We present the first results from the Complete Optical and Radio Absorption Line System (CORALS) survey for Damped Lyman Alpha (DLA) systems based on a radio-selected sample of quasars. We find that the number density and neutral gas content of CORALS DLAs is in good agreement with previous surveys. These results ...

The stronger resonant X-ray lines from the intracluster gas should be observable as absorption lines

The conference presents papers on low-luminosity active galactic nuclei, the narrow line region and associated radio emission in active galactic nuclei, observations of broad emission-line regions, the theory of emission-line regions in active galactic nuclei and the structure and dynamics of the broad line region. Also considered are active galaxies ...

Provides background information on radio galaxies. Topic areas addressed include: what produces the radio emission; radio telescopes; locating radio galaxies; how distances to radio galaxies are found; physics of ...

Topics discussed include the theory of coronal heating mechanisms, absorption lines in the spectra of quasars, abudances in stellar populations and the interstellar medium in galaxies, and the present status of dynamo theory. Also considered are accretion disks in astrophysics, the extragalactic distance scale, compact ...

We investigate the 21 cm absorption lines produced by non-linear structures during the early stage of reionization, i.e. the starless minihaloes and the dwarf galaxies. After a detailed modelling of their properties, with particular attention to the coupling physics, we determine their 21 cm absorption ...

New photographic and spectroscopic observations have been made of the nearby radio galaxy NGC 5128 with the CTIO 4 m telescope. A deep blue photograph shows some faint streamers in the NW quadrant, several arc minutes from the nucleus. No indication of a concentration of globular clusters associated with the galaxy is seen in this ...

There is a variety of optical evidence for some unification of different types of active galactic nuclei and quasi-stellar objects (QSOs). The case is very strong for the unification of at least some Seyfert galaxies, where polarization data show that the type assigned to the Seyfert galaxy must depend on viewing direction. It has been proposed that ...

We present unambiguous evidence for a parsec scale wind in the broad-line radio galaxy 3C 382, the first radio-loud active galactic nucleus, with R L = log10(f 5 GHz/f 4400)>1, whereby an outflow has been measured with X-ray grating spectroscopy. A 118 ks Chandra grating (HETG) observation of 3C 382 has revealed the presence of ...

Two topics are discussed here. The first is an observational study on molecular abundance in nearby (< 10 Mpc) gas-rich galaxies based on our ammonia survey and on data in literature. As a result, a systematically peculiar molecular abundance was found in a famous starburst galaxy M 82 regarding the formation mechanisms of molecules. We discussed ...

The chemical evolution of the high redshift intergalactic and interstellar media of galaxies is studied using QSO absorption lines. The redshift evolution of damped Lyman alpha (DLA) system metallicity is studied down to z=0.5, and no significant increase in metals is found. The CIV/HI ratio in the Lyman alpha forest is investigated at ...

The quasar 3C 191 is reexamined in the light of recent rotation measure (RM) observations by Kronberg et al. (1990) and recent He II emission data, and an updated model for the intrinsic formation of the narrow shell of this object is developed. It is argued that the extraordinarily high rotation measure in the jet of this quasar is produced by an intrinsic absorption ...

The work in this thesis involves detailed multi-frequency radio continuum (from 325 MHz to 15 GHz) and HI spectroscopic studies of a few representative nearby galaxies which are experiencing gas-loss from their disks due to different physical processes. These processes are starburst-driven galactic wind or superwind outflow (NGC1482, NGC6764), active ...

Nearby dwarf galaxies offer an unique opportunity to study the multiphase ISM at high resolution. Of special interest are those galaxies which exhibit starburst activity, as they may represent nearby analogs to the star-forming galaxies seen in large numbers at higher redshifts. These objects display a complicated interplay of ISM ...

New observations confirm that the 26.13-MHz absorption line previously detected in the direction toward the radio source Cas A represents a carbon recombination line, not a hyperfine-structure nitrogen line. Some relevant implications are discussed.

Context. Accurate distances are necessary for determining the physical properties of massive star-formation regions and the structure of our Galaxy. One way to approach these studies is by determining the kinematic distances of H ii regions. Aims: This study determines the kinematic distances of H ii regions located in the inner Galaxy and studies their ...

