Zobrazeno 1 - 10
of 79
pro vyhledávání: '"Pouliasis, E"'
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:
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:
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 $\rm z \geq3.
Externí odkaz:
http://arxiv.org/abs/2206.13935
Autor:
Pouliasis, E., Georgantopoulos, I., Ruiz, A., Gilli, R., Koulouridis, E., Akiyama, M., Ueda, Y., Chiappetti, L., Garrel, C., Horellou, C., Nagao, T., Paltani, S., Pierre, M., Toba, Y., Vignali, C.
Publikováno v:
A&A 658, A175 (2022)
X-rays offer a reliable method to identify Active Galactic Nuclei (AGN). However, in the high-redshift Universe X-ray AGN are poorly sampled due to their relatively low space density and the small areas covered by X-ray surveys. In addition to wide-a
Externí odkaz:
http://arxiv.org/abs/2111.04659
Publikováno v:
A&A 658, A35 (2022)
We study the host galaxy properties of active galactic nuclei (AGN) that have been detected in X-rays in the nearby Universe ($\rm z<0.2$). For that purpose, we use the catalogue provided by the ROSAT-2RXS in the 0.1-2.4\,keV energy band, one of the
Externí odkaz:
http://arxiv.org/abs/2111.02539
The detection of X-ray emission constitutes a reliable and efficient tool for the selection of Active Galactic Nuclei (AGNs), although it may be biased against the most heavily absorbed AGNs. Simple mid-IR broad-band selection criteria identify a lar
Externí odkaz:
http://arxiv.org/abs/2005.02361
Autor:
Bonanos, A. Z., Yang, M., Sokolovsky, K. V., Gavras, P., Hatzidimitriou, D., Bellas-Velidis, I., Kakaletris, G., Lennon, D. J., Nota, A., White, R. L., Whitmore, B. C., Anastasiou, K. A., Arévalo, M., Arviset, C., Baines, D., Budavari, T., Charmandaris, V., Chatzichristodoulou, C., Dimas, E., Durán, J., Georgantopoulos, I., Karampelas, A., Laskaris, N., Lianou, S., Livanis, A., Lubow, S., Manouras, G., Moretti, M. I., Paraskeva, E., Pouliasis, E., Rest, A., Salgado, J., Sonnentrucker, P., Spetsieri, Z. T., Taylor, P., Tsinganos, K.
The Hubble Space Telescope (HST) has obtained multi-epoch observations providing the opportunity for a comprehensive variability search aiming to uncover new variables. We have therefore undertaken the task of creating a catalog of variable sources b
Externí odkaz:
http://arxiv.org/abs/1909.10757
Autor:
Pouliasis, E., Georgantopoulos, I., Bonanos, A. Z., Yang, M., Sokolovsky, K. V., Hatzidimitriou, D., Mountrichas, G., Gavras, P., Charmandaris, V., Bellas-Velidis, I., Spetsieri, Z. T., Tsinganos, K.
Identifying Active Galactic Nuclei (AGNs) through their X-ray emission is efficient, but necessarily biased against X-ray-faint objects. We aim to characterize this bias by comparing X-ray-selected AGNs to the ones identified through optical variabil
Externí odkaz:
http://arxiv.org/abs/1905.11995