نتایج جستجو برای: galaxies individual andromeda i
تعداد نتایج: 1476211 فیلتر نتایج به سال:
We present images showing the first detections of polarization on parsec scales in the nuclei of four Fanaroff-Riley type I (low-luminosity) radio galaxies. Observations with Very Long Baseline Interferometry at λ 3.6cm reveal the presence of ordered magnetic fields within ∼1650 Schwarzchild radii of the putative central supermassive black hole. The relatively high fractional polarization in th...
Hubble Space Telescope V, I photometry of stars in the Large Magellanic Cloud cluster NGC 1866 shows a well defined cluster main sequence down to V=25 mag, with little contamination from field or foreground stars. We use the main sequence fitting procedure to link the distance of NGC 1866 to the Hipparcos determination of the distance for the Hyades MS stars, making use of evolutionary prescrip...
The paradigm of the neutralino dark matter predicts that the first gravitationally bound objects are earth-mass sized microhaloes, which would emit annihilation gamma-rays. Here we show that, though the flux from individual nearest microhaloes is extremely difficult to detect, meaningful constraints on their survival probability and internal density profile can be set by requiring that the gala...
Abstract Observing nearby galaxies with submillimeter telescopes on the ground has two major challenges. First, brightness is significantly reduced at long wavelengths compared to peak of dust emission. Second, it necessary use a high-pass spatial filter remove atmospheric noise large angular scales, which unwelcome side effect also removing galaxy’s large-scale structure. We have developed tec...
Mid-infrared observations of the Andromeda galaxy, M31, obtained with the Infrared Array Camera on board the Spitzer Space Telescope are presented. The image mosaics cover areas of approximately 3. • 7 × 1. • 6 and include the satellite galaxies M32 and NGC 205. The appearance of M31 varies dramatically in the different mid-infrared bands, from the smooth bulge and disk of the old stellar popul...
Mid-infrared observations of the Andromeda galaxy, M31, obtained with the Infrared Array Camera on board the Spitzer Space Telescope are presented. The image mosaics cover areas of approximately 3. • 7 × 1. • 6 and include the satellite galaxies M32 and NGC 205. The appearance of M31 varies dramatically in the different mid-infrared bands, from the smooth bulge and disk of the old stellar popul...
We present the method behind HubPUG, a software tool built for recovering systemic proper motions (PMs) of Hubble Space Telescope (HST) fields with two epochs observations by utilizing stars observed Gaia as foreground frame reference. HST PM experiments have typically relied on use distant background galaxies or quasi-stellar objects (QSOs) stationary sources against which to measure PMs. With...
We report on VLA H i spectral line observations of five early-type galaxies classified as optically peculiar due to the presence of jets, ripples or other optical “fine structure”. We detect H i within the primary beam (30 HPBW) in four of the five systems. However, in only one case is this gas associated with the targeted elliptical galaxy. In the other cases the H i is associated with a nearb...
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