Zobrazeno 1 - 10
of 808
pro vyhledávání: '"Georgantopoulos, I."'
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:
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:
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
Autor:
Paspaliaris, E. -D., Xilouris, E. M., Nersesian, A., Bianchi, S., Georgantopoulos, I., Masoura, V. A., Magdis, G. E., Plionis, M.
Publikováno v:
A&A 669, A11 (2023)
The general consensus is that LTGs undergo intense star-formation activity, while ETGs are mostly inactive. We question this general rule and investigate the existence of star-forming ETGs and quiescent LTGs in the local Universe. By computing the ph
Externí odkaz:
http://arxiv.org/abs/2209.13437
Autor:
Mountrichas, G., Buat, V., Yang, G., Boquien, M., Ni, Q., Pouliasis, E., Burgarella, D., Theule, P., Georgantopoulos, I.
Publikováno v:
A&A 667, A145 (2022)
We use AGN with $\rm L_{X} \sim 10^{42.5-44}\,erg\,s^{-1}$, from the COSMOS-Legacy survey that lie within the UltraVISTA region and cross match them with the LEGA-C catalogue. The latter provides measurements of the calcium break, D$_n$4000, and H$_\
Externí odkaz:
http://arxiv.org/abs/2209.06960
Autor:
Pouliasis, E., Mountrichas, G., Georgantopoulos, I., Ruiz, A., Gilli, R., Koulouridis, E., Akiyama, M., Ueda, Y., Garrel, C., Nagao, T., Paltani, S., Pierre, M., Toba, Y., Vignali, C.
Publikováno v:
A&A 667, A56 (2022)
In this work, we aimed at investigating the star formation rate of active galactic nuclei host galaxies in the early Universe. To this end, we constructed a sample of 149 luminous ($\rm L_{2-10keV} > 10^{44}\,erg\,s^{-1}$) X-ray AGNs at $\rm z \geq3.
Externí odkaz:
http://arxiv.org/abs/2206.13935