SPT0346-52: NEGLIGIBLE AGN ACTIVITY in A COMPACT, HYPER-STARBURST GALAXY at z = 5.7

Jingzhe Ma; Anthony H. Gonzalez; J. D. Vieira; M. Aravena; M. L.N. Ashby; M. Béthermin; M. S. Bothwell; W. N. Brandt; C. De Breuck; J. E. Carlstrom; S. C. Chapman; B. Gullberg; Y. Hezaveh; K. Litke; M. Malkan; D. P. Marrone; M. McDonald; E. J. Murphy; J. S. Spilker; J. Sreevani; A. A. Stark; M. Strandet; S. X. Wang

doi:10.3847/0004-637X/832/2/114

SPT0346-52: NEGLIGIBLE AGN ACTIVITY in A COMPACT, HYPER-STARBURST GALAXY at z = 5.7

Jingzhe Ma, Anthony H. Gonzalez, J. D. Vieira, M. Aravena, M. L.N. Ashby, M. Béthermin, M. S. Bothwell, W. N. Brandt, C. De Breuck, J. E. Carlstrom, S. C. Chapman, B. Gullberg, Y. Hezaveh, K. Litke, M. Malkan, D. P. Marrone, M. McDonald, E. J. Murphy, J. S. Spilker, J. SreevaniA. A. Stark, M. Strandet, S. X. Wang

Astronomy

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Abstract

We present Chandra ACIS-S and Australia Telescope Compact Array (ATCA) radio continuum observations of the strongly lensed dusty, star-forming galaxy SPT-S J034640-5204.9 (hereafter SPT0346-52) at z = 5.656. This galaxy has also been observed with ALMA, HST, Spitzer, Herschel, Atacama Pathfinder EXperiment, and the Very Large Telescope. Previous observations indicate that if the infrared (IR) emission is driven by star formation, then the inferred lensing-corrected star formation rate (SFR) (~4500 M yr^-1) and SFR surface density Σ_SFR (∼2000 M yr^-1 kpc^-2) are both exceptionally high. It remained unclear from the previous data, however, whether a central active galactic nucleus (AGN) contributes appreciably to the IR luminosity. The Chandra upper limit shows that SPT0346-52 is consistent with being star formation dominated in the X-ray, and any AGN contribution to the IR emission is negligible. The ATCA radio continuum upper limits are also consistent with the FIR-to-radio correlation for star-forming galaxies with no indication of an additional AGN contribution. The observed prodigious intrinsic IR luminosity of (3.6 ± 0.3) × 10¹³ L originates almost solely from vigorous star formation activity. With an intrinsic source size of 0.61 ±0.03 kpc, SPT0346-52 is confirmed to have one of the highest Σ_SFR of any known galaxy. This high Σ_SFR, which approaches the Eddington limit for a radiation pressure supported starburst, may be explained by a combination of very high star formation efficiency and gas fraction.

Original language	English (US)
Article number	114
Journal	Astrophysical Journal
Volume	832
Issue number	2
DOIs	https://doi.org/10.3847/0004-637X/832/2/114
State	Published - Dec 1 2016

Keywords

galaxies: high-redshift

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/0004-637X/832/2/114

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Ma, J., Gonzalez, A. H., Vieira, J. D., Aravena, M., Ashby, M. L. N., Béthermin, M., Bothwell, M. S., Brandt, W. N., Breuck, C. D., Carlstrom, J. E., Chapman, S. C., Gullberg, B., Hezaveh, Y., Litke, K., Malkan, M., Marrone, D. P., McDonald, M., Murphy, E. J., Spilker, J. S., ... Wang, S. X. (2016). SPT0346-52: NEGLIGIBLE AGN ACTIVITY in A COMPACT, HYPER-STARBURST GALAXY at z = 5.7. Astrophysical Journal, 832(2), Article 114. https://doi.org/10.3847/0004-637X/832/2/114

