Zobrazeno 1 - 10
of 577
pro vyhledávání: '"Georgantopoulos P"'
X-ray surveys provide the most efficient means for the detection of Active Galactic Nuclei (AGN). However, they face difficulties in detecting the most heavily obscured Compton-thick AGN. The BAT detector on board the Gehrels/Swift mission, operating
Externí odkaz:
http://arxiv.org/abs/2409.20015
Autor:
Quintin, E., Webb, N. A., Georgantopoulos, I., Gupta, M., Kammoun, E., Michel, L., Schwope, A., Tranin, H., Traulsen, I.
Over recent decades, astronomy has entered the era of massive data and real-time surveys. This is improving the study of transient objects - although they still contain some of the most poorly understood phenomena in astrophysics, as it is inherently
Externí odkaz:
http://arxiv.org/abs/2405.13630
Publikováno v:
A&A 688, A79 (2024)
In this study, we utilize a sample of 338 galaxies within the redshift range of $\rm 0.02
Externí odkaz:
http://arxiv.org/abs/2405.11022
Autor:
Vijarnwannaluk, Bovornpratch, Akiyama, Masayuki, Schramm, Malte, Ueda, Yoshihiro, Matsuoka, Yoshiki, Toba, Yoshiki, Matsumoto, Naoki, Ruiz, Angel, Georgantopoulos, Ioannis, Pouliasis, Ektoras, Koulouridis, Elias, Ichikawa, Kohei, Sawicki, Marcin, Gwyn, Stephen
We investigated the gas obscuration and host galaxy properties of active galactic nuclei (AGN) during the peak of cosmic accretion growth of supermassive black holes (SMBHs) at redshift 0.8-1.8 using X-ray detected AGN with mid-infrared and far-infra
Externí odkaz:
http://arxiv.org/abs/2403.06409
Autor:
Pouliasis, E., Ruiz, A., Georgantopoulos, I., Vito, F., Gilli, R., Vignali, C., Ueda, Y., Koulouridis, E., Akiyama, M., Marchesi, S., Laloux, B., Nagao, T., Paltani, S., Pierre, M., Toba, Y., Habouzit, M., Vijarnwannaluk, B., Garrel, C.
Publikováno v:
A&A 685, A97 (2024)
The XLF of AGN offers a robust tool to study the evolution and the growth of SMBHs over cosmic time. Owing to the limited area probed by X-ray surveys, optical surveys are routinely used to probe the accretion in the high redshift Universe $z\geq 3$.
Externí odkaz:
http://arxiv.org/abs/2401.13515
Autor:
Mountrichas, G., Viitanen, A., Carrera, F. J., Stiele, H., Ruiz, A., Georgantopoulos, I., Mateos, S., Corral, A.
In this work, we compare the SMBH and host galaxy properties of X-ray obscured and unobscured AGN. For that purpose, we use $\sim 35 000$ X-ray detected AGN in the 4XMM-DR11 catalogue for which there are available measurements for their X-ray spectra
Externí odkaz:
http://arxiv.org/abs/2401.00045
Autor:
Mountrichas, G., Georgantopoulos, I.
In this study, our primary objective is to compare the properties of SMBH and their host galaxies between type 1 and type 2 AGN. In our analysis, we use X-ray detected sources in two fields, namely the eFEDS and the COSMOS-Legacy. To classify the X-r
Externí odkaz:
http://arxiv.org/abs/2312.11609
The recent serendipitous discovery of a new population of short duration X-ray transients, thought to be associated with collisions of compact objects or stellar explosions in distant galaxies, has motivated efforts to build up statistical samples by
Externí odkaz:
http://arxiv.org/abs/2310.19940
Autor:
Webb, Natalie A., Carrera, Francisco J., Schwope, Axel, Motch, Christian, Ballet, Jean, Watson, Mike, Page, Mat, Freyberg, Michael, Georgantopoulos, Ioannis, Coriat, Mickael, Barret, Didier, Massida, Zoe, Gupta, Maitrayee, Tranin, Hugo, Quintin, Erwan, Ceballos, M. Teresa, Mateos, Silvia, Corral, Amalia, Dominguez, Rosa, Stiele, Holger, Traulsen, Iris, Pires, Adriana, Nebot, Ada, Michel, Laurent, Pineau, François Xavier, Kuutila, Jere, Maggi, Pierre, Chakroborty, Sudip, Birchall, Keir, Kuin, Paul, Akylas, Athanassios, Ruiz, Angel, Pouliasis, Ektoras, Georgakakis, Antonis
XMM-Newton, a European Space Agency observatory, has been observing the X-ray, ultra-violet and optical sky for 23 years. During this time, astronomy has evolved from mainly studying single sources to populations and from a single wavelength, to mult
Externí odkaz:
http://arxiv.org/abs/2303.10097
Autor:
Georgantopoulos, I., Pouliasis, E., Mountrichas, G., Van der Wel, A., Marchesi, S., Lanzuisi, G.
Publikováno v:
A&A 673, A67 (2023)
We explore the properties of the host galaxies of X-ray selected AGN in the COSMOS field using the Chandra Legacy sample and the LEGA-C survey VLT optical spectra. Our main goal is to compare the relative ages of the host galaxies of the obscured and
Externí odkaz:
http://arxiv.org/abs/2302.00530