Zobrazeno 71 - 80
of 1 514
pro vyhledávání: '"Georgakakis, A."'
Autor:
Koutoulidis, L., Plionis, M., Georgantopoulos, I., Georgakakis, A., Akylas, A., Basilakos, S., Mountrichas, G.
Publikováno v:
A&A 590, A23 (2016)
The angular correlation function is a powerful tool for deriving the clustering properties of AGN and hence the mass of the corresponding dark matter halos in which they reside. However, studies based on the application of the angular correlation fun
Externí odkaz:
http://arxiv.org/abs/1602.08598
Autor:
Mountrichas, G., Georgakakis, A., Menzel, M. L., Fanidakis, N., Merloni, A., Liu, Z., Salvato, M., Nandra, K.
The northern tile of the wide-area and shallow XMM-XXL X-ray survey field is used to estimate the average dark matter halo mass of relatively luminous X-ray selected AGN [$\rm log\, L_X (\rm 2-10\,keV)= 43.6^{+0.4}_{-0.4}\,erg/s$] in the redshift int
Externí odkaz:
http://arxiv.org/abs/1602.01856
Autor:
Fotopoulou, S., Buchner, J., Georgantopoulos, I., Hasinger, G., Salvato, M., Georgakakis, A., Cappelluti, N., Ranalli, P., Hsu, L. T., Brusa, M., Comastri, A., Miyaji, T., Nandra, K., Aird, J., Paltani, S.
Publikováno v:
A&A 587, A142 (2016)
The active galactic nuclei X-ray luminosity function traces actively accreting supermassive black holes and is essential for the study of the properties of the active galactic nuclei (AGN) population, black hole evolution, and galaxy-black hole coevo
Externí odkaz:
http://arxiv.org/abs/1601.06002
Autor:
Menzel, Marie-Luise, Merloni, Andrea, Georgakakis, Antonis, Salvato, Mara, Aubourg, Eric, Brandt, William Nielsen, Brusa, Marcella, Buchner, Johannes, Dwelly, Tom, Nandra, Kirpal, Pâris, Isabelle, Petitjean, Patrick, Schwope, Axel
This paper presents a survey of X-ray selected active galactic nuclei (AGN) with optical spectroscopic follow-up in a $\sim 18\, \rm{deg^2}$ area of the equatorial XMM-XXL north field. A sample of 8445 point-like X-ray sources detected by XMM-Newton
Externí odkaz:
http://arxiv.org/abs/1511.07870
Autor:
Runnoe, Jessie C., Cales, Sabrina, Ruan, John J., Eracleous, Michael, Anderson, Scott F., Shen, Yue, Green, Paul, Morganson, Eric, LaMassa, Stephanie, Greene, Jenny E., Dwelly, Tom, Schneider, Donald P., Merloni, Andrea, Georgakakis, Antonis
We report the discovery of a new "changing-look" quasar, SDSS J101152.98+544206.4, through repeat spectroscopy from the Time Domain Spectroscopic Survey. This is an addition to a small but growing set of quasars whose blue continua and broad optical
Externí odkaz:
http://arxiv.org/abs/1509.03640
Autor:
Ruan, John J., Anderson, Scott F., Cales, Sabrina L., Eracleous, Michael, Green, Paul J., Morganson, Eric, Runnoe, Jessie C., Shen, Yue, Wilkinson, Tessa D., Blanton, Michael R., Dwelly, Tom, Georgakakis, Antonis, Greene, Jenny E., LaMassa, Stephanie M., Merloni, Andrea, Schneider, Donald P.