We report the soft X-ray spectrum of BL Lac object AO 0235+164, observed with the Einstein Observatory Imaging Proportional Counter (IPC). This object (z = 0.94) has an intervening galaxy (or a protogalactic disk) at z = 0.524 present in the line of sight, producing both radio and optical absorption lines in the ...

The gravitational lens system CLASS B2108+213 has two radio-loud lensed images separated by 4.56 arcsec. The relatively large image separation implies that the lensing is caused by a group of galaxies. In this paper, new optical imaging and spectroscopic data for the lensing galaxies of B2108+213 and the surrounding field ...

... Accession Number : AD0679650. Title : RADIO SOURCES AND ELLIPTICAL GALAXIES. Corporate Author : CALIFORNIA ...

The possibility is considered, and shown to be plausible, that the strong C IV and Si IV absorption lines in low-resolution ultraviolet spectra of gas-rich dwarf galaxies are primarily interstellar, not stellar as has been supposed. The argument is based on analogies with H II regions in the Local Group, on low-resolution equivalent ...

The presence of high-z quasars and radio galaxies indicates that galaxy formation began at z greater

... Title : EXPLOSIONS IN GALAXIES AND QUASARS,. ... Abstract : The paper discusses the mechanism of explosions in radio galaxies and quasars. ...

The broad-line radio galaxy Arp 102B is the prototypical active galaxy with double-peaked optical emission lines. In the course of studying its ultraviolet spectrum obtained with the Hubble Space Telescope, we stumbled upon a system of narrow, slightly blueshifted, metastable Fe II absorption ...

The only unbiased molecular line survey of an extragalactic source published so far is the 2 mm survey toward NGC 253 (Martin et al. 2006). Here we propose to measure the nearby FR I radio galaxy Cen A with the MOPRA/MOPS system in the 3-4 mm wavelength range (79-115 GHz) and at K-band (20-28 GHz). This will elucidate chemistry, excitation and kinetic ...

With 40 ks of Clzandra ACIS-S3 exposure, new information on both the starburst and QSO components of

We present the results of a uniform and systematic search for blueshifted Fe K absorption lines in the X-ray spectra of five bright broad-line radio galaxies observed with Suzaku. We detect, for the first time in radio-loud active galactic nuclei (AGNs) at X-rays, several ...

... of the galaxy. (Author). Descriptors : (*INTERSTELLAR MATTER, HYDROGEN), (*EXTRATERRESTRIAL RADIO WAVES, GALAXIES), RADIO ...

We have analyzed the properties of the Na D doublet lines at ??5890, 5896 � in a large sample of 691 radio galaxies using the Sloan Digital Sky Survey (SDSS). These radio galaxies are resolved in the FIRST survey, have redshifts less that 0.2 and radio flux densities at 1.4 GHz higher than 40 ...

Aims: The identities of the main processes triggering and quenching star-formation in galaxies remain unclear. A key stage in evolution, however, appears to be represented by post-starburst galaxies. To investigate the prevalence of these galaxies and their impact on galaxy evolution in general, we initiated a ...

We report on atomic gas (H I) and molecular gas (as traced by CO(2-1)) redshifted absorption features toward the nuclear regions of the closest powerful radio galaxy, Centaurus A (NGC 5128). Our H I observations using the Very Long Baseline Array allow us to discern with unprecedented sub-parsec resolution H I absorption profiles toward different positions ...

There is a variety of optical evidence for some unification of different types of active galactic nuclei and quasi-stellar objects (QSOs). The case is very strong for the unification of at least some Seyfert galaxies, where polarization data show that the type assigned to the Seyfert galaxy must depend on viewing direction. It has been proposed that ...

We present UV spectra of a small sample of high redshift active galaxies: the hyperluminous, gravitationally lensed system SMM J02399-0136 (z=2.8) and three powerful radio galaxies (z ~ 2.5). Extended continuum and emission lines are detected in all objects. The three radio galaxies present ...

Radio continuum spectra are presented for 15 Broad Absorption Line Quasars (BALQs), obtained with the VLA and typically covering four frequencies in the observed range 1.5 to 14.9 GHz. We find the radio spectral shapes of BALQs to be heterogeneous and similar to the shapes found in a general sample of 39 ...

