Vlt Extra Stars

This image from ESO's Very Large Telescope (VLT) shows the newly discovered planet HD95086 b, next to its parent star. The observations were made using NACO, the adaptive optics instrument for the VLT in infrared light, and using a technique called differential imaging, which improves the contrast between the planet and its dazzling host star. The star itself has been removed from the picture during processing to enhance the view of the faint exoplanet and its position is marked. The exoplanet appears at the lower left.

The blue circle is the size of the orbit of Neptune in the Solar System. Dr slot roulette video poker.

The star HD 95086 has similar properties to Beta Pictoris and HR 8799 around which giant planets have previously been imaged at separations between 8 and 68 astronomical units. These stars are all young, more massive than the Sun, and surrounded by a debris disc.

T Tauri Stars in the Large Magellanic Cloud: A Combined HST and VLT Effort Martino Romaniello, Nino Panagia, Salvatore Scuderi, Roberto Gilmozzi, Eline Tolstoy, Fabio Favata et al. If you're looking to play one of the biggest stars of the online slot game market – then it's probably time you played 'Extra Stars' the fun online slot game from EGT. The star of the game is a Wild Star that has the power to expand to cover any reel it lands on, and then substitute for all other symbols to create loads of additional prizes.

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VLT-VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies. II. Evidence for shock ionization caused by tidal forces in the extra-nuclear regions of interacting and merging LIRGs

Abstract

Context. Luminous infrared galaxies (LIRGs) are an important class of objects in the low-z universe bridging the gap between normal spirals and the strongly interacting and starbursting ultraluminous infrared galaxies (ULIRGs). Since a large fraction of the stars in the Universe have been formed in these objects, LIRGs are also relevant in a high-z context. Studies of the two-dimensional physical properties of LIRGs are still lacking.
Aims: We aim to understand the nature and origin of the ionization mechanisms operating in the extra-nuclear regions of LIRGs as a function of the interaction phase and infrared luminosity.
Methods: This study uses optical integral field spectroscopy (IFS) data obtained with VIMOS. Our analysis is based on over 25 300 spectra of 32 LIRGs covering all types of morphologies (isolated galaxies, interacting pairs, and advanced mergers), and the entire 1011-1012 L infrared luminosity range.
Results: We found strong evidence for shock ionization, with a clear trend with the dynamical status of the system. Specifically, we quantified the variation with interaction phase of several line ratios indicative of the excitation degree. While the [N ii]λ6584/Hα ratio does not show any significant change, the [S ii]λλ6717,6731/Hα and [O i]λ6300/Hα ratios are higher for more advanced interaction stages. Velocity dispersions are higher than in normal spirals and increase with the interaction class (medians of 37, 46, and 51 km s-1 for class 0-2, respectively). We constrained the main mechanisms causing the ionization in the extra-nuclear regions (typically for distances ranging from ~0.2-2.1 kpc to ~0.9-13.2 kpc) using diagnostic diagrams. Isolated systems are mainly consistent with ionization caused by young stars. Large fractions of the extra-nuclear regions in interacting pairs and more advanced mergers are consistent with ionization caused by shocks of vs ⪉ 200 km s-1. This is supported by the relation between the excitation degree and the velocity dispersion of the ionized gas, which we interpret as evidence for shock ionization in interacting galaxies and advanced mergers but not in isolated galaxies. This relation does not show any dependence with the infrared luminosity (i.e. the level of star formation). All this indicates that tidal forces play a key role in the origin of the ionizing shocks in the extra-nuclear regions. We also showed for the first time what appears to be a common log([O i]λ6300/Hα) - log (σ) relation for the extranuclear ionized gas in interacting (U)LIRGs (i.e. covering the entire 1011.0-1012.3 L luminosity range). This preliminary result needs to be investigated further with a larger sample of ULIRGs.

Vlt

Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile (ESO Programs 076.B-0479(A), 078.B-0072(A) and 081.B-0108(A)).Figures 14-17 are only available in electronic form at http://www.aanda.org


Publication:

Vlt Extra Stars Meaning

Pub Date:
July 2010
DOI:
10.1051/0004-6361/200913239
arXiv:
arXiv:1004.3933
Bibcode:
2010A&A..517A.28M
Keywords:
  • galaxies: active;
  • galaxies: interactions;
  • galaxies: starburst;
  • infrared: galaxies;
  • Astrophysics - Cosmology and Nongalactic Astrophysics

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E-Print:

Vlt Extra Stars Tv

Accepted for publication in Astronomy and Astrophysics. Some figures were removed due to space limitations. A version with the whole set of figures can be seen at http://www.damir.iem.csic.es/extragalactic/publications/publications.html