Zobrazeno 1 - 10
of 153
pro vyhledávání: '"Cracco V."'
Publikováno v:
Open Astronomy, Vol 20, Iss 3, Pp 442-447 (2011)
In this contribution we report on the study of the optical emission lines and X-ray spectra of a sample of Type 1 AGNs, collected from the SDSS database and observed by the XMM-Newton satellite. Using different instruments onboard XMM, we identify th
Externí odkaz:
https://doaj.org/article/8b2d4400da2b4e8aa88547ffa44f7b30
Publikováno v:
Open Astronomy, Vol 20, Iss 3, Pp 419-426 (2011)
Nuclear activity and star formation processes represent two key elements in the evolution of galaxies across the cosmic ages. In spite of very different physical backgrounds, several arguments suggest that they should be closely connected. On the bas
Externí odkaz:
https://doaj.org/article/c38009a9dafe4a7b9c225668dc23fd3f
Autor:
Vietri, A., Berton, M., Ciroi, S., Congiu, E., La Mura, G., Cracco, V., Frezzato, M., Chen, S., Cattapan, A., Peruzzi, T., Rafanelli, P.
Narrow-line Seyfert 1 galaxies (NLS1s) are a subclass of active galactic nuclei (AGN). It is often believed that these AGN have small black hole mass, which is responsible for the narrowness of the permitted lines. They are also characterised by a hi
Externí odkaz:
http://arxiv.org/abs/1809.09901
Autor:
Chen, S., Berton, M., La Mura, G., Congiu, E., Cracco, V., Foschini, L., Fan, J. H., Ciroi, S., Rafanelli, P., Bastieri, D.
We present a new accurate sample of narrow-line Seyfert 1 galaxies (NLS1s) in the southern hemisphere from the Six-degree Field Galaxy Survey (6dFGS). Based on the optical spectral features, 167 sources were classified as NLS1s. We derived flux-calib
Externí odkaz:
http://arxiv.org/abs/1809.06459
Autor:
La Mura, G., Bastieri, D., Berton, M., Chen, S., Ciroi, S., Congiu, E., Cracco, V., Fan, J. -H., Rafanelli, P.
Thanks to the execution of extensive spectroscopic surveys that have covered large fractions of the sky down to magnitudes as faint as $i \approx 19$, it has been possible to identify several narrow-line Seyfert 1 galaxies (NLS1s) and to investigate
Externí odkaz:
http://arxiv.org/abs/1809.02373
Autor:
Zemko, P., Ciroi, S., Orio, M., Odendaal, A., Shugarov, S., Barsukova, E., Bianchini, A., Cracco, V., Gabdeev, M., Goranskij, V., Tofflemire, B., Valeev, A. F., Katisheva, N.
We have monitored the return to quiescence of novae previously observed in outburst as supersoft X-ray sources, with optical photometry of the intermediate polar (IP) V4743 Sgr and candidate IP V2491 Cyg, and optical spectroscopy of these two and sev
Externí odkaz:
http://arxiv.org/abs/1807.10321
Autor:
Berton, M., Congiu, E., Ciroi, S., Komossa, S., Frezzato, M., Di Mille, F., Antón, S., Antonucci, R., Caccianiga, A., Coppi, P., Järvelä, E., Kotilainen, J., Lähteenmäki, A., Mathur, S., Chen, S., Cracco, V., La Mura, G., Rafanelli, P.
Narrow-line Seyfert 1 galaxies (NLS1s) are a class of active galactic nuclei (AGN) which are known to be one of the few sources of $\gamma$ rays, which originate in a relativistic beamed jet. Becuase of their relatively large distance, a poorly inves
Externí odkaz:
http://arxiv.org/abs/1807.08953
Autor:
De Rosa, G., Fausnaugh, M. M., Grier, C. J., Peterson, B. M., Denney, K. D., Horne, Keith, Bentz, M. C., Ciroi, S., Bonta`, E. Dalla, Joner, M. D., Kaspi, S., Kochanek, C. S., Pogge, R. W., Sergeev, S. G., Vestergaard, M., Adams, S. M., Antognini, J., Salvo, C. Araya, Armstrong, E., Bae, J., Barth, A. J., Beatty, T. G., Bhattacharjee, A., Borman, G. A., Boroson, T. A., Bottorff, M. C., Brown, J. E., Brown, J. S., Brotherton, M. S., Coker, C. T., Clanton, C., Cracco, V., Crawford, S. M., Croxall, K. V., Eftekharzadeh, S., Eracleous, M., Fiorenza, S. L., Frassati, A., Hawkins, K., Henderson, C. B., Holoien, T. W. -S., Hutchison, T., Kellar, J., Kilerci-Eser, E., Kim, S., King, A. L., La Mura, G., Laney, C. D., Li, M., Lochhaas, C., Ma, Z., MacInnis, F., Manne-Nicholas, E. R., Mason, M., McGraw, S. M., Mogren, K., Montouri, C., Moody, J. W., Mosquera, A. M., Mudd, D., Musso, R., Nazarov, S. V., Nguyen, M. L., Ochner, P., Okhmat, D. N., Onken, C. A., Ou-Yang, B., Pancoast, A., Pei, L., Penny, M., Poleski, R., Portaluri, E., Prieto, J. -L., Price-Whelan, A. M., Pulatova, N. G., Rafter, S., Roettenbacher, R. M., Romero-Colmenero, E., Runnoe, J., Schimoia, J. S., Shappee, B. J., Sherf, N., Simonian, G. V., Siviero, A., Skowron, D. M., Skowron, J., Somers, G., Spencer, M., Starkey, D. A., Stevens, D. J., Stoll, R., Tamajo, E., Tayar, J., van Saders, J. L., Valenti, S., Villanueva, Jr., S., Villforth, C., Weiss, Y., Winkler, H., Zastrow, J., Zhu, W., Zu, Y.
We present the first results from a reverberation-mapping campaign undertaken during the first half of 2012, with additional data on one AGN (NGC 3227) from a 2014 campaign. Our main goals are (1) to determine the black hole masses from continuum-Hbe
Externí odkaz:
http://arxiv.org/abs/1807.04784
We investigated four luminous supersoft X-ray sources (SSS) in the Magellanic Clouds suspected to have optical counterparts of Be spectral type. If the origin of the X-rays is in a very hot atmosphere heated by hydrogen burning in accreted envelopes
Externí odkaz:
http://arxiv.org/abs/1806.08971
Autor:
Chen, S., Berton, M., La Mura, G., Congiu, E., Cracco, V., Foschini, L., Fan, J. H., Ciroi, S., Rafanelli, P., Bastieri, D.
Publikováno v:
A&A 615, A167 (2018)
We present a new accurate catalog of narrow-line Seyfert 1 galaxies (NLS1s) in the southern hemisphere from the Six-degree Field Galaxy Survey (6dFGS) final data release, which is currently the most extensive spectroscopic survey available in the sou
Externí odkaz:
http://arxiv.org/abs/1801.07234