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HD 12877


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The vertical velocity dispersion of the stars in the disks of two spiral galaxies
The velocity dispersion in the interarm regions in the disks of twoface-on spiral galaxies has been observed. At approximately oneluminosity scale length from the center, the Z-velocity dispersion ofthe old disk population is (60 + or 20) km/s in NGC 628 and (80 + or -15) km/s in NGC 1566. This indicates that this velocity dispersiondecreases with increasing galactocentric distance in a manner consistentwith that predicted by the constant thickness disks of van der Kruit andSearle. The observations suggest that the old disk populations in spiraldisks have mass-to-light ratios of (5-10) solar mass/solar luminosity,B, similar to those inferred from H I velocity dispersion and layerthickness and for the solar neighborhood. It is noted that the disks arethen not massive enough to account for the amplitude of the rotationcurves, and that more than half of the mass within the optical radiusmust therefore reside outside the disks in a dark halo.

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观测天体数据

星座:波江座
右阿森松:02h04m45.29s
赤纬:-48°51'46.0"
视星:8.815
距离:729.927 天文距离
右阿森松适当运动:9.7
赤纬适当运动:14.6
B-T magnitude:10.016
V-T magnitude:8.915

目录:
适当名称   (Edit)
HD 1989HD 12877
TYCHO-2 2000TYC 8045-903-1
USNO-A2.0USNO-A2 0375-00648840
HIPHIP 9699

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