Relevant bibliographies by topics / Radio intermediate galaxies

Academic literature on the topic 'Radio intermediate galaxies'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Radio intermediate galaxies"

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Pierce, J. C. S., C. N. Tadhunter, and R. Morganti. "The radio properties of high-excitation radio galaxies with intermediate radio powers." Monthly Notices of the Royal Astronomical Society 494, no. 2 (February 24, 2020): 2053–67. http://dx.doi.org/10.1093/mnras/staa531.

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ABSTRACT In the past decade, high-sensitivity radio surveys have revealed that the local radio active galactic nucleus population is dominated by moderate-to-low power sources with emission that is compact on galaxy scales. High-excitation radio galaxies (HERGs) with intermediate radio powers (22.5 < log (L1.4 GHz) < 25.0 W Hz−1) form an important sub-group of this population, since there is strong evidence that they also drive multiphase outflows on the scales of galaxy bulges. Here, we present high-resolution Very Large Array observations at 1.5, 4.5, and 7.5 GHz of a sample of 16 such HERGs in the local universe (z < 0.1), conducted in order to investigate the morphology, extent, and spectra of their radio emission in detail, down to sub-kpc scales. We find that the majority (56 per cent) have unresolved structures at the limiting angular resolution of the observations (∼0.3 arcsec). Although similar in the compactness of their radio structures, these sources have steep radio spectra and host galaxy properties that distinguish them from local low-excitation radio galaxies that are unresolved on similar scales. The remaining sources exhibit extended radio structures with projected diameters ∼1.4–19.0 kpc and a variety of morphologies: three double-lobed; two large-scale diffuse; one jetted and ‘S-shaped’; one undetermined. Only 19 per cent of the sample therefore exhibit the double-lobed/edge-brightened structures often associated with their counterparts at high and low radio powers: radio-powerful HERGs and Seyfert galaxies, respectively. Additional high-resolution observations are required to investigate this further, and to probe the ≲300 pc scales on which some Seyfert galaxies show extended structures.
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Heisler, C. A., R. P. Norris, D. L. Jauncey, J. E. Reynolds, and E. A. King. "Compact Radio Emission in 60 µm Peaker Galaxies." International Astronomical Union Colloquium 164 (1998): 211–12. http://dx.doi.org/10.1017/s0252921100045255.

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AbstractWe present radio interferometric observations of a well defined sample of IRAS galaxies with warm far-infrared colors — 60 µm Peakers (60PKs). The core radio power of 60PKs is intermediate to that of “normal” Seyfert 2 galaxies and radio ellipticals, and follows the same relationship with respect to total radio emission as low and high power radio galaxies. This is consistent with the suggestion that 60PKs represent nascent radio elliptical galaxies.
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Venturi, T., W. D. Cotton, L. Feretti, G. Giovannini, L. Lara, and J. M. Marcaide. "VLBI Observations of FRI Radio Galaxies." Symposium - International Astronomical Union 175 (1996): 124–26. http://dx.doi.org/10.1017/s0074180900080281.

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The Fanaroff-Riley type I radio galaxies (Fanaroff & Riley, 1974) presented in this paper belong to the complete sample of low-intermediate luminosity radio galaxies published in Giovannini, Feretti & Comoretto (1990). This sample includes radio galaxies with different morphologies on the arcsecond scale, such as compact sources, core-halos, FRIs and FRIIs.
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Brown, M. J. I., R. L. Webster, and B. J. Boyle. "The Evolution of Radio Galaxies at Intermediate Redshift." Astronomical Journal 121, no. 5 (May 2001): 2381–91. http://dx.doi.org/10.1086/320410.

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Ronnback, J., E. van Groningen, I. Wanders, and E. Orndahl. "Host galaxies of intermediate redshift radio-loud and radio-quiet quasars." Monthly Notices of the Royal Astronomical Society 283, no. 1 (October 21, 1996): 282–96. http://dx.doi.org/10.1093/mnras/283.1.282.

