Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Migkas, K."'
Autor:
Pandya, A., Migkas, K., Reiprich, T. H., Stanford, A., Pacaud, F., Schellenberger, G., Lovisari, L., Ramos-Ceja, M. E., Nguyen-Dang, N. T., Park, S.
In standard cosmology, the late Universe is assumed to be statistically homogeneous and isotropic. However, a recent study based on galaxy clusters by Migkas et al. (2021, arXiv:2103.13904) found an apparent spatial variation of approximately $9\%$ i
Externí odkaz:
http://arxiv.org/abs/2408.00726
Autor:
Liu, A., Bulbul, E., Kluge, M., Ghirardini, V., Zhang, X., Sanders, J. S., Artis, E., Bahar, Y. E., Balzer, F., Brueggen, M., Clerc, N., Comparat, J., Garrel, C., Gatuzz, E., Grandis, S., Lamer, G., Merloni, A., Migkas, K., Nandra, K., Predehl, P., Ramos-Ceja, M. E., Reiprich, T. H., Seppi, R., Zelmer, S.
Superclusters of galaxies mark the large-scale overdense regions in the Universe. Superclusters provide an ideal environment to study structure formation and to search for the emission of the intergalactic medium such as cosmic filaments and WHIM. In
Externí odkaz:
http://arxiv.org/abs/2402.08454
Autor:
Bulbul, E., Liu, A., Kluge, M., Zhang, X., Sanders, J. S., Bahar, Y. E., Ghirardini, V., Artis, E., Seppi, R., Garrel, C., Ramos-Ceja, M. E., Comparat, J., Balzer, F., Böckmann, K., Brüggen, M., Clerc, N., Dennerl, K., Dolag, K., Freyberg, M., Grandis, S., Gruen, D., Kleinebreil, F., Krippendorf, S., Lamer, G., Merloni, A., Migkas, K., Nandra, K., Pacaud, F., Predehl, P., Reiprich, T. H., Schrabback, T., Veronica, A., Weller, J., Zelmer, S.
Clusters of galaxies can be used as powerful probes to study astrophysical processes on large scales, test theories of the growth of structure, and constrain cosmological models. The driving science goal of the SRG/eROSITA All-Sky Survey (eRASS) is t
Externí odkaz:
http://arxiv.org/abs/2402.08452
Autor:
Migkas, K., Kox, D., Schellenberger, G., Veronica, A., Pacaud, F., Reiprich, T. H., Bahar, Y. E., Balzer, F., Bulbul, E., Comparat, J., Dennerl, K., Freyberg, M., Garrel, C., Ghirardini, V., Grandis, S., Kluge, M., Liu, A., Ramos-Ceja, M. E., Sanders, J., Zhang, X.
Publikováno v:
A&A 688, A107 (2024)
Galaxy cluster gas temperatures ($T$) play a crucial role in many cosmological and astrophysical studies. However, it has been shown that $T$ measurements can vary between different X-ray telescopes. These $T$ biases can propagate to several cluster
Externí odkaz:
http://arxiv.org/abs/2401.17297
Autor:
Dietl, J., Pacaud, F., Reiprich, T. H., Veronica, A., Migkas, K., Spinelli, C., Dolag, K., Seidel, B.
The new Spectrum Roentgen Gamma (SRG)/eROSITA X-ray telescope has a superior response to extended soft X-rays in terms of effective area, energy resolution, and field-of-view (FoV). This makes SRG/eROSITA ideal for studying low X-ray surface brightne
Externí odkaz:
http://arxiv.org/abs/2401.17281
Autor:
Merloni, A., Lamer, G., Liu, T., Ramos-Ceja, M. E., Brunner, H., Bulbul, E., Dennerl, K., Doroshenko, V., Freyberg, M. J., Friedrich, S., Gatuzz, E., Georgakakis, A., Haberl, F., Igo, Z., Kreykenbohm, I., Liu, A., Maitra, C., Malyali, A., Mayer, M. G. F., Nandra, K., Predehl, P., Robrade, J., Salvato, M., Sanders, J. S., Stewart, I., Tubín-Arenas, D., Weber, P., Wilms, J., Arcodia, R., Artis, E., Aschersleben, J., Avakyan, A., Aydar, C., Bahar, Y. E., Balzer, F., Becker, W., Berger, K., Boller, T., Bornemann, W., Brüggen, M., Brusa, M., Buchner, J., Burwitz, V., Camilloni, F., Clerc, N., Comparat, J., Coutinho, D., Czesla, S., Dannhauer, S. M., Dauner, L., Dauser, T., Dietl, J., Dolag, K., Dwelly, T., Egg, K., Ehl, E., Freund, S., Friedrich, P., Gaida, R., Garrel, C., Ghirardini, V., Gokus, A., Grünwald, G., Grandis, S., Grotova, I., Gruen, D., Gueguen, A., Hämmerich, S., Hamaus, N., Hasinger, G., Haubner, K., Homan, D., Chitham, J. Ider, Joseph, W. M., Joyce, A., König, O., Kaltenbrunner, D. M., Khokhriakova, A., Kink, W., Kirsch, C., Kluge, M., Knies, J., Krippendorf, S., Krumpe, M., Kurpas, J., Li, P., Liu, Z., Locatelli, N., Lorenz, M., Müller, S., Magaudda, E., Mannes, C., McCall, H., Meidinger, N., Michailidis, M., Migkas, K., Muñoz-Giraldo, D., Musiimenta, B., Nguyen-Dang, N. T., Ni, Q., Olechowska, A., Ota, N., Pacaud, F., Pasini, T., Perinati, E., Pires, A. M., Pommranz, C., Ponti, G., Poppenhaeger, K., Pühlhofer, G., Rau, A., Reh, M., Reiprich, T. H., Roster, W., Saeedi, S., Santangelo, A., Sasaki, M., Schmitt, J., Schneider, P. C., Schrabback, T., Schuster, N., Schwope, A., Seppi, R., Serim, M. M., Shreeram, S., Sokolova-Lapa, E., Starck, H., Stelzer, B., Stierhof, J., Suleimanov, V., Tenzer, C., Traulsen, I., Trümper, J., Tsuge, K., Urrutia, T., Veronica, A., Waddell, S. G. H., Willer, R., Wolf, J., Yeung, M. C. H., Zainab, A., Zangrandi, F., Zhang, X., Zhang, Y., Zheng, X.
Publikováno v:
A&A, vol. 682, A34 (2024)
The eROSITA telescope array aboard the Spektrum Roentgen Gamma (SRG) satellite began surveying the sky in December 2019, with the aim of producing all-sky X-ray source lists and sky maps of an unprecedented depth. Here we present catalogues of both p
Externí odkaz:
http://arxiv.org/abs/2401.17274
Autor:
Ota, N., Nguyen-Dang, N. T., Mitsuishi, I., Oguri, M., Klein, M., Okabe, N., Ramos-Ceja, M. E., Reiprich, T. H., Pacaud, F., Bulbul, E., Brüggen, M., Liu, A., Migkas, K., Chiu, I., Ghirardini, V., Grandis, S., Lin, Y. -T., Miyatake, H., Miyazaki, S., Sanders, J. S.
Publikováno v:
A&A 669, A110 (2023)
We present the results of a systematic X-ray analysis of optically rich galaxy clusters detected by the Subaru HSC survey in the eROSITA eFEDS field. Through a joint analysis of SRG/eROSITA and Subaru/HSC surveys, we aim to study the dynamical status
Externí odkaz:
http://arxiv.org/abs/2206.09536
Autor:
Iljenkarevic, J., Reiprich, T. H., Pacaud, F., Veronica, A., Whelan, B., Aschersleben, J., Migkas, K., Bulbul, E., Sanders, J. S., Ramos-Ceja, M. E., Liu, T., Ghirardini, V., Liu, A., Boller, T.
Publikováno v:
A&A 661, A26 (2022)
The X-ray telescope eROSITA onboard the newly launched SRG mission serendipitously observed the galaxy cluster A3408 ($z=0.0420$) during the PV observation of the AGN 1H0707-495. Despite its brightness and large extent, it has not been observed by an
Externí odkaz:
http://arxiv.org/abs/2106.14544
Autor:
Whelan, B., Veronica, A., Pacaud, F., Reiprich, T. H., Bulbul, E., Ramos-Ceja, M. E., Sanders, J. S., Aschersleben, J., Iljenkarevic, J., Migkas, K., Freyberg, M., Dennerl, K., Kara, M., Liu, A., Ghirardini, V., Ota, N.
Publikováno v:
A&A 663, A171 (2022)
The most nearby clusters are the best places to study physical and enrichment effects in the faint cluster outskirts. A3158 located at z=0.059 is quite extended with a characteristic radius r$_{200}$=23.95 arcmin. In 2019, A3158 was observed as a cal
Externí odkaz:
http://arxiv.org/abs/2106.14545
Autor:
Migkas, K., Pacaud, F., Schellenberger, G., Erler, J., Nguyen-Dang, N. T., Reiprich, T. H., Ramos-Ceja, M. E., Lovisari, L.
Publikováno v:
A&A 649, A151 (2021)
The hypothesis that the late Universe is isotropic and homogeneous is adopted by most cosmological studies. The expansion rate $H_0$ is thought to be spatially constant, while bulk flows are often presumed to be negligible compared to the Hubble expa
Externí odkaz:
http://arxiv.org/abs/2103.13904