Ultra--Steep-Spectrum Radio Sources. II. Radio, Infrared, Optical, and HST Imaging of High-Redshift 4C Objects

Chambers, K.; Miley, G. K.; Breugel, W. J. M. van; Bremer, M.; Huang, J. S.; Trentham, Neil

doi:10.1086/192338

Cited by 64 publications

(66 citation statements)

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“…High-redshift radio galaxies do not often reside in solitude, but are surrounded by overdensities of line or continuum emitters, suggesting that a significant fraction of the HzRG population may be the progenitors of the central galaxies of massive galaxy clusters (e.g., Chambers et al 1996;Le Fevre et al 1996;Kurk et al 2004a;Venemans et al 2007;Galametz et al 2012). Wylezalek et al (2013) obtained Spitzer warm-mission IRAC photometry at 3.6 μm and 4.5 μm of 200 HzRGs, including our two sources.…”

Section: Comparison Of Txs 2353-003 and Nvss J210620-214003 With Clusmentioning

confidence: 87%

“…Narrowband imaging is a standard way of identifying emissionline galaxies at high redshifts, and has been successfully used to identify over-densities of actively star-forming galaxies around high-redshift galaxies for almost two decades (e.g., Chambers et al 1996;Le Fevre et al 1996;Kurk et al 2004a;Venemans et al 2007;Hatch et al 2011;Koyama et al 2013;Hayashi et al 2012;Cooke et al 2014). Most of these observations were carried out for HzRGs at z 2, where Hα falls in the K band, which is relatively free from telluric night-sky lines.…”

Section: Hα Candidates Surrounding Txs 2353-003mentioning

confidence: 99%

“…Many are surrounded by overdensities of satellite galaxies, making them interesting tracers of overdense regions in the early Universe that may ultimately evolve into massive, rich galaxy clusters (e.g., Chambers et al 1996;Le Fevre et al 1996;Kurk et al 2004a;Venemans et al 2007;Galametz et al 2012;Wylezalek et al 2013). Their co-moving number density corresponds to that of massive clusters, when corrected for Appendix A is available in electronic form at http://www.aanda.org duty-cycle effects (Venemans et al 2007;Nesvadba et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Defying jet-gas alignment in two radio galaxies atz~ 2 with extended light profiles: Similarities to brightest cluster galaxies

Collet

Nesvadba

Breuck

et al. 2015

A&A

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We report the detection of extended warm ionized gas in two powerful high-redshift radio galaxies, NVSS J210626-314003 at z = 2.10 and TXS 2353-003 at z = 1.49, that does not appear to be associated with the radio jets. This is contrary to what would be expected from the alignment effect, a characteristic feature of distant, powerful radio galaxies at z ≥ 0.6. The gas also has smaller velocity gradients and line widths than most other high-z radio galaxies with similar data. Both galaxies are part of a systematic study of 50 high-redshift radio galaxies with SINFONI, and are the only two that are characterized by the presence of high surface-brightness gas not associated with the jet axis and by the absence of such gas aligned with the jet. Both galaxies are spatially resolved with ISAAC broadband imaging covering the rest-frame R band, and have extended wings that cannot be attributed to line contamination. We argue that the gas and stellar properties of these galaxies are more akin to gas-rich brightest cluster galaxies in cool-core clusters than the general population of high-redshift radio galaxies at z > ∼ 2. In support of this interpretation, one of our sources, TXS 2353-003, for which we have Hα narrowband imaging, is associated with an overdensity of candidate Hα emitters by a factor of ∼8 relative to the field at z = 1.5. We discuss possible scenarios of the evolutionary state of these galaxies and the nature of their emission line gas within the context of cyclical AGN feedback.

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Section: Comparison Of Txs 2353-003 and Nvss J210620-214003 With Clusmentioning

confidence: 87%

Section: Hα Candidates Surrounding Txs 2353-003mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Defying jet-gas alignment in two radio galaxies atz~ 2 with extended light profiles: Similarities to brightest cluster galaxies

Collet

Nesvadba

Breuck

et al. 2015

A&A

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“…The so-called alignment effect in radio galaxies was observed more than two decades ago, and jet-induced star formation was proposed as a possible explanation (e.g., McCarthy et al 1987;Miley et al 1992;Chambers et al 1996a;van Breugel et al 1998;Pentericci et al 1999;Zirm et al 2003). We need to be careful, however, in associating elongated UV emission with star formation because other mechanisms can produce similar clumpy structures in high-resolution observations (e.g., Fig.…”

Section: Agn-driven Star Formationmentioning

confidence: 98%

“…The magenta contours show the 4.8GHz data overlaid at 3, 5, 10, 20, 30, 50, 75, 100, 125, 150, and 200σ, with an rms = 20 µJy. Dickson et al 1995;Chambers et al 1996a;Cimatti et al 1998;van Breugel et al 1998;Pentericci et al 1999). The other likely candidates for the origin of such emission are either scattered emission from the AGN (Cimatti et al 1998) and direct nebular emission (excited either from radiative or mechanical shocks; Humphrey et al 2006;Villar-Martín et al 2007).…”

Section: Agn-driven Star Formationmentioning

confidence: 99%

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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The Co-Evolution of Galaxies and Black Holes: Current Status and Future Prospects

Heckman

2009

Astrophysics in the Next Decade

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Ultra--Steep-Spectrum Radio Sources. II. Radio, Infrared, Optical, and HST Imaging of High-Redshift 4C Objects

Cited by 64 publications

References 0 publications

Defying jet-gas alignment in two radio galaxies atz~ 2 with extended light profiles: Similarities to brightest cluster galaxies

Defying jet-gas alignment in two radio galaxies atz~ 2 with extended light profiles: Similarities to brightest cluster galaxies

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

The Co-Evolution of Galaxies and Black Holes: Current Status and Future Prospects

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