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pro vyhledávání: '"Mathur, S."'
Akademický článek
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Akademický článek
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Autor:
Valentini, M., Chiappini, C., Bossini, D., Miglio, A., Davies, G. R., Mosser, B., Elsworth, Y. P., Mathur, S., García, R. A., Girardi, L., Rodrigues, T. S., Steinmetz, M., Vallenari, A.
Publikováno v:
A&A 627, A173 (2019)
Very metal-poor halo stars are the best candidates for being among the oldest objects in our Galaxy. Samples of halo stars with age determination and detailed chemical composition measurements provide key information for constraining the nature of th
Externí odkaz:
http://arxiv.org/abs/1808.08569
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
The hyperluminous Compton-thick $z\sim2$ quasar nucleus of the hot DOG W1835+4355 observed by NuSTAR
Autor:
Zappacosta, L., Piconcelli, E., Duras, F., Vignali, C., Valiante, R., Bianchi, S., Bongiorno, A., Fiore, F., Feruglio, C., Lanzuisi, G., Maiolino, R., Mathur, S., Miniutti, G., Ricci, C.
Publikováno v:
A&A 618, A28 (2018)
We present a 155ks NuSTAR observation of the $z\sim2$ hot dust-obscured galaxy (hot DOG) W1835+4355. We extracted spectra from the two NuSTAR detectors and analyzed them jointly with the archival XMM PN and MOS spectra. We performed a spectroscopic a
Externí odkaz:
http://arxiv.org/abs/1807.06022
Autor:
Nicastro, F., Kaastra, J., Krongold, Y., Borgani, S., Branchini, E., Cen, R., Dadina, M., Danforth, C. W., Elvis, M., Fiore, F., Gupta, A., Mathur, S., Mayya, D., Paerels, F., Piro, L., Rosa-Gonzales, D., Schaye, J., Shull, J. M., Torres-Zafra, J., Wijers, N., Zappacosta, L.
Publikováno v:
Nature, 2018, Vol. 558, Issue 7710, pag. 406
It has been known for decades that the observed number of baryons in the local universe falls about 30-40% short of the total number of baryons predicted by Big-Bang Nucleosynthesis, as inferred from density fluctuations of the Cosmic Microwave Backg
Externí odkaz:
http://arxiv.org/abs/1806.08395
Autor:
Furlan, E., Ciardi, D. R., Cochran, W. D., Everett, M. E., Latham, D. W., Marcy, G. W., Buchhave, L. A., Endl, M., Isaacson, H., Petigura, E. A., Gautier III, T. N., Huber, D., Bieryla, A., Borucki, W. J., Brugamyer, E., Caldwell, C., Cochran, A., Howard, A. W., Howell, S. B., Johnson, M. C., MacQueen, P. J., Quinn, S. N., Robertson, P., Mathur, S., Batalha, N. M.
We present results from spectroscopic follow-up observations of stars identified in the Kepler field and carried out by teams of the Kepler Follow-Up Observation Program. Two samples of stars were observed over six years (2009-2015): 614 standard sta
Externí odkaz:
http://arxiv.org/abs/1805.12089
Autor:
Smiljanic, R., Franciosini, E., Bragaglia, A., Tautvaisiene, G., Fu, X., Pancino, E., Adibekyan, V., Sousa, S. G., Randich, S., Montalban, J., Pasquini, L., Magrini, L., Drazdauskas, A., Garcia, R. A., Mathur, S., Mosser, B., Regulo, C., Peralta, R. de Assis, Hekker, S., Feuillet, D., Valentini, M., Morel, T., Martell, S., Gilmore, G., Feltzing, S., Vallenari, A., Bensby, T., Korn, A. J., Lanzafame, A. C., Recio-Blanco, A., Bayo, A., Carraro, G., Costado, M. T., Frasca, A., Jofre, P., Lardo, C., de Laverny, P., Lind, K., Masseron, T., Monaco, L., Morbidelli, L., Prisinzano, L., Sbordone, L., Zaggia, S.
Publikováno v:
A&A 617, A4 (2018)
We report 20 new lithium-rich giants discovered within the Gaia-ESO Survey, including the first Li-rich giant with evolutionary stage confirmed by CoRoT data. Atmospheric parameters and abundances were derived in model atmosphere analyses using mediu
Externí odkaz:
http://arxiv.org/abs/1805.07077
Autor:
Van Eylen, V., Dai, F., Mathur, S., Gandolfi, D., Albrecht, S., Fridlund, M., García, R. A., Guenther, E., Hjorth, M., Justesen, A. B., Livingston, J., Lund, M. N., Hernández, F. Pérez, Prieto-Arranz, J., Regulo, C., Bugnet, L., Everett, M. E., Hirano, T., Nespral, D., Nowak, G., Palle, E., Aguirre, V. Silva, Trifonov, T., Winn, J. N., Barragán, O., Beck, P. G., Chaplin, W. J., Cochran, W. D., Csizmadia, S., Deeg, H., Endl, M., Heeren, P., Grziwa, S., Hatzes, A. P., Hidalgo, D., Korth, J., Mathis, S., Rodriguez, P. Montañes, Narita, N., Patzold, M., Persson, C. M., Rodler, F., Smith, A. M. S.
We report the discovery and characterization of HD 89345b (K2-234b; EPIC 248777106b), a Saturn-sized planet orbiting a slightly evolved star. HD 89345 is a bright star ($V = 9.3$ mag) observed by the K2 mission with one-minute time sampling. It exhib
Externí odkaz:
http://arxiv.org/abs/1805.01860
Autor:
Vignali, C., Piconcelli, E., Perna, M., Hennawi, J., Gilli, R., Comastri, A., Zamorani, G., Dotti, M., Mathur, S.
Models and observations suggest that luminous quasar activity is triggered by mergers, so it should preferentially occur in the most massive primordial dark matter haloes, where the frequency of mergers is expected to be the highest. Since the import
Externí odkaz:
http://arxiv.org/abs/1803.08508