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Pierce, J. C. S., C. N. Tadhunter, Y. Gordon, C. Ramos Almeida, S. L. Ellison, C. O’Dea, L. Grimmett, L. Makrygianni, P. S. Bessiere, and P. Doña Girón. "Do AGN triggering mechanisms vary with radio power? – II. The importance of mergers as a function of radio power and optical luminosity." Monthly Notices of the Royal Astronomical Society 510, no. 1 (November 10, 2021): 1163–83. http://dx.doi.org/10.1093/mnras/stab3231.

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ABSTRACT Investigation of the triggering mechanisms of radio active galactic nuclei (radio AGN) is important for improving our general understanding of galaxy evolution. In the first paper in this series, detailed morphological analysis of high-excitation radio galaxies (HERGs) with intermediate radio powers suggested that the importance of triggering via galaxy mergers and interactions increases strongly with AGN radio power and weakly with optical emission-line luminosity. Here, we use an online classification interface to expand our morphological analysis to a much larger sample of 155 active galaxies (3CR radio galaxies, radio-intermediate HERGs, and Type 2 quasars) that covers a broad range in both 1.4 GHz radio power and [O iii] λ5007 emission-line luminosity. All active galaxy samples are found to exhibit excesses in their rates of morphological disturbance relative to 378 stellar-mass- and redshift-matched non-active control galaxies classified randomly and blindly alongside them. These excesses are highest for the 3CR HERGs (4.7σ) and Type 2 quasar hosts (3.9σ), supporting the idea that galaxy mergers provide the dominant triggering mechanism for these subgroups. When the full active galaxy sample is considered, there is clear evidence to suggest that the enhancement in the rate of disturbance relative to the controls increases strongly with [O iii] λ5007 emission-line luminosity but not with 1.4 GHz radio power. Evidence that the dominant AGN host types change from early-type galaxies at high radio powers to late-type galaxies at low radio powers is also found, suggesting that triggering by secular, disc-based processes holds more importance for lower-power radio AGN.
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Pierce, J. C. S., C. N. Tadhunter, C. Ramos Almeida, P. S. Bessiere, and M. Rose. "Do AGN triggering mechanisms vary with radio power? – I. Optical morphologies of radio-intermediate HERGs." Monthly Notices of the Royal Astronomical Society 487, no. 4 (May 4, 2019): 5490–507. http://dx.doi.org/10.1093/mnras/stz1253.

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ABSTRACT Active galactic nuclei (AGNs) with intermediate radio powers are capable of driving multiphase outflows in galaxy bulges, and are also more common than their high-radio-power counterparts. In-depth characterization of the typical host galaxies and likely triggering mechanisms for this population is therefore required in order to better understand the role of radio AGN feedback in galaxy evolution. Here, we use deep optical imaging data to study the detailed host morphologies of a complete sample of 30 local radio AGNs with high-excitation optical emission (HERG) spectra and intermediate radio powers [ z < 0.1; 22.5 < log($L_{\rm 1.4GHz}$) < 24.0 W Hz-1]. The fraction of hosts with morphological signatures of mergers and interactions is greatly reduced compared to the 2Jy radio-powerful galaxies [log($L_{\rm 1.4GHz}$) > 25.0 W Hz-1] with strong optical emission lines: 53 ± 9 per cent compared with 94 ± 4 per cent. In addition, the most radio-powerful half of the sample has a higher frequency of morphological disturbance than the least radio-powerful half (67 ± 12 per cent and 40 ± 13 per cent, respectively), including the eight most highly disturbed galaxies. This suggests that the importance of triggering nuclear activity in high-excitation radio galaxies (HERGs) through mergers and interactions reduces with radio power. Both visual inspection and detailed light profile modelling reveal a mixed population of early-type and late-type morphologies, contrary to the massive elliptical galaxy hosts of radio-powerful AGNs. The prevalence of late-type hosts could suggest that triggering via secular, disc-based processes has increased importance for HERGs with lower radio powers (e.g. disc instabilities and large-scale bars).
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Gregorini, L., P. Parma, U. Klein, and K. H. Mack. "High-Frequency Study of Low and Intermediate Luminosity Radio Galaxies." Symposium - International Astronomical Union 175 (1996): 145–46. http://dx.doi.org/10.1017/s0074180900080359.

