Zobrazeno 1 - 10
of 361
pro vyhledávání: '"Arav, N"'
Autor:
Bischetti, M., Feruglio, C., D'Odorico, V., Arav, N., Bañados, E., Becker, G., Bosman, S. E. I., Carniani, S., Cristiani, S., Cupani, G., Davies, R., Eilers, A. C., Farina, E. P., Ferrara, A., Maiolino, R., Mazzucchelli, C., Mesinger, A., Meyer, R., Onoue, M., Piconcelli, E., Ryan-Weber, E., Schindler, J-T., Wang, F., Yang, J., Zhu, Y., Fiore, F.
Publikováno v:
Nature, 605, 244-247 (2022)
Luminous quasars powered by accretion onto billion solar mass black holes already exist at the epoch of Reionisation, when the Universe was 0.5-1 Gyr old. These objects likely reside in over-dense regions of the Universe, and will grow to form today'
Externí odkaz:
http://arxiv.org/abs/2205.00021
Autor:
Mehdipour, M., Kriss, G. A., Kaastra, J. S., Wang, Y., Mao, J., Costantini, E., Arav, N., Behar, E., Bianchi, S., Branduardi-Raymont, G., Brotherton, M., Cappi, M., De Marco, B., Di Gesu, L., Ebrero, J., Grafton-Waters, S., Kaspi, S., Matt, G., Paltani, S., Petrucci, P. -O., Pinto, C., Ponti, G., Ursini, F., Walton, D. J.
Publikováno v:
A&A 652, A150 (2021)
From Swift monitoring of a sample of active galactic nuclei (AGN) we found a transient X-ray obscuration event in Seyfert-1 galaxy NGC 3227, and thus triggered our joint XMM-Newton, NuSTAR, and Hubble Space Telescope (HST) observations to study this
Externí odkaz:
http://arxiv.org/abs/2106.14957
Autor:
Williams, P. R., Pancoast, A., Treu, T., Brewer, B. J., Peterson, B. M., Barth, A. J., Malkan, M. A., De Rosa, G., Horne, Keith, Kriss, G. A., Arav, N., Bentz, M. C., Cackett, E. M., Bontà, E. Dalla, Dehghanian, M., Done, C., Ferland, G. J., Grier, C. J., Kaastra, J., Kara, E., Kochanek, C. S., Mathur, S., Mehdipour, M., Pogge, R. W., Proga, D., Vestergaard, M., Waters, T., Adams, S. M., Anderson, M. D., Arévalo, P., Beatty, T. G., Bennert, V. N., Bigley, A., Bisogni, S., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brandt, W. N., Breeveld, A. A., Brotherton, M., Brown, J. E., Brown, J. S., Canalizo, G., Carini, M. T., Clubb, K. I., Comerford, J. M., Corsini, E. M., Crenshaw, D. M., Croft, S., Croxall, K. V., Deason, A. J., De Lorenzo-Cáceres, A., Denney, K. D., Dietrich, M., Edelson, R., Efimova, N. V., Ely, J., Evans, P. A., Fausnaugh, M. M., Filippenko, A. V., Flatland, K., Fox, O. D., Gardner, E., Gates, E. L., Gehrels, N., Geier, S., Gelbord, J. M., Gonzalez, L., Gorjian, V., Greene, J. E., Grupe, D., Gupta, A., Hall, P. B., Henderson, C. B., Hicks, S., Holmbeck, E., Holoien, T. W. -S., Hutchison, T., Im, M., Jensen, J. J., Johnson, C. A., Joner, M. D., Jones, J., Kaspi, S., Kelly, P. L., Kennea, J. A., Kim, M., Kim, S., Kim, S. C., King, A., Klimanov, S. A., Knigge, C., Krongold, Y., Lau, M. W., Lee, J. C., Leonard, D. C., Li, Miao, Lira, P., Lochhaas, C., Ma, Zhiyuan, Manne-Nicholas, E. R., MacInnis, F., Mauerhan, J. C., McGurk, R., Hardy, I. M. Mc, Montuori, C., Morelli, L., Mosquera, A., Mudd, D., Müller-Sánchez, F., Nazarov, S. V., Norris, R. P., Nousek, J. A., Nguyen, M. L., Ochner, P., Okhmat, D. N., Papadakis, I., Parks, J. R., Pei, L., Penny, M. T., Pizzella, A., Poleski, R., Pott, J. -U., Rafter, S. E., Rix, H. -W., Runnoe, J., Saylor, D. A., Schimoia, J. S., Scott, B., Sergeev, S. G., Shappee, B. J., Shivvers, I., Siegel, M., Simonian, G. V., Siviero, A., Skielboe, A., Somers, G., Spencer, M., Starkey, D., Stevens, D. J., Sung, H. -I., Tayar, J., Tejos, N., Turner, C. S., Uttley, P., Van Saders, J., Vaughan, S. A., Vican, L., Villanueva Jr., S., Villforth, C., Weiss, Y., Woo, J. -H., Yan, H., Young, S., Yuk, H., Zheng, W., Zhu, W., Zu, Y.
