Curran, S. J., Tzanavaris, P., Pihlstroem, Y. M., Webb, J. K.
We present the results of a survey for 21-cm absorption in four never previously searched damped Lyman-alpha absorption systems (DLAs) with the Westerbork Synthesis Radio Telescope. We add our...
Detection of broad 21-cm absorption at z = 0.656 in the complex sight-line towards 3C336 (2007)
Curran, S. J., Tzanavaris, P., Murphy, M. T., Webb, J. K., Pihlstroem, Y. M.
We report the detection of 21-cm absorption at z = 0.656 towards 1622+238 (3C336). The line is very broad with a Full-Width Half Maximum (FWHM) of 235 km/s, giving a velocity integrated optical depth...
A survey for redshifted molecular and atomic absorption lines I (2006)
Curran, S. J., Whiting, M. T., Murphy, M. T., Webb, J. K., Longmore, S. N., Pihlstroem, Y. M., ...
We are currently undertaking a large survey for redshifted atomic and molecular absorption ... only one clear and one tentative detection were obtained: HI absorption at z = 0.097 in PKS 1555-140 and...
Spin temperatures and covering factors for HI 21-cm absorption in damped Lyman-alpha systems (2004)
Curran, S. J., Murphy, M. T., Pihlstroem, Y. M., Webb, J. K., Purcell, C. R.
We investigate the practice of assigning high spin temperatures to damped Lyman-alpha absorption systems (DLAs) not detected in HI 21-cm absorption. In particular, Kanekar & Chengaulr (2003) have...
Molecular fraction limits in damped Lyman-alpha absorption systems (2004)
Curran, S. J., Murphy, M. T., Pihlstroem, Y. M., Webb, J. K., Bolatto, A. D., Bower, G. C.
We have used the Green Bank Telescope (GBT) and Berkeley-Illinois-Maryland Association (BIMA) array to search for redshifted millimetre absorption in a sample of damped Lyman-alpha absorption systems...
The Presence and Distribution of HI Absorbing Gas in Sub-galactic Sized Radio Sources (2003)
Pihlstroem, Y. M., Conway, J. E., Vermeulen, R. C.
We consider the incidence of HI absorption in intrinsically small sub-galactic sized extragalactic sources selected from sources classified as Gigahertz Peaked Spectrum (GPS) and Compact Steep...
Observations of HI Absorbing Gas in Compact Radio Sources at Cosmological Redshifts (2003)
Vermeulen, R. C., Pihlstroem, Y. M., Tschager, W., De Vries, W. H., Conway, J. E., Barthel, P. D., ...
We present an overview of the occurrence and properties of atomic gas associated with compact radio sources at redshifts up to z=0.85. Searches for HI 21cm absorption were made with the Westerbork...
HI Absorption in GPS/CSS Sources (2002)
Pihlstroem, Y. M., Conway, J. E., Vermeulen, R. C.
Combining our own observations with data from the literature, we consider the incidence of HI absorption in Gigahertz Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) sources. Here we present...
A 22GHz search for molecular absorption at z~3 with the upgraded ATCA (2002)
Curran, S. J., Murphy, M. T., Webb, J. K., Pihlstroem, Y. M.
We report a lambda > 1cm search for rotational molecular absorption towards quasars, now possible with the upgraded Australia Telescope Compact Array (ATCA). The targets were PKS 0201+113, PKS...
A Thin HI Circumnuclear Disk in NGC4261 (1999)
Van Langevelde, H. J., Pihlstroem, Y. M., Conway, J. E., Jaffe, W., Schilizzi, R. T.
We report on high sensitivity, spectral line VLBI observations of the HI absorption feature in the radio galaxy NGC4261. Although absorption is only detectable on the most sensitive baseline, it can...