תוכן
תמונות
הוסף תמונה שלך
DSS Images Other Images
מאמרים קשורים
The distance to the high-velocity clouds - Mass infall and galactic disk formation
The high-velocity neutral hydrogen complex C in optical (Ca K)absorption against stars at distances of 1-2 kpc has been detected,confirming a previous tentative detection and placing an upper limit onthe distance to this complex. A similar (though as yet more uncertain)limit is placed to the distance to complex A. No complex is detected inabsorption against any nearby star, effectively ruling out models inwhich the clouds are formed by supershells in the local disk. If thesedistances are representative of the bulk of the high-velocity clouds,the local mass infall rate is 6 x 10 to the -9th solar mass/sq pc/yr,which would supply the disk column density in 10 billion yr. The cloudslie above the bulk of the disk, and it is shown how they may be used tomeasure the pressure of the halo and to place an upper bound on themetagalactic UV flux.
|
הכנס מאמר חדש
לינקים קשורים
הכנס לינק חדש
משמש של הקבוצה הבאה
|
תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | דרקון |
| התרוממות ימנית: | 16h35m19.22s |
| סירוב: | +55°30'33.9" |
| גודל גלוי: | 8.419 |
| מרחק: | 259.067 פארסק |
| תנועה נכונה: | -5.2 |
| תנועה נכונה: | 6 |
| B-T magnitude: | 8.716 |
| V-T magnitude: | 8.444 |
קטלוגים וכינוים:
|
INHABITED SKY