We present geometric and dynamical modeling of the broad line region for the multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The dataset includes photometric and spectroscopic monitoring in the optical and ultraviolet, co
Externí odkaz:
http://arxiv.org/abs/2010.00594
Autor:
De Marco, B., Adhikari, T. P., Ponti, G., Bianchi, S., Kriss, G. A., Arav, N., Behar, E., Branduardi-Raymont, G., Cappi, M., Costantini, E., Costanzo, D., di Gesu, L., Ebrero, J., Kaastra, J. S., Kaspi, S., Mao, J., Markowitz, A., Matt, G., Mehdipour, M., Middei, R., Paltani, S., Petrucci, P. O., Pinto, C., Różańska, A., Walton, D. J.
Publikováno v:
A&A 634, A65 (2020)
Context. Obscuration events caused by outflowing clumps or streams of high column density, low ionisation gas, heavily absorbing the X-ray continuum, have been witnessed in a number of Seyfert galaxies. Aims. We report on the X-ray spectral-timing an
Externí odkaz:
http://arxiv.org/abs/1911.12772
Autor:
Arav, N., Xu, X., Kriss, G. A., Chamberlain, C., Miller, T., Behar, E., Kaastra, J. S., Ely, J. C., Peretz, U., Mehdipour, M., Branduardi-Raymont, G., Bianchi, S., Cappi, M., Costantini, E., De Marco, B., di Gesu, L., Ebrero, J., Kaspi, S., Middei, R., Petrucci, P. -O., Ponti, G.
Aims. Our aim is to determine the distance of the UV outflow components from the central source, their abundances and total column density, and the mechanism responsible for their observed absorption variability. Methods. We studied the UV spectra ac
Externí odkaz:
http://arxiv.org/abs/1910.11249
Autor:
Dehghanian, M., Ferland, G. J., Peterson, B. M., Kriss, G. A., Korista, K. T., Chatzikos, M., Guzman, F., Arav, N., De Rosa, G., Goad, M. R., Mehdipour, M., Van Hoof, P. A. M.
The 180-day Space Telescope and Optical Reverberation Mapping campaign on NGC 5548 discovered an anomalous period, the broad-line region (BLR) holiday, in which the emission lines decorrelated from the continuum variations. This is important since th
Externí odkaz:
http://arxiv.org/abs/1908.07686
Autor:
Kriss, G. A., De Rosa, G., Ely, J., Peterson, B. M., Kaastra, J., Mehdipour, M., Ferland, G. J., Dehghanian, M., Mathur, S., Edelson, R., Korista, K. T., Arav, N., Barth, A. J., Bentz, M. C., Brandt, W. N., Crenshaw, D. M., Bontà, E. Dalla, Denney, K. D., Done, C., Eracleous, M., Fausnaugh, M. M., Gardner, E., Goad, M. R., Grier, C. J., Horne, Keith, Kochanek, C. S., Mchardy, I. M., Netzer, H., Pancoast, A., Pei, L., Pogge, R. W., Proga, D., Silva, C., Tejos, N., Vestergaard, M., Adams, S. M., Anderson, M. D., Arévalo, P., Beatty, T G., Behar, E., Bennert, V. N., Bianchi, S., Bigley, A., Bisogni, S., Boissay-Malaquin, R., Borman, G. A., Bottorff, M. C., Breeveld, A. A., Brotherton, M., Brown, J. E., Brown, J. S., Cackett, E. M., Canalizo, G., Cappi, M., Carini, M. T., Clubb, K. I., Comerford, J. M., Coker, C. T., Corsini, E. M., Costantini, E., Croft, S., Croxall, K. V., Deason, A. J., De Lorenzo-Cáceres, A., De Marco, B., Dietrich, M., Di Gesu, L., Ebrero, J., Evans, P. A., Filippenko, A. V., Flatland, K., Gates, E. L., Gehrels, N., Geier, Z