Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1534h&link_type=abstract
The Astronomical Journal (ISSN 0004-6256), vol. 108, no. 5, p. 1534-1541
Astronomy and Astrophysics
Astronomy
29
Gravitational Lenses, Image Analysis, Quasars, Stellar Spectra, Stellar Spectrophotometry, Ultraviolet Astronomy, Ultraviolet Spectra, Visible Spectrum, Absorption Spectra, Charge Coupled Devices, Emission Spectra, Line Spectra
Scientific paper
We report photometry and spectra of three quasars, two of which make up a candidate close-separation gravitational lens, Q1009-0252A, B. The system is unusual in that a bright foreground quasar is projected only approximately 4.5 arcsec from the line of sight to Q1009-0252. The gravitational lens candidate consists of two images, magnitudes mV = 17.9 and 20.5, separation 1.53 arcsec. Spectra show both images to be quasars with redshift z = 2.739 and very similar emission line and continuum properties, although the fainter component is somewhat redder and its emission lines have larger equivalent widths. Charge coupled device (CCD) photometry in B, V, R and I confirms the fainter component has a redder V-I color. Both components show strong Mg II absorption at z = 0.869 and lensing by a massive galaxy at the absorption redshift can reproduce the main properties of the system. A second quasar, mV = 19.1, redshift z = 1.627, lies only 4.62 arcsec from Q1009-0252A. The geometric and photometric properties we derive for the Q1009-0252 system are in good agreement with the results of Surdej et al., who discovered the system independently in the course of their European Southern Observatory (ESO) Key Project. Detection of weak absorption from the z = 0.869 Mg II system in the z = 1.627 quasar sets a lower limit to the scale of the Mg II absorber of 40/h50 kpc. Strong Mg II absorption is visible in both components of the lens candidate at the emission redshift of the nearby z = 1.627 quasar, placing a lower limit of 45/h50 kpc to the size of the Mg II system associated with the quasar.
Corrigan R. T.
Dinshaw Nadine
Foltz Craig B.
Harding Margaret E.
Hewett Paul C.
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