Zobrazeno 1 - 10
of 1 697
pro vyhledávání: '"Weymann, R. J."'
Autor:
Williger, G. M., Carswell, R. F., Weymann, R. J., Jenkins, E. B., Sembach, K. R., Tripp, T. M., Davé, R., Haberzettl, L., Heap, S. R.
Publikováno v:
MNRAS, v405, 1736 (2010)
We present an analysis of the Ly-a forest toward 3C 273 from the Space Telescope Imaging Spectrograph at ~7 km/s resolution, along with re-processed data from the Far Ultraviolet Spectroscopic Explorer. The high UV flux of 3C 273 allows us to probe t
Externí odkaz:
http://arxiv.org/abs/1002.3401
Autor:
Williger, G. M., Heap, S. R., Weymann, R. J., Dave, R., Ellingson, E., Carswell, R. F., Tripp, T. M., Jenkins, E. B.
Publikováno v:
Astrophys.J.636:631-653,2006
We present STIS 7km/s resolution data of the Ly-a forest toward PKS0405-123 (z=0.574). We make two samples. The strong sample (60 systems) has column density logNHI>13.3 over 0.00213.1 at 0.020
Externí odkaz:
http://arxiv.org/abs/astro-ph/0505586
Publikováno v:
Astrophys.J. 609 (2004) 94
We report the discovery of a dwarf (M_B = -13.9) post-starburst galaxy coincident in recession velocity (within uncertainties) with the highest column density absorber (N_HI = 10^15.85 cm^{-2} at cz = 1586 km/s) in the 3C~273 sightline. This galaxy i
Externí odkaz:
http://arxiv.org/abs/astro-ph/0403042
Publikováno v:
Astrophys.J. 574 (2002) L115-L118
We have conducted pointed redshift surveys for galaxies in the direction of bright AGN whose HST far-UV spectra contain nearby (cz <~ 30,000 kms), low column density (12.5 <= log N_{HI} (cm s^{-2}) <= 14.5) Ly-alpha forest absorption systems. Here we
Externí odkaz:
http://arxiv.org/abs/astro-ph/0206384
Autor:
Tripp, T. M., Jenkins, E. B., Williger, G. M., Heap, S. R., Bowers, C. W., Danks, A. C., Dave', R., Green, R. F., Gull, T. R., Joseph, C. L., Kaiser, M. E., Lindler, D., Weymann, R. J., Woodgate, B. E.
Publikováno v:
Astrophys.J.575:697-711,2002
Using high S/N STIS echelle spectra (FWHM=7 km/s) of 3C 273, we constrain the metallicities of two Lya clouds in the vicinity of the Virgo cluster. We detect C II, Si II, and Si III absorption lines in the Lya absorber at z = 0.00530. Previous observ
Externí odkaz:
http://arxiv.org/abs/astro-ph/0204204
We present a preliminary study of the metallicity of low-redshift Lyman alpha absorbers from the HST/STIS spectrum of 3C273. Using a pixel-based shift-and-coadd technique, we compare observations to carefully-constructed mock quasar spectra from a co
Externí odkaz:
http://arxiv.org/abs/astro-ph/0109242
We present preliminary results on the low-redshift Lyman alpha forest as based on STIS spectra of 3C 273. A total of 121 intergalactic Lyman alpha-absorbing systems were detected, of which 60 are above the 3.5 sigma completness limit, log N(HI)~12.3.
Externí odkaz:
http://arxiv.org/abs/astro-ph/0109100
Publikováno v:
Astrophysical Journal (Vol. 561, No. 2, November 10, 2001 issue)
We report a new Fabry-Perot search for Halpha emission from the intergalactic cloud HI 1225+01 in an attempt to measure the low redshift ionizing background radiation. We set a new 2 sigma upper limit on Halpha emission of 8 mR (5 x 10^{-20} ergs cm^
Externí odkaz:
http://arxiv.org/abs/astro-ph/0107534
Publikováno v:
ASP Conf.Ser.255:137-142,2002
We discuss new high-resolution (6.7 km/s) spectra of the associated absorption lines (AALs) in the radio-loud quasar 3C 191. The measured AALs have ionizations ranging from Mg I to N V, and multi-component profiles that are blueshifted by ~400 to ~14
Externí odkaz:
http://arxiv.org/abs/astro-ph/0105337
Autor:
Brandt, J. C., Heap, S. R., Walter, F. M., Beaver, E. A., Boggess, A., Carpenter, K. G., Ebbets, D. C., Hutchings, J. B., Jura, M., Leckrone, D. S., Linsky, J. L., Maran, S. P., Savage, B. D., Smith, A. M., Trafton, L. M., Weymann, R. J., Norman, D., Redfield, S.
We analyze HST/GHRS spectra of AB Doradus, the prototypical ultra-rapidly rotating K dwarf. We observed chromospheric (Mg II) and transition region (C II, Si IV, C IV, and N V) lines periodically throughout the stellar rotation period, and provide a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0012487