Browsing by Title

Now showing items 18102-18121 of 24177

    • Radio continuum and far-infrared observations of low surface brightness galaxies 

      Hoeppe, G.; Brinks, E.; Klein, U.; Giovanardi, C.; Altschuler, D.R.; Price, R.M.; Deeg, H-J. (1994)
      We present Very Large Array (VLA) radio continuum and Infrared Astronomy Satellite (IRAS) far-infrared (FIR) observations of 16 low luminosity galaxies of mostly low surface brightness. All galaxies had previously claimed ...

    • Radio continuum and molecular line observations of four bright-rimmed clouds 

      Urquhart, J.S.; Thompson, M.A.; Morgan, L.K.; White, G.J. (2006)

    • Radio Continuum Emission as a Star Formation Tracer: Bridging the Spatial Scales 

      Westcott, Jonathan (2019-01-07)
      Radio continuum emission has been demonstrated to be an excellent tracer of recent star formation, yet current understanding remains empirical, and is primarily based upon integrated multi–frequency or resolved mono–chromatic ...

    • A Radio Continuum Study of Dwarf Galaxies : 6 cm imaging of Little Things 

      Hindson, Luke; Kitchener, Ged; Brinks, Elias; Heesen, Volker; Westcott, Jonathan; Hunter, Deidre; Zhang, Hong-Xin; Rupen, Michael; Rau, Urvashi (2018-02-01)
      In this paper, we examine to what extent the radio continuum can be used as an extinction-free probe of star formation in dwarf galaxies. To that aim, we observe 40 nearby dwarf galaxies with the Very Large Array at 6 cm ...

    • The Radio Continuum-Star Formation Rate Relation in WSRT SINGS Galaxies 

      Heesen, V.; Brinks, E.; Leroy, A.K.; Heald, G.; Braun, R.; Bigiel, F.; Beck, R. (2014-04-02)
      We present a study of the spatially resolved radio continuum–star formation rate (RC–SFR) relation using stateof-the-art star formation tracers in a sample of 17 THINGS galaxies. We use SFR surface density (ΣSFR) maps ...

    • The radio flaring behaviour of GRO J1655-40: an analogy with extragalactic radio sources 

      Stevens, J. A.; Hannikainen, D.C.; Wu, K.; Hunstead, R.W.; McKay, D.J. (2003-06)

    • Radio galaxies and feedback from AGN jets 

      Hardcastle, M. J.; Croston, J. H. (2020-07-31)
      We review current understanding of the population of radio galaxies and radio-loud quasars from an observational perspective, focusing on their large-scale structures and dynamics. We discuss the physical conditions in ...

    • Radio Galaxy Physics at Low Frequencies: Lobes, Jets and Environments 

      Hardcastle, M.J. (Astronomical Society of the Pacific, 2009)
      I discuss the key role of low-frequency observations in determining the physical properties of radio galaxies and radio-loud quasars, and their application in studies of the interaction between radio sources and their ...

    • Radio Galaxy Zoo : host galaxies and radio morphologies derived from visual inspection 

      Banfield, J. K.; Wong, O. I.; Willett, K. W.; Norris, R. P.; Rudnick, L.; Shabala, S. S.; Simmons, B. D.; Snyder, C.; Garon, A.; Seymour, N.; Middelberg, E.; Andernach, H.; Lintott, C. J.; Jacob, K.; Kapinska, A. D.; Mao, M. Y.; Masters, K. L.; Jarvis, M. J.; Schawinski, K.; Paget, E.; Simpson, R.; Klockner, H. R.; Bamford, S.; Burchell, T.; Chow, K. E.; Cotter, G.; Fortson, L.; Heywood, I.; Jones, T. W.; Kaviraj, S.; Lopez-Sanchez, A. R.; Maksym, W. P.; Polsterer, K.; Borden, K.; Hollow, R. P.; Whyte, L. (2015-11-01)
      We present results from the first twelve months of operation of Radio Galaxy Zoo, which upon completion will enable visual inspection of over 170,000 radio sources to determine the host galaxy of the radio emission and the ...

    • Radio galaxy zoo EMU: towards a semantic radio galaxy morphology taxonomy 

      Bowles, Micah; Tang, Hongming; Vardoulaki, Eleni; Alexander, Emma L.; Luo, Yan; Rudnick, Lawrence; Walmsley, Mike; Porter, Fiona; Scaife, Anna M.~M.; Slijepcevic, Inigo Val; Adams, Elizabeth A.~K.; Drabent, Alexander; Dugdale, Thomas; Gürkan, Gülay; Hopkins, Andrew M.; Jimenez-Andrade, Eric F.; Leahy, Denis A.; Norris, Ray P.; Rahman, Syed Faisal ur; Ouyang, Xichang; Segal, Gary; Shabala, Stanislav S.; Wong, O. Ivy (2023-04-11)
      We present a novel natural language processing (NLP) approach to deriving plain English descriptors for science cases otherwise restricted by obfuscating technical terminology. We address the limitations of common radio ...

    • Radio Galaxy Zoo: discovery of a poor cluster through a giant wide-angle tail radio galaxy 

      Banfield, J. K.; Andernach, H.; Kapinska, A. D.; Rudnick, L.; Hardcastle, M. J.; Cotter, G.; Vaughan, S.; Jones, T. W.; Heywood, I.; Wing, J. D.; Wong, O. I.; Matorny, T.; Terentev, I. A.; Lopez-Sanchez, A. R.; Norris, R. P.; Seymour, N.; Shabala, S. S.; Willett, K. W. (2016-08-11)
      We have discovered a previously unreported poor cluster of galaxies (RGZ-CL J0823.2+0333) through an unusual giant wide-angle tail radio galaxy found in the Radio Galaxy Zoo project. We obtained a spectroscopic redshift ...

