An optical spectroscopic survey of the 3CR sample of radio galaxies with z (2009)
Buttiglione, Sara, Capetti, Alessandro, Celotti, Annalisa, Axon, David J., Chiaberge, Marco, Macchetto, F. Duccio, ...
We use the emission line measurements of 3CR radio sources with redshift < 0.3, to explore their spectroscopic properties. The 3CR sources show a bimodal distribution of Excitation Index, a new...
HST/ACS Emission Line Imaging of Low Redshift 3CR Radio Galaxies I: The Data (2009)
Tremblay, Grant R., Chiaberge, Marco, Sparks, William B., Baum, Stefi A., Allen, Mark G., Axon, David J., ...
We present 19 nearby (z
The soft X-ray polarization in obscured AGN (2009)
Bianchi, Stefano, Matt, Giorgio, Tamborra, Francesco, Chiaberge, Marco, Guainazzi, Matteo, Marinucci, Andrea
The soft X-ray emission in obscured active galactic nuclei (AGN) is dominated by emission lines, produced in a gas photoionized by the nuclear continuum and likely spatially coincident with the...
Low-power Radio Galaxies in the Distant Universe: A search for FRI at 1 (2009)
Chiaberge, Marco, Tremblay, Grant, Capetti, Alessandro, Macchetto, F. Duccio, Tozzi, Paolo, Sparks, William B.
We present a search for FRI radio galaxies between 1 < z < 2 in the COSMOS field. In absence of spectroscopic redshift measurements, the selection method is based on multiple steps which make use of...
Bianchi, Stefano, Piconcelli, Enrico, Chiaberge, Marco, Bailon, Elena Jimenez, Matt, Giorgio, Fiore, Fabrizio
We present the results of a Suzaku monitoring campaign of the Seyfert 2 galaxy, NGC7582. The source is characterized by very rapid (on timescales even lower than a day) changes of the column density...
An optical spectroscopic survey of the 3CR sample of radio galaxies with z (2009)
Buttiglione, Sara, Capetti, Alessandro, Celotti, Annalisa, Axon, David J., Chiaberge, Marco, Macchetto, F. Duccio, ...
We present a homogeneous and 92 % complete dataset of optical nuclear spectra for the 113 3CR radio sources with redshifts < 0.3, obtained with the Telescopio Nazionale Galileo. For these sources we...
An optical spectroscopic survey of the 3CR sample of radio galaxies with z (2009)
Buttiglione, Sara, Capetti, Alessandro, Celotti, Annalisa, Axon, David J., Chiaberge, Marco, Macchetto, F. Duccio, ...
We present a homogeneous and 92 % complete dataset of optical nuclear spectra for the 113 3CR radio sources with redshifts < 0.3, obtained with the Telescopio Nazionale Galileo. For these sources we...
Axon, David, Baum, Stefi, Capetti, Alessandro, Chiaberge, Marco, Macchetto, Duccio, Madrid, Juan, ...
Also archived in: arXiv:0712.0595 v2 11 Jul 2008
WFPC2 LRF Imaging of Emission Line Nebulae in 3CR radio galaxies (2008)
Privon, G., O'Dea, Christopher, Baum, Stefi, Axon, David, Kharb, P., Buchanan, Catherine, ...
Also archived in: arXiv:0710.3105 v1 16 Oct 2007
Chandra unveils a binary Active Galactic Nucleus in Mrk463 (2008)
Bianchi, Stefano, Chiaberge, Marco, Piconcelli, Enrico, Guainazzi, Matteo, Matt, Giorgio
We analyse Chandra, XMM-Newton and HST data of the double-nucleus Ultraluminous Infrared Galaxy (ULIRG), Mrk463. The Chandra detection of two luminous ($\mathrm{L}_\mathrm{2-10 keV}=1.5\times10^{43}$...
Floyd, David J. E., Axon, David, Baum, Stefi, Capetti, Alessandro, Chiaberge, Marco, Macchetto, Duccio, ...
We present the second part of an H-band (1.6 microns) atlas of z
On the nature of optical nuclei in FR I radio-galaxies from ACS/HST imaging polarimetry (2007)
Capetti, Alessandro, Axon, David J., Chiaberge, Marco, Sparks, William B., Macchetto, F. Duccio, Cracraft, Misty, ...
We obtained optical imaging polarimetry with the ACS/HRC aboard the HST of the 9 closest radio-galaxies in the 3C catalogue with an FR I morphology. The nuclear sources seen in direct HST images in...
On the nature of optical nuclei in FR I radio-galaxies from ACS/HST imaging polarimetry (2007)
Capetti, Alessandro, Axon, David, Chiaberge, Marco, Sparks, William, Macchetto, Ferdinando, Cracraft, Misty, ...
