Pulsars, transients and relativistic astrophysics

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On the Progenitor of the Type Ic Supernova 2002ap

The Astrophysical Journal American Astronomical Society 572:2 (2002) l147-l151

Authors:

SJ Smartt, PM Vreeswijk, E Ramirez-Ruiz, GF Gilmore, WPS Meikle, AMN Ferguson, JH Knapen
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The Type Ic Hypernova SN 2002ap

The Astrophysical Journal American Astronomical Society 572:1 (2002) l61-l65

Authors:

PA Mazzali, J Deng, K Maeda, K Nomoto, H Umeda, K Hatano, K Iwamoto, Y Yoshii, Y Kobayashi, T Minezaki, M Doi, K Enya, H Tomita, SJ Smartt, K Kinugasa, H Kawakita, K Ayani, T Kawabata, H Yamaoka, YL Qiu, K Motohara, CL Gerardy, R Fesen, KS Kawabata, M Iye, N Kashikawa, G Kosugi, Y Ohyama, M Takada-Hidai, G Zhao, R Chornock, AV Filippenko, S Benetti, M Turatto
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Non-radial pulsation, rotation and outburst in the Be star ω Orionis from the MuSiCoS 1998 campaign*

Astronomy & Astrophysics EDP Sciences 388:3 (2002) 899-916

Authors:

C Neiner, A-M Hubert, M Floquet, S Jankov, HF Henrichs, B Foing, J Oliveira, S Orlando, J Abbott, IK Baldry, TR Bedding, J Cami, H Cao, C Catala, KP Cheng, A Domiciano de Souza, E Janot-Pacheco, JX Hao, L Kaper, A Kaufer, NV Leister, JE Neff, SJ O'Toole, D Schäfer, SJ Smartt, O Stahl, J Telting, S Tubbesing, J Zorec
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Simultaneous single-pulse observations of radio pulsars: II. Orthogonal polarization modes in PSR B1133+16

ArXiv astro-ph/0205550 (2002)

Authors:

A Karastergiou, M Kramer, S Johnston, AG Lyne, NDR Bhat, Y Gupta

Abstract:

In this paper, we present a study of orthogonal polarization modes in the radio emission of PSR B1133+16, conducted within the frame of simultaneous, multi-frequency, single-pulse observations. Simultaneously observing at two frequencies (1.41 GHz and 4.85 GHz) provides the means to study the bandwidth of polarization features such as the polarization position angle. We find two main results. First, that there is a high degree of correlation between the polarization modes at the two frequencies. Secondly, the modes occur more equally and the fractional linear polarization decreases towards higher frequencies. We discuss this frequency evolution and propose propagation effects in the pulsar magnetosphere as its origin.
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Optical spectroscopy of radio galaxies in the 7C Redshift Survey

ArXiv astro-ph/0205507 (2002)

Authors:

Chris J Willott, Steve Rawlings, Katherine M Blundell, Mark Lacy, Gary J Hill, Susan E Scott

Abstract:

We present optical spectroscopy of all 49 radio galaxies in the 7C-I and 7C-II regions of the 7C Redshift Survey (7CRS). The low-frequency (151 MHz) selected 7CRS sample contains all sources with flux-densities S_151 > 0.5 Jy in three regions of the sky; 7C-I and 7C-II were chosen to overlap with the 5C6 and 5C7 surveys respectively, and cover a total sky area of 0.013 sr. The sample has been completely identified and spectroscopy of the quasars and broad-lined radio galaxies has been presented in Willott et al. (1998). Only seven of the radio galaxies do not have redshift determinations from the spectroscopy, giving a redshift completeness for the sample of >90%. The median redshift of the 7CRS is 1.1. We present a composite 0.2
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