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A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2.12 Submillimeter Galaxy ALESS67.1

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A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2.12 Submillimeter Galaxy ALESS67.1. / Chen, Chian-Chou; Hodge, J. A.; Smail, Ian et al.
In: The Astrophysical Journal, Vol. 846, No. 2, 108, 07.09.2017.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Chen, C-C, Hodge, JA, Smail, I, Swinbank, AM, Walter, F, Simpson, JM, Calistro Rivera, G, Bertoldi, F, Brandt, WN, Chapman, SC, da Cunha, E, Dannerbauer, H, De Breuck, C, Harrison, CM, Ivison, RJ, Karim, A, Knudsen, KK, Wardlow, JL, Weiß, A & van der Werf, PP 2017, 'A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2.12 Submillimeter Galaxy ALESS67.1', The Astrophysical Journal, vol. 846, no. 2, 108. https://doi.org/10.3847/1538-4357/aa863a

APA

Chen, C.-C., Hodge, J. A., Smail, I., Swinbank, A. M., Walter, F., Simpson, J. M., Calistro Rivera, G., Bertoldi, F., Brandt, W. N., Chapman, S. C., da Cunha, E., Dannerbauer, H., De Breuck, C., Harrison, C. M., Ivison, R. J., Karim, A., Knudsen, K. K., Wardlow, J. L., Weiß, A., & van der Werf, P. P. (2017). A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2.12 Submillimeter Galaxy ALESS67.1. The Astrophysical Journal, 846(2), Article 108. https://doi.org/10.3847/1538-4357/aa863a

Vancouver

Chen CC, Hodge JA, Smail I, Swinbank AM, Walter F, Simpson JM et al. A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2.12 Submillimeter Galaxy ALESS67.1. The Astrophysical Journal. 2017 Sept 7;846(2):108. doi: 10.3847/1538-4357/aa863a

Author

Chen, Chian-Chou ; Hodge, J. A. ; Smail, Ian et al. / A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2.12 Submillimeter Galaxy ALESS67.1. In: The Astrophysical Journal. 2017 ; Vol. 846, No. 2.

Bibtex

@article{132855af57db423880b548642fa90a25,
title = "A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2.12 Submillimeter Galaxy ALESS67.1",
abstract = "We present detailed studies of a z = 2.12 submillimeter galaxy, ALESS67.1, using sub-arcsecond resolution ALMA, adaptive optics-aided VLT/SINFONI, and Hubble Space Telescope (HST)/CANDELS data to investigate the kinematics and spatial distributions of dust emission (870 μm continuum), 12CO(J = 3-2), strong optical emission lines, and visible stars. Dynamical modeling of the optical emission lines suggests that ALESS67.1 is not a pure rotating disk but a merger, consistent with the apparent tidal features revealed in the HST imaging. Our sub-arcsecond resolution data set allows us to measure half-light radii for all the tracers, and we find a factor of 4-6 smaller sizes in dust continuum compared to all the other tracers, including 12CO; also, ultraviolet (UV) and Hα emission are significantly offset from the dust continuum. The spatial mismatch between the UV continuum and the cold dust and gas reservoir supports the explanation that geometrical effects are responsible for the offset of the dusty galaxy on the IRX-β diagram. Using a dynamical method we derive an {α }CO}=1.8+/- 1.0, consistent with other submillimeter galaxies (SMGs) that also have resolved CO and dust measurements. Assuming a single {α }CO} value we also derive resolved gas and star formation rate surface densities, and find that the core region of the galaxy (≲ 5 kpc) follows the trend of mergers on the Schmidt-Kennicutt relationship, whereas the outskirts (≳ 5 kpc) lie on the locus of normal star-forming galaxies, suggesting different star formation efficiencies within one galaxy. Our results caution against using single size or morphology for different tracers of the star formation activity and gas content of galaxies, and therefore argue the need to use spatially resolved, multi-wavelength observations to interpret the properties of SMGs, and perhaps even for z> 1 galaxies in general.",
keywords = "cosmology: observations, galaxies: evolution, galaxies: formation, galaxies: high-redshift, galaxies: star formation, submillimeter: galaxies",
author = "Chian-Chou Chen and Hodge, {J. A.} and Ian Smail and Swinbank, {A. M.} and Fabian Walter and Simpson, {J. M.} and {Calistro Rivera}, Gabriela and F. Bertoldi and Brandt, {W. N.} and Chapman, {S. C.} and {da Cunha}, Elisabete and H. Dannerbauer and {De Breuck}, C. and Harrison, {C. M.} and Ivison, {R. J.} and A. Karim and Knudsen, {K. K.} and Wardlow, {J. L.} and A. Wei{\ss} and {van der Werf}, {P. P.}",
note = "{\textcopyright} 2017. The American Astronomical Society. All rights reserved",
year = "2017",
month = sep,
day = "7",
doi = "10.3847/1538-4357/aa863a",
language = "English",
volume = "846",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "Institute of Physics Publishing",
number = "2",

}

RIS

TY - JOUR

T1 - A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2.12 Submillimeter Galaxy ALESS67.1

AU - Chen, Chian-Chou

AU - Hodge, J. A.