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All the information on the morphology, spectral index and polarization properties of low and intermediate luminosity radio galaxies were collected in an intermediate frequency range, and some of the basic questions to be elucidated with such measurements are still unanswered. We therefore decided to extend the study of their characteristics towards higher frequencies. From the B2 and 4C catalogue we selected 26 radio galaxies for which VLA or WSRT data are available. These sources were observed at 10.6 GHz using the Effelsberg 100-m telescope (Gregorini & al. 1992; Mack & al. 1994; Klein & al. 1995).
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Brunthaler, A., H. Falcke, G. C. Bower, M. Aller, H. Aller, and H. Teräsranta. "III Zw 2: Superluminal Motion and Compact Lobe Expansion in a Seyfert Galaxy." Symposium - International Astronomical Union 205 (2001): 110–11. http://dx.doi.org/10.1017/s0074180900220627.

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So far all relativistically boosted jets with superluminal motion have only been detected in normal radio galaxies that have early-type host galaxies. We have now discovered superluminal motion in the Seyfert 1 galaxy III Zw 2, classified as a spiral. Spectral and spatial evolution are closely linked. Since III Zw 2 is part of a sample of so-called radio-intermediate quasars (RIQ), it confirms earlier predictions of superluminal motion for this source, based on the argument that RIQs could be relativistically boosted jets in radio-weak quasars and Seyfert galaxies.
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Kuźmicz, A., B. Czerny, and C. Wildy. "Stellar populations in hosts of giant radio galaxies and their neighbouring galaxies." Astronomy & Astrophysics 624 (April 2019): A91. http://dx.doi.org/10.1051/0004-6361/201834653.

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Context. Giant radio galaxies (with projected linear size of radio structure larger than 0.7 Mpc) are very rare and unusual objects. Only ∼5% of extended radio sources reach such sizes. Understanding of the processes responsible for their large sizes is crucial to further our knowledge about the radio source’s evolution. Aims. We check the hypothesis that giants become extremely large due to the specific history of their host galaxy formation, as well as in the context of the cluster or group of galaxies where they evolve. Therefore we study the star formation histories in their host galaxies and in galaxies located in their neighbourhood. Methods. We studied 41 giant-size radio galaxies as well as galaxies located within a radius of 5 Mpc around giants to verify whether the external conditions of the intergalactic medium somehow influence the internal evolution of galaxies in the group/cluster. We compared the results with a control sample of smaller-sized Fanaroff–Riley type II radio galaxies and their neighbouring galaxies. We fit stellar continua in all galaxy spectra using the spectral synthesis code STARLIGHT and provide statistical analysis of the results. Results. We find that hosts of giant radio galaxies have a larger amount of intermediate age stellar populations compared with smaller-sized FRII radio sources. The same result is also visible when we compare neighbouring galaxies located up to 1.5 Mpc around giants and FRIIs. This may be evidence that star formation in groups with giants was triggered due to global processes occurring in the ambient intergalactic medium. These processes may also contribute to mechanisms responsible for the extremely large sizes of giants.
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Dissertations / Theses on the topic "Radio intermediate galaxies"

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Weadock, Julie Louise. "Intermediate redshift radio galaxies." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325935.

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Dickson, Robert Charles. "The optical/UV continua of intermediate redshift radio galaxies." Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264445.

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Randriamampandry, Solohery Mampionona. "Far-infrared-radio relations in clusters and groups at intermediate redshift." Thesis, University of the Western Cape, 2014. http://hdl.handle.net/11394/4221.

