221 citations · 2.8k across the 68 of their papers we have counts for
42 papers · 1 filter
Spatially extended absorption around the z=2.63 radio galaxy MRC 2025-218: outflow or infall?
A. Humphrey, M. Villar-Martin, S. F. Sanchez +7
We present an investigation into the absorber in front of the z=2.63 radio galaxy MRC 2025-218, using integral field spectroscopy obtained at the Very Large Telescope, and long sli…
Emission line activity in type 2 quasars from the Sloan Digital Sky Survey
Montse Villar-Martin, Andrew Humphrey, Alejo Martinez-Sansigre +3
We have compared the optical emission line ratios of type 2 quasars from Zakamska et al. with standard AGN photoionization model predictions, Seyfert 2s, HII galaxies, and narrow l…
PKS2250-41: a case study for triggering
K. J. Inskip, M. Villar-Martin, C. N. Tadhunter +3
We present the results of a multiwavelength study of the z = 0.31 radio source PKS2250-41. Integral field unit and long-slit spectroscopy obtained using VIMOS and FORS1 on the VLT,…
Deep spectroscopy of the FUV-optical emission lines from a sample of radio galaxies at z~2.5: metallicity and ionization
A. Humphrey, M. Villar-Martin, J. Vernet +3
We present long-slit NIR spectra, obtained using the ISAAC instrument at the Very Large Telescope, for nine radio galaxies at z~2.5. One-dimensional spectra have been extracted and…
UV and optical emission lines from the z=2.6 radio galaxy 0828+193: spatially resolved measurements
A. Humphrey, F. Iwamuro, M. Villar-Martin +3
We present an investigation into the spatial variation of the rest-frame UV and optical line and continuum emission along the radio axis of the z=2.6 radio galaxy 0828+193, using l…
PKS1932-46: a radio source in an interacting group?
K. J. Inskip, C. N. Tadhunter, D. Dicken +3
We present the results of a multiwavelength study of the z=0.23 radio source PKS1932-46. VIMOS IFU spectroscopy is used to study the morphology, kinematics and ionisation state of…
VIMOS spectroscopy of extended emission line regions
K. J. Inskip, M. Villar-Martin, C. Tadhunter +3
We present the results of spectroscopic and imaging observations of the FRII radio galaxies PKS2250-41 and PKS1932-46. Both sources display very extensive emission line regions, an…
VIMOS-VLT spectroscopy of the giant Ly-alpha nebulae associated with three z~2.5 radio galaxies
M. Villar-Martin, S. F. Sanchez, A. Humphrey +4
The morphological and spectroscopic properties of the giant (>60 kpc) Ly-alpha nebulae associated with three radio galaxies at z~2.5 (MRC 1558-003, MRC 2025-218 and MRC 0140-257) h…
Ly-alpha excess in high redshift radio galaxies: a signature of star formation
M. Villar-Martin, A. Humphrey, C. De Breuck +3
About 54% of radio galaxies at z>3 and 8% of radio galaxies at 2<z<3 show unusually strong Ly-alpha emission, compared with the general population of high redshift (z>2) radio gala…
Giant Lyman-alpha nebulae around z>2 radio galaxies: evidence for infall
A. Humphrey, M. Villar-Martin., R. Fosbury +4
We present an investigation into the possible relationship between side-to-side asymmetries of powerful radio galaxies at high redshift, with the goal of understanding the geometry…
Giant Ly-alpha nebulae in the high redshift (z>2) Universe
Montse Villar-Martin
High redshift radio galaxies (z>2) are believed to be progenitors of the giant ellipticals of today. They are often associated with giant Ly-alpha nebulae (sometimes >100 kpc), whi…
Ionization of large-scale absorbing haloes and feedback events from high-redshift radio galaxies
L. Binette, R. J. Wilman, M. Villar-Martin +3
We present photoionization calculations for the spatially-extended absorbers observed towards the extended emission line spectrum of two high-redshift radio galaxies: 0943-242 (z=2…
