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Extended line emission around seven radio-loud quasars at redshift z~2 | | R. J. Wilman
; R. M. Johnstone
; C. S. Crawford
; | | Date: |
2 Aug 2000 | | Journal: | Mon.Not.Roy.Astron.Soc. 317 (2000) 9 | | Subject: | astro-ph | | Abstract: | We present near-infrared spectra of seven radio-loud quasars with a median redshift of 2.1, five of which were previously known to have Ly alpha nebulae. Extended [OIII]5007 and H alpha emission are evident around six objects, at the level of a few times 1E-16 erg/cm^2/arcsec^2/s within 2 arcsec of the nucleus (16 kpc in the adopted cosmology). Nuclear [OII]3727 is detected in three of the 5 quasars studied at this wavelength, and clearly extended in one of them. The extended [OIII] tends to be brighter on the side of the nucleus with the stronger, jet-like radio emission, indicating at least that the extranuclear gas is distributed anisotropically. It is also redshifted by several hundred km/s from the nuclear [OIII], perhaps because the latter is blueshifted from the systemic velocity of the host galaxy. Alternatively, the velocity shifts could be due to infall (which is suggested by line widths ~1000 km/s FWHM) in combination with a suitable dust geometry. Lyalpha/Halpha ratios well below the case B value suggest that some dust is present. Photoionization modelling of the [OIII]/[OII] ratios in the extended gas suggests that its pressure is around or less than a few times 1E7 cm^-3 K; any confining intracluster medium may thus host a strong cooling flow. A comparison with lower-redshift work suggests that there has been little evolution in the nuclear emission line properties of radio-loud quasars between redshifts 1 and 2. | | Source: | arXiv, astro-ph/0008044 | | Services: | Forum | Review | PDF | Favorites | |
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