Also archived in: arXiv:0706.1944 v1 Jun 13 2007
On the nature of optical nuclei in FR I radio-galaxies from ACS/HST imaging polarimetry (2007)
Capetti, Alessandro, Axon, David J., Chiaberge, Marco, Sparks, William B., Macchetto, F. Duccio, Cracraft, Misty, ...
We obtained optical imaging polarimetry with the ACS/HRC aboard the HST of the 9 closest radio-galaxies in the 3C catalogue with an FR I morphology. The nuclear sources seen in direct HST images in...
Isophotal Structure and Dust Distribution in Radio-Loud Elliptical Galaxies (2007)
Tremblay, Grant R., Chiaberge, Marco, Donzelli, Carlos J., Quillen, Alice C., Capetti, Alessandro, Sparks, William B., ...
We investigate isophotal properties and dust morphology in the nuclear regions of 84 radio galaxies, imaged in the optical and near-infrared as part of Hubble Space Telescope snapshot surveys. We...
Where to look for radiatively inefficient accretion flows (and find them) (2007)
We have studied the nuclear emission detected in high-resolution radio and optical data of carefully selected samples of low luminosity AGN (LLAGN) in the local universe. When the Eddington ratio is...
Donzelli, Carlos J., Chiaberge, Marco, Macchetto, F. Duccio, Madrid, Juan P., Capetti, Alessandro, Marchesini, Danilo
We analyze the near-infrared luminosity profiles and photometric parameters of the host galaxies of 3CR radio sources with z
A multiwavelength map of the nuclear region of NGC7582 (2006)
Bianchi, Stefano, Chiaberge, Marco, Piconcelli, Enrico, Guainazzi, Matteo
We performed a detailed analysis of the Chandra and HST images of the Seyfert 2 galaxy, NGC7582. The dust lane, as mapped by the HST NIR and optical images, strongly influences the morphology of the...
Madrid, Juan P., Chiaberge, Marco, Floyd, David, Sparks, William B., Macchetto, Duccio, Miley, George K., ...
We present newly acquired images of the near-infrared counterpart of 3CR radio sources. All the sources were selected to have a redshift of less than 0.3 to allow us to obtain the highest spatial...
An optical-IR jet in 3C133 (2006)
Floyd, David J. E., Laing, Robert, Chiaberge, Marco, Perlman, Eric, Sparks, William, Macchetto, Duccio, ...
We report the discovery of a new optical-IR synchrotron jet in the radio galaxy 3C133 from our HST/NICMOS snapshot survey. The jet and eastern hotspot are well resolved, and visible at both optical...
The Warped nuclear disk of radio galaxy 3C 449 (2006)
Tremblay, Grant, Quillen, Alice, Floyd, David, Noel-Storr, Jacob, Baum, Stefi A., Axon, David, ...
Also archived in: arXiv:astro-ph/0510650 v3 25 Jan 2006
The warped nuclear disk of radio galaxy 3C 449 (2006)
Tremblay, Grant, Quillen, Alice, Floyd, David, Noel-Storr, Jacob, Baum, Stefi, Axon, David, ...
Also archived in: arXiv:astro-ph/0510650 v3 25 Jan 2006
An optical-IR jet in 3C 133 (2005)
Floyd, David, Laing, Robert, Chiaberge, Marco, Perlman, Eric, Sparks, William, Macchetto, Duccio, ...
Also archived in: arXiv:astro-ph/0602021 v1 1 Feb 2006 AND Space Telescope Science Institute Eprint #1711
An optical-IR jet in 3C 133 (2005)
Floyd, David, Laing, Robert, Chiaberge, Marco, Perlman, Eric, Sparks, William, Macchetto, Duccio, ...
Also archived in: arXiv:astro-ph/0602021 v1 1 Feb 2006 AND Space Telescope Science Institute Eprint #1711
The soft X-ray/NLR connection: a single photoionized medium? (2005)
Bianchi, Stefano, Guainazzi, Matteo, Chiaberge, Marco
We present a sample of 8 nearby Seyfert 2 galaxies observed by HST and Chandra. All of the sources present soft X-ray emission which is coincident in extension and overall morphology with the [OIII]...
Madrid, Juan, Chiaberge, Marco, Floyd, David, Sparks, William, Macchetto, Duccio, Miley, George, ...
Archived in: arXiv:astro-ph/0603239 v1 9 Mar 2006
Madrid, Juan, Chiaberge, Marco, Floyd, David, Sparks, William, Macchetto, Duccio, Miley, George, ...
