1. Herméneutique et classification

Koposov, Nikolay

doi:10.4000/books.editionsehess.1731

Cited by 4 publications

(4 citation statements)

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“…On the other hand, Teutsch 51, was published earlier as Koposov 52 and KSE18 (Koposov et al 2005, Zolotukhin et al 2006, and then by K06. The main results of Teutsch 51 are found agree somewhat with those of Koposov et al (2008) more than those of K06. However, Fig.…”

Section: Calibration Of the Present Worksupporting

confidence: 69%

“…The main parameters of known previously studied the five clusters (Juchert 9, Kronberger 1, ADS 13292, Teutsch 30 and Teutsch 51) have been re-estimated in the present work and compared with those taken from In this context, the main parameters of Kronberger 1 have been compared with Dias & Webda catalogs, K06 and Koposov et al (2008). We found that our results agree with those of Dias & Webda and K06 more than those of Koposov et al (2008). On the other hand, Teutsch 51, was published earlier as Koposov 52 and KSE18 (Koposov et al 2005, Zolotukhin et al 2006, and then by K06.…”

Section: Calibration Of the Present Workmentioning

confidence: 99%

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Astrophysical parameters of ten poorly studied open star clusters

Tadross

El-Bendary

Osman

et al. 2012

Res. Astron. Astrophys.

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We present here the fundamental parameters of ten open star clusters, nominated from Kronberger et al. (2006) who presented some new discovered stellar groups on the basis of 2MASS photometry and DSS visual images. Star counts and photometric parameters (radius, membership, distances, color excess, age, luminosity function, mass function, total mass, and the dynamical relaxation time) have been determined for these ten clusters for the first time. In order to calibrate our procedures, the main parameters (distance, age, and color excesses) have been re-estimated for another five clusters, which are studied by Kronberger et al. (2006) as well.

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Section: Calibration Of the Present Worksupporting

confidence: 69%

Section: Calibration Of the Present Workmentioning

confidence: 99%

Astrophysical parameters of ten poorly studied open star clusters

Tadross

El-Bendary

Osman

et al. 2012

Res. Astron. Astrophys.

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“…Strigari et al (2008b) note that the ultra-faint dSphs have high central dark matter densities and are good candidates for indirect dark matter detection via gamma-ray emission by particle annihilation. Future wide-field surveys that improve on the sky coverage and photometric depth of the SDSS are likely to discover many additional ultra-faint Milky Way satellites in the coming years (Koposov et al 2007;Walsh et al 2008).…”

Section: Introductionmentioning

confidence: 99%

The Least-Luminous Galaxy: Spectroscopy of the Milky Way Satellite Segue 1

Geha

Willman

Simon

et al. 2009

ApJ

225

294

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We present Keck/DEIMOS spectroscopy of Segue 1, an ultra-low-luminosity M V = −1.5 +0.6 −0.8 Milky Way satellite companion. While the combined size and luminosity of Segue 1 are consistent with either a globular cluster or a dwarf galaxy, we present spectroscopic evidence that this object is a dark matter-dominated dwarf galaxy. We identify 24 stars as members of Segue 1 with a mean heliocentric recession velocity of 206 ± 1.3 km s −1 . Although Segue 1 spatially overlaps the leading arm of the Sagittarius stream, its velocity is 100 km s −1 different from that predicted for recent Sagittarius tidal debris at this position. We measure an internal velocity dispersion of 4.3 ± 1.2 km s −1 . Under the assumption that these stars are gravitationally bound and in dynamical equilibrium, we infer a total mass of 4.5 +4.7 −2.5 × 10 5 M in the mass-follow-light case; using a two-component maximum-likelihood model, we determine a mass within 50 pc of 8.7 +13 −5.2 × 10 5 M . These imply mass-) and M/L V = 2440 +1580 −1775 , respectively. The error distribution of the M/L is nearly lognormal, thus Segue 1 is dark matter-dominated at a high significance. Although we cannot rule out the possibility that Segue 1 has been tidally disrupted, we do not find kinematic evidence supporting tidal effects. Using spectral synthesis modeling, we derive a metallicity for the single red giant branch star in our sample of [Fe/H] = −3.3 ± 0.2 dex. Finally, we discuss the prospects for detecting gamma rays from annihilation of dark matter particles and show that Segue 1 is the most promising satellite for indirect dark matter detection. We conclude that Segue 1 is the least luminous of the ultra-faint galaxies recently discovered around the Milky Way, and is thus the least-luminous known galaxy.

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“…An alternative, and complementary, means of dwarf suppression appeals to reionisation inducing mass loss from low mass dwarfs, with escape velocity < ∼ 20 km/s. This has been implemented in simulations but fails to account for the shape of the observed Milky Way luminosity function of dwarf satellites within 280 kpc (Koposov et al 2007). The observed effective power-law index is α = 0.25 from M V = −2.5 to −18.…”

Section: Galaxy Luminosity Functionmentioning

confidence: 99%

Formation and evolution of disk galaxies

Silk

2008

Proc. IAU

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Abstract. Global star formation is the key to understanding galaxy disk formation. This in turn depends on gravitational instability of disks and continuing gas accretion as well as minor merging. A key component is feedback from supernovae. Primary observational constraints on disk galaxy formation and evolution include the Schmidt-Kennicutt law, the Tully-Fisher relation and the galaxy luminosity function. I will review how theory confronts phenomenology, and discuss future prospects for refining our understanding of disk formation.

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1. Herméneutique et classification

Cited by 4 publications

References 0 publications

Astrophysical parameters of ten poorly studied open star clusters

Astrophysical parameters of ten poorly studied open star clusters

The Least-Luminous Galaxy: Spectroscopy of the Milky Way Satellite Segue 1

Formation and evolution of disk galaxies

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