The unusual near-infrared morphology of the radio-loud quasar 4C + 09.17

Armus, L.; Neugebauer, G.; Lehnert, M. D.; Matthews, K.

doi:10.1093/mnras/289.3.621

Monthly Notices of the Royal Astronomical Society

1997

DOI: 10.1093/mnras/289.3.621

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The unusual near-infrared morphology of the radio-loud quasar 4C + 09.17

L. Armus

G. Neugebauer

M. D. Lehnert³

et al.

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Cited by 4 publications

References 14 publications

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The [Oiii] Emission‐Line Nebula of thez= 3.594 Radio Galaxy 4C +19.71

Armus

Soifer

Murphy

et al. 1998

ApJ

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We have imaged the z = 3.594 radio galaxy 4C +19.71 in the light of the redshifted [OIII] 5007Å emission line, using a narrow-band filter centered at 2.3µm with the Near Infrared Camera on the Keck Telescope. The [OIII] nebula of 4C +19.71 has a size of 74 × 9 kpc, and a luminosity of L 5007 ∼ 3 × 10 37 W. The rest frame equivalent width of the 5007Å line, averaged over the entire nebula, is 560Å. The length of the major axis of the [OIII] emission is nearly identical to the separation of the radio lobes seen at 1465 MHz , and the position angle of the nebula is the same as that of the two radio lobes. In addition, 4C +19.71 follows the optical emission line vs. radio power correlation seen in other powerful radio galaxies. The[OIII] and Lyα emission-line luminosities suggest that the ionized gas mass lies in the range of 2 × 10 8 − 10 9 M ⊙ . The O/H ratio in the nebula is at least a few tenths solar, and may be as high as a factor of three above solar, indicating a previous phase of star formation in 4C +19.71. Thirty five percent of the total K-band flux is contributed by the 5007Å emission line, and the continuum of 4C +19.71 has a K∼ 19.6 mag. This places 4C +19.71 along the K-z relation found for other radio galaxies and radio loud quasars. If the continuum is dominated by starlight, the host galaxy has a rest frame visual luminosity of about 40L * . There are no candidate emission-line objects at the redshift of 4C +19.71 having [OIII] rest frame equivalent widths of more than about 2% that of the radio galaxy itself within a volume of 212 Mpc 3 .

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The [Oiii] Emission‐Line Nebula of thez= 3.594 Radio Galaxy 4C +19.71

Armus

Soifer

Murphy

et al. 1998

ApJ

Self Cite

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HUBBLE SPACE TELESCOPE Imaging of the Host Galaxies of High‐Redshift Radio‐loud Quasars

Lehnert¹,

Breugel²,

Heckman³

et al. 1999

ASTROPHYS J SUPPL S

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Cold mode gas accretion on two galaxy groups at z ∼ 2

Vayner

Zakamska

Sabhlok

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We present Keck Cosmic Web Imager (KCWI) integral field spectroscopy (IFS) observations of rest-frame UV emission lines $\rm Ly\alpha$, CIVλλ 1548 Å, 1550Å and $\rm HeII$ 1640 Å observed in the circumgalactic medium (CGM) of two z = 2 radio-loud quasar host galaxies. We detect extended emission on 80-90 kpc scale in $\rm Ly\alpha$ in both systems with CIV and $\rm HeII$ emission also detected out to 30-50 kpc. All emission lines show kinematics with a blue and redshifted gradient pattern consistent with velocities seen in massive dark matter halos and similar to kinematic patterns of inflowing gas seen in hydrodynamical simulations. Using the kinematics of both resolved $\rm Ly\alpha$ emission and absorption, we can confirm that both kinematic structures are associated with accretion. Combining the KCWI data with molecular gas observations with Atacama Large Millimeter/submillimeter Array (ALMA) and high spatial resolution of ionized gas with Keck OSIRIS, we find that both quasar host galaxies reside in proto-group environments at z = 2. We estimate 1 − 6 × 1010M⊙ of warm-ionized gas within 30-50 kpc from the quasar that is likely accreting onto the galaxy group. We estimate inflow rates of 60-200 M⊙ yr−1, within an order of magnitude of the outflow rates in these systems. In the 4C 09.17 system, we detect narrow gas streams associated with satellite galaxies, potentially reminiscent of ram-pressure stripping seen in local galaxy groups and clusters. We find that the quasar host galaxies reside in dynamically complex environments, with ongoing mergers, gas accretion, ISM stripping, and outflows likely playing an important role in shaping the assembly and evolution of massive galaxies at cosmic noon.

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The unusual near-infrared morphology of the radio-loud quasar 4C + 09.17

Cited by 4 publications

References 14 publications

The [Oiii] Emission‐Line Nebula of thez= 3.594 Radio Galaxy 4C +19.71

The [Oiii] Emission‐Line Nebula of thez= 3.594 Radio Galaxy 4C +19.71

HUBBLE SPACE TELESCOPE Imaging of the Host Galaxies of High‐Redshift Radio‐loud Quasars

Cold mode gas accretion on two galaxy groups at z ∼ 2

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