Radio outflows of active galactic nuclei (AGNs) are invoked in cosmological models as a key feedback mechanism in the latest phases of massive galaxy formation. Recently, it has been suggested that the two major radio AGN populations�the powerful high-excitation, and the weak low-excitation radio AGNs (HERAGN and ...

High Energy Astrophysics: Radio Galaxies � Geoffrey V. Bicknell Radio Galaxies 1 Fanaroff Laing #12;High Energy Astrophysics: Radio Galaxies 2/56 The prototype FR 2 radio galaxy, Cygnus A Energy Astrophysics: ...

We have carried out a spectropolarimetric search for hidden broad-line quasars in three ultraluminous infrared galaxies (ULIRGs) discovered in the positional correlations between sources detected in deep radio surveys and the {ital IRAS} Faint Source Catalog. Only the high-ionization Seyfert 2 galaxy TF J1736{plus}1122 is highly ...

We have carried out a spectropolarimetric search for hidden broad-line quasars in three ultraluminous infrared galaxies (ULIRGs) discovered in the positional correlations between sources detected in deep radio surveys and the IRAS Faint Source Catalog. Only the high-ionization Seyfert 2 galaxy TF J1736+1122 is highly polarized, ...

Blueshifted absorption lines in the UV and X-ray spectra of active galaxies reveal the presence of massive outflows of ionized gas from their nuclei. The intrinsic UV and X-ray absorbers show large global covering factors of the central continuum source, ...

... the physics of Polar Broad Absorption Line Quasars, the peculiar X-ray object in RBS 1032, a study of the Narrow-Line Seyfert 1 Galaxy RX J0136.9-3510, ...

The purpose of this study was to estimate the frequency and distribution of high-velocity gas in the Galaxy using UV absorption line measurements from archival high-dispersion IUE spectra and to identify particularly interesting regions for future study. ...

The spectra were collected with the LRIS on the Keck II Telescope, which has a 7.7arcmin long slit. We selected galaxies from Palomar Observatory Sky Survey prints of the centre of the Coma cluster. (2 data files).

... A Deep Chandra Observation of the X-shaped Radio Galaxy ... as a mechanism for the formation of wings in X- shaped radio galaxies (XRGs), to date ...

We present a sample of 723 optically selected BL Lac candidates from the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) spectroscopic database encompassing 8250 deg2 of sky; our sample constitutes one of the largest uniform BL Lac samples yet derived. Each BL Lac candidate has a high-quality SDSS spectrum from which we determine spectroscopic redshifts for ~60% of the objects. Redshift lower ...

The damped Ly? and 21 cm absorption-line quasar PKS 1229-021 (z = 1.038) has been mapped in detail with the VLA at seven frequencies, with polarimetry. It has a radio jet, whose rotation measure distribution at 0".46 shows a clear and strong "oscillation" over its length, which is �35h65 kpc at the absorption-line redshift of 0.395. This new, extended, ...

Recent detailed studies of narrow absorption line (NAL) systems in QSO spectra have revealed that at least 50% of QSOs have NALs associated with the central engine, and in most cases they are found to be outflowing. Will studies of NALs provide the much sought-after evidence for ubiquitous QSO feedback that can halt the formation of stars in ...

Recent high-resolution measurements suggest that the soft X-ray spectrum of obscured radio galaxies exhibits signatures of photoionized gas (e.g. 3C 445 and 3C 33) similar to those observed in radio-quiet obscured active galactic nuclei. While signatures of warm absorbing gas covering a wide range of temperature and ionization states ...

We present a detailed analysis of the gas conditions in the H2 luminous radio galaxy 3C 326 N at z ~ 0.1, which has a low star-formation rate (SFR ~ 0.07 M? yr-1) in spite of a gas surface density similar to those in starburst galaxies. Its star-formation efficiency is likely a factor ~10-50 lower than those of ordinary star-forming ...

The possibility that the morphology of radio-galaxy jets may be influenced by interaction with X ray

The distribution of redshifts of 222 radio galaxies has been subjected to a power-spectrum analysis.

... Accession Number : AD0073038. Title : RADIO POLE OF THE GALAXY AT 205 MC. Corporate Author : CORNELL UNIV ...

