FIRST-based survey of Compact Steep Spectrum sources, V. Milliarcsecond-scale morphology of CSS objects

Abstract

Multifrequency VLBA observations of the final group of ten objects in a sample of FIRST-based compact steep spectrum (CSS) sources are presented. The sample was selected to investigate whether objects of this kind could be relics of radio-loud AGNs switched off at very early stages of their evolution or possibly to indicate intermittent activity. Initial observations were made using MERLIN at 5 GHz. The sources have now been observed with the VLBA at 1.7, 5 and 8.4 GHz in a snapshot mode with phase-referencing. The resulting maps are presented along with unpublished 8.4-GHz VLA images of five sources. Some of the sources discussed here show a complex radio morphology and therefore a complicated past that, in some cases, might indicate intermittent activity. One of the sources studied - 1045+352 - is known as a powerful radio and infrared-luminous broad absorption line (BAL) quasar. It is a young CSS object whose asymmetric two-sided morphology on a scale of several hundred parsecs, extending in two different directions, may suggest intermittent activity. The young age and compact structure of 1045+352 is consistent with the evolution scenario of BAL quasars. It has also been confirmed that the submillimetre flux of 1045+352 can be seriously contaminated by synchrotron emission.

14 pages, 10 figures, matches the version appearing in Astronomy & Astrophysics

References in corpus (40)

• The u'g'r'i'z' Standard Star Network
• A Structure for Quasars
• The emission line - radio correlation for radio sources using the 7C Redshift Survey
• The Nature and Evolution of Classical Double Radio Sources from Complete Samples
• Tracing Black Hole Mergers Through Radio Lobe Morphology
• Radio galaxies with a `double-double' morphology: I - Analysis of the radio properties and evidence for interrupted activity in active galactic nuclei
• The Frequency and Radio Properties of Broad Absorption Line Quasars
• Properties of Radio-Selected Broad Absorption-Line Quasars from the FIRST Survey
• Signals from the Noise: Image Stacking for Quasars in the FIRST Survey
• Proper Motions in Compact Symmetric Objects
• Dating COINS: Kinematic Ages for Compact Symmetric Objects
• Intermittent radio galaxies and source statistics
• The FIRST Radio-Loud Broad Absorption Line QSO and Evidence for a Hidden Population of Quasars
• Jet reorientation in AGN: two winged radio galaxies
• AN IMPROVED MEASURE OF QUASAR ORIENTATION
• On the origin of X-shaped radio-sources: new insights from the properties of their host galaxies
• Extended emission around GPS radio sources
• Polar Outflows in Six Broad Absorption Line Quasars
• X-shaped radio galaxies as observational evidence for the interaction of supermassive binary black holes and accretion disk at pc scale
• Discovery of Radio-loud Broad Absorption Line Quasars Using Ultraviolet Excess and Deep Radio Selection
• A submillimetre difference between radio galaxies and radio quasars: evidence for quasar-heated dust and synchronized submillimetre and radio source activity
• Low Power Compact Radio Galaxies at High Angular Resolution
• Compact steep-spectrum sources from the S4 sample
• Broad Absorption Line Quasars in the Sloan Digital Sky Survey with VLA-FIRST Radio Detections
• Discovery of a Classic FR-II Broad Absorption Line Quasar from the FIRST Survey
• The sub-millimeter properties of broad absorption line quasars
• The B3-VLA CSS sample. II: VLBA images at 18 cm
• Jet propagation and the asymmetries of CSS radio sources
• Lobe Advance Velocities in the Extragalactic Compact Symmetric Object 4C 31.04
• Evolutive Unification in Composite Active Galactic Nuclei
• FIRST-based survey of Compact Steep Spectrum sources, IV. Multifrequency VLBA observations of very compact objects
• PKS 1004+13: A High-Inclination, Highly-Absorbed Radio-Loud QSO -- The First Radio-Loud BAL QSO at Low Redshift?
• Location of Weak CSS Sources on the Evolutionary Path of Radio-loud AGN
• FIRST-based survey of Compact Steep Spectrum sources, II. MERLIN and VLA observations of Medium-sized Symmetric Objects
• FIRST-based survey of Compact Steep Spectrum sources I. MERLIN images of arc-second scale objects
• The Twice-Overlooked, Second FR II Broad Absorption Line Quasar LBQS 1138-0126
• Resolving the Steep Spectrum Emission in the Central Radio Source in ZwCl 0735.7+7421
• FIRST-based survey of Compact Steep Spectrum sources, III. MERLIN and VLBI observations of subarcsecond-scale objects
• MAMBO 1.25mm observations of 3CR radio galaxies and quasars at z=1.5: On the debate of the unified schemes
• Submillimetre photometry of typical high-redshift radio quasars

Cited by in corpus (21)

• The Radio Properties of Radio-Loud Narrow-Line Seyfert 1 Galaxies on Parsec Scales
• Compact Symmetric Objects and Supermassive Binary Black Holes in the VLBA Imaging and Polarimetry Survey
• Radio spectra and polarisation properties of radio-loud Broad Absorption Line Quasars
• Spectral index properties of milliJansky radio sources
• Samples and statistics of CSS and GPS sources
• Origin of the complex radio structure in BAL QSO 1045+352
• The parsec-scale structure of radio-loud broad absorption line quasars
• VLBI Detections of Parsec-Scale Nonthermal Jets in Radio-Loud Broad Absorption Line Quasars
• A Chandra Survey of the X-ray Properties of Broad Absorption Line Radio-Loud Quasars
• Invisible Active Galactic Nuclei. II Radio Morphologies & Five New HI 21 cm Absorption Line Detections
• Transient C IV Broad Absorption Lines in radio detected QSOs
• Nonaxisymmetric Effects in the Black Hole Accretion Inviscid Hydrodynamics: Formation and Evolution of a Tilted Torus
• Parsec-scale properties of steep and flat spectrum extragalactic radio sources from a VLBA survey of a complete north polar cap sample
• Radio Bimodality: Spin, Accretion Mode, or Both?
• A VLBI survey of compact broad absorption line quasars with balnicity index BI>0
• A VLBI survey of compact Broad Absorption Lines (BAL) quasars with BALnicity Index BI=0
• A survey of Low Luminosity Compact sources
• X-rays from a radio-loud compact BAL Quasar 1045+352 and the nature of outflows in radio-loud BAL Quasars
• Multifrequency VLBI Observations of the Broad Absorption Line Quasar J1020+4320: Recently Restarted Jet Activity?
• Young but fading radio sources: searching for remnants among compact steep-spectrum radio sources
• Broadband nuclear emission in two radio-loud BAL quasars