Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.2601k&link_type=abstract
American Astronomical Society, AAS Meeting #212, #26.01; Bulletin of the American Astronomical Society, Vol. 40, p.224
Astronomy and Astrophysics
Astronomy
Scientific paper
We have analyzed new broadband HST/WFPC2 images, ground-based Hα images and optical spectra, and VLA H I 21 cm emission maps of the nearby galaxy ESO 1327-2041 (czgal = 5340 km/s), which is located 38” west of the QSO PKS 1327-206 (zem = 1.17). The QSO spectrum shows absorption features near the redshift of ESO 1327-2041 at czabs = 5250 and 5500 km/s that have been detected in H I 21 cm, Na I D, and Ca II H & K. ESO 1327-2041 has a complex optical and H I morphology, with an inclined disk oriented roughly north-south, a long "tail" of material that extends to the north of galaxy center, and a faint polar ring with a major axis that is oriented roughly east-west. Our WFPC2 images also reveal a second disk of material that is evident in the central regions of the galaxy at approximately the same orientation as the polar ring, suggesting that the complex morphology of ESO 1327-2041 is the result of a recent merger. Our ground-based Hα images confirm the presence of several H II regions in this second disk, which likely represent star formation triggered by the merger. The complexity of the QSO/galaxy relationship in this nearby damped Lyα absorber (DLA) suggests that our view of DLAs and sub-DLAs at high redshift is quite likely oversimplified. In addition to the data already in-hand, we have requested HST/WFC3 Hα images of this system to confirm whether potential H II regions seen in the polar ring are the most likely sources of absorbing gas in the spectrum of PKS 1327-206.
Carilli Chris
Danforth Charles
Keeney Brian A.
Stocke John T.
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