Hubble Space Telescope Imaging of the Post-starburst Quasar UN J1025-0040: ``Post''-starburst No More?

Details Hubble Space Telescope Imaging of the Post-starburst Quasar UN J1025-0040: ``Post''-starburst No More? Hubble Space Telescope Imaging of the Post-starburst Quasar UN J1025-0040: ``Post''-starburst No More?

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.4303g&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #43.03; Bulletin of the American Astronomical Society, Vol. 33, p.1365

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new HST WFPC2 images of the post-starburst quasar UN J1025-0040, which contains both an AGN and a 400-Myr-old nuclear starburst of similar bolometric luminosity ( ~1011.6 solar luminosities). The F450W and F814W images fail to clearly separate the starburst and quasar components, but do show that the bulk of the stars (7 x 1010 solar masses) are contained within a central radius of about 600 parsecs. Equating the point-source light in each image with the AGN contribution, we determined the ratio of AGN-to-starburst light. This ratio is 68% in the red F814W image, consistent with our previous spectral analysis, but < 50% in the blue F450W image whereas we had predicted 76%. The HST images are consistent with previous photometry ruling out variability (a fading AGN) as a cause for this result. We can explain the new data if there is a previously unknown young stellar population present, 40 Myr or younger, with as much as 10% of the mass of the dominant 400-Myr-old population. This younger starburst may represent the trigger for the current nuclear activity. The multiple starburst ages seen in UN J1025-0040 and its companion galaxy indicate a complex interaction and star formation history. Matthew Grabelsky acknowledges support from the NOAO/KPNO Research Experiences for Undergraduates program funded by the National Science Foundation. Support for proposal GO-08703 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

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