منابع مشابه
Hydrodynamic simulations of the triaxial bulge of M31
The interstellar gas flow in the inner disk of M31 is modelled using a new, two dimensional, grid based, hydrodynamics code. The potential of the stellar bulge is derived from its surface brightness profile. The bulge is assumed to be triaxial and rotating in the same plane as the disk in order to explain the twisted nature of M31’s central isophotes and the non circular gas velocities in the i...
متن کامل3d Spectrophotometry of Planetary Nebulae in the Bulge of M31
We introduce crowded field integral field (3D) spectrophotometry as a useful technique for the study of resolved stellar populations in nearby galaxies. The spectroscopy of individual extragalactic stars, which is now feasible with efficient instruments and large telescopes, is confronted with the observational challenge of accurately subtracting the bright, spatially and wavelength-dependent n...
متن کاملA Soft X-ray Transient in the M31 Bulge
We have examined a probable soft X-ray transient source in the M31 bulge at R.A.=0:42:41.814 ± 0.08, Dec. = 41:16:35.86 ± 0.07. On the three occasions we observed the source, its spectrum was soft (kTin ≈ 1 keV). The brightest detection of the source was 2004 July 17 with a 0.3–7 keV luminosity of ∼5×10 erg s. The only previous detection of the source was in 1979 by the Einstein observatory. Th...
متن کاملThe Metallicity Distribution Function of Field Stars in M31’s Bulge
We have used Hubble Space Telescope Wide Field Planetary Camera 2 observations to construct a color-magnitude diagram (CMD) for the bulge of M31 at a location ∼1.6 kpc from the galaxy’s center. Using scaled-solar abundance theoretical red giant branches with a range of metallicities, we have translated the observed colors of the stars in the CMD to abundances and constructed a metallicity distr...
متن کاملInvestigating the Andromeda Stream: I. Simple Analytic Bulge-Disk-Halo Model for M31
This paper is the first in a series which studies interactions between M31 and its satellites, including the origin of the giant southern stream. We construct accurate yet simple analytic models for the potential of the M31 galaxy to provide an easy basis for calculation of orbits in M31’s halo. We use an NFW dark halo, an exponential disk, a Hernquist bulge, and a central black hole point mass...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Australia
سال: 2013
ISSN: 1323-3580,1448-6083
DOI: 10.1017/pas.2013.004