VLA and ALMA IMAGING of INTENSE GALAXY-WIDE STAR FORMATION in z ∼ 2 GALAXIES

W. Rujopakarn, J. S. Dunlop, G. H. Rieke, R. J. Ivison, A. Cibinel, K. Nyland, P. Jagannathan, J. D. Silverman, D. M. Alexander, A. D. Biggs, S. Bhatnagar, D. R. Ballantyne, M. Dickinson, D. Elbaz, J. E. Geach, C. C. Hayward, A. Kirkpatrick, R. J. McLure, M. J. Michałowski, N. A. Miller & 13 others D. Narayanan, F. N. Owen, M. Pannella, C. Papovich, A. Pope, U. Rau, B. E. Robertson, D. Scott, A. M. Swinbank, P. Van Der Werf, E. Van Kampen, B. J. Weiner, Rogier Windhorst

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We present ≃0.″4 resolution extinction-independent distributions of star formation and dust in 11 star-forming galaxies (SFGs) at z = 1.3-3.0. These galaxies are selected from sensitive blank-field surveys of the 2′ ×2′ Hubble Ultra-Deep Field at λ = 5 cm and 1.3 mm using the Karl G. Jansky Very Large Array and Atacama Large Millimeter/submillimeter Array. They have star formation rates (SFRs), stellar masses, and dust properties representative of massive main-sequence SFGs at z ∼ 2. Morphological classification performed on spatially resolved stellar mass maps indicates a mixture of disk and morphologically disturbed systems; half of the sample harbor X-ray active galactic nuclei (AGNs), thereby representing a diversity of z ∼ 2 SFGs undergoing vigorous mass assembly. We find that their intense star formation most frequently occurs at the location of stellar-mass concentration and extends over an area comparable to their stellar-mass distribution, with a median diameter of 4.2 ±1.8 kpc. This provides direct evidence of galaxy-wide star formation in distant blank-field-selected main-sequence SFGs. The typical galactic-average SFR surface density is 2.5 M o yr-1 kpc-2, sufficiently high to drive outflows. In X-ray-selected AGN where radio emission is enhanced over the level associated with star formation, the radio excess pinpoints the AGNs, which are found to be cospatial with star formation. The median extinction-independent size of main-sequence SFGs is two times larger than those of bright submillimeter galaxies, whose SFRs are 3-8 times larger, providing a constraint on the characteristic SFR (∼300 M o yr-1) above which a significant population of more compact SFGs appears to emerge.

Original languageEnglish (US)
Article number12
JournalAstrophysical Journal
Volume833
Issue number1
DOIs
StatePublished - Dec 10 2016

Fingerprint

star formation
galaxies
star formation rate
stellar mass
main sequence stars
active galactic nuclei
extinction
radio
dust
blanks
stars
field survey
harbor
outflow
Very Large Array (VLA)
harbors
rate
radio emission
massive stars
mass distribution

Keywords

  • galaxies: active
  • galaxies: evolution
  • galaxies: high-redshift
  • galaxies: star formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Rujopakarn, W., Dunlop, J. S., Rieke, G. H., Ivison, R. J., Cibinel, A., Nyland, K., ... Windhorst, R. (2016). VLA and ALMA IMAGING of INTENSE GALAXY-WIDE STAR FORMATION in z ∼ 2 GALAXIES. Astrophysical Journal, 833(1), [12]. https://doi.org/10.3847/0004-637X/833/1/12

VLA and ALMA IMAGING of INTENSE GALAXY-WIDE STAR FORMATION in z ∼ 2 GALAXIES. / Rujopakarn, W.; Dunlop, J. S.; Rieke, G. H.; Ivison, R. J.; Cibinel, A.; Nyland, K.; Jagannathan, P.; Silverman, J. D.; Alexander, D. M.; Biggs, A. D.; Bhatnagar, S.; Ballantyne, D. R.; Dickinson, M.; Elbaz, D.; Geach, J. E.; Hayward, C. C.; Kirkpatrick, A.; McLure, R. J.; Michałowski, M. J.; Miller, N. A.; Narayanan, D.; Owen, F. N.; Pannella, M.; Papovich, C.; Pope, A.; Rau, U.; Robertson, B. E.; Scott, D.; Swinbank, A. M.; Werf, P. Van Der; Kampen, E. Van; Weiner, B. J.; Windhorst, Rogier.

In: Astrophysical Journal, Vol. 833, No. 1, 12, 10.12.2016.

