Zobrazeno 1 - 10
of 583
pro vyhledávání: '"LaMassa, S."'
Narrow Fe K$\alpha$ fluorescent emission lines arising at $\sim$kpc-scale separations from the nucleus have only been detected in a few AGN. The detections require that the extended line emission be spatially resolved and sufficiently bright. Compare
Externí odkaz:
http://arxiv.org/abs/2312.00124
Autor:
Boorman, P. G., Torres-Albà, N., Annuar, A., Marchesi, S., Pfeifle, R., Stern, D., Civano, F., Baloković, M., Buchner, J., Ricci, C., Alexander, D. M., Brandt, W. N., Brightman, M., Chen, C. T., Creech, S., Gandhi, P., García, J. A., Harrison, F., Hickox, R., Kammoun, E., LaMassa, S., Lanzuisi, G., Marcotulli, L., Madsen, K., Matt, G., Matzeu, G., Nardini, E., Piotrowska, J. M., Pizzetti, A., Puccetti, S., Sicilian, D., Silver, R., Walton, D. J., Wilkins, D. R., Zhao, X.
Ever since the discovery of the first Active Galactic Nuclei (AGN), substantial observational and theoretical effort has been invested into understanding how massive black holes have evolved across cosmic time. Circum-nuclear obscuration is now estab
Externí odkaz:
http://arxiv.org/abs/2311.04949
We present a new analysis of the Suzaku X-ray spectrum of the Compton-thin Seyfert 2 galaxy NGC 4388. The spectrum above $\sim$2 keV can be described by a remarkably simple and rather mundane model, consisting of a uniform, neutral spherical distribu
Externí odkaz:
http://arxiv.org/abs/2303.09577
Autor:
Glikman, E., Lacy, M., LaMassa, S., Bradley, C., Djorgovski, S. G., Urrutia, T., Gates, E. L., Graham, M. J., Urry, C. M., Yoon, I.
We present a highly complete sample of broad-line (Type 1) QSOs out to z ~ 3 selected by their mid-infrared colors, a method that is minimally affected by dust reddening. We remove host galaxy emission from the spectra and fit for excess reddening in
Externí odkaz:
http://arxiv.org/abs/2204.13745
We select eight nearby AGNs which, based on previous work, appear to be Compton-thin in the line of sight. We model with MYTORUS their broadband X-ray spectra from 20 individual observations with $Suzaku$, accounting self-consistently for Fe K$\alpha
Externí odkaz:
http://arxiv.org/abs/2108.11971
Autor:
Powell, M. C., Urry, C. M., Cappelluti, N., Johnson, J. T., LaMassa, S. M., Ananna, T. T., Kollmann, K. E.
The clustering of active galactic nuclei (AGN) sheds light on their typical large (Mpc-scale) environments, which can constrain the growth and evolution of supermassive black holes. Here we measure the clustering of luminous X-ray-selected AGN in the
Externí odkaz:
http://arxiv.org/abs/2001.07730
X-ray data for quasar 4C 74.26 have previously been modeled with a broad Fe K$\alpha$ emission line and reflection continuum originating in the inner part of the accretion disk around the central supermassive black hole (SMBH), i.e. the strong gravit
Externí odkaz:
http://arxiv.org/abs/1909.05861
Autor:
Brescia, M., Salvato, M., Cavuoti, S., Ananna, T. T., Riccio, G., LaMassa, S. M., Urry, C. M., Longo, G.
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 489, Issue 1, 2019
With the launch of eROSITA (extended Roentgen Survey with an Imaging Telescope Array), successfully occurred on 2019 July 13, we are facing the challenge of computing reliable photometric redshifts for 3 million of active galactic nuclei (AGNs) over
Externí odkaz:
http://arxiv.org/abs/1909.00606
Autor:
Glikman, E., Lacy, M., LaMassa, S., Stern, D., Djorgovski, S. G., Graham, M. J., Urrutia, T., Lovdal, L., Crnogorcevic, M., Daniels-Koch, H., Hundal, C. B., Urry, C. M., Gates, E. L., Murray, S.
We present a spectroscopically complete sample of 147 infrared-color-selected AGN down to a 22 $\mu$m flux limit of 20 mJy over the $\sim$270 deg$^2$ of the SDSS Stripe 82 region. Most of these sources are in the QSO luminosity regime ($L_{\rm bol} \
Externí odkaz:
http://arxiv.org/abs/1805.06961
Autor:
Pâris, I., Petitjean, P., Aubourg, E., Myers, A. D., Streblyanska, A., Lyke, B. W., Anderson, S. F., Armengaud, E., Bautista, J., Blanton, M. R., Blomqvist, M., Brinkmann, J., Brownstein, J. R., Brandt, W. N., Burtin, E., Dawson, K., de la Torre, S., Georgakakis, A., Gil-Marin, H., Green, P. J., Hall, P. B., Kneib, J. -P., LaMassa, S. M., Goff, J. -M. Le, MacLeod, C., Mariappan, V., McGreer, I. D., Merloni, A., Noterdaeme, P., Delabrouille, N. Palanque, Percival, W. J., Ross, A. J., Rossi, G., Schneider, D. P., Seo, H. -J., Tojeiro, R., Weaver, B. A., Weijmans, A. -M., Yèche, C., Zarrouk, P., Zhao, G. -B.
Publikováno v:
A&A 613, A51 (2018)
We present the Data Release 14 Quasar catalog (DR14Q) from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) of the Sloan Digital Sky Survey IV (SDSS-IV). This catalog includes all SDSS-IV/eBOSS objects that were spectroscopically targeted
Externí odkaz:
http://arxiv.org/abs/1712.05029