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Philosophiae Doctor - PhD
In this thesis, we present a multi-wavelength analysis of star-forming galaxies to shed new light on the evolution of the far-IR-radio relations in intermediate redshift (0.3 < z < 0.6) galaxy clusters and galaxy groups. The far-infrared (far-IR) emission from galaxies is dominated by thermal dust emission. The radio emission at 1.4 GHz is predominantly produced by non-thermal synchrotron radiation. The underlying mechanisms, which drive the far-IR-radio correlation, are believed to arise from massive star formation. A number of studies have investigated the relationship as a function of redshift in the field and have found no evolution out to at least z _ 2, however few works have been done in galaxy clusters. In nearby clusters, the median logarithmic ratio of the far-IR to radio luminosity is qFIR = 2.07_0.74, which is lower than the value found in the field, and there is an indication of an enhancement of radio emission relative to the far-IR emission. Understanding the properties of the far-IR-radio correlation in a sample of distant and massive cluster and groups plays an important role in understanding the physical processes in these systems. We have derived total infrared luminosities for a sample of cluster, group, and field galaxies through an empirical relation based on Spitzer MIPS 24 _m photometry. The radio flux densities were measured from deep Very Large Array 1.4 GHz radio continuum observations. We have studied the properties of the far-IR-radio correlation of galaxies at intermediate redshift clusters by comparing the relationship of these galaxies to that of low redshift clusters. We have also examined the properties of the galaxies showing radio excess to determine the extent that galaxy type or environment may explain the radio excess in galaxy clusters. We find that the ratio of far-IR to radio luminosity for galaxies in an intermediate redshift cluster to be qFIR = 1.72_0.63. This value is comparable to that measured in low redshift clusters. A higher fraction of galaxies in clusters show an excess in their radio fluxes when compared to low redshift clusters, and corroborates previous evidence of a cluster enhancement of radio excess sources at this earlier epoch as well. We have also investigated the properties of the far-IR-radio correlation for a sample of galaxy groups in the COSMOS field. We find a lower percentage of radio-excess sources in groups as compared to clusters. This provides preliminary evidence that the number of radioexcess sources may depend on galaxy environment. We also find that a larger fraction of radio-excess sources in clusters are red sequence galaxies.
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Caganoff, Saul. "Optical emission lines in radio sources of intermediate power." Phd thesis, 1989. http://hdl.handle.net/1885/138473.

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Book chapters on the topic "Radio intermediate galaxies"

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Gregorini, L., P. Parma, U. Klein, and K. H. Mack. "High-Frequency Study of Low and Intermediate Luminosity Radio Galaxies." In Extragalactic Radio Sources, 145–46. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0295-4_57.

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Zanichelli, A., R. Scaramella, M. Vigotti, G. Vettolani, and G. Grueff. "Clusters of Galaxies at Intermediate Redshifts: A Sample Selected at Radio Wavelenghts." In Extragalactic Radio Sources, 325–26. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0295-4_116.

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Örndahl, Eva, Jari Rönnback, and Ernst van Groningen. "Host Galaxies of Intermediate Redshift Radio-Loud and Radio-Quiet Quasars." In ESO Astrophysics Symposia, 217–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-540-69648-3_40.

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Sánchez, S. F., C. R. Benn, J. I. González-Serrano, and M. Vigotti. "The Host Galaxies of Intermediate and High Redshift Radio Quasars." In Highlights of Spanish Astrophysics II, 399. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-1776-2_123.

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Binney, James. "7. Galaxies." In Astrophysics: A Very Short Introduction, 115–44. Oxford University Press, 2016. http://dx.doi.org/10.1093/actrade/9780198752851.003.0007.

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‘Galaxies’ describes galaxy morphology, the chemical evolution of galaxies, and stellar dynamics. A galaxy consists of a huge number of point masses—stars and dark matter—that move freely in the gravitational field that they jointly generate. The nature of a galaxy is largely determined by its luminosity, its bulge-to-disc ratio, and the ratio of its mass of cold gas to the mass in stars. Galaxies are also shaped by their environments. Dense environments are rich in elliptical and lenticular galaxies, while abnormally under-dense environments are rich in dwarf irregular galaxies. Spiral galaxies like our own tend to inhabit regions of intermediate density.
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Conference papers on the topic "Radio intermediate galaxies"

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Randriamampandry, Solohery. "Far-infrared-radio relation in cluster galaxies at intermediate redshift." In The many facets of extragalactic radio surveys: towards new scientific challenges. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.267.0050.

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