Aims.We present photoionization calculations for the spatially-extended absorbers observed in front of the extended emission-line spectrum of two high-redshift radio galaxies, 0943-242 (z_e=2.922) and 0200+015 (z_e=2.230), with the aim of reproducing the absorber column ratio, N_CIV/N_HI. Methods: .We explore the effects of using different UV continua in ...

The paper discusses explosions in radio galaxies and quasars and presents a galactic flare model of the mechanism involved.

We present the results of a uniform and systematic search for blueshifted Fe K absorption lines in the X-ray spectra of five bright broad-line radio galaxies observed with Suzaku. We detect, for the first time in radio-loud active galactic nuclei (AGNs) at X-rays, several ...

We present ISO, VLA and BIMA observations of the CO and HI content in two collisional Seyfert galaxies-NGC 985 and NGC 1144 (Arp 118). Both systems exhibit signs that their molecular and atomic gas are in a highly transient state. Both appear to have a huge overabundance of molecular gas relative to atomic, only moderate far-IR luminosities, and both show highly disturbed ...

We have established a new database of absorption and emission line measurements from the Sloan Digital Sky Survey 7th data release for the galaxies within a redshift of 0.2. This work used publicly available codes, pPXF(penalized pixel-fitting) and GANDALF(gas and absorption line fitting), to achieve robust spectral fits and reliable ...

Analysis of the spacing between absorption-line systems in quasar spectra and comparison against deep optical survey data for the separation between superclusters of galaxies indicates that the absorption originates in the superclusters. Supported by analogous data on the absorbing gas in the galactic and Magellanic Cloud halos, this inference sharpens ...

The environments of luminous radio-loud quasars (RLQs) evolve rapidly with redshift: at z=0.6 they are often as rich as Abell class 1 clusters, but at z<0.5 they are never so rich. This rapid, unexplained evolution indicates that the evolution of quasars is tied to their environments. The outstanding feature of quasar evolution is the huge decline in space density from z=2 ...

... radio emission in all our interacting galaxies can be attributed to processes associated with a burst of star formation caused by the galaxy interaction ...

0 galaxy evolution - detection of fossil radio galaxies and very-high-redshift radio gala,xies, and cosmic ray diffusion times and magnetic field ...

Several chains and groups of galaxies were observed at lowfrequencies using the Arecibo radio telescope. No excess radiation over normal galaxies was detected. (auth)

Context: There is growing evidence for the presence of blueshifted Fe K absorption lines in a number of radio-quiet AGNs and QSOs. These may be fundamental to probe flow dynamics near supermassive black holes. Aims: Here we aim to verify and better characterise the existence of such Fe K absorption at ~8-10 keV in the luminous Seyfert ...

A 12 year-long monitoring of the absorption caused by a z = 0.89 spiral galaxy on the line of sight to the radio-loud gravitationally lensed quasar PKS 1830-211 reveals spectacular changes in the HCO+ and HCN (2-1) line profiles. The depth of the absorption toward the quasar NE image increased by a factor of ~ 3 in 1998-1999 and subsequently decreased by a ...

Introduction Spectral Characteristics The Optical/UV Continua and Emission Lines Radio Structure and Properties The X-ray Spectra Absorption Lines AGN Host Galaxies Companions and Interactions Starbursts Cosmological Distribution and Evolution of AGN Finding, Counting and Measuring AGN Luminosity Functions The ...

The document is a status report for work in the areas of pulsating radio sources, quasars, and radio galaxies.

High redshift radio galaxies (HzRGs) are key targets for studies of the formation and evolution of massive galaxies.The role of dust in these processes is uncertain. We have therefore observed the dust continuum emission from a sample of > 3 radio galaxie...

Radio, optical and X-ray observations are presented of the peculiar radio galaxy 3C 433, a Seyfert 2

Narrow interstellar absorption lines of S II 1259.52, Si II 1260.42, and Fe II 1608.46 due to gas in

The discovery of the O VI interstellar absorption lines in our Galaxy by the Copernicus observatory was a turning point in our understanding of the Interstellar Medium (ISM). It implied the presence of widespread hot (approx. 10 to the 6th power K) gas in...

... Pagination or Media Count : 23. Abstract : A model is proposed for the compact bright radio sources ejected from radio galaxies and quasars. ...