We report 1.7GHz very long baseline interferometry (VLBI) observations of IRAS F10214+4724, a lensed z = 2.3 obscured quasar with prodigious star formation. We detect what we argue to be the obscured active nucleus with an effective angular resolution of 1dex) and therefore distort our view of high-redshift, gravitationally lensed galaxies.Department of HE and Training approved lis

Deane, Roger P.

Garrett, M. A.

Heywood, Ian

Jarvis, Matt

Klöckner, H. R.

Marshall, P. J.

McKean, J. P.

Rawlings, S.

Monthly Notices of the Royal Astronomical Society

arXiv

We report 1.7 GHz Very Long Baseline Interferometry (VLBI) observations of IRAS F10214+4724, a lensed z = 2.3 obscured quasar with prodigious star formation. We detect what we argue to be the obscured active nucleus with an effective angular resolution of &lt; 50 pc at z = 2.3. The S 1.7 = 210 µJy (9-σ) detection of this unresolved source is located within the HST rest-frame ultraviolet/optical arc, however, &amp;100 milli-arcseconds northward of the arc centre of curvature. This leads to a source plane inversion that places the European VLBI Network detection to within milli-arcseconds of the modelled cusp caustic, resulting in a very large magnification (µ ∼70), over an order of magnitude larger than the CO (1→0) derived magnification of a spatially resolved JVLA map, using the same lens model. We esti-mate the quasar bolometric luminosity from a number of independent techniques and with our X-ray modelling find evidence that the AGN may be close to Compton-thick, with an intrin-sic bolometric luminosity log10(〈Lbol,QSO〉/L)  = 11.34 ± 0.27 dex. We make the first black hole mass estimate of IRAS F10214+4724 and find log10(MBH/M)  = 8.36±0.56 which sug-gests a low black hole accretion rate (λ = Ṁ/ṀEdd ∼ 3±72 percent). We find evidence for 

R. P. Deane

S. Rawlings

M. A. Garrett

I. Heywood

M. J. Jarvis

H. -r. Klöckner

P. J. Marshall

J. P. Mckean

CiteSeerX

The preferentially magnified active nucleus in IRAS F10214+4724 – III. VLBI observations of the radio core

University of the Western Cape Research Repository

The preferentially magnified active nucleus in IRAS F10214+4724 - III. VLBI observations of the radio core

We report 1.7 GHz Very Long Baseline Interferometry (VLBI) observations of IRAS F10214+4724, a lensed z=2.3 obscured quasar with prodigious star formation. We detect what we argue to be the obscured active nucleus with an effective angular resolution of ~100 mas northward of the arc centre of curvature. This leads to a source plane inversion that places the European VLBI Network detection to within milli-arcseconds of the modelled cusp caustic, resulting in a very large magnification (\mu ~70), over an order of magnitude larger than the CO (1-0) derived magnification of a spatially resolved JVLA map, using the same lens model. We estimate the quasar bolometric luminosity from a number of independent techniques and with our X-ray modelling find evidence that the AGN may be close to Compton-thick, with an intrinsic bolometric luminosity log(L_{bol,QSO} / L_sun) = 11.34 +- 0.27 dex. We make the first black hole mass estimate of IRAS F10214+4724 and find log(M_{BH}/M_sun) = 8.36 +- 0.56 which suggests a low black hole accretion rate (\lambda = \dot{M} / \dot{M}_{Edd} ~ 3\pm^7_2 percent). We find evidence for a M_{BH}/M_{spheroid} ratio that is 1-2 orders of magnitude larger than that of submillimetre galaxies (SMGs) at z~2. At face value, this suggests IRAS F10214+4724 has undergone a different evolutionary path compared to SMGs at the same epoch. A primary result of this work is the demonstration that emission regions of differing size and position can undergo significantly different magnification boosts (> 1 dex) and therefore distort our view of high-redshift, gravitationally lensed galaxies

Deane, RP

Rawlings, S

Garrett, MA

Heywood, I

Jarvis, MJ

Klöckner, HR

Marshall, PJ

McKean, JP

Oxford University Research Archive

The preferentially magnified active nucleus in IRAS F10214+4724 - III.
  VLBI observations of the radio core

We report 1.7 GHz Very Long Baseline Interferometry (VLBI) observations of
IRAS F10214+4724, a lensed z=2.3 obscured quasar with prodigious star
formation. We detect what we argue to be the obscured active nucleus with an
effective angular resolution of < 50 pc at z = 2.3 . The S_{1.7} = 210 micro-Jy
(9-\sigma) detection of this unresolved source is located within the HST
rest-frame ultraviolet/optical arc, however, >~100 mas northward of the arc
centre of curvature. This leads to a source plane inversion that places the
European VLBI Network detection to within milli-arcseconds of the modelled cusp
caustic, resulting in a very large magnification (\mu ~70), over an order of
magnitude larger than the CO (1-0) derived magnification of a spatially
resolved JVLA map, using the same lens model. We estimate the quasar bolometric
luminosity from a number of independent techniques and with our X-ray modelling
find evidence that the AGN may be close to Compton-thick, with an intrinsic
bolometric luminosity log(L_{bol,QSO} / L_sun) = 11.34 +- 0.27 dex. We make the
first black hole mass estimate of IRAS F10214+4724 and find log(M_{BH}/M_sun) =
8.36 +- 0.56 which suggests a low black hole accretion rate (\lambda = \dot{M}
/ \dot{M}_{Edd} ~ 3\pm^7_2 percent). We find evidence for a M_{BH}/M_{spheroid}
ratio that is 1-2 orders of magnitude larger than that of submillimetre
galaxies (SMGs) at z~2. At face value, this suggests IRAS F10214+4724 has
undergone a different evolutionary path compared to SMGs at the same epoch. A
primary result of this work is the demonstration that emission regions of
differing size and position can undergo significantly different magnification
boosts (> 1 dex) and therefore distort our view of high-redshift,
gravitationally lensed galaxies

Oxford University Research Archive (ORA)

The preferentially magnified active nucleus in IRAS F10214+4724 - III. VLBI observations of the radio core

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