Physics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292...45w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 1, p. 45-53
Physics
4
Active Galactic Nuclei, Elliptical Galaxies, Galactic Clusters, Red Shift, Star Formation, Starburst Galaxies, Stellar Physics, Wolf-Rayet Stars, Astronomical Spectroscopy, Balmer Series, Emission Spectra, Imagery, Kinematics, Mass Spectrometers, Spatial Distribution, Stellar Luminosity
Scientific paper
The environment of the luminous low-redshift QSO HE 1029-1401 (z = 0.086, MV = -25.1) is investigated within a projected radius of approximately 700 kpc (H0 = 50 km/s/Mpc, q0 = 0.5) by direct imaging and long-slit spectroscopy. The surface density of galaxies with R less than 22 is uniform to 350 kpc projected radius around the QSO, and shows only minor departures from uniformity at larger radii, revealing to evidence for clustering around the QSO. A spectroscopic survey of 15 galaxies confirms the absence of any rich cluster, but shows four galaxies to have redshifts very similar to that of the QSO. The apparently closest companion however, an elliptical galaxy with 22 sec separation (51 kpc projected distance), is a background object at z = 0.162. The group at z = 0.086 extends over the whole mapped field. Its kinematic properties are similar to those of 'normal' galaxy groups. The two galaxies closest to the QSO in velocity space (+/- 200 km/s) have blue spectra with Balmer absorption and strong emission lines, typical for a major burst of star formation in recent times. One galaxy shows a broad emission feature around lambda 4650, indicating the presence of a large number of Wolf-Rayet stars. A casual relation between these interaction events and the nuclear activity in the QSO itself is not probable, because of the large impact parameter and mass ratio involved. This is supported by the age of no more than a few Myr estimated for the starburst in the Wolf-Rayet galaxy, much less than the commonly assumed evolutionary timescale of active galactic nuclei.
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