Archived in: arXiv:astro-ph/0603239 v1 9 Mar 2006
Obscured AGN: clues from high-resolution imaging and spectroscopy (2005)
Bianchi, Stefano, Guainazzi, Matteo, Chiaberge, Marco
We present a sample of 8 Seyfert 2 galaxies observed by HST, Chandra and XMM-Newton. All of the sources present soft X-ray emission which is coincident in extension and overall morphology with the...
The Warped Nuclear Disk of Radio Galaxy 3C 449 (2005)
Tremblay, Grant R., Quillen, Alice C., Floyd, David J. E., Noel-Storr, Jacob, Baum, Stefi A., Axon, David, ...
Among radio galaxies containing nuclear dust disks, the bipolar jet axis is generally observed to be perpendicular to the disk major axis. The FR I radio source 3C 449 is an outlier to this...
The infrared-dominated jet of 3C401 (2005)
Chiaberge, Marco, Sparks, William, Macchetto, Duccio, Perlman, Eric, Capetti, Alessandro, Balmaverde, Barbara, ...
Also archived in: arXiv:astro-ph/0505034 v2 16 May 2005
The infrared-dominated jet of 3C401 (2005)
Chiaberge, Marco, Sparks, William, Macchetto, Duccio, Perlman, Eric, Capetti, Alessandro, Balmaverde, Barbara, ...
Also archived in: arXiv:astro-ph/0505034 v2 16 May 2005
The infrared-dominated jet of 3C401 (2005)
Chiaberge, Marco, Sparks, William. B., Macchetto, F. Duccio, Perlman, Eric, Capetti, Alessandro, Balmaverde, Barbara, ...
We present a Hubble Space Telescope image of the FRII radio galaxy 3C 401, obtained at 1.6 microns with the NICMOS camera in which we identify the infrared counterpart of the brightest region of the...
The HST view of the nuclear emission line region in low luminosity radio-galaxies (2005)
Capetti, Alessandro, Kleijn, Gijs Verdoes, Chiaberge, Marco
We study the properties of the emission line regions in two samples of low luminosity radio-galaxies (LLRG), focusing on the compact emission line region (CELR) revealed to be a characteristic...
The HST view of LINERs nuclei: evidence for a dual population? (2005)
Chiaberge, Marco, Capetti, Alessandro, Macchetto, F. Duccio
We study a complete and distance-limited sample of 25 LINERs, 21 of which have been imaged with the Hubble Space Telescope. In nine objects we detect an unresolved nucleus. In order to study their...
The nuclear radio-optical properties of intermediate redshift FRII radio galaxies and quasars (2004)
Varano, Stefania, Chiaberge, Marco, Macchetto, F. Duccio, Capetti, Alessandro
We extend the study of the nuclei of 3CR objects as seen with the HST to higher redshift FR II radio sources (0.4
New insights on unification of radio-loud AGN (2004)
The radio-loud AGN unification model associates powerful radio galaxies with radio-loud quasars and blazars. In analogy with the radio-quiet scheme, the nuclear regions of objects showing only narrow...
The nuclear SED of NGC6251: a BL Lac in the center of an FR I radio galaxy (2003)
Chiaberge, Marco, Gilli, Roberto, Capetti, Alessandro, Macchetto, F. Duccio
We determine the nuclear spectral energy distribution (SED) from the radio to the gamma-ray band for the FR I radio galaxy NGC6251, by using both data from the literature and analyzing HST and X-ray...
A multi-wavelength test of the FR I-BL Lac unifying model (2003)
Trussoni, E., Capetti, Alessandro, Celotti, Annalisa, Chiaberge, Marco, Feretti, L.
We collect multi-wavelength measurements of the nuclear emission of 20 low luminosity FR I radio-galaxies to test the viability of the FR I - BL Lac unifying model. Although poorly sampled, the...
Understanding the nature of FRII optical nuclei: a new diagnostic plane for radio galaxies (2002)
Chiaberge, Marco, Capetti, Alessandro, Celotti, Annalisa
We extend our study of the nuclei of 3CR FR II radio galaxies through HST optical images up to z=0.3. In the majority of them an unresolved nucleus (central compact core, CCC) is found. We analyze...
Chiaberge, Marco, Gilli, Roberto, Macchetto, F. Duccio, Sparks, William B., Capetti, Alessandro
The HST/STIS ultraviolet image of the FR I radio galaxy 3C270 shows the presence of a jet-like structure emerging from the position of the nucleus. This feature, which represents the first jet-like...
Allen, Mark, Sparks, William, Koekemoer, Anton, Martel, Andre, O'Dea, Christopher, Baum, Stefi, ...
Also archived in: arXiv: astro-ph/0112208 v1 10 Dec 2001
Allen, Mark, Sparks, William, Koekemoer, Anton, Martel, Andre, O'Dea, Christopher, Baum, Stefi, ...
