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Assessing the galaxy population out to z ∼ 2 using the Hubble Deep Field South
Horellou, C.; Wiegert, T.; de Mello, D. F.
In this work we use the Hubble Deep Field South (HDF-S) version 2 images to assess the galaxy population out to z ∼ 2. We have used two methods of templates fitting of the spectral energy distributions to obtain photometric redshifts and classify the objects. The Bayesian photometric redshifts gave better results when compared with 54 spectroscopi…
Dynamics of the Globular Cluster NGC 6656 with WFPC2
Chen, Li; Chen, Ding; Wang, Jia-Ji
We have used the Hubble Space Telescope observations to measure proper motion of the globular cluster NGC 6656 (M22) with respect to the background bulge stars and its internal velocity dispersion profile. Based on the proper motion of the cluster, its space velocity (Pi,Theta,W) = (184+/-3, 209+/-14, 132+/-15) km s-1 and galactic orbit…
Multi-point Cluster Observations of VLF Risers Fallers and Hooks at and near the Plasmapause
Gurnett, D. A.; Balogh, A.; Pickett, J. S. +11 more
Temporal-spatial structure of magnetic merging at the magnetopause inferred from 557.7-nm all-sky images
Balogh, A.; Lester, M.; Scudder, J. +7 more
Available from http://www.copernicus.org/site/EGU/annales/22/8/2917.htm?FrameEngine=false;
Age-dating a star-burst with GEMINI/CIRPASS observations of the core of M83
Knapen, J. H.; Sharp, R. G.; Ryder, S. D. +2 more
We present preliminary results from a set of near-IR integral field spectroscopic observations of the central, star-burst, regions of the barred spiral galaxy M83, obtained with CIRPASS on Gemini-S. We present maps in the Paβ and [Fe{II}] ,1.257 µm emission lines which appear surprisingly different. We outline the procedure in which we will …
Evidence for chaotic dynamics in the Jovian magnetosphere
Sarris, E. T.; Anagnostopoulos, G. C.; Pavlos, G. P. +2 more
In this paper, for the first time we examine the hypothesis of chaotic behaviour for the dynamics of the inner of Jupiter's magnetosphere as which is appeared in energetic populations. For this, we study geometrical and dynamical characteristics of Jovian energetic ion time series in the reconstructed phase space by using the SVD extended chaotic …
An unusual high-ionization nebula in NGC 55
Rosa, M. R.; Tüllmann, R.
We report on the detection of a previously unknown extended low-density nebula of very high temperature and excitation, TR 001507.7-391206, located above the midplane of NGC 55. The nebular emission line spectrum, in which He II is present, is consistent with photoionization by about 3 very hot massive O3 or WR-type stars. There are no indications…
Initial mass function in the South-Western part of M 31
Borisov, G.; Nedialkov, P.; Veltchev, T.
We derive an average initial mass function (IMF) for 50 OB associations in the South-Western part of Andromeda galaxy, combining ultraviolet photometry of Hill et al. (\cite{Hill95}, ApJ, 98, 595) and two datasets HST photometry with JHKs photometry from the 2MASS + I band photometry from Magnier et al. (\cite{Magnier92}, A&A, 96, 3…
Properties of serendipitous X-ray flares discovered in XMM-Newton observations
Ramsay, Gavin; Trenholme, Duncan; Foley, Carl
We present the results of a search of the XMM-Newton public data archive for stellar X-ray flares. We find eight flaring sources for which we identify seven optical counterparts. Three of these sources have distance estimates which allow us to determine their luminosities. Based on the decay time of the flares and their luminosity, we derive loop …
Comparison of GONG and MDI solar p-mode background
Hill, F.; Barban, C.
Using Severino's model, we estimate the amount of coherent correlated and uncorrelated background and incoherent noise components needed to reproduce the following four helioseismic spectra: V power, I power, V-I phase difference and V-I coherence, using GONG and MDI data. We confirm that a coherent correlated component of 10-15% of the total back…