S., Gelbord, J. M., Gonzalez, L., Gorjian, V., Grupe, D., Gupta, A., Hall, P. B., Henderson, C. B., Hicks, S., Holmbeck, E., Holoien, T. W. -S., Hutchison, T. A., Im, M., Jensen, J. J., Johnson, C. A., Joner, M. D., Kaspi, S., Kelly, B. C., Kelly, P. L., Kennea, J. A., Kim, M., Kim, S. C., Kim, S. Y., King, A., Klimanov, S. A., Krongold, Y., Lau, M. W., Lee, J. C., Leonard, D. C., Li, Miao, Lira, P., Lochhaas, C., Ma, Zhiyuan, Macinnis, F., Malkan, M. A., Manne-Nicholas, E. R., Matt, G., Mauerhan, J. C., Mcgurk, R., Montuori, C., Morelli, L., Mosquera, A., Mudd, D., Müller-Sánchez, F., Nazarov, S. V., Norris, R. P., Nousek, J. A., Nguyen, M. L., Ochner, P., Okhmat, D. N., Paltani, S., Parks, J. R., Pinto, C., Pizzella, A., Poleski, R., Ponti, G., Pott, J. -U., Rafter, S. E., Rix, H. -W., Runnoe, J., Saylor, D. A., Schimoia, J. S., Schnülle, K., Scott, B., Sergeev, S. G., Shappee, B. J., Shivvers, I., Siegel, M., Simonian, G. V., Siviero, A., Skielboe, A., Somers, G., Spencer, M., Starkey, D., Stevens, D. J., Sung, H. -I., Tayar, J., Teems, K. G., Treu, T., Turner, C. S., Uttley, P., Van Saders, J ., Vican, L., Villforth, C., Villanueva Jr., S., Walton, D. J., Waters, T., Weiss, Y., Woo, J. -H., Yan, H., Yuk, H., Zheng, W., Zhu, W., Zu, Y.
We model the ultraviolet spectra of the Seyfert 1 galaxy NGC~5548 obtained with the Hubble Space Telescope during the 6-month reverberation-mapping campaign in 2014. Our model of the emission from NGC 5548 corrects for overlying absorption and deblen
Externí odkaz:
http://arxiv.org/abs/1907.03874
Autor:
Grafton-Waters, S., Branduardi-Raymont, G., Mehdipour, M., Page, M. J., Behar, E., Kaastra, J., Arav, N., Bianchi, S., Costantini, E., Ebrero, J., Di Gesu, L., Kaspi, S., Kriss, G. A., De Marco, B., Mao, J., Middei, R., Peretz, U., Petrucci, P. -O., Ponti, G.
Publikováno v:
A&A 633, A62 (2020)
Aims. We aim to investigate and characterise the photoionised X-ray emission line regions within NGC 7469. Methods. We apply the photoionisation model, PION, within the spectral fitting code SPEX to analyse the 640 ks RGS spectrum of NGC 7469 gathere
Externí odkaz:
http://arxiv.org/abs/1907.01946
Autor:
Kriss, G. A., Arav, N., Edmonds, D., Ely, J., Kaastra, J. S., Bianchi, S., Cappi, M., Costantini, E., Ebrero, J., Mehdipour, M., Paltani, S., Petrucci, P., Ponti, G.
Publikováno v:
A&A 623, A82 (2019)
To elucidate the location, physical conditions, mass outflow rate, and kinetic luminosity of the outflow from the active nucleus of the Seyfert 1 galaxy Mrk 509 we used coordinated ultraviolet and X-ray spectral observations in 2012 to follow up our
Externí odkaz:
http://arxiv.org/abs/1901.07432
Autor:
Dehghanian, M., Ferland, G. J., Kriss, G. A., Peterson, B. M., Mathur, S., Mehdipour, M., Guzman, F., Chatzikos, M., Van Hoof, P. A. M., Williams, R. J. R., Arav, N., Barth, A. J., Bentz, M. C., Bisogni, S., Brandt, W. N., Crenshaw, D. M., Bonta, E. Dalla, De Rosa, G., Fausnaugh, M. M., Gelbord, J. M., Goad, M. R., Gupta, A., Horne, Keith, Kaastra, J., Knigge, C., Korista, K. T., Hardy, I. M. Mc, Pogge, R. W., Starkey, D. A., Vestergaard, M.
The flux variations in the emission lines in active galactic nuclei (AGNs) are driven by variations in the ionizing continuum flux --which are usually reflected in the observable UV-optical continuum. The "Reverberation mapping" technique measures th
Externí odkaz:
http://arxiv.org/abs/1812.11578