Search Results - "Siemiginowska, A."

Characteristic Variability Timescales in the Gamma-Ray Power Spectra of Blazars by Ryan, J. L., Siemiginowska, A., Sobolewska, M. A., Grindlay, J.

“…Characteristic variability timescales in blazar γ-ray light curves can provide insights into the physical processes responsible for γ-ray variability. The…”
Get full text

STOCHASTIC MODELING OF THE FERMI /LAT γ-RAY BLAZAR VARIABILITY by Sobolewska, M A, SIEMIGINOWSKA, A, Kelly, B C, NALEWAJKO, K

“…We study the gamma -ray variability of 13 blazars observed with the Fermi/Large Area Telescope (LAT). These blazars have the most complete light curves…”
Get full text

Inverse-Compton scattering in the resolved jet of the high-redshift quasar PKS J1421−0643 by Worrall, D M, Birkinshaw, M, Marshall, H L, Schwartz, D A, Siemiginowska, A, Wardle, J F C

“…ABSTRACT Despite the fact that kpc-scale inverse-Compton (iC) scattering of cosmic microwave background (CMB) photons into the X-ray band is mandated, proof of…”
Get full text

Compact Symmetric Objects. II. Confirmation of a Distinct Population of High-luminosity Jetted Active Galaxies by Kiehlmann, S., Readhead, A. C. S., O’Neill, S., Wilkinson, P. N., Lister, M. L., Liodakis, I., Bruzewski, S., Pavlidou, V., Pearson, T. J., Sheldahl, E., Siemiginowska, A., Tassis, K., Taylor, G. B.

“…Abstract Compact symmetric objects (CSOs) are compact (<1 kpc), jetted active galactic nuclei (AGN), whose jet axes are not aligned close to the line of sight,…”
Get full text

A survey of low-luminosity compact sources and its implication for the evolution of radio-loud active galactic nuclei – I. Radio data by Kunert-Bajraszewska, M., Gawroński, M. P., Labiano, A., Siemiginowska, A.

“…We present a new sample of compact steep spectrum (CSS) sources with radio luminosity below 1026 W Hz−1 at 1.4 GHz; these are called low-luminosity compact…”
Get full text

On the Jet Production Efficiency in a Sample of the Youngest Radio Galaxies by Wójtowicz, A., Stawarz, ., Cheung, C. C., Ostorero, L., Kosmaczewski, E., Siemiginowska, A.

“…Here we discuss the jet production efficiency in a sample of 17 young radio galaxies with measured redshifts, kinematic ages, and nuclear X-ray fluxes, for…”
Get full text

Chandra Observations of NGC 7212: Large-scale Extended Hard X-Ray Emission by Jones, Mackenzie L., Fabbiano, G., Elvis, Martin, Paggi, A., Karovska, M., Maksym, W. P., Siemiginowska, A., Raymond, J.

“…Recent observations of nearby Compton thick (CT) active galactic nuclei (AGNs) with Chandra have resolved hard (>3 keV) X-ray emission extending out from the…”
Get full text

TXS 0128+554: A Young Gamma-Ray-emitting Active Galactic Nucleus with Episodic Jet Activity by Lister, M. L., Homan, D. C., Kovalev, Y. Y., Mandal, S., Pushkarev, A. B., Siemiginowska, A.

“…We have carried out a Chandra X-ray and multifrequency radio Very Long Baseline Array study of the active galactic nucleus (AGN) TXS 0128+554, which is…”
Get full text

Chandra Imaging of the Western Hotspot in the Radio Galaxy Pictor A: Image Deconvolution and Variability Analysis by Thimmappa, R., Stawarz, ., Marchenko, V., Balasubramaniam, K., Cheung, C. C., Siemiginowska, A.

“…Here we present an analysis of the X-ray morphology and flux variability of the particularly bright and extended western hotspot in the nearest powerful (FR…”
Get full text

Deep Chandra observations of Pictor A by Hardcastle, M J, Lenc, E, Birkinshaw, M, Croston, J H, Goodger, J L, Marshall, H L, Perlman, E S, Siemiginowska, A, Stawarz, L, Worrall, D M

“…We report on deep Chandra observations of the nearby broad-line radio galaxy Pictor A, which we combine with new Australia Telescope Compact Array (ATCA)…”
Get full text

Compact Symmetric Objects. III. Evolution of the High-luminosity Branch and a Possible Connection with Tidal Disruption Events by Readhead, A. C. S, Ravi, V., Blandford, R. D., Sullivan, A. G., Somalwar, J., Begelman, M. C., Birkinshaw, M., Liodakis, I., Lister, M. L., Pearson, T. J., Taylor, G. B., Wilkinson, P. N., Globus, N., Kiehlmann, S., Lawrence, C. R., Murphy, D., O’Neill, S., Pavlidou, V., Sheldahl, E., Siemiginowska, A., Tassis, K.