Ma, J, Gonzalez, AH, Vieira, JD, Aravena, M, Ashby, MLN, Béthermin, M, Bothwell, MS, Brandt, WN, Breuck, CD, Carlstrom, JE, Chapman, SC, Gullberg, B, Hezaveh, Y, Litke, K, Malkan, M, Marrone, DP, McDonald, M, Murphy, EJ, Spilker, JS, Sreevani, J, Stark, AA, Strandet, M & Wang, SX 2016, 'SPT0346-52: NEGLIGIBLE AGN ACTIVITY in A COMPACT, HYPER-STARBURST GALAXY at z = 5.7', Astrophysical Journal, vol. 832, no. 2, 114. https://doi.org/10.3847/0004-637X/832/2/114

@article{cbc994145e18499f9c2d7789d7229642,

title = "SPT0346-52: NEGLIGIBLE AGN ACTIVITY in A COMPACT, HYPER-STARBURST GALAXY at z = 5.7",

abstract = "We present Chandra ACIS-S and Australia Telescope Compact Array (ATCA) radio continuum observations of the strongly lensed dusty, star-forming galaxy SPT-S J034640-5204.9 (hereafter SPT0346-52) at z = 5.656. This galaxy has also been observed with ALMA, HST, Spitzer, Herschel, Atacama Pathfinder EXperiment, and the Very Large Telescope. Previous observations indicate that if the infrared (IR) emission is driven by star formation, then the inferred lensing-corrected star formation rate (SFR) (~4500 M yr-1) and SFR surface density ΣSFR (∼2000 M yr-1 kpc-2) are both exceptionally high. It remained unclear from the previous data, however, whether a central active galactic nucleus (AGN) contributes appreciably to the IR luminosity. The Chandra upper limit shows that SPT0346-52 is consistent with being star formation dominated in the X-ray, and any AGN contribution to the IR emission is negligible. The ATCA radio continuum upper limits are also consistent with the FIR-to-radio correlation for star-forming galaxies with no indication of an additional AGN contribution. The observed prodigious intrinsic IR luminosity of (3.6 ± 0.3) × 1013 L originates almost solely from vigorous star formation activity. With an intrinsic source size of 0.61 ±0.03 kpc, SPT0346-52 is confirmed to have one of the highest ΣSFR of any known galaxy. This high ΣSFR, which approaches the Eddington limit for a radiation pressure supported starburst, may be explained by a combination of very high star formation efficiency and gas fraction.",

keywords = "galaxies: high-redshift",

author = "Jingzhe Ma and Gonzalez, {Anthony H.} and Vieira, {J. D.} and M. Aravena and Ashby, {M. L.N.} and M. B{\'e}thermin and Bothwell, {M. S.} and Brandt, {W. N.} and Breuck, {C. De} and Carlstrom, {J. E.} and Chapman, {S. C.} and B. Gullberg and Y. Hezaveh and K. Litke and M. Malkan and Marrone, {D. P.} and M. McDonald and Murphy, {E. J.} and Spilker, {J. S.} and J. Sreevani and Stark, {A. A.} and M. Strandet and Wang, {S. X.}",

year = "2016",

month = dec,

day = "1",

doi = "10.3847/0004-637X/832/2/114",

language = "English (US)",

volume = "832",

journal = "Astrophysical Journal",

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publisher = "American Astronomical Society",

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TY - JOUR

T1 - SPT0346-52

T2 - NEGLIGIBLE AGN ACTIVITY in A COMPACT, HYPER-STARBURST GALAXY at z = 5.7

AU - Ma, Jingzhe

AU - Gonzalez, Anthony H.

AU - Vieira, J. D.

AU - Aravena, M.

AU - Ashby, M. L.N.

AU - Béthermin, M.

AU - Bothwell, M. S.

AU - Brandt, W. N.

AU - Breuck, C. De

AU - Carlstrom, J. E.

AU - Chapman, S. C.

