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. Michalowski; N. A. Miller; 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; R. A. Windhorst

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. Michalowski, N. A. MillerD. 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, R. A. Windhorst

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Abstract

We present $\simeq$0$.\!\!^{\prime\prime}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 $2' \times 2'$ Hubble Ultra-Deep Field at $\lambda = 5$ cm and 1.3 mm using the Karl G. Jansky Very Large Array (VLA) and Atacama Large Millimeter/submillimeter Array (ALMA). They have star-formation rates (SFRs), stellar masses, and dust properties representative of massive main-sequence SFGs at $z \sim 2$. 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 (AGN), thereby representing a diversity of $z \sim 2$ 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 $4.2 \pm 1.8$ kpc. This provides direct evidence for galaxy-wide star formation in distant, blank-field-selected main-sequence SFGs. The typical galactic-average SFR surface density is 2.5 M$_{\odot}$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 AGN, which are found to be co-spatial 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 ($\sim300$ M$_{\odot}$yr$^{-1}$) above which a significant population of more compact star-forming galaxies appears to emerge.

Original language	English
Journal	Astrophysical Journal
Volume	833
Issue number	1
Publication status	Published - 1 Dec 2016

Keywords

Astrophysics - Astrophysics of Galaxies
Astrophysics - Cosmology and Nongalactic Astrophysics

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http://adsabs.harvard.edu/abs/2016arXiv160707710R

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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., Michalowski, M. J., ... Windhorst, R. A. (2016). VLA and ALMA Imaging of Intense, Galaxy-Wide Star Formation in z ~ 2 Galaxies. Astrophysical Journal, 833(1). http://adsabs.harvard.edu/abs/2016arXiv160707710R

@article{62838c818ab348a6aa261d905f8bcb69,

title = "VLA and ALMA Imaging of Intense, Galaxy-Wide Star Formation in z ~ 2 Galaxies",

abstract = "We present $\simeq$0$.\!\!^{\prime\prime}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 $2' \times 2'$ Hubble Ultra-Deep Field at $\lambda = 5$ cm and 1.3 mm using the Karl G. Jansky Very Large Array (VLA) and Atacama Large Millimeter/submillimeter Array (ALMA). They have star-formation rates (SFRs), stellar masses, and dust properties representative of massive main-sequence SFGs at $z \sim 2$. 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 (AGN), thereby representing a diversity of $z \sim 2$ 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 $4.2 \pm 1.8$ kpc. This provides direct evidence for galaxy-wide star formation in distant, blank-field-selected main-sequence SFGs. The typical galactic-average SFR surface density is 2.5 M$_{\odot}$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 AGN, which are found to be co-spatial 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 ($\sim300$ M$_{\odot}$yr$^{-1}$) above which a significant population of more compact star-forming galaxies appears to emerge.",

keywords = "Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics",

author = "W. Rujopakarn and Dunlop, {J. S.} and Rieke, {G. H.} and Ivison, {R. J.} and A. Cibinel and K. Nyland and P. Jagannathan and Silverman, {J. D.} and Alexander, {D. M.} and Biggs, {A. D.} and S. Bhatnagar and Ballantyne, {D. R.} and M. Dickinson and D. Elbaz and Geach, {J. E.} and Hayward, {C. C.} and A. Kirkpatrick and McLure, {R. J.} and Michalowski, {M. J.} and Miller, {N. A.} and D. Narayanan and Owen, {F. N.} and M. Pannella and C. Papovich and A. Pope and U. Rau and Robertson, {B. E.} and D. Scott and Swinbank, {A. M.} and {van der Werf}, P. and {van Kampen}, E. and Weiner, {B. J.} and Windhorst, {R. A.}",

year = "2016",

month = dec,

day = "1",

language = "English",

volume = "833",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

}

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, Michalowski, MJ, Miller, NA, Narayanan, D, Owen, FN, Pannella, M, Papovich, C, Pope, A, Rau, U, Robertson, BE, Scott, D, Swinbank, AM, van der Werf, P, van Kampen, E, Weiner, BJ & Windhorst, RA 2016, 'VLA and ALMA Imaging of Intense, Galaxy-Wide Star Formation in z ~ 2 Galaxies', Astrophysical Journal, vol. 833, no. 1. <http://adsabs.harvard.edu/abs/2016arXiv160707710R>

TY - JOUR

T1 - VLA and ALMA Imaging of Intense, Galaxy-Wide Star Formation in z ~ 2 Galaxies

AU - Rujopakarn, W.

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 - Michalowski, 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 - van der Werf, P.

AU - van Kampen, E.

AU - Weiner, B. J.

AU - Windhorst, R. A.

PY - 2016/12/1

Y1 - 2016/12/1

N2 - We present $\simeq$0$.\!\!^{\prime\prime}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 $2' \times 2'$ Hubble Ultra-Deep Field at $\lambda = 5$ cm and 1.3 mm using the Karl G. Jansky Very Large Array (VLA) and Atacama Large Millimeter/submillimeter Array (ALMA). They have star-formation rates (SFRs), stellar masses, and dust properties representative of massive main-sequence SFGs at $z \sim 2$. 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 (AGN), thereby representing a diversity of $z \sim 2$ 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 $4.2 \pm 1.8$ kpc. This provides direct evidence for galaxy-wide star formation in distant, blank-field-selected main-sequence SFGs. The typical galactic-average SFR surface density is 2.5 M$_{\odot}$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 AGN, which are found to be co-spatial 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 ($\sim300$ M$_{\odot}$yr$^{-1}$) above which a significant population of more compact star-forming galaxies appears to emerge.

AB - We present $\simeq$0$.\!\!^{\prime\prime}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 $2' \times 2'$ Hubble Ultra-Deep Field at $\lambda = 5$ cm and 1.3 mm using the Karl G. Jansky Very Large Array (VLA) and Atacama Large Millimeter/submillimeter Array (ALMA). They have star-formation rates (SFRs), stellar masses, and dust properties representative of massive main-sequence SFGs at $z \sim 2$. 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 (AGN), thereby representing a diversity of $z \sim 2$ 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 $4.2 \pm 1.8$ kpc. This provides direct evidence for galaxy-wide star formation in distant, blank-field-selected main-sequence SFGs. The typical galactic-average SFR surface density is 2.5 M$_{\odot}$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 AGN, which are found to be co-spatial 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 ($\sim300$ M$_{\odot}$yr$^{-1}$) above which a significant population of more compact star-forming galaxies appears to emerge.

KW - Astrophysics - Astrophysics of Galaxies

KW - Astrophysics - Cosmology and Nongalactic Astrophysics

M3 - Article

VL - 833

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

ER -

VLA and ALMA Imaging of Intense, Galaxy-Wide Star Formation in z ~ 2 Galaxies

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