منابع مشابه
The Proper Motion of the Arches Cluster with Keck Laser-guide Star Adaptive Optics
We present the first measurement of the proper motion of the young, compact Arches cluster near the Galactic center from near-infrared adaptive optics (AO) data taken with the recently commissioned laser-guide star (LGS) at the Keck 10 m telescope. The excellent astrometric accuracy achieved with LGS-AO provides the basis for a detailed comparison with VLT/NAOS-CONICA data taken 4.3 yr earlier....
متن کاملProper motion in Cygnus A
Our recent VLBI observations of the prominent FR II radio galaxy Cygnus A with the EVN and the VLBA reveal a pronounced two-sided jet structure. from which we could derive the kinematics of the jet and counter-jet. On the jet side and on mas scales, the jet seems to accelerate from βapp ≈ 0.1 − 0.2 (Krichbaum et al. 1998) at core-separations near 1 mas to βapp ≈ 0.4 − 0.6 at r ≥ 4 mas (H0 = 100...
متن کاملThe proper motion and energy distribution of the isolated neutron star RX J0720.4-3125
ESO 4m class telescope and VLT deep imaging of the isolated neutron star RXJ0720.4-3125 reveals a proper motion of μ = 97 ± 12mas/yr and a blue U-B color index. We show that a neutron star atmosphere model modified to account for a limited amount of hydrogen on the star’s surface can well represent both the optical and X-ray data without invoking any additional components. The large proper moti...
متن کاملStar-factors with large components
In this note, we prove a theorem on component factors. For a set of connected graphs H, a spanning subgraph H of a graph G is said to be an H-factor if every component of H is isomorphic to some member of H. Amahashi and Kano [Discrete Math. 42 (1982), 1–6] have proved that a graph G which satisfies i(G−S) ≤ m|S| for every S ⊂ V (G) has a {K1,l : 1 ≤ l ≤ m}-factor, where i(G) is the number of i...
متن کامل0 The Proper Motion , Parallax , and Origin of the Isolated Neutron Star RX J 185635 - 3754
The isolated neutron star RX J185635-3754 is the closest known neutron star to the Sun. Based on HST WFPC2 obervations over a 3 year baseline, I report its proper motion (332±1 mas yr at a position angle of 100.3±0.1) and parallax (16.5±2.3 mas; 61 pc). This proper motion brings the neutron star from the general vicinity of the Sco-Cen OB association. For an assumed neutron star radial velocity...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1885
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.18851111612