Zobrazeno 1 - 10
of 226
pro vyhledávání: '"Tytler, D."'
(Abridged) Aims. To probe the spectral energy distribution (SED) of the ionizing background radiation at z ~ 2 and to specify the sources contributing to the intergalactic radiation field. Methods. The spectrum of a bright quasar HS1103+6416 (zem = 2
Externí odkaz:
http://arxiv.org/abs/1303.1000
Autor:
Dilday, B., Howell, D. A., Cenko, S. B., Silverman, J. M., Nugent, P. E., Sullivan, M., Ben-Ami, S., Bildsten, L., Bolte, M., Endl, M., Filippenko, A. V., Gnat, O., Horesh, A., Hsiao, E., Kasliwal, M. M., Kirkman, D., Maguire, K., Marcy, G. W., Moore, K., Pan, Y., Parrent, J. T., Podsiadlowski, P., Quimby, R. M., Sternberg, A., Suzuki, N., Tytler, D. R., Xu, D., Bloom, J. S., Gal-Yam, A., Hook, I. M., Kulkarni, S. R., Law, N. M., Ofek, E. O., Polishook, D., Poznanski, D.
There is a consensus that Type-Ia supernovae (SNe Ia) arise from the thermonuclear explosion of white dwarf stars that accrete matter from a binary companion. However, direct observation of SN Ia progenitors is lacking, and the precise nature of the
Externí odkaz:
http://arxiv.org/abs/1207.1306
Autor:
Barth, A. J., Pancoast, A., Thorman, S. J., Bennert, V. N., Sand, D. J., Li, W., Canalizo, G., Filippenko, A. V., Gates, E. L., Greene, J. E., Malkan, M. A., Stern, D., Treu, T., Woo, J. -H., Assef, R. J., Bae, H. -J., Brewer, B. J., Buehler, T., Cenko, S. B., Clubb, K. I., Cooper, M. C., Diamond-Stanic, A. M., Hiner, K. D., Hoenig, S. F., Joner, M. D., Kandrashoff, M. T., Laney, C. D., Lazarova, M. S., Nierenberg, A. M., Park, D., Silverman, J. M., Son, D., Sonnenfeld, A., Tollerud, E. J., Walsh, J. L., Walters, R., da Silva, R. L., Fumagalli, M., Gregg, M. D., Harris, C. E., Hsiao, E. Y., Lee, J., Lopez, L., Rex, J., Suzuki, N., Trump, J. R., Tytler, D., Worseck, G., Yesuf, H. M.
The Lick AGN Monitoring Project 2011 observing campaign was carried out over the course of 11 weeks in Spring 2011. Here we present the first results from this program, a measurement of the broad-line reverberation lag in the Seyfert 1 galaxy Mrk 50.
Externí odkaz:
http://arxiv.org/abs/1111.0061
Autor:
Barth, A. J., Nguyen, M. L., Malkan, M. A., Filippenko, A. V., Li, W., Gorjian, V., Joner, M. D., Bennert, V. N., Botyanszki, J., Cenko, S. B., Childress, M., Choi, J., Comerford, J. M., Cucciara, A., da Silva, R., Duchene, G., Fumagalli, M., Ganeshalingam, M., Gates, E. L., Gerke, B. F., Griffith, C. V., Harris, C., Hintz, E. G., Hsiao, E., Kandrashoff, M. T., Keel, W. C., Kirkman, D., Kleiser, I. K. W., Laney, C. D., Lee, J., Lopez, L., Lowe, T. B., Moody, J. W., Morton, A., Nierenberg, A. M., Nugent, P., Pancoast, A., Rex, J., Rich, R. M., Silverman, J. M., Smith, G. H., Sonnenfeld, A., Suzuki, N., Tytler, D., Walsh, J. L., Woo, J. -H., Yang, Y., Zeisse, C.
The Seyfert 1 galaxy Zw 229-015 is among the brightest active galaxies being monitored by the Kepler mission. In order to determine the black hole mass in Zw 229-015 from H-beta reverberation mapping, we have carried out nightly observations with the
Externí odkaz:
http://arxiv.org/abs/1103.2153
Autor:
Chartas, G., Charlton, J., Eracleous, M., Giustini, M., Hidalgo, P. Rodriguez, Ganguly, R., Hamann, F., Misawa, T., Tytler, D.
The current paradigm for the AGN phenomenon is a central engine that consists of an inflow of material accreting in the form of a disk onto a supermassive black hole. Observations in the UV and optical find high velocity ionized material outflowing f
Externí odkaz:
http://arxiv.org/abs/0907.3464
Publikováno v:
Astron.J.134:1634-1654,2007
We list and analyze H I absorption lines at redshifts 2 < z < 4 with column density (12 < log(N_HI) < 19) in 40 high-resolutional (FWHM = 8.0 km/s) quasar spectra obtained with the Keck+HIRES. We de-blend and fit all H I lines within 1,000 km/s of 86
Externí odkaz:
http://arxiv.org/abs/0707.0006
Autor:
Milutinovic, N., Misawa, T., Lynch, R. S., Masiero, J. R., Palma, C., Charlton, J. C., Kirkman, D., Bockenhauer, S., Tytler, D.
We have produced a catalog of line identifications and equivalent width measurements for all absorption features in eight ultraviolet echelle quasar spectra. These spectra were selected as having the highest signal-to-noise among the HST/STIS spectra
Externí odkaz:
http://arxiv.org/abs/0705.1353
Autor:
Misawa, T., Charlton, J. C., Eracleous, M., Ganguly, R., Tytler, D., Kirkman, D., Suzuki, N., Lubin, D.
We use Keck/HIRES spectra of 37 optically bright quasars at z=2-4 to study narrow absorption lines that are intrinsic to the quasars (intrinsic NALs, produced in gas that is physically associated with the quasar central engine). We identify 150 NAL s
Externí odkaz:
http://arxiv.org/abs/astro-ph/0702101
Autor:
Misawa, T., Eracleous, M., Charlton, J. C., Ganguly, R., Tytler, D., Kirkman, D., Suzuki, N., Lubin, D.
We present statistical and monitoring results of narrow absorption lines that are physically related to quasars (i.e., intrinsic NALs). We use Keck/HIRES spectra of 37 optically bright quasars at z=2-4, and identify 150 NAL systems that contain 124 C
Externí odkaz:
http://arxiv.org/abs/astro-ph/0612028
Autor:
Agafonova, I. I., Levshakov, S. A., Reimers, D., Fechner, C., Tytler, D., Simcoe, R. A., Songaila, A.
The shape of the UV ionizing background is reconstructed from optically thin metal absorption-line systems identified in spectra of HE2347-4342, Q1157+3143, and HS1700+6416 in the redshift interval 1.8 < z < 2.9. The systems are analyzed by means of
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610442