THE INTERACTION BETWEEN HOT AND COLD GAS IN EARLY-TYPE GALAXIES

被引:19
作者
BREGMAN, JN [1 ]
HOGG, DE [1 ]
ROBERTS, MS [1 ]
机构
[1] NATL RADIO ASTRON OBSERV, CHARLOTTESVILLE, VA 22903 USA
关键词
GALAXIES; INDIVIDUAL; (NGC; 1291; NGC; 4203); ISM; SPIRAL; X-RAYS;
D O I
10.1086/175382
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
S0 and Sa galaxies have approximately equal masses of H I and X-ray emitting gas and are ideal sites for studying the interaction between hot and cold gas. An X-ray observation of the Sa galaxy NGC 1291 with the ROSAT PSPC shows a striking spatial anticorrelation between hot and cold gas where X-ray emitting material fills the large central hole in the H I disk. This supports a previous suggestion that hot gas is a bulge phenomenon and neutral hydrogen is a disk phenomenon. The X-ray luminosity (1.5 x 10(40) ergs s(-1)) and radial surface brightness distribution (beta = 0.51) is the same as for elliptical galaxies with optical luminosities and velocity dispersions like that of the bulge of NGC 1291. Modeling of the X-ray spectrum requires a component with a temperature of 0.15 keV, similar to that expected from the velocity dispersion of the stars, and with a hotter component where kT = 1.07 keV. This hotter component is not due to emission from stars and its origin remains unclear. PSPC observations are reported for the SO NGC 4203, where a nuclear point source dominates the emission, preventing a study of the radial distribution of the hot gas relative to the H I.
引用
收藏
页码:561 / 567
页数:7
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