Zobrazeno 1 - 10
of 172
pro vyhledávání: '"Fechner C"'
Autor:
Richter, P., Winkel, B., Wakker, B. P., Pingel, N. M., Fox, A. J., Heald, G., Walterbos, R. A. M., Fechner, C., Bekhti, N. Ben, Gentile, G., Zschaechner, L.
We present a detailed analysis of the absorption properties of one of the tidal gas streams around the Whale galaxy NGC4631 in the direction of the quasar 2MASSJ12421031+3214268. Our study is based on ultraviolet spectral data obtained with the Cosmi
Externí odkaz:
http://arxiv.org/abs/1810.07700
Autor:
Richter, P., Nuza, S. E., Fox, A. J., Wakker, B. P., Lehner, N., Bekhti, N. Ben, Fechner, C., Wendt, M., Howk, J. C., Muzahid, S., Ganguly, R., Charlton, J. C.
Publikováno v:
A&A 607, A48 (2017)
To characterize the absorption properties of this circumgalactic medium (CGM) and its relation to the LG we present the so-far largest survey of metal absorption in Galactic high-velocity clouds (HVCs) using archival ultraviolet (UV) spectra of extra
Externí odkaz:
http://arxiv.org/abs/1611.07024
Publikováno v:
A&A 590, A68 (2016)
Doubly ionized silicon (SiIII) is a powerful tracer of diffuse ionized gas inside and outside of galaxies. It can be observed in the local Universe in ultraviolet (UV) absorption against bright extragalactic background sources. We here present an ext
Externí odkaz:
http://arxiv.org/abs/1507.06317
To explore the ionization conditions in highly-ionized absorbers at high redshift we have studied in detail two intervening OVI absorbers at z=2 towards the quasar PKS1448-232, based on high (R=75,000) and intermediate (R=45,000) resolution optical V
Externí odkaz:
http://arxiv.org/abs/1110.4515
(Abridged) We present a systematic study of weak intervening CaII absorbers at low redshift (z<0.5), based on the analysis of archival high resolution (R>45,000) optical spectra of 304 quasars and active galactic nuclei observed with VLT/UVES. Along
Externí odkaz:
http://arxiv.org/abs/1008.2201
Autor:
Schoerck, T., Christlieb, N., Cohen, J. G., Beers, T. C., Shectman, S., Thompson, I., McWilliam, A., Bessell, M. S., Norris, J. E., Melendez, J., Ramirez, S. Solange, Haynes, D., Cass, P., Hartley, M., Russell, K., Watson, F., Zickgraf, F. -J., Behnke, B., Fechner, C., Fuhrmeister, B., Barklem, P. S., Edvardsson, B., Frebel, A., Wisotzki, L., Reimers, D.
We determine the metallicity distribution function (MDF) of the Galactic halo by means of a sample of 1638 metal-poor stars selected from the Hamburg/ESO objective-prism survey (HES). The sample was corrected for minor biases introduced by the strate
Externí odkaz:
http://arxiv.org/abs/0809.1172
Autor:
Fechner, C., Richter, P.
We present a study of NV absorption systems at 1.5 < z < 2.5 in the optical spectra of 19 QSOs. Our analysis includes both absorbers arising from the intergalactic medium as well as systems in the vicinity of the background quasar. We construct detai
Externí odkaz:
http://arxiv.org/abs/0807.4638
Publikováno v:
A&A 470, 67-72 (2007)
We present an analysis of the Lyman alpha forests of five quasar spectra in the near UV. Properties of the intergalactic medium (IGM) at an intermediate redshift interval (0.9 < z < 1.9) are studied. The amount of baryons in the diffuse photoionised
Externí odkaz:
http://arxiv.org/abs/0705.1633
Publikováno v:
Astron.Astrophys. 473 (2007) 805
We report the discovery of 14 quasars in the vicinity of HE2347-4342, one of the two quasars whose intergalactic HeII forest has been resolved with FUSE. By analysing the HI and the HeII opacity variations separately, no transverse proximity effect i
Externí odkaz:
http://arxiv.org/abs/0704.0187
Autor:
Fechner, C., Reimers, D.
Recent analyses of the intergalactic UV background by means of the HeII Lyman alpha forest assume that HeII and HI absorption features have the same line widths. We omit this assumption to investigate possible effects of thermal line broadening on th
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611620