Radio Galaxies at<i>z</i>= 1.1 to 3.8: Adaptive Optics Imaging and Archival<i>Hubble Space Telescope</i>Data

Steinbring, Eric; Crampton, D.; Hutchings, J. B.

doi:10.1086/339241

Cited by 13 publications

(35 citation statements)

References 52 publications

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“…Fig. 14 -This source is at z = 2.57 (Knopp & Chambers 1997) and has a star 3 south of the galaxy, complicating the photometry. The radio galaxy itself seems to be split into multiple components in the high-resolution NIR images (Steinbring et al 2002). The galaxy has polarimetric observations, that have been reported in Knopp & Chambers (1997).…”

Section: Appendix A: Systematics Appendix C: Notes On Individual Sourcesmentioning

confidence: 89%

Disentangling star formation and AGN activity in powerful infrared luminous radio galaxies at 1 <z< 4

Drouart

Rocca‐Volmerange

Breuck

et al. 2016

A&A

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High-redshift radio galaxies present signs of both star formation and AGN activity, making them ideal candidates to investigate the connection and coevolution of AGN and star formation in the progenitors of present-day massive galaxies. We make use of a sample of 11 powerful radio galaxies spanning 1 < z < 4 which have complete coverage of their spectral energy distribution (SED) from UV to FIR wavelengths. Using Herschel data, we disentangle the relative contribution of the AGN and star formation by combining the galaxy evolution code PÉGASE.3 with an AGN torus model. We find that three components are necessary to reproduce the observed SEDs: an evolved and massive stellar component, a submm bright young starburst, and an AGN torus. We find that powerful radio galaxies form at very high-redshift, but experience episodic and important growth at 1 < z < 4 as the mass of the associated starburst varies from 5 to 50% of the total mass of the system. The properties of star formation differ from source to source, indicating no general trend of the star formation properties in the most infrared luminous high-redshift radio galaxies and no correlation with the AGN bolometric luminosity. Moreover, we find that AGN scattered light have a very limited impact on broad-band SED fitting on our sample. Finally, our analysis also suggests a wide range in origins for the observed star formation,which we partially constrain for some sources.

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Section: Appendix A: Systematics Appendix C: Notes On Individual Sourcesmentioning

confidence: 89%

Disentangling star formation and AGN activity in powerful infrared luminous radio galaxies at 1 <z< 4

Drouart

Rocca‐Volmerange

Breuck

et al. 2016

A&A

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“…It is at the bright edge of the observed K-z relation (Willott et al 2003), near a galaxy mass limit of 10 12 M predicted by models (e.g., Rocca-Volmerange et al 2004). A star ideal for AO guiding is in nearby projection on the sky and was used to assist H-and K-band imaging on the Canada-France-Hawaii Telescope (CFHT; Steinbring et al 2002). Those FWHM = 0.…”

Section: Introductionmentioning

confidence: 95%

“…A disadvantage of seeing-limited studies, however, is that they lack the spatial resolution needed to study HzRG substructure on sub-kpc scales (1 ≈ 8 kpc at z = 2 for a H 0 = 70 km s −1 Mpc, Ω m = 0.3, Ω Λ = 0.7 concordance cosmology, which is adopted throughout). Both Hubble Space Telescope (HST) and ground-based adaptive-optics (AO) imaging show them to typically be a string of compact knots with separations of a few kpc, aligned with the radio axis and with colors consistent with a young stellar population (e.g., Steinbring et al 2002;Stockton et al, 2004;Zirm et al 2005). Probing the kinematics and ionization conditions on these scales could decisively find correlations between the radio core, jet, and gas outflow; integral field-units behind AO are a promising new tool.…”

Section: Introductionmentioning

confidence: 99%

“…3C 230 (z = 1.487; Hewitt & Burbidge 1991) is an excellent HzRG for such a study: it is a powerful radio source (19.2 Jy at 178 MHz; Kellermann et al 1969) and particularly bright in the near-infrared (K = 17.3; Steinbring et al 2002). It is at the bright edge of the observed K-z relation (Willott et al 2003), near a galaxy mass limit of 10 12 M predicted by models (e.g., Rocca-Volmerange et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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Radio Galaxy 3c 230 Observed With Gemini Laser Adaptive-Optics Integral-Field Spectroscopy

Steinbring¹

2011

The Astronomical Journal

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The Altair laser-guide-star adaptive optics facility combined with the near-infrared integral-field spectrometer on Gemini North have been employed to study the morphology and kinematics of 3C 230 at z = 1.5, the first such observations of a high-redshift radio galaxy. These suggest a bi-polar outflow spanning 0. 9 (∼16 kpc projected distance for a standard Λ CDM cosmology) reaching a mean relative velocity of 235 km s −1 in redshifted Hα+[N ii] and [S ii] emission. Structure is resolved to 0. 1 (0.8 kpc), which is well correlated with optical images from the Hubble Space Telescope and Very Large Array radio maps obtained at similar spatial resolution. Line diagnostics suggest that over the 10 7 yr to 10 8 yr duration of its active galactic nucleus activity, gas has been ejected into bright turbulent lobes at rates comparable to star formation, although constituting perhaps only 1% of the baryonic mass in the galaxy.

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“…Most are giant ellipticals, again especially for the optically brightest and radio loudest (Bettoni et al 2001;Pursimo et al 2002), though some of the less spectacular radio galaxies are really S0s (Veron-Cetty & Veron 2001). As you look back into the past, the radio galaxies at -3.8 might be described as giant z p 1.1 ellipticals under construction (Steinbring et al 2002).…”

Section: Big Brother Is Watching (Or At Least Radiating At) You: Actimentioning

confidence: 99%

Astrophysics in 2002

Trimble

Aschwanden

2003

PUBL ASTRON SOC PAC

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ABSTRACT. This has been the Year of the Baryon. Some low temperature ones were seen at high redshift, some high temperature ones were seen at low redshift, and some cooling ones were (probably) reheated. Astronomers saw the back of the Sun (which is also made of baryons), a possible solution to the problem of ejection of material by Type II supernovae (in which neutrinos push out baryons), the production of R Coronae Borealis stars (previously-owned baryons), and perhaps found the missing satellite galaxies (whose failing is that they have no baryons). A few questions were left unanswered for next year, and an attempt is made to discuss these as well.

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Radio Galaxies atz= 1.1 to 3.8: Adaptive Optics Imaging and ArchivalHubble Space TelescopeData

Cited by 13 publications

References 52 publications

Disentangling star formation and AGN activity in powerful infrared luminous radio galaxies at 1 <z< 4

Disentangling star formation and AGN activity in powerful infrared luminous radio galaxies at 1 <z< 4

Radio Galaxy 3c 230 Observed With Gemini Laser Adaptive-Optics Integral-Field Spectroscopy

Astrophysics in 2002

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