Primary black hole spin in OJ287 as determined by the General Relativity centenary flare

Autor: Valtonen, M. J., Zola, S., Ciprini, S., Gopakumar, A., Matsumoto, K., Sadakane, K., Kidger, M., Gazeas, K., Nilsson, K., Berdyugin, A., Piirola, V., Jermak, H., Baliyan, K. S., Alicavus, F., Boyd, D., Torrent, M. Campas, Campos, F., Gomez, J. Carrillo, Caton, D. B., Chavushyan, V., Dalessio, J., Debski, B., Dimitrov, D., Drozdz, M., Er, H., Erdem, A., Perez, A. Escartin, Ramazani, V. Fallah, Filippenko, A. V., Ganesh, S., Garcia, F., Pinilla, F. Gomez, Gopinathan, M., Haislip, J. B., Hudec, R., Hurst, G., Ivarsen, K. M., Jelinek, M., Joshi, A., Kagitani, M., Kaur, N., Keel, W. C., LaCluyze, A. P., Lee, B. C., Lindfors, E., de Haro, J. Lozano, Moore, J. P., Mugrauer, M., Nogues, R. Naves, Neely, A. W., Nelson, R. H., Ogloza, W., Okano, S., Pandey, J. C., Perri, M., Pihajoki, P., Poyner, G., Provencal, J., Pursimo, T., Raj, A., Reichart, D. E., Reinthal, R., Sadegi, S., Sakanoi, T., Gonzalez, J. L. Salto, Schweyer, T., Siwak, M., Alfaro, F. C. Soldan, Sonbas, E., Steele, I., Stocke, J. T., Strobl, J., Takalo, L. O., Tomov, T., Espasa, L. Tremosa, Valdes, J. R., Perez, J. Valero, Verrecchia, F., Webb, J. R., Yoneda, M., Zejmo, M., Zheng, W., Telting, J., Saario, J., Reynolds, T., Kvammen, A., Gafton, E., Karjalainen, R., Harmanen, J., Blay, P.

Publikováno v: ApJ, 819, L37 (2016)

OJ287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts which are predictable in a binary black hole model. The model predicted a major optical outburst in December 2015. We found that the outburst did oc

Externí odkaz: http://arxiv.org/abs/1603.04171

HI 21cm emission from the sub-damped Lyman-alpha absorber at z=0.0063 towards PG1216+069

Autor: Chengalur, Jayaram N., Ghosh, T., Salter, C. J., Kanekar, N., Momjian, E., Keeney, B. A., Stocke, J. T.

We present HI 21cm emission observations of the z ~ 0.00632 sub-damped Lyman-alpha absorber (sub-DLA) towards PG1216+069 made using the Arecibo Telescope and the Very Large Array (VLA). The Arecibo 21cm spectrum corresponds to an HI mass of ~ 3.2x10^

Externí odkaz: http://arxiv.org/abs/1508.02825

The Properties of Low Redshift Intergalactic O VI Absorbers Determined from High S/N Observations of 14 QSOs with the Cosmic Origins Spectrograph

Autor: Savage, B. D., Kim, T. -S., Wakker, B. P., Keeney, B., Shull, J. M., Stocke, J. T., Green, J. C.

We report on the observed properties of the plasma revealed through high signal-to-noise (S/N) observations of 54 intervening O VI absorption systems containing 85 O VI and 133 H I components in a blind survey of 14 QSOs observed at ~18 km s-1 resolu

Externí odkaz: http://arxiv.org/abs/1403.7542

The Firm Redshift Lower Limit of the Most Distant TeV-Detected Blazar PKS 1424+240

Autor: Furniss, A., Williams, D. A., Danforth, C., Fumagalli, M., Prochaska, J. X., Primack, J., Urry, C. M., Stocke, J., Filippenko, A. V., Neely, W.

We present the redshift lower limit of z>0.6035 for the very-high-energy (VHE; E>100 GeV) emitting blazar PKS 1424+240 (PG 1424+240). This limit is inferred from Lyman beta and gamma absorption observed in the far-ultraviolet spectra from the Hubble

Externí odkaz: http://arxiv.org/abs/1304.4859

The Properties of Two Low Redshift O VI Absorbers and Their Associated Galaxies Toward 3C 263

Autor: Savage, B., Kim, T. -S., Keeney, B., Narayanan, A., Stocke, J., Wakker, B.

Ultraviolet observations of the QSO 3C 263 (zem = 0.652) with COS and FUSE reveal O VI absorption systems at z = 0.06342 and 0.14072 . WIYN multi-object spectrograph observations provide information about the galaxies associated with the absorbers. T

Externí odkaz: http://arxiv.org/abs/1205.0762