247 citations · 1.5k across the 37 of their papers we have counts for
37 papers
Period-Luminosity Relations, projection factor and radii of Anomalous Cepheids
Piotr Wielgórski, Grzegorz Pietrzyński, Wolfgang Gieren +24
Anomalous Cepheids are radially pulsating stars observed in dwarf galaxies, the Galactic bulge and halo, and globular clusters. Similarly to other radially pulsating stars, they ca…
Reevaluating LSST's Capability for Time Delay Measurements in Quasar Accretion Discs
F. Pozo Nuñez, B. Czerny, S. Panda +3
The Legacy Survey of Space and Time (LSST) at the Vera C. Rubin Observatory is poised to observe thousands of quasars using the Deep Drilling Fields (DDF) across six broadband filt…
On the nature of the continuum reverberation of X-ray/UV and optical emission of IRAS 09149-6206
D. H. González-Buitrago, Ma. T. García-Díaz, F. Pozo Nuñez +1
We present the results of a continuum reverberation mapping study of the radio-quiet Seyfert 1 galaxy IRAS 09149-6206. The analysis was performed using X-ray, UV and optical observ…
A Gaussian process cross-correlation approach to time delay estimation in active galactic nuclei
F. Pozo Nuñez, N. Gianniotis, K. L. Polsterer
We present a probabilistic cross-correlation approach to estimate time delays in the context of reverberation mapping (RM) of Active Galactic Nuclei (AGN). We reformulate the tradi…
Modeling photometric reverberation mapping data for the next generation of big data surveys. Quasar accretion disks sizes with the LSST
F. Pozo Nuñez, C. Bruckmann, S. Desamutara +5
Photometric reverberation mapping can detect the radial extent of the accretion disc (AD) in Active Galactic Nuclei by measuring the time delays between light curves observed in di…
Expectations for time-delay measurements in active galactic nuclei with the Vera Rubin Observatory
Bozena Czerny, Swayamtrupta Panda, Raj Prince +10
The Vera Rubin Observatory will provide an unprecedented set of time-dependent observations of the sky. The planned Legacy Survey of Space and Time (LSST) operating for 10 years wi…
An absolute calibration of the near-infrared Period-Luminosity Relations of Type II Cepheids in the Milky Way and in the Large Magellanic Cloud
Piotr Wielgórski, Grzegorz Pietrzyński, Bogumił Pilecki +29
We present time-series photometry of 21 nearby Type II Cepheids in the near-infrared J, H and Ks passbands. We use this photometry, together with the Third Gaia Early Data Release…
Disentangling the optical AGN and Host-galaxy luminosity with a probabilistic Flux Variation Gradient
N. Gianniotis, F. Pozo Nuñez, K. L. Polsterer
We present a novel Probabilistic Flux Variation Gradient (PFVG) approach to to separate the contributions of active galactic nuclei (AGN) and host galaxies in the context of photom…
Variability and the size-luminosity relation of the intermediate mass AGN in NGC 4395
Hojin Cho, Jong-Hak Woo, Edmund Hodges-Kluck +31
We present the variability study of the lowest-luminosity Seyfert 1 galaxy NGC 4395 based on the photometric monitoring campaigns in 2017 and 2018. Using 22 ground-based and space…
Optical continuum photometric reverberation mapping of the Seyfert-1 galaxy Mrk509
F. Pozo Nuñez, N. Gianniotis, J. Blex +6
We present the results of a two year optical continuum photometric reverberation mapping campaign carried out on the nucleus of the Seyfert-1 galaxy Mrk509. Specially designed narr…
A Survey for High-Mass Eclipsing Binaries
F. Pozo Nuñez, R. Chini, A. Barr Domínguez +5
We report results from a search for Galactic high-mass eclipsing binaries. The photometric monitoring campaign was performed in Sloan and with the robotic twin refractor Ro…
Four (Super)luminous Supernovae from the First Months of the ZTF Survey
R. Lunnan, Lin Yan, D. A. Perley +30
