Spectrophotometry of three high-redshift radio galaxies - 3C 6.1, 3C 265, and 3C 352

Smith, H. E.; Junkkarinen, V. T.; Spinrad, Hyron; Grueff, G.; Vigotti, M.

doi:10.1086/157194

Cited by 21 publications

(11 citation statements)

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“…This image shows a central compact galaxy, with a companion galaxy at 5 arcsec (41 kpc) to the north‐north‐west, which is also detected in infrared images (Best, Longair & Röttgering 1997) and presents colours consistent with the same redshift as 3C 265 (Best, private communication). The bright galaxy at 12 arcsec to the east of 3C 265 is a foreground elliptical galaxy at redshift z =0.392 (Smith et al 1979). There is also a faint galaxy at ∼11 arcsec (90 kpc) to the east of the nucleus, coincident with the emission‐line structures aligned along the radio axis.…”

Section: Resultsmentioning

confidence: 99%

Shocks, illumination cones and intrinsic gas structures in the extreme radio galaxy 3C 265

Solórzano-Iñarrea¹,

Tadhunter²,

Bland-Hawthorn³

2002

Monthly Notices of the Royal Astronomical Society

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We present deep, narrow‐band and continuum images of the powerful high‐redshift radio galaxy 3C 265 (z=0.811), taken with the TAURUS Tunable Filter on the William Herschel Telescope, together with detailed long‐slit spectroscopic observations along the axis defined by the UV/optical emission elongation. The deep images reveal the existence of cones in the ionization structure of 3C 265 within ∼7 arcsec (58 kpc) of the nucleus, where the emission‐line structure is not observed to be closely aligned with the radio axis. This indicates that anisotropic illumination from the central active nucleus dominates on a small scale. In contrast, at larger distances (≳10 arcsec; 80 kpc) from the nucleus, low‐ionization emission gas is closely aligned with the radio axis, suggesting that jet–cloud interactions may become the dominant mechanism in the line‐emitting gas on a larger scale. Moreover, the presence of a high‐velocity cloud at 2.5 arcsec from the nucleus, close to the radio axis, indicates that even close to the nucleus (∼20 kpc) jet‐induced shocks have an important kinematic effect. However, spectroscopic analysis of this region reveals that the ionization state of the high‐velocity gas is similar to or higher than that of the surroundings, which is opposite to what we would expect for a cloud that has been compressed and accelerated by jet‐induced shocks. Our images show that, while on a large scale the low‐ionization emission‐line structures are aligned with the radio axis, on a smaller scale, where AGN‐photoionization dominates, the highest surface‐brightness structure is aligned with the closest companion galaxy (misaligned with the radio axis). This suggest that much of the emission‐line structure reflects the intrinsic gas distribution, rather than the ionization pattern imprinted by the radio jets or by illumination from the central AGN. Overall, our results underline the need for a variety of mechanisms to explain the properties of the extended emission‐line gas in the haloes of radio galaxies.

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Section: Resultsmentioning

confidence: 99%

Shocks, illumination cones and intrinsic gas structures in the extreme radio galaxy 3C 265

Solórzano-Iñarrea¹,

Tadhunter²,

Bland-Hawthorn³

2002

Monthly Notices of the Royal Astronomical Society

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“…In this paper, we present our observations of 3C265, a V 20 powerful narrow emission line radio galaxy at z=0.81 (Kristian, Sandage & Katem 1978, Smith et al 1979, Saslaw, Tyson & Crane 1978. The major axis of the restframe UV morphology of this galaxy is o set by roughly 45 from the major axis of its radio emission (PA optical = 147 , PA E:Lobe radio = 112 , PA W:Lobe radio = 103 ).…”

Section: Introductionmentioning

confidence: 97%

“…Understanding the origin of this alignment e ect is extremely important since radio galaxies are the most often used probes of galaxy evolution and cosmology (Lilly & Longair 1984, Spinrad 1986. The recent observations of polarized continuum emission, and the possible detection of polarized broad line emission from these distant aligned galaxies provide strong support for the hypothesis that the aligned UV continua are dominated by scattered light from a hidden quasar , di Serego Alighieri et al 1989Cimatti et al 1993).…”

Section: Introductionmentioning

confidence: 99%

The Radio Galaxy 3C 265 Contains a Hidden Quasar Nucleus

Dey¹,

Spinrad

1996

ApJ

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We report the discovery of broad MgII emission from the high redshift radio galaxy 3C265 (z=0.81). We detect the broad line in the nuclear spectrum and in the spatially extended galaxian component, both near the nucleus and in the spectrum of an o -nuclear knot located 31 kpc south east of the nucleus of the galaxy. These data provide strong support for the simplest form of the uni cation hypothesis, that radio galaxies are quasars whose optical radiation is directed in the plane of the sky rather than into our line of sight. These data also strongly support the scattering model for the alignment of the UV continuum emission with the radio axis. In 3C265, if the axis of the anisotropically emitted UV continuum radiation is identi ed with the major axis of the radio source, then the observed rest frame UV continuum emission implies that the opening angle of the radiation cone is large (half angle 45 ).We also derive a mass estimate of 8 10 10 M for the central region of 3C265 from its rotation curve. The implied mass-to-light ratio is low (M/L 2), and suggests that a signi cant fraction of the rest frame UV continuum emission from this galaxy is dominated by reprocessed radiation from the buried AGN. Finally, we detect the CaII 3933 K line in absorption in the integrated spectrum of 3C265. This provides direct spectroscopic evidence for the existence of stars in a high redshift radio galaxy.

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“…are high-redshift gala.xies, including z = 0. 469 in 1975, z = 0.840 in 1979: 7 = 3.215 in 1983, and now z = 5.34 just last year (Spinrad et al 1975;Smith et al 1979;Djorgovski et al 1985Djorgovski et al , 1987. AS of this meeting, the Caltech Faint Galaxy Redshift Survey (J. G. Cohen, principal investigator) has two samples totalling N 1200 faint galaxy redshifts (median z = 0.6), selected in the R and Ii bands, in two regions of the sky (Cohen et al 199% 1999a(Cohen et al 199% , 1999b(Cohen et al 199% , 1999c.…”

Section: Introductionmentioning

confidence: 98%

“…Hy Spinrad alwa,ys hated quasars (Spinrad 1979). In those Paleolithic days (i.e., before 1987 or so) it was not yet obvious that a powerful quasar lurks in the heart of every one of Hy's beloved radio galaxies, but in some sense this does not really matter: in the work of the Spinrad School of Observational Cosmology, AGfi have been used simply as means to find stellar populations at large redshifts, in order to probe their forma.tion and evolution.…”

Section: Introductionmentioning

confidence: 99%

The Hy-Redshift Universe: Galaxy Formation and Evolution at High Redshift

Bunker¹,

Breugel²

1999

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Spectrophotometry of three high-redshift radio galaxies - 3C 6.1, 3C 265, and 3C 352

Cited by 21 publications

References 0 publications

Shocks, illumination cones and intrinsic gas structures in the extreme radio galaxy 3C 265

Shocks, illumination cones and intrinsic gas structures in the extreme radio galaxy 3C 265

The Radio Galaxy 3C 265 Contains a Hidden Quasar Nucleus

The Hy-Redshift Universe: Galaxy Formation and Evolution at High Redshift

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