Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Grotova, I."'
Autor:
Krishnan, S., Markowitz, A. G., Krumpe, M., Homan, D., Brogan, R., Haemmerich, S., Gromadzki, M., Saha, T., Schramm, M., Reichart, D. E., Winkler, H., Waddell, S., Wilms, J., Rau, A., Liu, Z., Grotova, I.
Extreme continuum variability in AGNs can indicate extreme changes in accretion flows onto supermassive black holes. We explore the multiwavelength nature of a continuum flare in the Seyfert LCRS B040659.9$-$385922. The all-sky X-ray surveys conducte
Externí odkaz:
http://arxiv.org/abs/2409.16060
Autor:
Goodwin, A. J., Anderson, G. E., Miller-Jones, J. C. A., Malyali, A., Grotova, I., Homan, D., Kawka, A., Krumpe, M., Liu, Z., Rau, A.
We present an extensive radio monitoring campaign of the nuclear transient eRASSt J234403-352640 with the Australia Telescope Compact Array, one of the most X-ray luminous TDE candidates discovered by the SRG/eROSITA all-sky survey. The observations
Externí odkaz:
http://arxiv.org/abs/2401.17286
Autor:
Boller, Th., Freyberg, M., Buchner, J., Haberl, F., Maitra, C., Schwope, A., Robrade, J., Rau, A., Grotova, I., Waddell, S., Ni, Q., Salvato, M., Krumpe, M., Georgakakis, A., Merloni, A., Nandra, K.
The extended ROentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spectrum-Roentgen-Gamma (SRG) mission with its first All-Sky Survey (eRASS1) has offered an unprecedented, comprehensive view of the variable X-ray sky. With enhanced
Externí odkaz:
http://arxiv.org/abs/2401.17280
Autor:
Arcodia, R., Liu, Z., Merloni, A., Malyali, A., Rau, A., Chakraborty, J., Goodwin, A., Buckley, D., Brink, J., Gromadzki, M., Arzoumanian, Z., Buchner, J., Kara, E., Nandra, K., Ponti, G., Salvato, M., Anderson, G., Baldini, P., Grotova, I., Krumpe, M., Maitra, C., Miller-Jones, J. C. A., Ramos-Ceja, M. E.
X-ray quasi-periodic eruptions (QPEs) are a novel addition to the group of extragalactic transients. In this work, we report the discovery of two further galaxies showing QPEs, eRO-QPE3 and eRO-QPE4, with the eROSITA X-ray telescope on board the Spec
Externí odkaz:
http://arxiv.org/abs/2401.17275
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:
Liu, Zhu, Ryu, Taeho, Goodwin, A. J., Rau, A., Homan, D., Krumpe, M., Merloni, A., Grotova, I., Anderson, G. E., Malyali, A., Miller-Jones, J. C. A.
Publikováno v:
A&A 683, L13 (2024)
In this letter, we present the results from further X-ray and UV observations of the nuclear transient eRASSt J045650.3-203750 (hereafter J0456-20). We detected five repeating X-ray and UV flares from J0456-20, making it one of the most promising rep
Externí odkaz:
http://arxiv.org/abs/2401.14091
Autor:
Malyali, A., Rau, A., Bonnerot, C., Goodwin, A. J., Liu, Z., Anderson, G. E., Brink, J., Buckley, D. A. H., Merloni, A., Miller-Jones, J. C. A., Grotova, I., Kawka, A.
We report on the SRG/eROSITA detection of ultra-soft ($kT=47^{+5}_{-5}$ eV) X-ray emission ($L_{\mathrm{X}}=2.5^{+0.6}_{-0.5} \times 10^{43}$ erg s$^{-1}$) from the tidal disruption event (TDE) candidate AT 2022dsb $\sim$14 days before peak optical b
Externí odkaz:
http://arxiv.org/abs/2309.16336
Autor:
Saha, T., Markowitz, A., Homan, D., Krumpe, M., Haemmerich, S., Czerny, B., Graham, M., Frederick, S., Gromadzki, M., Gezari, S., Winkler, H., Buckley, D. A. H., Brink, J., Naddaf, M. H., Rau, A., Wilms, J., Gokus, A., Liu, Z., Grotova, I.
Context. Multiwavelength studies of transients in actively accreting supermassive black holes have revealed that large-amplitude variability is frequently linked to significant changes in the optical spectra -- a phenomenon referred to as changing-lo
Externí odkaz:
http://arxiv.org/abs/2309.08956
Autor:
Kammoun, E. S., Igo, Z., Miller, J. M., Fabian, A. C., Reynolds, M. T., Merloni, A., Barret, D., Nardini, E., Petrucci, P. -O., Piconcelli, E., Barnier, S., Buchner, J., Dwelly, T., Grotova, I., Krumpe, M., Liu, T., Nandra, K., Rau, A., Salvato, M., Urrutia, T., Wolf, J.
SMSS\,J114447.77-430859.3 ($z=0.83$) has been identified in the SkyMapper Southern Survey as the most luminous quasar in the last $\sim 9\,\rm Gyr$. In this paper, we report on the eROSITA/Spectrum-Roentgen-Gamma (SRG) observations of the source from
Externí odkaz:
http://arxiv.org/abs/2305.10745
Autor:
Homan, D., Krumpe, M., Markowitz, A., Saha, T., Gokus, A., Partington, E., Lamer, G., Malyali, A., Liu, Z., Rau, A., Grotova, I., Cackett, E. M., Buckley, D. A. H., Ciroi, S., Di Mille, F., Gendreau, K., Gromadzki, M., Krishnan, S., Schramm, M., Steiner, J. F.
In November 2020, a new, bright object, eRASSt J234402.9$-$352640, was discovered in the second all-sky survey of SRG/eROSITA. The object brightened by a factor of at least 150 in 0.2--2.0 keV flux compared to an upper limit found six months previous
Externí odkaz:
http://arxiv.org/abs/2302.06989