quasars: individual: SDSS J0924+0219; gravitational lensing: strong; galaxies: star formation
Abstract :
[en] We present Karl G. Jansky Very Large Array (VLA) and Atacama Large Millimetre Array (ALMA) observations of SDSS J0924+0219, a z = 1.524 radio-quiet lensed quasar with an intrinsic radio flux density of about 3 µJy. The four lensed images are clearly detected in the radio continuum and the CO(5-4) line, whose centroid is at z = 1.5254 ± 0.0001, with a marginal detection in the submillimetre continuum. The molecular gas displays ordered motion, in a structure approximately 1-2.5 kpc in physical extent, with typical velocities of 50-100 km s[SUP]-1[/SUP]. Our results are consistent with the radio emission being emitted from the same region, but not with a point source of radio emission. SDSS J0924+0219 shows an extreme anomaly in the flux ratios of the two merging images in the optical continuum and broad emission lines, suggesting the influence of microlensing by stars in the lensing galaxy. We find the flux ratio in the radio, submillimetre continuum and CO lines to be slightly greater than 1 but much less than that in the optical, which can be reproduced with a smooth galaxy mass model and an extended source. Our results, supported by a microlensing simulation, suggest that the most likely explanation for the optical flux anomaly is indeed microlensing.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Badole, Shruti; Jodrell Bank Centre for Astrophysics, Department of Physics & Astronomy, University of Manchester, Alan Turing Building, Oxford Road, Manchester M13 9PL, UK
Jackson, Neal; Jodrell Bank Centre for Astrophysics, Department of Physics & Astronomy, University of Manchester, Alan Turing Building, Oxford Road, Manchester M13 9PL, UK
Hartley, Philippa; Jodrell Bank Centre for Astrophysics, Department of Physics & Astronomy, University of Manchester, Alan Turing Building, Oxford Road, Manchester M13 9PL, UK ; Square Kilometre Array Organisation, Macclesfield, Cheshire SK11 9DL, UK
Sluse, Dominique ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Stacey, Hannah; ASTRON, Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, the Netherlands ; Kapteyn Astronomical Institute, PO Box 800, NL-9700 AV Groningen, the Netherlands ; Max Planck Institute for Astrophysics, Karl-Schwarzschild Str 1, D-85748 Garching bei München, Germany
Vives-Arias, Héctor; Instituto de Astrofísica de Canarias, Vía Láctea, s/n, E-38205 La Laguna, Tenerife, Spain ; Departmento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain)
Language :
English
Title :
VLA and ALMA observations of the lensed radio-quiet quasar SDSS J0924+0219: a molecular structure in a 3 μJy radio source
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