Zobrazeno 1 - 10
of 80
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 $\rm z \geq3.
Externí odkaz:
http://arxiv.org/abs/2206.13935
Autor:
Sokolovsky K., Bonanos A., Gavras P., Yang M., Hatzidimitriou D., Moretti M.I., Karampelas A., Bellas-Velidis I., Spetsieri Z., Pouliasis E., Georgantopoulos I., Charmandaris V., Tsinganos K., Laskaris N., Kakaletris G., Nota A., Lennon D., Arviset C., Whitmore B., Budavari T., Downes R., Lubow S., Rest A., Strolger L., White R.
Publikováno v:
EPJ Web of Conferences, Vol 152, p 02005 (2017)
We aim to construct an exceptionally deep (V ≲ 27) catalog of variable objects in selected Galactic and extragalactic fields visited multiple times by the Hubble Space Telescope (HST). While HST observations of some of these fields were searched fo
Externí odkaz:
https://doaj.org/article/58fd053d631a4420a5b3ab753f29f080
Autor:
Pouliasis, E., Georgantopoulos, I., Ruiz, A., Gilli, R., Koulouridis, E., Akiyama, M., Ueda, Y., Chiappetti, L., Garrel, C., Horellou, C., Nagao, T., Paltani, S., Pierre, M., Toba, Y., Vignali, C.
Publikováno v:
A&A 658, A175 (2022)
X-rays offer a reliable method to identify Active Galactic Nuclei (AGN). However, in the high-redshift Universe X-ray AGN are poorly sampled due to their relatively low space density and the small areas covered by X-ray surveys. In addition to wide-a
Externí odkaz:
http://arxiv.org/abs/2111.04659
Publikováno v:
A&A 658, A35 (2022)
We study the host galaxy properties of active galactic nuclei (AGN) that have been detected in X-rays in the nearby Universe ($\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