    • Radio jets and galaxies as cosmic string probes 

      Feng, Fabo (2012-08-01)

    • Radio jets in NGC 4151 where eMERLIN meets HST 

      Williams, D. R. A.; McHardy, I. M.; Baldi, R. D.; Beswick, R. J.; Argo, M. K.; Dullo, B. T.; Knapen, J. H.; Brinks, E.; Fenech, D. M.; Mundell, C.G.; Muxlow, T.W.B.; Panessa, F.; Rampadarath, H.; Westcott, J. (2017-12-21)
      We present high-sensitivity eMERLIN radio images of the Seyfert galaxy NGC 4151 at 1.5 GHz. We compare the new eMERLIN images to those from archival MERLIN observations in 1993 to determine the change in jet morphology in ...

    • Radio Measurements of the stellar proper motions in the core of the Orion Nebula Cluster 

      Dzib, Sergio A.; Loinard, Laurent; Rodríguez, Luis F.; Gómez, Laura; Forbrich, Jan; Menten, Karl M.; Kounkel, Marina A.; Mioduszewski, Amy J.; Hartmann, Lee; Tobin, John J.; Rivera, Juana L. (2017-01-10)
      Using multi-epoch VLA observations, covering a time baseline of 29.1 years, we have measured the proper motions of 88 young stars with compact radio emission in the core of the Orion Nebula Cluster (ONC) and the neighboring ...

    • Radio monitoring of the periodically variable IR source LRLL 54361: No direct correlation between the radio and IR emissions 

      Forbrich, Jan; Rodríguez, Luis F.; Palau, Aina; Zapata, Luis A.; Muzerolle, James; Gutermuth, Robert A. (2015-11-12)
      LRLL 54361 is an infrared source located in the star forming region IC 348 SW. Remarkably, its infrared luminosity increases by a factor of 10 during roughly one week every 25.34 days. To understand the origin of these ...

    • Radio source-component association for the LOFAR Two-metre Sky Survey with region-based convolutional neural networks 

      Mostert, Rafaël I. J.; Duncan, Kenneth J.; Alegre, Lara; Röttgering, Huub J. A.; Williams, Wendy L.; Best, Philip N.; Hardcastle, Martin J.; Morganti, Raffaella (2022-12-01)
      Radio loud active galactic nuclei (RLAGNs) are often morphologically complex objects that can consist of multiple, spatially separated, components. Astronomers often rely on visual inspection to resolve radio component ...

    • Radio spectra of bright compact sources at z>4.5 

      Coppejans, Rocco; Velzen, Sjoert van; Intema, Huib T.; Müller, Cornelia; Frey, Sándor; Coppejans, Deanne L.; Cseh, Dávid; Williams, Wendy; Falcke, Heino; Körding, Elmar G.; Orrú, Emanuela; Paragi, Zsolt; Gabányi, Krisztina É. (2017-05-01)
      High-redshift quasars are important to study galaxy and active galactic nuclei (AGN) evolution, test cosmological models, and study supermassive black hole growth. Optical searches for high-redshift sources have been very ...

    • The radio spectral energy distribution of infrared-faint radio sources 

      Herzog, A.; Norris, R. P.; Middelberg, E.; Seymour, N.; Spitler, L. R.; Emonts, B. H. C.; Franzen, T. M. O.; Hunstead, R.; Intema, H. T.; Marvil, J.; Parker, Q. A.; Sirothia, S. K.; Hurley-Walker, N.; Bell, M.; Bernardi, G.; Bowman, J. D.; Briggs, F.; Cappallo, R. J.; Callingham, J. R.; Deshpande, A. A.; Dwarakanath, K. S.; For, B. -Q.; Greenhill, L. J.; Hancock, P.; Hazelton, B. J.; Hindson, L.; Johnston-Hollitt, M.; Kapinska, A. D.; Kaplan, D. L.; Lenc, E.; Lonsdale, C. J.; McKinley, B.; McWhirter, S. R.; Mitchell, D. A.; Morales, M. F.; Morgan, E.; Morgan, J.; Oberoi, D.; Offringa, A.; Ord, S. M.; Prabu, T.; Procopio, P.; Shankar, N. Udaya; Srivani, K. S.; Staveley-Smith, L.; Subrahmanyan, R.; Tingay, S. J.; Wayth, R. B.; Webster, R. L.; Williams, A.; Williams, C. L.; Wu, C.; Zheng, Q.; Chippendale, A. P.; Harvey-Smith, L.; Heywood, I.; Indermuehle, B.; Popping, A.; Sault, R. J.; Whiting, M. T. (2016-09-01)
      Infrared-faint radio sources (IFRS) are a class of radio-loud (RL) active galactic nuclei (AGN) at high redshifts (z > 1.7) that are characterised by their relative infrared faintness, resulting in enormous radio-to-infrared ...

    • Radio spectral properties and jet duty cycle in the restarted radio galaxy 3C388 

      Brienza, M.; Morganti, R.; Harwood, J.; Duchet, T.; Rajpurohit, K.; Shulevski, A.; Hardcastle, M. J.; Mahatma, V.; Godfrey, L. E. H.; Prandoni, I.; Shimwell, T. W.; Intema, H. (2020-06-05)
      Context. Restarted radio galaxies represent a unique tool for investigating the duty cycle of the jet activity in active galactic nuclei (AGN). The radio galaxy 3C388 has long been claimed to be a peculiar example of an ...

    • Radio Surveys of Star Formation in the Milky Way with the Next Generation of Interferometers 

      Mutale, Mubela (2023-02-03)
      This thesis embodies work that contributes towards building our knowledge on the birth of massive stars. It presents three projects that study young HII regions which, being a direct product of the birth of massive stars, ...