AU - Smail, Ian

AU - Swinbank, A. M.

AU - Walter, Fabian

AU - Simpson, J. M.

AU - Calistro Rivera, Gabriela

AU - Bertoldi, F.

AU - Brandt, W. N.

AU - Chapman, S. C.

AU - da Cunha, Elisabete

AU - Dannerbauer, H.

AU - De Breuck, C.

AU - Harrison, C. M.

AU - Ivison, R. J.

AU - Karim, A.

AU - Knudsen, K. K.

AU - Wardlow, J. L.

AU - Weiß, A.

AU - van der Werf, P. P.

N1 - © 2017. The American Astronomical Society. All rights reserved

PY - 2017/9/7

Y1 - 2017/9/7

N2 - We present detailed studies of a z = 2.12 submillimeter galaxy, ALESS67.1, using sub-arcsecond resolution ALMA, adaptive optics-aided VLT/SINFONI, and Hubble Space Telescope (HST)/CANDELS data to investigate the kinematics and spatial distributions of dust emission (870 μm continuum), 12CO(J = 3-2), strong optical emission lines, and visible stars. Dynamical modeling of the optical emission lines suggests that ALESS67.1 is not a pure rotating disk but a merger, consistent with the apparent tidal features revealed in the HST imaging. Our sub-arcsecond resolution data set allows us to measure half-light radii for all the tracers, and we find a factor of 4-6 smaller sizes in dust continuum compared to all the other tracers, including 12CO; also, ultraviolet (UV) and Hα emission are significantly offset from the dust continuum. The spatial mismatch between the UV continuum and the cold dust and gas reservoir supports the explanation that geometrical effects are responsible for the offset of the dusty galaxy on the IRX-β diagram. Using a dynamical method we derive an {α }CO}=1.8+/- 1.0, consistent with other submillimeter galaxies (SMGs) that also have resolved CO and dust measurements. Assuming a single {α }CO} value we also derive resolved gas and star formation rate surface densities, and find that the core region of the galaxy (≲ 5 kpc) follows the trend of mergers on the Schmidt-Kennicutt relationship, whereas the outskirts (≳ 5 kpc) lie on the locus of normal star-forming galaxies, suggesting different star formation efficiencies within one galaxy. Our results caution against using single size or morphology for different tracers of the star formation activity and gas content of galaxies, and therefore argue the need to use spatially resolved, multi-wavelength observations to interpret the properties of SMGs, and perhaps even for z> 1 galaxies in general.

AB - We present detailed studies of a z = 2.12 submillimeter galaxy, ALESS67.1, using sub-arcsecond resolution ALMA, adaptive optics-aided VLT/SINFONI, and Hubble Space Telescope (HST)/CANDELS data to investigate the kinematics and spatial distributions of dust emission (870 μm continuum), 12CO(J = 3-2), strong optical emission lines, and visible stars. Dynamical modeling of the optical emission lines suggests that ALESS67.1 is not a pure rotating disk but a merger, consistent with the apparent tidal features revealed in the HST imaging. Our sub-arcsecond resolution data set allows us to measure half-light radii for all the tracers, and we find a factor of 4-6 smaller sizes in dust continuum compared to all the other tracers, including 12CO; also, ultraviolet (UV) and Hα emission are significantly offset from the dust continuum. The spatial mismatch between the UV continuum and the cold dust and gas reservoir supports the explanation that geometrical effects are responsible for the offset of the dusty galaxy on the IRX-β diagram. Using a dynamical method we derive an {α }CO}=1.8+/- 1.0, consistent with other submillimeter galaxies (SMGs) that also have resolved CO and dust measurements. Assuming a single {α }CO} value we also derive resolved gas and star formation rate surface densities, and find that the core region of the galaxy (≲ 5 kpc) follows the trend of mergers on the Schmidt-Kennicutt relationship, whereas the outskirts (≳ 5 kpc) lie on the locus of normal star-forming galaxies, suggesting different star formation efficiencies within one galaxy. Our results caution against using single size or morphology for different tracers of the star formation activity and gas content of galaxies, and therefore argue the need to use spatially resolved, multi-wavelength observations to interpret the properties of SMGs, and perhaps even for z> 1 galaxies in general.

KW - cosmology: observations

KW - galaxies: evolution

KW - galaxies: formation

KW - galaxies: high-redshift

KW - galaxies: star formation

KW - submillimeter: galaxies

U2 - 10.3847/1538-4357/aa863a

DO - 10.3847/1538-4357/aa863a

M3 - Journal article

VL - 846

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 108

ER -