5 papers
47 Tuc: The Spectroscopic Versus CMD Age Discrepancy
Alexandre Vazdekis, Maurizio Salaris, Nobuo Arimoto +1
We investigate current problems in obtaining reliable ages for old stellar systems based on stellar population synthesis modelling of their integrated spectra. In particular, we ad…
Self-enrichment in Omega Centauri
C. Ikuta, N. Arimoto
The origin of abundance spreads observed in omega Centauri is studied in the context of the self-enrichment scenario. Five chemical evolution models are constructed and are compare…
Why Can We Detect Quasar BR12020725 in Co ?
Chisato Ikuta, Nobuo Arimoto, Yoshiaki Sofue +1
We present CO luminosity evolution of both elliptical and spiral galaxies based on a galactic wind model and a bulge-disk model, respectively. We have found that the CO luminosity…
The Epoch of Major Star Formation in High-z Quasar Hosts
Yoshiaki Taniguchi, Nobuo Arimoto, Takashi Murayama +3
We present the results of our observing program on near infrared spectroscopy of high-redshift quasars which have been undertaken both at Kitt Peak National Observatory and at Maun…
The Molecular Front in Galaxies II : Galactic-scale Gas Phase Transition of HI and H2
Mareki Honma, Yoshiaki Sofue, Nobuo Arimoto
We have examined the distribution of HI and H gases in four face-on galaxies by using the observed dat a of CO and HI line emissions from the literatures. We demonstrate that t…