New Milky Way satellite found in 21-centimeter line observations

Journal Article · Sat Nov 01 04:00:00 EST 1975 · Astrophys. J., Lett., v. 201, no. 3, pp. L103-L108

DOI:https://doi.org/10.1086/181952· OSTI ID:4098864

Simonson, III, S C

An anomalous feature in the 21-cm line observations has the characteristics of an external galaxy passing near the Milky Way. The galaxy's center is at l=197degree./sub /3plus-or-minus0degree./sub /5, b=+2degree./sub / 1plus-or-minus0degree./sub /5, and its angular size is 7degreetimes2degree. Tidal debris extends to l=155degree, b=+8degree, forming a stream of H i high- velocity clouds that crosses l=180degree at V=-90 km s$sup -1$. The observations together with dynamical models of the tidal interaction using Schmidt's rotation parameters indicate a distance from the Sun of 17plus-or-minus4 kpc, a perigalactic distance of 22plus-or-minus2 kpc, and a mass of 1.0plus-or- minus0.2times10$sup 8$ M/sub sun/. (AIP)

• Research Organization: University of Maryland
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-018195
• OSTI ID: 4098864
• Journal Information: Astrophys. J., Lett., v. 201, no. 3, pp. L103-L108, Journal Name: Astrophys. J., Lett., v. 201, no. 3, pp. L103-L108; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

*MILKY WAY-- SATELLITES
640105* --Physics Research--Astrophysics & Cosmology-- Galaxies
COLOR
COORDINATES
MASS
N56500* --Physics (Astrophysics & Cosmology)--Galaxies
RADIAL VELOCITY
ROTATION