Jet-gas interactions in z~2.5 radio galaxies: evolution of the ultraviolet line and continuum emission with radio morphology
A. Humphrey, M. Villar-Martin, R. Fosbury +2
We present an investigation into the nature of the jet-gas interactions in a sample of 10 radio galaxies at 2.3<z<2.9 using deep spectroscopy of the UV line and continuum emission…
VIMOS-VLT and Spitzer observations of a radio galaxy at z=2.5
M. Villar-Martin, S. F. Sanchez, C. De Breuck +8
We present: 1) a kinematic and morphological study of the giant Lya nebula associated with the radio galaxy MRC2104-242 (z = 2.49) based on integral field spectroscopic VIMOS data…
The giant star forming halo associated with the radio galaxy PKS1932-46
Montse Villar-Martin, Clive Tadhunter, Raffaella Morganti +1
We report the discovery of a giant (~160 kpc) knotty extended emission line nebula associated with the radio galaxy PKS1932-46 at z=0.23. The 2-d long slit spectra, obtained with V…
Nebular and stellar properties of a metal poor HII galaxy at z=3.36
Montse Villar-Martin, Miguel Cervino, Rosa Gonzalez Delgado
We have characterized the physical properties (electron temperature, density, metallicity) of the ionized gas and the ionizing population (age, metallicity, presence of WR stars) i…
Emission lines and optical continuum in low-luminosity radio galaxies
K. A. Wills, R. Morganti, C. N. Tadhunter +2
We present spectroscopic observations of a complete sub-sample of 13 low-luminosity radio galaxies selected from the 2Jy sample. The underlying continuum in these sources is carefu…
Kinematically quiet halos around z~2.5 radio galaxies. Keck spectroscopy
M. Villar-Martin, J. Vernet, S. di Serego Alighieri +3
We present the results of the kinematic study of the extended gas in a sample of 10 high redshift radio galaxies (z~2.5) based on high signal to noise Keck II and VLT long slit spe…
Massive star formation in a gravitationally-lensed HII-galaxy at z=3.357
R. A. E. Fosbury, M. Villar-Martin, M. Lombardi +8
The Lynx arc, with a redshift of 3.357, was discovered during spectroscopic follow-up of the z=0.570 cluster RX J0848+4456 from the ROSAT Deep Cluster Survey. The arc is characteri…
Revisiting the location and environment of the central engine in NGC1068
E. Galliano, D. Alloin, G. L. Granato +1
We revisit in this paper the location of the various components observed in the AGN of NGC1068. Discrepancies between previously published studies are explained, and a new measurem…
Giant low surface brightness halos in distant radio galaxies: USS0828+193
M. Villar-Martin, J. Vernet, S. di Serego Alighieri +5
We present results on the spectroscopic study of the ionized gas in the high redshift radio galaxy USS0828+193 at z=2.57. Thanks to the high S/N of the emission lines in the Keck s…
The origin of the UV excess in powerful radio galaxies: spectroscopy and polarimetry of a complete sample of intermediate redshift radio galaxies
C. Tadhunter, R. Dickson, R. Morganti +4
We present spectroscopic and polarimetric observations of a complete, optically unbiased sample of 2Jy radio galaxies at intermediate redshifts (0.15 < z < 0.7). These data -- whic…
Shocks and dust survival in nearby active galaxies: implications for the alignment effect
M. Villar-Martin, D. De Young, A. Alonso-Herrero +2
One of the most popular explanations for the so-called alignment effect in high redshift (z>0.7) radio galaxies is the scattering by dust of the hidden quasar light. As shown by De…
Interpreting the kinematics of the extended gas in distant radiogalaxies from 8-10m telescope spectra
M. Villar-Martin, A. Alonso-Herrero, S. di Serego Alighieri +1
The nature of the extreme kinematics in the extended gas of distant radio galaxies (z>0.7) is still an open question. With the advent of the 8-10 m telescope generation and the dev…