The uncertain origin of the recently-discovered `changing-looking' quasar phenomenon -- in which a luminous quasar dims significantly to a quiescent state in repeat spectroscopy over ~10 year timescales -- may present unexpected challenges to our und
Externí odkaz:
http://arxiv.org/abs/1509.03634
Autor:
Dawson, Kyle S., Kneib, Jean-Paul, Percival, Will J., Alam, Shadab, Albareti, Franco D., Anderson, Scott F., Armengaud, Eric, Aubourg, Eric, Bailey, Stephen, Bautista, Julian E., Berlind, Andreas A., Bershady, Matthew A., Beutler, Florian, Bizyaev, Dmitry, Blanton, Michael R., Blomqvist, Michael, Bolton, Adam S., Bovy, Jo, Brandt, W. N., Brinkmann, Jon, Brownstein, Joel R., Burtin, Etienne, Busca, N. G., Cai, Zheng, Chuang, Chia-Hsun, Clerc, Nicolas, Comparat, Johan, Cope, Frances, Croft, Rupert A. C., Cruz-Gonzalez, Irene, da Costa, Luiz N., Cousinou, Marie-Claude, Darling, Jeremy, de la Macorra, Axel, de la Torre, Sylvain, Delubac, Timothee, Bourboux, Helion du Mas des, Dwelly, Tom, Ealet, Anne, Eisenstein, Daniel J., Eracleous, Michael, Escoffier, S., Fan, Xiaohui, Finoguenov, Alexis, Font-Ribera, Andreu, Frinchaboy, Peter, Gaulme, Patrick, Georgakakis, Antonis, Green, Paul, Guo, Hong, Guy, Julien, Ho, Shirley, Holder, Diana, Huehnerhoff, Joe, Hutchinson, Timothy, Jing, Yipeng, Jullo, Eric, Kamble, Vikrant, Kinemuchi, Karen, Kirkby, David, Kitaura, Francisco-Shu, Klaene, Mark A., Laher, Russ R., Lang, Dustin, Laurent, Pierre, Goff, Jean-Marc Le, Li, Cheng, Liang, Yu, Lima, Marcos, Lin, Qiufan, Lin, Weipeng, Lin, Yen-Ting, Long, Daniel C., Lundgren, Britt, MacDonald, Nicholas, Maia, Marcio Antonio Geimba, Malanushenko, Elena, Malanushenko, Viktor, Mariappan, Vivek, McBride, Cameron K., McGreer, Ian D., Menard, Brice, Merloni, Andrea, Meza, Andres, Montero-Dorta, Antonio D., Muna, Demitri, Myers, Adam D., Nandra, Kirpal, Naugle, Tracy, Newman, Jeffrey A., Noterdaeme, Pasquier, Nugent, Peter, Ogando, Ricardo, Olmstead, Matthew D., Oravetz, Audrey, Oravetz, Daniel J., Padmanabhan, Nikhil, Palanque-Delabrouille, Nathalie, Pan, Kaike, Parejko, John K., Paris, Isabelle, Peacock, John A., Petitjean, Patrick, Pieri, Matthew M., Pisani, Alice, Prada, Francisco, Prakash, Abhishek, Raichoor, Anand, Reid, Beth, Rich, James, Ridl, Jethro, Rodriguez-Torres, Sergio, Rosell, Aurelio Carnero, Ross, Ashley J., Rossi, Graziano, Ruan, John, Salvato, Mara, Sayres, Conor, Schneider, Donald P., Schlegel, David J., Seljak, Uros, Seo, Hee-Jong, Sesar, Branimir, Shandera, Sarah, Shu, Yiping, Slosar, Anze, Sobreira, Flavia, Streblyanska, Alina, Suzuki, Nao, Tao, Charling, Taylor, Donna, Tinker, Jeremy L., Tojeiro, Rita, Vargas-Magana, Mariana, Wang, Yuting, Weaver, Benjamin A., Weinberg, David H., White, Martin, Wood-Vasey, W. M., Yeche, Christophe, Zhai, Zhongxu, Zhao, Cheng, Zhao, Gong-bo, Zheng, Zheng, Zhu, Guangtun Ben, Zou, Hu
The Extended Baryon Oscillation Spectroscopic Survey (eBOSS) will conduct novel cosmological observations using the BOSS spectrograph at Apache Point Observatory. Observations will be simultaneous with the Time Domain Spectroscopic Survey (TDSS) desi
Externí odkaz:
http://arxiv.org/abs/1508.04473
Autor:
Georgakakis, A., Aird, J., Buchner, J., Salvato, M., Menzel, M. -L., Brandt, W. N., McGreer, I. D., Dwelly, T., Mountrichas, G., Koki, K., Georgantopoulos, I., Hsu, L. -T., Merloni, A., Liu, Z., Nandra, K., Ross, N. P.
We combine deep X-ray survey data from the Chandra observatory and the wide-area/shallow XMM-XXL field to estimate the AGN X-ray luminosity function in the redshift range z=3-5. The sample consists of nearly 340 sources with either photometric (212)
Externí odkaz:
http://arxiv.org/abs/1507.07558
Autor:
Nandra, K., Laird, E. S., Aird, J. A., Salvato, M., Georgakakis, A., Barro, G., Gonzalez, P. G. Perez, Barmby, P., Chary, R. -R., Coil, A., Cooper, M. C., Davis, M., Dickinson, M., Faber, S. M., Fazio, G. G., Guhathakurta, P., Gwyn, S., Hsu, L. -T., Huang, J. -S., Ivison, R. J., Koo, D. C., Newman, J. A., Rangel, C., Yamada, T., Willmer, C.
We present the results of deep \chandra\ imaging of the central region of the Extended Groth Strip, the AEGIS-X Deep (AEGIS-XD) survey. When combined with previous \chandra\ observations of a wider area of the strip, AEGIS-X Wide (AEGIS-XW; Laird et~
Externí odkaz:
http://arxiv.org/abs/1503.09078
Autor:
Merloni, A., Dwelly, T., Salvato, M., Georgakakis, A., Greiner, J., Krumpe, M., Nandra, K., Ponti, G., Rau, A.
We argue that the `changing look' AGN recently reported by LaMassa et al. could be a luminous flare produced by the tidal disruption of a super-solar mass star passing just a few gravitational radii outside the event horizon of a $\sim 10^8 M_{\odot}
Externí odkaz:
http://arxiv.org/abs/1503.04870