AU - Gullberg, B.

AU - Hezaveh, Y.

AU - Litke, K.

AU - Malkan, M.

AU - Marrone, D. P.

AU - McDonald, M.

AU - Murphy, E. J.

AU - Spilker, J. S.

AU - Sreevani, J.

AU - Stark, A. A.

AU - Strandet, M.

AU - Wang, S. X.

PY - 2016/12/1

Y1 - 2016/12/1

N2 - We present Chandra ACIS-S and Australia Telescope Compact Array (ATCA) radio continuum observations of the strongly lensed dusty, star-forming galaxy SPT-S J034640-5204.9 (hereafter SPT0346-52) at z = 5.656. This galaxy has also been observed with ALMA, HST, Spitzer, Herschel, Atacama Pathfinder EXperiment, and the Very Large Telescope. Previous observations indicate that if the infrared (IR) emission is driven by star formation, then the inferred lensing-corrected star formation rate (SFR) (~4500 M yr-1) and SFR surface density ΣSFR (∼2000 M yr-1 kpc-2) are both exceptionally high. It remained unclear from the previous data, however, whether a central active galactic nucleus (AGN) contributes appreciably to the IR luminosity. The Chandra upper limit shows that SPT0346-52 is consistent with being star formation dominated in the X-ray, and any AGN contribution to the IR emission is negligible. The ATCA radio continuum upper limits are also consistent with the FIR-to-radio correlation for star-forming galaxies with no indication of an additional AGN contribution. The observed prodigious intrinsic IR luminosity of (3.6 ± 0.3) × 1013 L originates almost solely from vigorous star formation activity. With an intrinsic source size of 0.61 ±0.03 kpc, SPT0346-52 is confirmed to have one of the highest ΣSFR of any known galaxy. This high ΣSFR, which approaches the Eddington limit for a radiation pressure supported starburst, may be explained by a combination of very high star formation efficiency and gas fraction.

AB - We present Chandra ACIS-S and Australia Telescope Compact Array (ATCA) radio continuum observations of the strongly lensed dusty, star-forming galaxy SPT-S J034640-5204.9 (hereafter SPT0346-52) at z = 5.656. This galaxy has also been observed with ALMA, HST, Spitzer, Herschel, Atacama Pathfinder EXperiment, and the Very Large Telescope. Previous observations indicate that if the infrared (IR) emission is driven by star formation, then the inferred lensing-corrected star formation rate (SFR) (~4500 M yr-1) and SFR surface density ΣSFR (∼2000 M yr-1 kpc-2) are both exceptionally high. It remained unclear from the previous data, however, whether a central active galactic nucleus (AGN) contributes appreciably to the IR luminosity. The Chandra upper limit shows that SPT0346-52 is consistent with being star formation dominated in the X-ray, and any AGN contribution to the IR emission is negligible. The ATCA radio continuum upper limits are also consistent with the FIR-to-radio correlation for star-forming galaxies with no indication of an additional AGN contribution. The observed prodigious intrinsic IR luminosity of (3.6 ± 0.3) × 1013 L originates almost solely from vigorous star formation activity. With an intrinsic source size of 0.61 ±0.03 kpc, SPT0346-52 is confirmed to have one of the highest ΣSFR of any known galaxy. This high ΣSFR, which approaches the Eddington limit for a radiation pressure supported starburst, may be explained by a combination of very high star formation efficiency and gas fraction.

KW - galaxies: high-redshift

UR - http://www.scopus.com/inward/record.url?scp=85003881169&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85003881169&partnerID=8YFLogxK

U2 - 10.3847/0004-637X/832/2/114

DO - 10.3847/0004-637X/832/2/114

M3 - Article

AN - SCOPUS:85003881169

SN - 0004-637X

VL - 832

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 114

ER -

SPT0346-52: NEGLIGIBLE AGN ACTIVITY in A COMPACT, HYPER-STARBURST GALAXY at z = 5.7

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