Interferometric Measurements of Variable 340 GHz Linear Polarization in Sagittarius A*

Abstract

Using the Submillimeter Array, we have made the first high angular resolution measurements of the linear polarization of Sagittarius A* at submillimeter wavelengths, and the first detection of intra-day variability in its linear polarization. We detected linear polarization at 340 GHz (880um) at several epochs. At the typical resolution of 1.4"x2.2", the expected contamination from the surrounding (partially polarized) dust emission is negligible. We found that both the polarization fraction and position angle are variable, with the polarization fraction dropping from 8.5% to 2.3% over three days. This is the first significant measurement of variability in the linear polarization fraction in this source. We also found variability in the polarization and total intensity within single nights, although the relationship between the two is not clear from these data. The simultaneous 332 and 342 GHz position angles are the same, setting a one-sigma rotation measure (RM) upper limit of 7x10^5 rad/m^2. From position angle variations and comparison of "quiescent" position angles observed here and at 230 GHz we infer that the RM is a few times 10^5 rad/m^2, a factor of a few below our direct detection limit. A generalized model of the RM produced in the accretion flow suggests that the accretion rate at small radii must be low, below 10^{-6} to 10^{-7} M_{sun}/year depending on the radial density and temperature profiles, but in all cases below the gas capture rate inferred from X-ray observations.

12 pages, 4 figures. To appear in ApJ

References in corpus (36)

• Advection-Dominated Accretion: A Self-Similar Solution
• Advection-Dominated Accretion: Underfed Black Holes and Neutron Stars
• On the Fate of Gas Accreting at a Low Rate onto a Black Hole
• SCUBA: A common-user submillimetre camera operating on the James Clerk Maxwell Telescope
• Stellar Orbits Around the Galactic Center Black Hole
• The Proper Motion of Sgr A*: II. The Mass of Sgr A*
• Chandra X-ray Spectroscopic Imaging of Sgr A* and the Central Parsec of the Galaxy
• Nonthermal Electrons in Radiatively Inefficient Accretion Flow Models of Sagittarius A*
• Near-infrared flares from accreting gas around the supermassive black hole at the Galactic Centre
• SINFONI in the Galactic Center: young stars and IR flares in the central light month
• Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre
• The Submillimeter Array
• Convection-Dominated Accretion Flows
• Stellar dynamics in the central arcsecond of our galaxy
• Interferometric Detection of Linear Polarization from Sagittarius A* at 230 GHz
• A size of ~1 AU for the radio source Sgr A* at the centre of the Milky Way
• The Nature of the 10 Kilosecond X-ray Flare in Sgr A*
• A deep submillimetre survey of the Galactic Centre
• Detection of the Intrinsic Size of Sagittarius A* through Closure Amplitude Imaging (includes Online Supporting Material)
• Constraining the Accretion Rate Onto Sagittarius A* Using Linear Polarization
• First Simultaneous NIR/X-ray Detection of a Flare from SgrA*
• Galactic Centre stellar winds and Sgr A* accretion
• A Dynamical Model for Hot Gas in the Galactic Center
• Sgr A* Polarization: No ADAF, Low Accretion Rate, and Non-Thermal Synchrotron Emission
• The Spectrum and Variability of Circular Polarization in Sagittarius A* from 1.4 to 15 GHz
• Circular Polarization of Radio Emission from Relativistic Jets
• Detection of Circular Polarization in the Galactic Center Black Hole Candidate Sagittarius A*
• Radiatively Inefficient Accretion Flow Models of Sgr A*
• Intra-day Variability of Sagittarius A* at 3 Millimeters
• Variable Linear Polarization from Sagittarius A*: Evidence for a Hot Turbulent Accretion Flow
• The Fate of Non-Radiative Magnetized Accretion Flows: Magnetically-Frustrated Convection
• Intra-Day Variation of Sagittarius A* at Short Millimeter Wavelengths
• Polarized mm And sub-mm Emission From Sgr A* At The Galactic Center
• Confirmation and Analysis of Circular Polarization from Sagittarius A*
• The Linear Polarization of Sagittarius A* II. VLA and BIMA Polarimetry at 22, 43 and 86 GHz
• BIMA Observations of Linear Polarization in Sagittarius A* at 112 GHz

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