Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.5203m&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #52.03; Bulletin of the American Astronomical Society, Vol. 31, p.1451
Astronomy and Astrophysics
Astronomy
Scientific paper
In order to better understand the range of physical conditions present in the interstellar and halo gas associated with intermediate redshift galaxies, we examined a sample of 45 MgII absorption--selected systems over the redshift range 0.4 to 1.4. MgII and FeII absorption profiles were observed at a resolution of 6 km/s with HIRES/Keck. Lya and CIV were measured in FOS spectra obtained from the Hubble Space Telescope archive (resolution 230 km/s). We performed a multivariate analysis using rest--frame equivalent widths (W) of MgII, FeII, CIV, and Lya and the MgII kinematic spread. Based upon these properties, we find that intermediate redshift absorbers can be organized into five categories: ``Classic'', ``CIV--deficient'', ``Single/Weak'', ``Double'', and ``DLA/HI--Rich''. These categories arise, in part, because there is a strong connection between low--ionization kinematics and the location of an absorber on the W(CIV)--W(MgII) plane. We compare the locations of our intermediate redshift absorbers on the W(CIV)--W(MgII) plane with those of lower and higher redshift data taken from the literature and find evidence for evolution that is connected with the MgII kinematics seen in HIRES/Keck profiles at z > 1.4. We discuss the potential of using the above categories of absorbers to understand galactic evolution from the perspective of the underlying physical processes giving rise to and governing galactic gas and its ionization phases and kinematics.
Charlton Jane
Churchill Chris
Jannuzi Buell
Kirhakos Sofia
Mellon Richard R.
No associations
LandOfFree
The Taxonomy of MgII Absorbers: A Multivariate Analysis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Taxonomy of MgII Absorbers: A Multivariate Analysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Taxonomy of MgII Absorbers: A Multivariate Analysis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1740806