TY - JOUR
T1 - PG 1700+518 revisited
T2 - Adaptive-optics imaging and a revised starburst age for the companion
AU - Stockton, Alan
AU - Canalizo, Gabriela
AU - Close, Laird M.
N1 - Funding Information:
2 Visiting Astronomer, Canada-France-Hawaii Telescope, operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique de France, and the University of Hawaii.
Funding Information:
The AO imaging observations would not have been possible without the support of Franc¸ois Roddier, Malcolm Northcott, and J. Elon Graves. The AO system used in these observations was built with the support of NSF grant AST93-19004. We thank Jeff Goldader for helpful comments on the spectral synthesis models. This research was partially supported by NSF under grant AST95-29078.
PY - 1998
Y1 - 1998
N2 - We present the results of adaptive-optics imaging of the z = 0.2923 QSO PG 1700+518 in the J and H bands. The extension to the north of the QSO is clearly seen to be a discrete companion with a well-defined tidal tail, rather than a feature associated with the host galaxy of PG 1700+518 itself. On the other hand, an extension to the southwest of the QSO (seen best in deeper, but lower resolution, optical images) does likely comprise tidal material from the host galaxy. The spectral energy distribution (SED) derived from images in J, H, and two nonstandard optical bands indicates the presence of dust intermixed with the stellar component. We use our previously reported Keck spectrum of the companion, the SED found from the imaging data, and updated spectral synthesis models to constrain the stellar populations in the companion and to redetermine the age of the starburst. While our best-fit age of 0.085 Gyr is nearly the same as our earlier determination, the fit of the new models is considerably better. This age is found to be remarkably robust with respect to different assumptions about the nature of the older stellar component and the effects of dust.
AB - We present the results of adaptive-optics imaging of the z = 0.2923 QSO PG 1700+518 in the J and H bands. The extension to the north of the QSO is clearly seen to be a discrete companion with a well-defined tidal tail, rather than a feature associated with the host galaxy of PG 1700+518 itself. On the other hand, an extension to the southwest of the QSO (seen best in deeper, but lower resolution, optical images) does likely comprise tidal material from the host galaxy. The spectral energy distribution (SED) derived from images in J, H, and two nonstandard optical bands indicates the presence of dust intermixed with the stellar component. We use our previously reported Keck spectrum of the companion, the SED found from the imaging data, and updated spectral synthesis models to constrain the stellar populations in the companion and to redetermine the age of the starburst. While our best-fit age of 0.085 Gyr is nearly the same as our earlier determination, the fit of the new models is considerably better. This age is found to be remarkably robust with respect to different assumptions about the nature of the older stellar component and the effects of dust.
KW - Galaxies: interactions
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U2 - 10.1086/311409
DO - 10.1086/311409
M3 - Article
AN - SCOPUS:22044432478
SN - 0004-637X
VL - 500
SP - L121-L127
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 PART II
ER -