The 1.4 mm Core of Centaurus A: First VLBI Results with the South Pole Telescope

Junhan Kim, Daniel P Marrone, Alan L. Roy, Jan Wagner, Keiichi Asada, Christopher Beaudoin, Jay Blanchard, John E. Carlstrom, Ming Tang Chen, Thomas M. Crawford, Geoffrey B. Crew, Sheperd S. Doeleman, Vincent L. Fish, Christopher H. Greer, Mark A. Gurwell, Jason W. Henning, Makoto Inoue, Ryan Keisler, Thomas P. Krichbaum, Ru Sen LuDirk Muders, Cornelia Müller, Chi H. Nguyen, Eduardo Ros, Jason Soohoo, Remo P.J. Tilanus, Michael Titus, Laura Vertatschitsch, Jonathan Weintroub, J. Anton Zensus

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Centaurus A (Cen A) is a bright radio source associated with the nearby galaxy NGC 5128 where high-resolution radio observations can probe the jet at scales of less than a light day. The South Pole Telescope (SPT) and the Atacama Pathfinder Experiment performed a single-baseline very-long-baseline interferometry (VLBI) observation of Cen A in 2015 January as part of VLBI receiver deployment for the SPT. We measure the correlated flux density of Cen A at a wavelength of 1.4 mm on a ∼7000 km (5 Gλ) baseline. Ascribing this correlated flux density to the core, and with the use of a contemporaneous short-baseline flux density from a Submillimeter Array observation, we infer a core brightness temperature of 1.4 ×1011 K. This is close to the equipartition brightness temperature, where the magnetic and relativistic particle energy densities are equal. Under the assumption of a circular Gaussian core component, we derive an upper limit to the core size φ = 34.0 ±1.8 μas, corresponding to 120 Schwarzschild radii for a black hole mass of 5.5 ×107 M o.

Original languageEnglish (US)
Article number129
JournalAstrophysical Journal
Volume861
Issue number2
DOIs
StatePublished - Jul 10 2018

Fingerprint

very long baseline interferometry
interferometry
poles
flux density
telescopes
brightness temperature
radio
radio observation
relativistic particles
particle energy
receivers
probe
galaxies
wavelength
radii
probes
high resolution
wavelengths
energy
experiment

Keywords

  • black hole physics
  • galaxies: active
  • galaxies: individual (Centaurus A)
  • submillimeter: general
  • techniques: high angular resolution
  • techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

The 1.4 mm Core of Centaurus A : First VLBI Results with the South Pole Telescope. / Kim, Junhan; Marrone, Daniel P; Roy, Alan L.; Wagner, Jan; Asada, Keiichi; Beaudoin, Christopher; Blanchard, Jay; Carlstrom, John E.; Chen, Ming Tang; Crawford, Thomas M.; Crew, Geoffrey B.; Doeleman, Sheperd S.; Fish, Vincent L.; Greer, Christopher H.; Gurwell, Mark A.; Henning, Jason W.; Inoue, Makoto; Keisler, Ryan; Krichbaum, Thomas P.; Lu, Ru Sen; Muders, Dirk; Müller, Cornelia; Nguyen, Chi H.; Ros, Eduardo; Soohoo, Jason; Tilanus, Remo P.J.; Titus, Michael; Vertatschitsch, Laura; Weintroub, Jonathan; Zensus, J. Anton.

In: Astrophysical Journal, Vol. 861, No. 2, 129, 10.07.2018.

