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... Research interests mostly related to galaxy formation and evolution, by means of detailed observations on lowish-redshift galaxies: . The interplay between the different components of the ISM in early-type galaxies . Globular cluster systems across the Hubble sequence (photometry and spectroscopy) . The formation of bulges of spiral galaxies: stellar population gradients . Central dark masses in early-type galaxies and their relation to radio properties . ... 3/24/1998 ...

... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

... The history of star formation was successfully analyzed for the first time based on the spectra of the stellar population of dwarf galaxies of low surface brightness outside the Local Group. We have investigated the stellar population of two dwarf spheroidal galaxies KDG61 and KDG64 in the central part of a close group of galaxies M81. ... These galaxies are dominated by the old stellar population (12-14 billion years) of low metallicity ([Fe/H] ~ -1.5). ... KDG61 . ... KDG64 ...

The catalogue of internal stellar kinematics of galaxies . HyperLeda home | Documentation | ... The literature has been scanned with the scope of gathering the published measurements of the central velocity dispersion and the maximum rotational velocity. ... The compilation is presented in three parts: (a) the central velocity dispersion catalogue, (b) the maximum rotational velocity catalogue, and (c) the bibliography. (a) The central velocity dispersion catalogue (Table A1) . ... HyperLeda . ...

Formation of intra-group HI gas through multiple galaxy encounters and ram pressure stripping Kenji Bekki (ICRAR at UWA, Australia) (Figures from APOD) Physical processes that drive galaxy evolution in different environments. (a) Ram pressure stripping due to hot intergalactic medium in clusters. ... Ram pressure of warm/hot intra-group gas on extended gaseous (HI) disks of galaxies in small groups and filaments (with Westmeier T. et al. ... 2011) Gas kinematics of disk galaxies under ram pressure. ...

... Each day we feature a different image or photograph of our fascinating universe, along with a brief explanation written by a professional astronomer. October 1, 1995 . Central Galactic Star Bursts . Credit: NASA , HST , WFPC 2, J. Gallagher, ( U. Wisconsin-Madison ) . Explanation: The pictured core of the galaxy NGC 253 shows an exceptionally high rate of star formation. ... Galaxies where such high star formation rates are seen are called "starburst" galaxies. ... About APOD | ...

... Since IRS 7 at the Galactic center was identified as a luminous red supergiant (Lebofsky et al. 1982), a lasting debate has been initiated whether the nucleus of the Milky Way galaxy had experienced a recent star formation episode. ... 1993). ... 1994). ... Tamblyn & Rieke (1993) and Schaerer (1994) proposed starburst models which would be able to account for a young stellar population at the Galactic center, although the origin of some peculiar hot stars still remains to be explained (Tamblyn et al...

Since the first stars and then galaxies formed the Universe has been an immense factory converting neutral gas into stellar material. ... In this seminar I will discuss recent results from the Galaxy And Mass Assembly (GAMA) survey, probing the assembly of stellar mass though both in-situ star formation (as traced by multiple SFR indicators) and interactions (both mergers and interaction induced star-formation) - in galaxies spanning ~4 decades in stellar mass. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... The present-day DD population is examined as a function of Galactic star-formation history alone. It is shown that the frequency distribution, in particular, is a sensitive function of the Galactic star formation history and could be used to measure the time since the last major star-formation epoch. ... Last Revised: 2012 November 22nd . ...

... Numerical simulations of cosmic structure formation and evolution are now suggesting that a galaxy-cosmic web connection might be the key ingredient for regulating galaxy evolution, including the morphological type, star formation history and gas content. ... This is why the most basic questions remain 50 years after the first attempts to detect intergalactic gas: Is the intergalactic medium driving star formation? ... Last updated:09:26:07 05-Mar-2015 . ...

... Right: cold gas traced by [CII] emission (red) accreting onto a primeval galaxy (green) at z=7.1 ( Maiolino et al. 2015 ) (image credit: ALMA Press Release ) . ... 2010 , Cicone, Maiolino et al. ... 2012 , Cicone, Maiolino et al. ... Right: observed distribution of the average stellar metallicities of passive and star forming galaxies in the local universe, supporting starvation/strangulation as primary quenching mechanism in low/intermediate mass galaxies ( Peng, Maiolino, Cochrane 2015 ). ...

Class 1 Introduction, Background History of Modern Astronomy The Night Sky, Eclipses and the Seasons Kepler's Laws Newtonian Gravity General Relativity Matter and Light Telescopes Class 2 Solar System Characteristics Formation Exosolar Planets Class 3 Stars The S un Stellar Evolution of Low and High Mass Stars Deaths of Stars Exotic Stars Class 4 Galaxies Galaxy Classification Formation of Galaxies Galactic ... Low mass stars live and die differently than high mass stars. ...

. Pulkovo Observatory of Russian Academy of Sciences is situated . near Saint-Petersburg. It was founded in 1839. 196140, Saint-Petersburg, Pulkovskoye chaussee 65/1 . English version . Russian version . This page has been accessed times since May 1, 1999.

HIGH MASS X-RAY BINARIES AND RECENT STAR FORMATION HISTORY P. Shtykovskiy 1 1,2 and M. Gilfanov 2,1 Space Research Institute of Russian Academy of Sciences, Moscow, Russia 2 Max-Planck-Institut fur Astrophysik, Garching b. Munchen, Germany Ё Ё ABSTRACT Based on the XMM-Newton observations of Magellanic Clouds we consider the dependence of population of high mass X-ray binaries on the recent star formation history in the host galaxy. ... HMXBS AND RECENT STAR FORMATION IN MAGELLANIC CLOUDS 4.1. ...

Next: HST-NICMOS Observations of Galactic Up: NICMOS Science Previous: A Color Analysis of . ... Why choose NGC 1569? ... NICMOS Data in the Central Region of NGC 1569 . ... To have a census of the old stellar populations of the dwarf irregular galaxies NGC 1569 and NGC 1705 and to trace the major episodes of star formation over a Hubble time in these starbursting systems, we have applied for and obtained HST/NICMOS observations in the F110W and F160W bands with the NIC2 camera. ...

... Spiral galaxies viewed face-on display a grand design, with graceful spiral arms traced by bright star clusters and glowing stellar nurseries. ... Space Station Shows Off New Robot Arm . ... GRO J1655 40: Evidence for a Spinning Black Hole . ... In the center of a swirling whirlpool of hot gas is likely a beast that has never been seen directly: a black hole. ... The Orion Nebula is a nuturing stellar nursery filled with hot young stars and their natal clouds of gas and dust. ...

XMM­Newton CCF Release Note XMM­CCF­REL­121 EPIC Spectral Response Distribution R. D. Saxton, D. Lumb 12 July 2002 1 CCF components Name of CCF VALDATE Blocks changed CAL VERSION XSCS flag EMOS1 QUANTUMEF 0012.CCF 2000­01­01 QE TOTAL, QE CCD1 NO EMOS2 QUANTUMEF 0012.CCF 2000­01­01 QE TOTAL, QE CCD1 NO 2 Changes The MOS quantum efficiencies (QE) have been modified to give a better fit to ground calibration data. ... Energy data points were subject to statistical errors of several %. ...

... All the galaxies are divided into 4 groups depending on the environment type; every subsample contains more than 10 galaxies. ... An effect of environments is seen both for the nuclei and for the bulges: if we consider the clusters (Virgo and Ursa Ma jor) and group centers as dense environments and the field and group periphery as sparse environments, then in the dense environments the stellar populations of S0s are in average older by 4­5 Gyr than in the sparse ones. ...