Zobrazeno 1 - 10
of 30
pro vyhledávání: '"COHEN, ROSS D."'
Autor:
Junkkarinen, V. T., Cohen, Ross D., Beaver, E. A., Burbidge, E. M., Lyons, R. W., Madejski, G.
Publikováno v:
Astrophys.J. 614 (2004) 658-670
We present new HST STIS NUV-MAMA and STIS CCD observations of the BL Lac object AO 0235+164 and the intervening damped Ly alpha (DLA) line at z_a = 0.524. The line profile gives N(H I) = 5 +/- 1 x 10^{21} cm^{-2} and, combined with the H I 21 cm abso
Externí odkaz:
http://arxiv.org/abs/astro-ph/0407281
Autor:
Narayanan, Desika, Hamann, Fred, Barlow, Tom, Burbidge, E. M., Cohen, Ross D., Junkkarinen, Vesa, Lyons, Ron
Publikováno v:
Astrophys.J. 601 (2004) 715-722
Quasar spectra have a variety of absorption lines whose origins range from energetic winds expelled from the central engines to unrelated, intergalactic clouds. We present multi-epoch, medium resolution spectra of eight quasars at z~2 that have narro
Externí odkaz:
http://arxiv.org/abs/astro-ph/0310469
Autor:
Kishimoto, Makoto, Kay, Laura E., Antonucci, Robert, Hurt, Todd W., Cohen, Ross D., Krolik, Julian H.
We present the results of UV imaging polarimetry of the Seyfert 2 galaxy Mrk 477 taken by the Faint Object Camera onboard the Hubble Space Telescope (HST). From a previous HST UV image (lambda ~ 2180A), Mrk 477 has been known to have a pointlike brig
Externí odkaz:
http://arxiv.org/abs/astro-ph/0112520
Autor:
Kishimoto, Makoto, Kay, Laura E., Antonucci, Robert, Hurt, Todd W., Cohen, Ross D., Krolik, Julian H.
We present UV imaging polarimetry data of the Seyfert 2 galaxy Mrk 3 taken by the Hubble Space Telescope. The polarized flux is found to be extended to ~1 kpc from the nucleus, and the position angles of polarization are centrosymmetric, confirming t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0110101
Autor:
Hamann, Fred, Cohen, Ross D., Shields, Joseph, Burbidge, E. M., Junkkarinen, Vesa, Crenshaw, D. M.
NeVIII 774 is an important tracer of the high-ionization gas in QSOs. We examine the NeVIII emission-line properties using new HST-FOS spectra of four sources, mean spectra derived from two QSO samples in the HST archives, and new photoionization cal
Externí odkaz:
http://arxiv.org/abs/astro-ph/9711061
Autor:
Hamann, Fred, Beaver, E. A., Cohen, Ross D., Junkkarinen, Vesa, Lyons, R. W., Burbidge, E. M.
We use new UV and optical spectra and an archival HST-WFPC2 image to study the z_a~z_e absorber in the z_e = 0.20 QSO PKS 2135-147. The UV spectra, obtained with HST-FOS, show strong z_a~z_e absorption lines of C IV, N V, O VI, Ly-alpha and Ly-beta.
Externí odkaz:
http://arxiv.org/abs/astro-ph/9705240
Publikováno v:
Publications of the Astronomical Society of the Pacific, 1980 Jun 01. 92(547), 259-261.
Externí odkaz:
https://www.jstor.org/stable/40677574
Autor:
Lyons, Ron W., Baity, William A., Beaver, Edward A., Cohen, Ross D., Junkkarinen, Vesa T., Linsky, J. B., Bohlin, Ralph C.
Publikováno v:
Proceedings of SPIE; Nov1993, Issue 1, p232-243, 12p
Autor:
Baity, William A., Beaver, Edward A., Cohen, Ross D., Junkkarinen, Vesa T., Lyons, Ron W., Fitch, John E., Hartig, George F., Lindler, Don J.
Publikováno v:
Proceedings of SPIE; Nov1993, Issue 1, p287-300, 14p
Autor:
Bartko, Frank, Burks, Geoffrey S., Kriss, Gerry, Davidsen, Arthur, Cohen, Ross D., Junkkarinen, Vesa T., Lyons, Ron W., Harms, Richard J.
Publikováno v:
Proceedings of SPIE; Nov1993, Issue 1, p318-327, 10p