منابع مشابه
Planckconfirmation of the disk and halo rotation of M 31
Planck’s data acquired during the first 15.4 months of observations towards both the disk and halo of the M31 galaxy are analyzed. We confirm the existence of a temperature asymmetry, previously detected by using the 7-year WMAP data, along the direction of the M31 rotation, therefore indicative of a Doppler-induced effect. The asymmetry extends up to about 10 degrees (about 130 kpc) from the M...
متن کاملM 31 N 2005 - 09 c : a fast Fe ii nova in the disk of M 31
Context. Classical novae are quite frequent in M 31. However, very few spectra of M31 novae have been studied to date, especially during the early decline phase. Aims. Our aim is to study the photometric and spectral evolution of a M 31 nova event close to outburst. Methods. Here, we present photometric and spectroscopic observations of M31N 2005-09c, a classical nova in the disk of M 31, using...
متن کاملObservations 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 کاملThe inner accretion disk in M 87
The observed AGN in M87 is extremely quiescent compared to expectations based upon simple estimates for the mass accretion rate. We examine the possibility that the nal stages of accretion are advection dominated by comparing current observational constraints on the ux from the M87 core to the predictions of an advection dominated accretion ow (ADAF) model. We nd that the observed self-absorbed...
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...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20021710