Research output: Contribution to journalArticle

Kim, J, Marrone, DP, Roy, AL, Wagner, J, Asada, K, Beaudoin, C, Blanchard, J, Carlstrom, JE, Chen, MT, Crawford, TM, Crew, GB, Doeleman, SS, Fish, VL, Greer, CH, Gurwell, MA, Henning, JW, Inoue, M, Keisler, R, Krichbaum, TP, Lu, RS, Muders, D, Müller, C, Nguyen, CH, Ros, E, Soohoo, J, Tilanus, RPJ, Titus, M, Vertatschitsch, L, Weintroub, J & Zensus, JA 2018, 'The 1.4 mm Core of Centaurus A: First VLBI Results with the South Pole Telescope', Astrophysical Journal, vol. 861, no. 2, 129. https://doi.org/10.3847/1538-4357/aac7c6
Kim, Junhan ; Marrone, Daniel P ; Roy, Alan L. ; Wagner, Jan ; Asada, Keiichi ; Beaudoin, Christopher ; Blanchard, Jay ; Carlstrom, John E. ; Chen, Ming Tang ; Crawford, Thomas M. ; Crew, Geoffrey B. ; Doeleman, Sheperd S. ; Fish, Vincent L. ; Greer, Christopher H. ; Gurwell, Mark A. ; Henning, Jason W. ; Inoue, Makoto ; Keisler, Ryan ; Krichbaum, Thomas P. ; Lu, Ru Sen ; Muders, Dirk ; Müller, Cornelia ; Nguyen, Chi H. ; Ros, Eduardo ; Soohoo, Jason ; Tilanus, Remo P.J. ; Titus, Michael ; Vertatschitsch, Laura ; Weintroub, Jonathan ; Zensus, J. Anton. / The 1.4 mm Core of Centaurus A : First VLBI Results with the South Pole Telescope. In: Astrophysical Journal. 2018 ; Vol. 861, No. 2.
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abstract = "Centaurus A (Cen A) is a bright radio source associated with the nearby galaxy NGC 5128 where high-resolution radio observations can probe the jet at scales of less than a light day. The South Pole Telescope (SPT) and the Atacama Pathfinder Experiment performed a single-baseline very-long-baseline interferometry (VLBI) observation of Cen A in 2015 January as part of VLBI receiver deployment for the SPT. We measure the correlated flux density of Cen A at a wavelength of 1.4 mm on a ∼7000 km (5 Gλ) baseline. Ascribing this correlated flux density to the core, and with the use of a contemporaneous short-baseline flux density from a Submillimeter Array observation, we infer a core brightness temperature of 1.4 ×1011 K. This is close to the equipartition brightness temperature, where the magnetic and relativistic particle energy densities are equal. Under the assumption of a circular Gaussian core component, we derive an upper limit to the core size φ = 34.0 ±1.8 μas, corresponding to 120 Schwarzschild radii for a black hole mass of 5.5 ×107 M o.",
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AU - Kim, Junhan

AU - Marrone, Daniel P

AU - Roy, Alan L.

AU - Wagner, Jan

AU - Asada, Keiichi

AU - Beaudoin, Christopher

AU - Blanchard, Jay

AU - Carlstrom, John E.

AU - Chen, Ming Tang

AU - Crawford, Thomas M.

AU - Crew, Geoffrey B.

AU - Doeleman, Sheperd S.

AU - Fish, Vincent L.

AU - Greer, Christopher H.

AU - Gurwell, Mark A.

AU - Henning, Jason W.

AU - Inoue, Makoto

AU - Keisler, Ryan

AU - Krichbaum, Thomas P.

AU - Lu, Ru Sen

AU - Muders, Dirk

AU - Müller, Cornelia

AU - Nguyen, Chi H.

AU - Ros, Eduardo

AU - Soohoo, Jason

AU - Tilanus, Remo P.J.

AU - Titus, Michael

AU - Vertatschitsch, Laura

AU - Weintroub, Jonathan

AU - Zensus, J. Anton

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N2 - Centaurus A (Cen A) is a bright radio source associated with the nearby galaxy NGC 5128 where high-resolution radio observations can probe the jet at scales of less than a light day. The South Pole Telescope (SPT) and the Atacama Pathfinder Experiment performed a single-baseline very-long-baseline interferometry (VLBI) observation of Cen A in 2015 January as part of VLBI receiver deployment for the SPT. We measure the correlated flux density of Cen A at a wavelength of 1.4 mm on a ∼7000 km (5 Gλ) baseline. Ascribing this correlated flux density to the core, and with the use of a contemporaneous short-baseline flux density from a Submillimeter Array observation, we infer a core brightness temperature of 1.4 ×1011 K. This is close to the equipartition brightness temperature, where the magnetic and relativistic particle energy densities are equal. Under the assumption of a circular Gaussian core component, we derive an upper limit to the core size φ = 34.0 ±1.8 μas, corresponding to 120 Schwarzschild radii for a black hole mass of 5.5 ×107 M o.

AB - Centaurus A (Cen A) is a bright radio source associated with the nearby galaxy NGC 5128 where high-resolution radio observations can probe the jet at scales of less than a light day. The South Pole Telescope (SPT) and the Atacama Pathfinder Experiment performed a single-baseline very-long-baseline interferometry (VLBI) observation of Cen A in 2015 January as part of VLBI receiver deployment for the SPT. We measure the correlated flux density of Cen A at a wavelength of 1.4 mm on a ∼7000 km (5 Gλ) baseline. Ascribing this correlated flux density to the core, and with the use of a contemporaneous short-baseline flux density from a Submillimeter Array observation, we infer a core brightness temperature of 1.4 ×1011 K. This is close to the equipartition brightness temperature, where the magnetic and relativistic particle energy densities are equal. Under the assumption of a circular Gaussian core component, we derive an upper limit to the core size φ = 34.0 ±1.8 μas, corresponding to 120 Schwarzschild radii for a black hole mass of 5.5 ×107 M o.

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KW - galaxies: active

KW - galaxies: individual (Centaurus A)

KW - submillimeter: general

KW - techniques: high angular resolution

KW - techniques: interferometric

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