464 citations · 9.7k across the 212 of their papers we have counts for
13 papers · 1 filter
SMILE: Search for MIlli-LEnses
C. Casadio, D. Blinov, A. C. S. Readhead +17
Dark Matter (DM) halos with masses below , which would help to discriminate between DM models, may be detected through their gravitational effect on distant…
Intrinsic brightness temperatures of blazar jets at 15 GHz
T. Hovatta, E. M. Leitch, D. C. Homan +5
We have developed a new Bayesian Markov Chain Monte Carlo method to deconvolve light curves of blazars into individual flares, including proper estimation of the fit errors. We use…
NuSTAR detection of the blazar B2 1023+25 at redshift 5.3
T. Sbarrato, G. Tagliaferri, G. Ghisellini +19
B2 1023+25 is an extremely radio-loud quasar at z=5.3 which was first identified as a likely high-redshift blazar candidate in the SDSS+FIRST quasar catalog. Here we use the Nuclea…
VLBA observations of a rare multiple quasar imaging event caused by refraction in the interstellar medium
A. B. Pushkarev, Y. Y. Kovalev, M. L. Lister +9
We report on the first detection of the theoretically-predicted rare phenomenon of multiple parsec-scale imaging of an active galactic nucleus induced by refractive effects due to…
MOJAVE: Monitoring of Jets in Active Galactic Nuclei with VLBA Experiments. VIII. Faraday rotation in parsec-scale AGN jets
T. Hovatta, M. L. Lister, M. F. Aller +5
We report observations of Faraday rotation measures (RMs) for a sample of 191 extragalactic radio jets observed within the MOJAVE program. Multifrequency VLBA observations were car…
Correlation between Fermi/LAT gamma-ray and 37 GHz radio properties of northern AGN averaged over 11 months
E. Nieppola, M. Tornikoski, E. Valtaoja +4
Although the Fermi mission has increased our knowledge of gamma-ray AGN, many questions remain, such as the site of gamma-ray production, the emission mechanism, and the factors th…
Gamma-Ray and Parsec-Scale Jet Properties of a Complete Sample of Blazars From the MOJAVE Program
M. L. Lister, M. Aller, H. Aller +142
We investigate the Fermi LAT gamma-ray and 15 GHz VLBA radio properties of a joint gamma-ray- and radio-selected sample of AGNs obtained during the first 11 months of the Fermi mis…
Another look at the BL Lacertae flux and spectral variability
C. M. Raiteri, M. Villata, L. Bruschini +52
The GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT) monitored BL Lacertae in 2008-2009 at radio, near-IR, and optical frequencies. During this period,…
Disk-Jet Connection in Agns and Microquasars: The Possibility of Thermal Flares in the Center
Joni Tammi, Talvikki Hovatta
We discuss the possibility of thermal flares in centers of AGNs and microquasars. We present preliminary results of an ongoing study trying to assess the feasibility of a hypothesi…
Probing the Inner Jet of the Quasar PKS 1510-089 with Multi-waveband Monitoring during Strong Gamma-ray Activity
Alan P. Marscher, Svetlana G. Jorstad, Valeri M. Larionov +29
We present results from monitoring the multi-waveband flux, linear polarization, and parsec-scale structure of the quasar PKS 1510-089, concentrating on eight major gamma-ray flare…
Relativistic beaming and gamma-ray brightness of blazars
T. Savolainen, D. C. Homan, T. Hovatta +5
We investigate the dependence of gamma-ray brightness of blazars on intrinsic properties of their parsec-scale radio jets and the implication for relativistic beaming. By combining…
Long-term variability of radio-bright BL Lacertae objects
E. Nieppola, T. Hovatta, M. Tornikoski +3
Radio-bright BL Lacertae objects (BLOs) are typically variable and exhibit prominent flaring. We use a sample of 24 BLOs to get a clear idea of their flaring behavior and to find p…
The GASP-WEBT monitoring of 3C 454.3 during the 2008 optical-to-radio and gamma-ray outburst
M. Villata, C. M. Raiteri, M. A. Gurwell +6
Since 2001, the radio quasar 3C 454.3 has undergone a period of high optical activity, culminating in the brightest optical state ever observed, during the 2004-2005 outburst. The…