Properties of Host Galaxies of Powerful Radio Sources

Zirbel, Esther

doi:10.1086/178184

Cited by 64 publications

(81 citation statements)

References 38 publications

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“…For radio powers > 10 23 h −2 75 W Hz −1 at 20cm, nearly all radio sources fit into one of the two FR categories and are hosted by elliptical galaxies (or recognizable variations on ellipticals) as found by Heckman et al (1986) and Zirbel (1996, and references therein) for radio sources not selected to reside in rich cluster environments. In rich clusters the host galaxies appear to be much more homogeneous in nature, with a lower frequency of obvious merger activity (Ledlow & Owen 1995b).…”

Section: Introductionmentioning

confidence: 72%

An Unusual Radio Galaxy in Abell 428: A Large, Powerful FR I Source in a Disk‐dominated Host

Ledlow

Owen

Keel

1998

ApJ

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We report the discovery of a powerful (∼ 10 24 h −2 75 W Hz −1 at 20cm) FR I radio source in a highly flattened disk-dominated galaxy. Half of the radio flux from this source is concentrated within the host galaxy, with the remainder in a pair of nearly symmetrical lobes with total extent ∼ 200 kpc nearly perpendicular to the disk. The traditional wisdom maintains that powerful, extended radio sources are found only in ellipticals or recent merger events. We report B, R, J, and K imaging, optical spectroscopy, a rotation curve, an IRAS detection, and a VLA 20 cm image for this galaxy, 0313-192. The optical and near infrared images clearly show a disk. We detect apparent spiral arms in a deep B band exposure, and a dust-lane from a higher resolution B band image. The reddened nucleus is consistent with extinction by a similar dust-lane. The optical spectrum suggests a central AGN and some evidence of a starburst, with both the AGN and central starlight appearing substantially reddened (perhaps by the optical dust-lane). From analysis of the extended line emission in [OIII] and Hα, we derive a rotation curve consistent with an early-type, dusty spiral seen edge-on. From the IRAS detection at 60 and 100µm we find that the ratio of Far IR to radio flux places this object firmly as a radio galaxy (i.e. the radio emission is not powered by star formation). The radio structure suggests that the radio source in this galaxy is related to the same physical mechanisms present in jet-fed powerful radio sources, and that such powerful, extended sources can (albeit extremely rarely) occur in a disk-dominated host.

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Section: Introductionmentioning

confidence: 72%

An Unusual Radio Galaxy in Abell 428: A Large, Powerful FR I Source in a Disk‐dominated Host

Ledlow

Owen

Keel

1998

ApJ

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“…On the one hand, roughly half of the sample appears to be similar to those of local FR Is, which live in red massive earlytype galaxies (e.g. Zirbel 1996;Best et al 2005a;Smolčić 2009; and show weaker nuclei (e.g. Chiaberge et al 1999;Balmaverde et al 2008;) than the galaxy emission.…”

Section: Discussionmentioning

confidence: 96%

The radio-loud AGN population atz≳ 1 in the COSMOS field

Baldi¹,

Capetti²,

Chiaberge³

et al. 2014

A&A

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We select a sample of radio galaxies at high redshifts (z 1) in the COSMOS field by cross-matching optical and infrared (IR) images with the FIRST radio data. The aim of this study is to explore the high-z radio-loud (RL) active galactic nuclei (AGN) population at much lower luminosities than the classical samples of distant radio sources, which are similar to those of the local population of radio galaxies. Precisely, we extended a previous analysis focused on low-luminosity radio galaxies. The wide multiwavelength coverage provided by the COSMOS survey allows us to derive their spectral energy distributions (SEDs). We model them with our own developed technique 2SPD that includes old and young stellar populations and dust emission. When added to those previously selected, we obtain a sample of 74 RL AGN. The SED modeling returns several important quantities associated with the AGN and host properties. The resulting photometric redshifts range from z ∼ 0.7 to 3. The sample mostly includes compact radio sources but also 21 FR IIs sources; the radio power distribution of the sample covers ∼10 at 2000 Å. The UV emission is significantly correlated with both IR and radio luminosities; the former being the stronger link. However, the origin of UV and dust emission, whether it is produced by the AGN of by star formation, is still unclear. Our results show that this RL AGN population at high redshifts displays a wide variety of properties. Low-power radio galaxies, which are associated with UV-and IR-faint hosts are generally similar to red massive galaxies of the local FR Is. At the opposite side of the radio luminosity distribution, large MIR and UV excesses are observed in objects consistent with quasar-like AGN, as also proved by their high dust temperatures, which are more similar to local FR IIs.

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“…At low redshift, where high-resolution optical and nearinfrared images are now readily available, radio-loud quasars preferentially inhabit luminous, massive, early-type galaxies, whereas the hosts of radio-quiet quasars span a wider range of morphological types (e.g., McLure et al 1999 ;Hamilton, Casertano, & Turnshek 2001). Radio galaxies themselves have long been known to be predominantly giant ellipticals (e.g., Matthews, Morgan, & Schmidt 1964 ;Zirbel 1996 ;de Vries et al 2000). Within this backdrop, Seyfert galaxies, which are generally considered to be the low-luminosity extension of the quasar phenomenon, traditionally have been regarded as radio-quiet objects.…”

Section: Introductionmentioning

confidence: 99%

Nuclear Luminosities and Radio Loudness of Seyfert Nuclei

Peng

2001

ApJ

220

265

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Historically, Seyfert nuclei have been considered to be radio-quiet active galactic nuclei (AGNs). We question this widely held assumption by showing that the distribution of the radio-to-optical luminosity ratio, when properly measured for the nuclear component, places the majority of R 4 L l (6 cm)/L l (B), type 1 Seyfert nuclei in the category of radio-loud AGNs, deÐned here as objects with R º 10. This result is further strengthened by strong correlations found between radio power and optical continuum and emission-line luminosities, as has been established previously for more powerful AGNs. We also present a new calibration of the relation between optical continuum and Balmer emission-line luminosities valid in the regime of low-luminosity AGNs.

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Properties of Host Galaxies of Powerful Radio Sources

Cited by 64 publications

References 38 publications

An Unusual Radio Galaxy in Abell 428: A Large, Powerful FR I Source in a Disk‐dominated Host

An Unusual Radio Galaxy in Abell 428: A Large, Powerful FR I Source in a Disk‐dominated Host

The radio-loud AGN population atz≳ 1 in the COSMOS field

Nuclear Luminosities and Radio Loudness of Seyfert Nuclei

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