“…Abstract We use a sample of 54 compact symmetric objects (CSOs) to confirm that there are two unrelated CSO classes: an edge-dimmed, low-luminosity class (CSO…”
Get full text

Extended X-Ray Emission in Compton Thick AGN with Deep Chandra Observations by Jones, Mackenzie L., Parker, Kieran, Fabbiano, G., Elvis, Martin, Maksym, W. P., Paggi, A., Ma, Jingzhe, Karovska, M., Siemiginowska, A., Wang, Junfeng

“…Abstract We present the spatial analysis of five Compton thick (CT) active galactic nuclei (AGNs), including MKN 573, NGC 1386, NGC 3393, NGC 5643, and NGC…”
Get full text

The extremely X-ray luminous radio-loud quasar CFHQS J142952 + 544717 at z = 6.18 under Chandra high-angular resolution lens by Migliori, G, Siemiginowska, A, Sobolewska, M, Cheung, C C, Stawarz, Ł, Schwartz, D, Snios, B, Saxena, A, Kashyap, V

“…ABSTRACT We present the first X-ray observation at sub-arcsecond resolution of the high-redshift (z = 6.18) radio-loud quasar CFHQS J142952 + 544717 (J1429)…”
Get full text

Deep Chandra Observations of ESO 428-G014. IV. The Morphology of the Nuclear Region in the Hard Continuum and Fe Kα Line by Fabbiano, G., Siemiginowska, A., Paggi, A., Elvis, M., Volonteri, M., Mayer, L., Karovska, M., Maksym, W. P., Risaliti, G., Wang, Junfeng

“…Abstract We report the results of high-resolution subpixel imaging of the hard continuum and Fe K α line of the Compton-thick (CT) active galactic nucleus…”
Get full text

Discovery of a bright extended X-ray jet in RGB J1512+020A by Migliori, G, Siemiginowska, A, Cheung, C C, Celotti, A, Giroletti, M, Giovannini, G, Paggi, A, Liuzzo, E

“…ABSTRACT We report the discovery of a bright, extended X-ray jet in the quasar RGB J1512+020A (z = 0.22). Chandra observations show the X-ray core and 13…”
Get full text

The Chandra-COSMOS survey - IV. X-ray spectra of the bright sample by Lanzuisi, G., Civano, F., Elvis, M., Salvato, M., Hasinger, G., Vignali, C., Zamorani, G., Aldcroft, T., Brusa, M., Comastri, A., Fiore, F., Fruscione, A., Gilli, R., Ho, L. C., Mainieri, V., Merloni, A., Siemiginowska, A.

“…We present the X-ray spectral analysis of the 390 brightest extragalactic sources in the Chandra-Cosmic Evolution Survey catalogue, showing at least 70 net…”
Get full text

Two Candidate High-redshift X-Ray Jets without Coincident Radio Jets by Schwartz, D. A., Siemiginowska, A., Snios, B., Worrall, D. M., Birkinshaw, M., Cheung, C. C., Marshall, H., Migliori, G., Wardle, J. F. C., Gobeille, Doug

“…Abstract We report the detection of extended X-ray emission from two high-redshift radio quasars. These quasars, J1405+0415 at z  = 3.208 and J1610+1811 at z…”
Get full text

Jet–ISM Interaction in NGC 1167/B2 0258+35, an LINER with an AGN Past by Fabbiano, G., Paggi, A., Morganti, R., Baloković, M., Elvis, M., Mukherjee, D., Meenakshi, M., Siemiginowska, A., Murthy, S. M., Oosterloo, T. A., Wagner, A. Y., Bicknell, G.

“…Abstract We report the results of joint Chandra/ACIS—NuSTAR deep observations of NGC 1167, the host galaxy of the young radio jet B2 0258+35. In the ACIS data,…”
Get full text

Mid-infrared Diagnostics of the Circumnuclear Environments of the Youngest Radio Galaxies by Kosmaczewski, E., Stawarz, ., Siemiginowska, A., Cheung, C. C., Ostorero, L., Sobolewska, M., Kozie -Wierzbowska, D., Wójtowicz, A., Marchenko, V.

“…We present a systematic analysis of the mid-infrared (MIR) properties of the youngest radio galaxies, based on low-resolution data provided by the Wide-field…”
Get full text

Chandra View of the LINER-type Nucleus in the Radio-loud Galaxy CGCG 292-057: Ionized Iron Line and Jet-ISM Interactions by Balasubramaniam, K., Stawarz, ., Marchenko, V., Sobolewska, M., Cheung, C. C., Siemiginowska, A., Thimmappa, R., Kosmaczewski, E.

“…We present an analysis of the new, deep (94 ksec) Chandra ACIS-S observation of radio-loud active galaxy CGCG 292−057, characterized by a LINER-type nucleus…”
Get full text