Also archived in: arXiv: astro-ph/0112208 v1 10 Dec 2001
The nuclei of radio galaxies in the UV: the signature of different emission processes (2002)
Chiaberge, Marco, Macchetto, F. Duccio, Sparks, William B., Capetti, Alessandro, Allen, Mark G., Martel, Andre' R.
We have studied the nuclei of 28 radio galaxies from the 3CR sample in the UV band. Unresolved nuclei (central compact cores, CCC) are observed in 10 of the 13 FR I, and in 5 of the 15 FR II. All...
Understanding the nature of FR II optical nuclei: A new diagnostic plane for radio galaxies (2002)
Chiaberge, Marco, Capetti, Alessandro, Celotti, Annalisa
We extend our study of the nuclei of 3CR FR II radio galaxies through HST optical images up to z=0.3. In the majority of them an unresolved nucleus (central compact core, CCC) is found. We analyze...
Ultraviolet HST Snapshot Survey of 3CR Radio Source Counterparts at Low Redshift (2001)
Allen, Mark G., Sparks, William B., Koekemoer, Anton, Martel, Andre R., O'dea, Christopher P., Baum, Stefi A., ...
We present ultraviolet images of 27 3CR radio galaxies with redshifts z
The BL Lac heart of Centaurus A (2001)
Chiaberge, Marco, Capetti, Alessandro, Celotti, Annalisa
Emission from the nucleus of the closest radio galaxy, Centaurus A, is observed from the radio to the gamma ray band. We build, for the first time, its overall Spectral Energy Distribution (SED) that...
Chiaberge, Marco, Celotti, Annalisa, Capetti, Alessandro, Ghisellini, Gabriele
We explore the viability of the unification of BL Lacs and FR I radio galaxies by comparing the core emission of radio galaxies with those of BL Lacs, taking advantage of the newly measured optical...
Does the unification of BL Lac and FR I radio galaxies require jet velocity structures? (2000)
Chiaberge, Marco, Celotti, Annalisa, Capetti, Alessandro, Ghisellini, Gabriele
We explore the viability of the unification of BL Lacs and FR I radio galaxies by comparing the core emission of radio galaxies with those of BL Lacs of similar extended radio power, taking advantage...
The HST view of the FR I / FR II dichotomy (2000)
Chiaberge, Marco, Capetti, Alessandro, Celotti, Annalisa
In order to explore how the FR I / FR II dichotomy is related to the nuclear properties of radio galaxies, we studied a complete sample of 26 nearby FR II radio galaxies using Hubble Space Telescope...
The HST view of FR I radio galaxies: evidence for non-thermal nuclear sources (1999)
Chiaberge, Marco, Capetti, Alessandro, Celotti, Annalisa
Unresolved nuclear sources are detected by the Hubble Space Telescope in the great majority of a complete sample of 33 FR I radio galaxies belonging to the 3CR catalogue. The optical flux of these...
The HST view of FR I radio galaxies: evidence for non-thermal nuclear sources (1999)
Chiaberge, Marco, Capetti, Alessandro, Celotti, Annalisa
Unresolved nuclear sources are detected by the Hubble Space Telescope in the great majority of a complete sample of 33 FR I radio galaxies belonging to the 3CR catalogue. The optical flux of these...
Rapid variability in the synchrotron self-Compton model for blazars (1999)
Ghisellini, Gabriele, Chiaberge, Marco
Blazars are characterized by large amplitude and fast variability, indicating that the electron distribution is rapidly changing, often on time scales shorter than the light crossing time. The...
Rapid variability of BL Lacs and time lags: what can we learn? (1998)
Chiaberge, Marco, Celotti, Annalisa, Ghisellini, Gabriele
The quasi-symmetric shape of the lightcurves, as seen in the X-rays and in the optical, together with the fast variations of the flux observed, suggest that the cooling time for the highest energy...
Rapid variability in the synchrotron self Compton model for blazars (1998)
Chiaberge, Marco, Ghisellini, Gabriele
Blazars are characterized by large amplitude and fast variability, indicating that the electron distribution is rapidly changing, often on time scales shorter than the light crossing time. The...
Rapid variability of blazars (1998)
Chiaberge, Marco, Ghisellini, Gabriele
Blazars are characterized by large amplitude and fast variability, indicating that the electron distribution is rapidly changing, often on time scales shorter than the light crossing time. We study...
Time dependent spectra of Blazars (1996)
Chiaberge, Marco, Ghisellini, Gabriele
We calculate the time dependent electron distribution under the assumption of continuous injection of new relativistic particles, and assuming radiative cooling (by sinchrotron and inverse Compton)...