Milliarcsecond Imaging of the Radio Emission from the Quasar with the Most Massive Black Hole at Reionization
Carilli, Chris L.
Strauss, Michael A.
AffiliationUniv Arizona, Steward Observ
quasars: individual (SDSS J010013.02+280225.8)
radio continuum: galaxies
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationMilliarcsecond Imaging of the Radio Emission from the Quasar with the Most Massive Black Hole at Reionization 2017, 835 (2):L20 The Astrophysical Journal
JournalThe Astrophysical Journal
Rights© 2017. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractWe report Very Long Baseline Array (VLBA) observations of the 1.5 GHz radio continuum emission of the z = 6.326 quasar SDSS J010013.02+ 280225.8 (hereafter J0100+ 2802). J0100+ 2802 is by far the most optically luminous and is a radio-quiet quasar with the most massive black hole known at z > 6. The VLBA observations have a synthesized beam size of 12.10 mas x5.36 mas (FWHM), and detected the radio continuum emission from this object with a peak surface brightness of 64.6 +/- 9.0 mu Jy beam(-1) and a total flux density of 88 +/- 19 mu Jy. The position of the radio peak is consistent with that from SDSS in the optical and Chandra in the X-ray. The radio source is marginally resolved by the VLBA observations. A 2D Gaussian fit to the image constrains the source size to (7.1 +/- 3.5) mas x (3.1 +/- 1.7) mas. This corresponds to a physical scale of (40 +/- 20) pc x (18 +/- 10) pc. We estimate the intrinsic brightness temperature of the VLBA source to be T-B = (1.6 +/- 1.2) x 10(7) K. This is significantly higher than the maximum value in normal star-forming galaxies, indicating an active galactic nucleus (AGN) origin for the radio continuum emission. However, it is also significantly lower than the brightness temperatures found in highest-redshift radio-loud quasars. J0100+ 2802 provides a unique example for studying the radio activity in optically luminous and radio-quiet AGNs in the early universe. Further observations at multiple radio frequencies will accurately measure the spectral index and address the dominant radiation mechanism of the radio emission.
VersionFinal published version
SponsorsVLBA project [16A-247]; National Science Foundation of China (NSFC) [11373008, 11533001]; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences [XDB09000000]; National Key Basic Research Program of China [2014CB845700]; National Key Program for Science and Technology Research and Development [2016YFA0400703]; Thousand Youth Talents Program of China; NSFC [11443002, 11473004]; NSF [AST 11-07682, 15-15115]