NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-25 T17:12:40 PDT
Help | Comment | NED Home

For refcode 2010ApJ...711..380B:
Retrieve 77 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2010ApJ...711..380B Mg II Absorption Systems with W_0_ >= 0.1 A for a Radio Selected Sample of 77 Quasi-Stellar Objects and their Associated Magnetic Fields at High Redshift Bernet, M. L.; Miniati, F.; Lilly, S. J. Abstract. We present a catalog of Mg II absorption systems obtained from high-resolution Ultraviolet and Visual Echelle Spectrograph/VLT data of 77 quasi-stellar objects in the redshift range 0.6 < z < 2.0, and down to an equivalent width W_0_ >= 0.1 A. The statistical properties of our sample are found to be in agreement with those from the previous work in the literature. However, we point out that the previously observed increase with redshift of {partial differential}N/{partial differential}z for weak absorbers pertains exclusively to very weak absorbers with W_0_ < 0.1 A. Instead, {partial differential}N/{partial differential}z for absorbers with W_0_ in the range 0.1-0.3 A actually decreases with redshift, similar to the case of strong absorbers. We then use this catalog to extend our earlier analysis of the links between the Faraday rotation measure (RM) of the quasars and the presence of intervening Mg II absorbing systems in their spectra. In contrast to the case with strong Mg II absorption systems (W_0_ > 0.3 A), the weaker systems do not contribute significantly to the observed RM of the background quasars. This is possibly due to the higher impact parameters of the weak systems compared to strong ones, suggesting that the high column density magnetized material that is responsible for the Faraday rotation is located within about 50 kpc of the galaxies. Finally, we show that this result also rules out the possibility that some unexpected secondary correlation between the quasar redshift and its intrinsic RM is responsible for the association of high RM and strong intervening Mg II absorption that we have presented elsewhere, since this would have produced an equal effect for the weak absorption line systems, which exhibit a very similar distribution of quasar redshifts. Key words: galaxies: high-redshift, galaxies: magnetic fields, methods: data analysis, quasars: absorption lines
Retrieve 77 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home