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

Chian Chou Chen, J. A. Hodge, Ian Smail, A. M. Swinbank, Fabian Walter, J. M. Simpson, Gabriela Calistro Rivera, F. Bertoldi, William Nielsen Brandt, S. C. Chapman, Elisabete Da Cunha, H. Dannerbauer, C. Da Breuck, C. M. Harrison, R. J. Ivison, A. Karim, K. K. Knudsen, J. L. Wardlow, A. Weiß, P. Van Der Werf

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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 , consistent with other submillimeter galaxies (SMGs) that also have resolved CO and dust measurements. Assuming a single value we also derive resolved gas and star formation rate surface densities, and find that the core region of the galaxy ( kpc) follows the trend of mergers on the Schmidt-Kennicutt relationship, whereas the outskirts ( 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 galaxies in general.

Original languageEnglish (US)
Article number108
JournalAstrophysical Journal
Volume846
Issue number2
DOIs
StatePublished - Sep 10 2017

Fingerprint

H II regions
molecular gases
dust
galaxies
stars
gas
tracer
merger
continuums
tracers
spatial mismatch
Hubble Space Telescope
light emission
star formation
gases
kinematics
diagram
cold
spatial distribution
wavelength

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Chen, C. C., Hodge, J. A., Smail, I., Swinbank, A. M., Walter, F., Simpson, J. M., ... Van Der Werf, 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. Astrophysical Journal, 846(2), [108]. https://doi.org/10.3847/1538-4357/aa863a
Chen, Chian Chou ; Hodge, J. A. ; Smail, Ian ; Swinbank, A. M. ; Walter, Fabian ; Simpson, J. M. ; Rivera, Gabriela Calistro ; Bertoldi, F. ; Brandt, William Nielsen ; Chapman, S. C. ; Da Cunha, Elisabete ; Dannerbauer, H. ; Da Breuck, C. ; Harrison, C. M. ; Ivison, R. J. ; Karim, A. ; Knudsen, K. K. ; Wardlow, J. L. ; Weiß, A. ; Van Der Werf, P. / A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2.12 Submillimeter Galaxy ALESS67.1. In: Astrophysical Journal. 2017 ; Vol. 846, No. 2.
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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 , consistent with other submillimeter galaxies (SMGs) that also have resolved CO and dust measurements. Assuming a single value we also derive resolved gas and star formation rate surface densities, and find that the core region of the galaxy ( kpc) follows the trend of mergers on the Schmidt-Kennicutt relationship, whereas the outskirts ( 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 galaxies in general.",
author = "Chen, {Chian Chou} and Hodge, {J. A.} and Ian Smail and Swinbank, {A. M.} and Fabian Walter and Simpson, {J. M.} and Rivera, {Gabriela Calistro} and F. Bertoldi and Brandt, {William Nielsen} and Chapman, {S. C.} and {Da Cunha}, Elisabete and H. Dannerbauer and {Da 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.",
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Chen, CC, Hodge, JA, Smail, I, Swinbank, AM, Walter, F, Simpson, JM, Rivera, GC, Bertoldi, F, Brandt, WN, Chapman, SC, Da Cunha, E, Dannerbauer, H, Da Breuck, C, Harrison, CM, Ivison, RJ, Karim, A, Knudsen, KK, Wardlow, JL, Weiß, A & Van Der Werf, 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', Astrophysical Journal, vol. 846, no. 2, 108. https://doi.org/10.3847/1538-4357/aa863a

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; Swinbank, A. M.; Walter, Fabian; Simpson, J. M.; Rivera, Gabriela Calistro; Bertoldi, F.; Brandt, William Nielsen; Chapman, S. C.; Da Cunha, Elisabete; Dannerbauer, H.; Da Breuck, C.; Harrison, C. M.; Ivison, R. J.; Karim, A.; Knudsen, K. K.; Wardlow, J. L.; Weiß, A.; Van Der Werf, P.

In: Astrophysical Journal, Vol. 846, No. 2, 108, 10.09.2017.

Research output: Contribution to journalArticle

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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 - Rivera, Gabriela Calistro

AU - Bertoldi, F.

AU - Brandt, William Nielsen

AU - Chapman, S. C.

AU - Da Cunha, Elisabete

AU - Dannerbauer, H.

AU - Da 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.

PY - 2017/9/10

Y1 - 2017/9/10

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 , consistent with other submillimeter galaxies (SMGs) that also have resolved CO and dust measurements. Assuming a single value we also derive resolved gas and star formation rate surface densities, and find that the core region of the galaxy ( kpc) follows the trend of mergers on the Schmidt-Kennicutt relationship, whereas the outskirts ( 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 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 , consistent with other submillimeter galaxies (SMGs) that also have resolved CO and dust measurements. Assuming a single value we also derive resolved gas and star formation rate surface densities, and find that the core region of the galaxy ( kpc) follows the trend of mergers on the Schmidt-Kennicutt relationship, whereas the outskirts ( 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 galaxies in general.

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