We present photometry and spectroscopy of four hydrogen-poor luminous supernovae discovered during the two-month science commissioning and early operations of the Zwicky Transient…
The broad line region and dust torus structure of the Seyfert 1 WPVS48
C. Sobrino Figaredo, F. Pozo Nuñez, M. Ramolla +5
Optical and near-mid-infrared reverberation mapping data obtained at Universitätssternwarte Bochum in Chile and with the Spitzer Space Telescope allow us to explore the geometry of…
Simultaneous H alpha and dust reverberation mapping of 3C120: Testing the bowl-shaped torus geometry
Michael Ramolla, Martin Haas, Christian Westhues +8
At the Universitaetssternwarte Bochum near Cerro Armazones we have monitored the Seyfert-1 galaxy 3C 120 between September 2014 and March 2015 in BVRI and a narrow band filter cove…
Broad-line region structure and line profile variations in the changing look AGN HE1136-2304
W. Kollatschny, M. W. Ochmann, M. Zetzl +5
A strong X-ray outburst was detected in HE1136-2304 in 2014. Accompanying optical spectra revealed that the spectral type has changed from a nearly Seyfert 2 type (1.95), classifie…
Accretion Disk Reverberation Mapping of Active Galactic Nuclei at Wise Observatory
F. Pozo Nuñez, D. Chelouche, S. Kaspi
We have started automatized photometric monitoring of active galactic nuclei using the 46 cm telescope of the Wise Observatory in Israel. The telescope is specially equipped with n…
Methods of Reverberation Mapping. I. Time-lag Determination by Measures of Randomness
Doron Chelouche, Francisco Pozo Nuñez, Shay Zucker
A class of methods for measuring time delays between astronomical time series is introduced in the context of quasar reverberation mapping, which is based on measures of randomness…
Automatized photometric monitoring of active galactic nuclei with the 46 cm telescope of the Wise observatory
F. Pozo Nuñez, D. Chelouche, S. Kaspi +1
We present the first results of an ongoing variability monitoring program of active galactic nuclei (AGNs) using the 46\,cm telescope of the Wise observatory in Israel. The telesco…
Anatomy of the AGN in NGC 5548. VI. Long-term variability of the warm absorber
J. Ebrero, J. S. Kaastra, G. A. Kriss +13
(Abridged) The archetypal Seyfert 1 galaxy NGC 5548 was observed in 2013-2014 in the context of an extensive multiwavelength campaign, which revealed the source to be in an extraor…
Light curves of the latest FUor: Indication of a close binary
M. Hackstein, M. Haas, Á. Kóspál +11
We monitored the recent FUor 2MASS J06593158-0405277 (V960 Mon) since November 2009 at various observatories and multiple wavelengths. After the outburst by nearly 2.9 mag in a…
The stability of the optical flux variation gradient for 3C120
Michael Ramolla, Francisco Pozo Nuñez, Christian Westhues +2
New - and -band monitoring in 2014 2015 reveals that the Seyfert 1 Galaxy, 3C120, has brightened by a magnitude of , compared to our campaign that took place in 2009…
The Bochum Survey of the Southern Galactic Disk: II. Follow-up measurements and multi-filter photometry for 1323 square degrees monitored in 2010-2015
M. Hackstein, Ch. Fein, M. Haas +8
This paper is the second in a series describing the southern Galactic Disk Survey (GDS) performed at the Universitätssternwarte Bochum near Cerro Armazones in Chile. Haas et al. (2…
Circumstellar Disks revealed by / Flux Variation Gradients
F. Pozo Nuñez, M. Haas, R. Chini +2
The variability of young stellar objects (YSO) changes their brightness and color preventing a proper classification in traditional color-color and color magnitude diagrams. We hav…
The broad-line region and dust torus size of the Seyfert 1 galaxy PGC50427
F. Pozo Nuñez, M. Ramolla, C. Westhues +10
We present the results of a three years monitoring campaigns of the type-1 active galactic nucleus (AGN) PGC50427. Through the use of Photometric Reverberation Mapping…