247 citations · 3.3k across the 64 of their papers we have counts for
20 papers · 1 filter
Modelling photometric reverberation data -- a disk-like broad-line region and a potentially larger black hole mass for 3C120
F. Pozo Nuñez, M. Haas, M. Ramolla +7
We consider photometric reverberation mapping, where the nuclear continuum variations are monitored via a broad-band filter and the echo of emission line clouds of the broad line r…
Size and disk-like shape of the broad-line region of ESO399-IG20
F. Pozo Nuñez, C. Westhues, M. Ramolla +6
We present photometric reverberation mapping of the narrow-line Seyfert 1 galaxy ESO399-IG20 performed with the robotic 15 cm telescope VYSOS-6 at the Cerro Armazones Observatory.…
Photometric reverberation mapping of 3C120
F. Pozo Nuñez, M. Ramolla, C. Westhues +5
We present the results of a five month monitoring campaign of the local active galactic nuclei (AGN) 3C120. Observations with a median sampling of two days were conducted with the…
Accretion and outflow of gas in Markarian 509
Jelle Kaastra, Pierre-Olivier Petrucci, Massimo Cappi +13
A major uncertainty in models for photoionised outflows in AGN is the distance of the gas to the central black hole. We present the results of a massive multiwavelength monitoring…
Multiwavelength Campaign on Mrk 509 X. Lower limit on the distance of the absorber from HST COS and STIS spectroscopy
N. Arav, D. Edmonds, B. Borguet +15
Active Galactic Nuclei often show evidence of photoionized outflows. A major uncertainty in models for these outflows is the distance () to the gas from the central black hole.…
Multiwavelength campaign on Mrk 509 VIII. Location of the X-ray absorber
J. S. Kaastra, R. G. Detmers, M. Mehdipour +14
The bright Seyfert 1 galaxy Mrk 509 was monitored by XMM-Newton and other satellites in 2009 to constrain the location of the outflow. We have studied the response of the photoioni…
Characterizing the UV and X-ray Outflow in Mrk 509
G. A. Kriss, N. Arav, J. S. Kaastra +15
We observed Mrk 509 during the fall of 2009 during a multiwavelength campaign using XMM-Newton, Chandra, HST/COS, SWIFT, and Integral. The 600-ks XMM/RGS spectrum finds two kinemat…
Multiwavelength campaign on Mrk 509 VII. Relative abundances of the warm absorber
K. C. Steenbrugge, J. S. Kaastra, R. G. Detmers +14
Context. The study of abundances in the nucleus of active galaxies allows us to investigate the evolution of abundance by comparing local and higher redshift galaxies. However, the…
Multiwavelength campaign on Mrk 509. VI. HST/COS observations of the far-ultraviolet spectrum
G. A. Kriss, N. Arav, J. S. Kaastra +15
We present medium resolution (R~20,000) HST/COS ultraviolet spectra covering 1155-1760 A of the Seyfert 1 Mrk 509 obtained simultaneously with a Chandra/LETGS spectrum as part of a…
Multiwavelength campaign on Mrk 509. V. Chandra-LETGS observation of the ionized absorber
J. Ebrero, G. A. Kriss, J. S. Kaastra +11
We present here the results of a 180 ks Chandra-LETGS observation as part of a large multi-wavelength campaign on Mrk 509. We study the warm absorber in Mrk 509 and use the data fr…
Multiwavelength campaign on Mrk 509. IV. Optical-UV-X-ray variability and the nature of the soft X-ray excess
Missagh Mehdipour, Graziella Branduardi-Raymont, Jelle S. Kaastra +8
We present the analysis of XMM-Newton and Swift optical-UV and X-ray observations of the Seyfert-1/QSO Mrk 509, part of an unprecedented multi-wavelength campaign, investigating th…
Multiwavelength campaign on Mrk 509. III. The 600 ks RGS spectrum: unravelling the inner region of an AGN
R. G. Detmers, J. S. Kaastra, K. C. Steenbrugge +13
We present the results of our 600 ks RGS observation as part of the multiwavelength campaign on Mrk 509. The very high quality of the spectrum allows us to investigate the ionized…
Multiwavelength campaign on Mrk 509. II. Analysis of high-quality Reflection Grating Spectrometer spectra
J. S. Kaastra, C. P. de Vries, K. C. Steenbrugge +11
We study the bright Seyfert 1 galaxy Mrk~509 with the Reflection Grating Spectrometers (RGS) of XMM-Newton using the RGS multi-pointing mode of XMM-Newton for the first time in ord…
Multiwavelength campaign on Mrk 509. I. Variability and spectral energy distribution
J. S. Kaastra, P. -O. Petrucci, M. Cappi +23
(Abridged) Active galactic nuclei show a wealth of interesting physical processes, some of which are poorly understood. We want to address a number of open questions, including the…
Galactic Scale Absorption Outflow in the Low Luminosity Quasar IRAS~F04250-5718: HST/COS Observations
Doug Edmonds, Benoit Borguet, Nahum Arav +17
We present absorption line analysis of the outflow in the quasar IRAS F04250-5718. Far-ultraviolet data from the Cosmic Origins Spectrograph onboard the Hubble Space Telescope reve…
Radio and X-ray emission from disc winds in radio-quiet quasars
K. C. Steenbrugge, E. J. D. Jolley, Z. Kuncic +1
It has been proposed that the radio spectra of radio-quiet quasars is produced by free-free emission in the optically thin part of an accretion disc wind. An important observationa…
XMM-Newton RGS observation of the warm absorber in Mrk 279
J. Ebrero, E. Costantini, J. S. Kaastra +5
The Seyfert 1 galaxy Mrk 279 was observed by XMM-Newton in November 2005 in three consecutive orbits, showing significant short-scale variability (average soft band variation in fl…
XMM-Newton unveils the complex iron K alpha region of Mrk 279
E. Costantini, J. S. Kaastra, K. Korista +4
We present the results of a ~160 ks-long XMM-Newton observation of the Seyfert 1 galaxy Mrk 279. The spectrum shows evidence of both broad and narrow emission features. The Fe K al…
Multiwavelength study of Cygnus A III. Evidence for relic lobe plasma
K. C. Steenbrugge, I. Heywood, K. M. Blundell
We study the particle energy distribution in the cocoon surrounding Cygnus A, using radio images between 151 MHz and 15 GHz and a 200 ks Chandra ACIS-I image. We show that the exce…
High-resolution X-ray spectroscopy of the low and high states of the Seyfert 1 galaxy NGC 4051 with Chandra LETGS
K. C. Steenbrugge, M. Fenovcik, J. S. Kaastra +2
Methods. We analyse two observations taken with the Low Energy Transmission Grating Spectrometer of Chandra. We investigated the spectral response to a sudden flux decrease by a fa…