New observations of the gas cloud associated with the quasar-galaxy pair 3C 232/NGC 3067
New observations of the gas cloud associated with the quasar-galaxy pair 3C 232/NGC 3067
复制标题
对与类星体星系对 3C 232/NGC 3067 相关的气体云的新观测
DOI:
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发表时间:
1991
期刊:
影响因子:
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通讯作者:
T. Snow
中科院分区:
文献类型:
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作者:
J. Stocke;J. Case;M. Donahue;J. Shull;T. Snow
New optical Na I and Ca II spectra, new Hα images, and archival IUE ultraviolet spectra of the quasar-galaxy pair 3C 232/NGC 3067 are presented to study the H I gas cloud seen in 21 cm emission between the eastern edge of NGC 3067 and 3C 232. High-resolution optical spectra show two, and possibly three, absorption systems in Ca II and Na I, with a large velocity spread ; IUE spectra show Fe II and Mg II absorption. The strongest system is coincident with narrow 21 cm absorption at cz = 1420 km/s and has Na I/Ca II 0.7-2, suggesting that the Ca-bearing grains have not been strongly disturbed. The H I absorption is most likely produced by cold gas comprising 1%-2% of the 3 × 10 21 cm -2 of warm H I seen in 21 cm emission