Research output: Contribution to journalArticle

Rujopakarn, W, Dunlop, JS, Rieke, GH, Ivison, RJ, Cibinel, A, Nyland, K, Jagannathan, P, Silverman, JD, Alexander, DM, Biggs, AD, Bhatnagar, S, Ballantyne, DR, Dickinson, M, Elbaz, D, Geach, JE, Hayward, CC, Kirkpatrick, A, McLure, RJ, Michałowski, MJ, Miller, NA, Narayanan, D, Owen, FN, Pannella, M, Papovich, C, Pope, A, Rau, U, Robertson, BE, Scott, D, Swinbank, AM, Werf, PVD, Kampen, EV, Weiner, BJ & Windhorst, R 2016, 'VLA and ALMA IMAGING of INTENSE GALAXY-WIDE STAR FORMATION in z ∼ 2 GALAXIES', Astrophysical Journal, vol. 833, no. 1, 12. https://doi.org/10.3847/0004-637X/833/1/12
Rujopakarn W, Dunlop JS, Rieke GH, Ivison RJ, Cibinel A, Nyland K et al. VLA and ALMA IMAGING of INTENSE GALAXY-WIDE STAR FORMATION in z ∼ 2 GALAXIES. Astrophysical Journal. 2016 Dec 10;833(1). 12. https://doi.org/10.3847/0004-637X/833/1/12
Rujopakarn, W. ; Dunlop, J. S. ; Rieke, G. H. ; Ivison, R. J. ; Cibinel, A. ; Nyland, K. ; Jagannathan, P. ; Silverman, J. D. ; Alexander, D. M. ; Biggs, A. D. ; Bhatnagar, S. ; Ballantyne, D. R. ; Dickinson, M. ; Elbaz, D. ; Geach, J. E. ; Hayward, C. C. ; Kirkpatrick, A. ; McLure, R. J. ; Michałowski, M. J. ; Miller, N. A. ; Narayanan, D. ; Owen, F. N. ; Pannella, M. ; Papovich, C. ; Pope, A. ; Rau, U. ; Robertson, B. E. ; Scott, D. ; Swinbank, A. M. ; Werf, P. Van Der ; Kampen, E. Van ; Weiner, B. J. ; Windhorst, Rogier. / VLA and ALMA IMAGING of INTENSE GALAXY-WIDE STAR FORMATION in z ∼ 2 GALAXIES. In: Astrophysical Journal. 2016 ; Vol. 833, No. 1.
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abstract = "We present ≃0.″4 resolution extinction-independent distributions of star formation and dust in 11 star-forming galaxies (SFGs) at z = 1.3-3.0. These galaxies are selected from sensitive blank-field surveys of the 2′ ×2′ Hubble Ultra-Deep Field at λ = 5 cm and 1.3 mm using the Karl G. Jansky Very Large Array and Atacama Large Millimeter/submillimeter Array. They have star formation rates (SFRs), stellar masses, and dust properties representative of massive main-sequence SFGs at z ∼ 2. Morphological classification performed on spatially resolved stellar mass maps indicates a mixture of disk and morphologically disturbed systems; half of the sample harbor X-ray active galactic nuclei (AGNs), thereby representing a diversity of z ∼ 2 SFGs undergoing vigorous mass assembly. We find that their intense star formation most frequently occurs at the location of stellar-mass concentration and extends over an area comparable to their stellar-mass distribution, with a median diameter of 4.2 ±1.8 kpc. This provides direct evidence of galaxy-wide star formation in distant blank-field-selected main-sequence SFGs. The typical galactic-average SFR surface density is 2.5 M o yr-1 kpc-2, sufficiently high to drive outflows. In X-ray-selected AGN where radio emission is enhanced over the level associated with star formation, the radio excess pinpoints the AGNs, which are found to be cospatial with star formation. The median extinction-independent size of main-sequence SFGs is two times larger than those of bright submillimeter galaxies, whose SFRs are 3-8 times larger, providing a constraint on the characteristic SFR (∼300 M o yr-1) above which a significant population of more compact SFGs appears to emerge.",
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AU - Dunlop, J. S.

AU - Rieke, G. H.

AU - Ivison, R. J.

AU - Cibinel, A.

AU - Nyland, K.

AU - Jagannathan, P.

AU - Silverman, J. D.

AU - Alexander, D. M.

AU - Biggs, A. D.

AU - Bhatnagar, S.

AU - Ballantyne, D. R.

AU - Dickinson, M.

AU - Elbaz, D.

AU - Geach, J. E.

AU - Hayward, C. C.

AU - Kirkpatrick, A.

AU - McLure, R. J.

AU - Michałowski, M. J.

AU - Miller, N. A.

AU - Narayanan, D.

AU - Owen, F. N.

AU - Pannella, M.

AU - Papovich, C.

AU - Pope, A.

AU - Rau, U.

AU - Robertson, B. E.

AU - Scott, D.

AU - Swinbank, A. M.

AU - Werf, P. Van Der

AU - Kampen, E. Van

AU - Weiner, B. J.

AU - Windhorst, Rogier

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AB - We present ≃0.″4 resolution extinction-independent distributions of star formation and dust in 11 star-forming galaxies (SFGs) at z = 1.3-3.0. These galaxies are selected from sensitive blank-field surveys of the 2′ ×2′ Hubble Ultra-Deep Field at λ = 5 cm and 1.3 mm using the Karl G. Jansky Very Large Array and Atacama Large Millimeter/submillimeter Array. They have star formation rates (SFRs), stellar masses, and dust properties representative of massive main-sequence SFGs at z ∼ 2. Morphological classification performed on spatially resolved stellar mass maps indicates a mixture of disk and morphologically disturbed systems; half of the sample harbor X-ray active galactic nuclei (AGNs), thereby representing a diversity of z ∼ 2 SFGs undergoing vigorous mass assembly. We find that their intense star formation most frequently occurs at the location of stellar-mass concentration and extends over an area comparable to their stellar-mass distribution, with a median diameter of 4.2 ±1.8 kpc. This provides direct evidence of galaxy-wide star formation in distant blank-field-selected main-sequence SFGs. The typical galactic-average SFR surface density is 2.5 M o yr-1 kpc-2, sufficiently high to drive outflows. In X-ray-selected AGN where radio emission is enhanced over the level associated with star formation, the radio excess pinpoints the AGNs, which are found to be cospatial with star formation. The median extinction-independent size of main-sequence SFGs is two times larger than those of bright submillimeter galaxies, whose SFRs are 3-8 times larger, providing a constraint on the characteristic SFR (∼300 M o yr-1) above which a significant population of more compact SFGs appears to emerge.

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KW - galaxies: evolution

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KW - galaxies: star formation

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