank, {A. M.} and O. Almaini and Blain, {A. W.} and Bremer, {M. N.} and Chapman, {S. C.} and Chian-Chou Chen and C. Conselice and Coppin, {K. E. K.} and Danielson, {A. L. R.} and Dunlop, {J. S.} and Edge, {A. C.} and D. Farrah and Geach, {J. E.} and Hartley, {W. G.} and Ivison, {R. J.} and A. Karim and C. Lani and Ma, {C. -J.} and R. Meijerink and Michalowski, {M. J.} and Alice Mortlock and D. Scott and Simpson, {C. J.} and M. Spaans and Thomson, {A. P.} and {van Kampen}, E. and {van der Werf}, {P. P.}",

year = "2015",

month = jan,

day = "20",

doi = "10.1088/0004-637X/799/1/81",

language = "English",

volume = "799",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing",

number = "1",

}

Simpson, JM, Smail, I, Swinbank, AM, Almaini, O, Blain, AW, Bremer, MN, Chapman, SC, Chen, C-C, Conselice, C, Coppin, KEK, Danielson, ALR, Dunlop, JS, Edge, AC, Farrah, D, Geach, JE, Hartley, WG, Ivison, RJ, Karim, A, Lani, C, Ma, C-J, Meijerink, R, Michalowski, MJ, Mortlock, A, Scott, D, Simpson, CJ, Spaans, M, Thomson, AP, van Kampen, E & van der Werf, PP 2015, 'THE SCUBA-2 COSMOLOGY LEGACY SURVEY: ALMA RESOLVES THE REST-FRAME FAR-INFRARED EMISSION OF SUB-MILLIMETER GALAXIES', Astrophysical Journal, vol. 799, no. 1, 81. https://doi.org/10.1088/0004-637X/799/1/81

TY - JOUR

T1 - THE SCUBA-2 COSMOLOGY LEGACY SURVEY

T2 - ALMA RESOLVES THE REST-FRAME FAR-INFRARED EMISSION OF SUB-MILLIMETER GALAXIES

AU - Simpson, J. M.

AU - Smail, Ian

AU - Swinbank, A. M.

AU - Almaini, O.

AU - Blain, A. W.

AU - Bremer, M. N.

AU - Chapman, S. C.

AU - Chen, Chian-Chou

AU - Conselice, C.

AU - Coppin, K. E. K.

AU - Danielson, A. L. R.

AU - Dunlop, J. S.

AU - Edge, A. C.

AU - Farrah, D.

AU - Geach, J. E.

AU - Hartley, W. G.

AU - Ivison, R. J.

AU - Karim, A.

AU - Lani, C.

AU - Ma, C. -J.

AU - Meijerink, R.

AU - Michalowski, M. J.

AU - Mortlock, Alice

AU - Scott, D.

AU - Simpson, C. J.

AU - Spaans, M.

AU - Thomson, A. P.

AU - van Kampen, E.

AU - van der Werf, P. P.

PY - 2015/1/20

Y1 - 2015/1/20

N2 - We present high-resolution (0.'' 3) Atacama Large Millimeter Array 870 mu m imaging of 52 sub-millimeter galaxies (SMGs) in the Ultra Deep Survey field to investigate the size and morphology of the sub-millimeter (sub-mm) emission on 2-10 kpc scales. We derive a median intrinsic angular size of FWHM = 0.'' 30 +/- 0.'' 04 for the 23 SMGs in the sample detected at a signal-to-noise ratio (S/N) > 10. Using the photometric redshifts of the SMGs we show that this corresponds to a median physical half-light diameter of 2.4 +/- 0.2 kpc. A stacking analysis of the SMGs detected at S/N <10 shows they have sizes consistent with the 870 mu m bright SMGs in the sample. We compare our results to the sizes of SMGs derived from other multi-wavelength studies, and show that the rest-frame similar to 250 mu m sizes of SMGs are consistent with studies of resolved (CO)-C-12 (J = 3-2 to 7-6) emission lines, but that sizes derived from 1.4 GHz imaging appear to be approximately two times larger on average, which we attribute to cosmic ray diffusion. The rest-frame optical sizes of SMGs are around four times larger than the sub-millimeter sizes, indicating that the star formation in these galaxies is compact relative to the pre-existing stellar distribution. The size of the starburst region in SMGs is consistent with the majority of the star formation occurring in a central region, a few kiloparsecs in extent, with a median star formation rate surface density of 90 +/- 30 M-circle dot yr(-1) kpc(-2), which may suggest that we are witnessing an intense period of bulge growth in these galaxies.

AB - We present high-resolution (0.'' 3) Atacama Large Millimeter Array 870 mu m imaging of 52 sub-millimeter galaxies (SMGs) in the Ultra Deep Survey field to investigate the size and morphology of the sub-millimeter (sub-mm) emission on 2-10 kpc scales. We derive a median intrinsic angular size of FWHM = 0.'' 30 +/- 0.'' 04 for the 23 SMGs in the sample detected at a signal-to-noise ratio (S/N) > 10. Using the photometric redshifts of the SMGs we show that this corresponds to a median physical half-light diameter of 2.4 +/- 0.2 kpc. A stacking analysis of the SMGs detected at S/N <10 shows they have sizes consistent with the 870 mu m bright SMGs in the sample. We compare our results to the sizes of SMGs derived from other multi-wavelength studies, and show that the rest-frame similar to 250 mu m sizes of SMGs are consistent with studies of resolved (CO)-C-12 (J = 3-2 to 7-6) emission lines, but that sizes derived from 1.4 GHz imaging appear to be approximately two times larger on average, which we attribute to cosmic ray diffusion. The rest-frame optical sizes of SMGs are around four times larger than the sub-millimeter sizes, indicating that the star formation in these galaxies is compact relative to the pre-existing stellar distribution. The size of the starburst region in SMGs is consistent with the majority of the star formation occurring in a central region, a few kiloparsecs in extent, with a median star formation rate surface density of 90 +/- 30 M-circle dot yr(-1) kpc(-2), which may suggest that we are witnessing an intense period of bulge growth in these galaxies.

KW - galaxies: high-redshift

KW - galaxies: starburst

KW - STAR-FORMING GALAXIES

KW - DEEP FIELD-SOUTH

KW - HUBBLE-SPACE-TELESCOPE

KW - SIMILAR-TO 2

KW - COMPACT QUIESCENT GALAXIES

KW - HIGH-REDSHIFT

KW - INTERSTELLAR-MEDIUM

KW - MOLECULAR GAS

KW - RADIATION PRESSURE

KW - MASSIVE GALAXIES

U2 - 10.1088/0004-637X/799/1/81

DO - 10.1088/0004-637X/799/1/81

M3 - Article

SN - 0004-637X

VL - 799

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 81

ER -

THE SCUBA-2 COSMOLOGY LEGACY SURVEY: ALMA RESOLVES THE REST-FRAME FAR-INFRARED EMISSION OF SUB-MILLIMETER GALAXIES

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