منابع مشابه
Observations of M 31
As part of the Chandra GTO program we are monitoring and surveying M31 using the HRC and ACIS cameras. These observations have resolved the nuclear X-ray source into five separate sources, one of which is very soft and may (or may not!) be associated with the central super-massive black hole. In addition, the superb spatial resolution and low scattering of the Chandra telescope allows us to una...
متن کاملAn X-ray Source Population Study of the Andromeda Galaxy M 31
Archival XMM-Newton EPIC observations reveal the population of X-ray sources of the bright Local Group spiral galaxy M 31, a low-star-formation-rate galaxy like the Milky Way, down to a 0.2-4.5 keV luminosity of 4.4×10 34 erg s −1. With the help of X-ray hardness ratios and optical and radio information different source classes can be distinguished. The survey detected 856 sources in an area of...
متن کاملThe globular cluster distributions in the Galaxy , M 31 and M 87 : are many globulars disappeared to the galactic centres ? ”
ASTRONOMY AND ASTROPHYSICS 1.2.2008 " The globular cluster distributions in the Galaxy, M31 and M87: are many globulars disappeared to the galactic centres? " Abstract. The radial distribution of globular clusters in our Galaxy, M31 and M87 is studied and compared with that of halo stars. The globular cluster distributions seem significantly flatter than those of the stars bulge. Assuming this ...
متن کاملOn the Mass of M 31
Recent work by several groups has established the properties of the dwarf satellites to M31. We reexamine the reported kinematics of this group employing a fresh technique we have developed previously. By calculating the distribution of a χ statistic (which we define in the paper) for the M31 system, we conclude that the total mass (disk plus halo) of the primary is unlikely to be as great as t...
متن کاملThe outermost cluster of M 31 ⋆
We report on the identification of a new cluster in the far halo of the M31 galaxy. The cluster, named Bologna 514 (B514) has an integrated magnitude M V = −8.5 ± 0.6, and a radial velocity, as estimated from two independent low-resolution spectra, V r = −456 ± 23 km/s, which fully confirms its membership to the M31 system. The observed integrated spectrum is very similar to those of classical ...
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ژورنال
عنوان ژورنال: Science
سال: 1964
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.145.3635.952