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We search for galaxies with a strong Balmer break (Balmer Break Galaxies; BBGs) at $z \sim 6$ over a 0.41 deg$^2$ effective area in the COSMOS field. Based on rich imaging data, including data obtained with the Atacama Large…

Age-metallicity relation for the Galactic disc is a crucial tool and to constrain the Galactic chemical evolution models. We investigate the age-metallicity relation of the Galactic disc using the red giant branch stars in the Solar…

星系天体物理 · 物理学 2023-05-01 S. Doner , S. Ak , O. Onal Tas , O. Plevne

We present a theoretical model for the evolution of mass, angular momentum and size of galaxy disks and bulges, and we implement it into the semi-analytic galaxy formation code SAGE. The model follows both secular and violent evolutionary…

星系天体物理 · 物理学 2016-04-27 Chiara Tonini , Simon J. Mutch , Darren J. Croton , J. Stuart B. Wyithe

A comprehensive picture of high-mass star formation has remained elusive, in part because examples of high-mass YSOs tend to be relatively distant, deeply embedded, and confused with other emission sources. These factors have impeded…

天体物理学 · 物理学 2009-11-13 L. D. Matthews , C. Goddi , L. J. Greenhill , C. J. Chandler , M. J. Reid , E. M. L. Humphreys

We investigate the kinematics of the intermediate population using the photometric and astrometric sample surveys towards two opposite directions (galactic centre and anticentre) at intermediate latitude. A multivariate discriminant…

天体物理学 · 物理学 2007-05-23 Devendra Ojha , Annie C. Robin , Olivier Bienayme

We describe the motivation, field locations and stellar selection for the ARGOS spectroscopic survey of 28,000 stars in the bulge and inner disk of the Milky Way galaxy across latitudes of b = -5 deg to -10 deg. The primary goal of this…

星系天体物理 · 物理学 2012-12-10 K. Freeman , M. Ness , E. Wylie de Boer , E. Athanassoula , J. Bland Hawthorn , M. Asplund , G. Lewis , D. Yong , R. Lane , L. Kiss , R. Ibata

We aim to identify the stellar populations (mostly red giants and young stars) detected in the ISOGAL survey at 7 and 15micron towards a field (LN45) in the direction l=-45, b=0.0. The sources detected in the survey of the Galactic plane by…

天体物理学 · 物理学 2009-11-13 S. Ganesh , A. Omont , U. C. Joshi , K. S. Baliyan , M. Schultheis , F. Schuller , G. Simon

We present an extensive sample of ultra-wide binary stars in the solar neighborhood, focusing on separations of $0.01<s/{pc}<1$. Using data from Gaia DR2, we define kinematic sub-populations via the systems' tangential velocities, i.e.,…

星系天体物理 · 物理学 2020-01-08 Hai-Jun Tian , Kareem El-Badry , Hans-Walter Rix , Andrew Gould

We present a study of MSX point sources in the Galactic bulge (|l| < 3 deg, 1 deg < |b| < 5 deg), observed at A, C, D and E-band (8 to 21 micron), with a total area ~ 48 deg^2. We discuss the nature of the MSX sources (mostly AGB stars),…

天体物理学 · 物理学 2007-08-07 D. K. Ojha , A. Tej , M. Schultheis , A. Omont , F. Schuller

Near- and mid-IR survey data from DENIS and ISOGAL are used to investigate the structure and formation history of the inner 10 degree (1.4 kpc) of the Milky Way galaxy. Synthetic bolometric corrections and extinction coefficients in the…

We investigate which conditions of dust attenuation and stellar populations allow models of dusty, continuously star-forming, bulge-less disk galaxies at 0.8<z<3.2 to meet the different colour selection criteria of high-z ``red'' galaxies…

天体物理学 · 物理学 2009-11-13 D. Pierini , C. Maraston , K. D. Gordon , A. N. Witt

The Galactic disk is expected to be spatially, kinematically, and chemically clustered on many scales due to both star formation and non-axisymmetries in the Galactic potential. In this work we calculate the spatial and kinematic two-point…

星系天体物理 · 物理学 2021-11-24 Harshil Kamdar , Charlie Conroy , Yuan-Sen Ting , Kareem El-Badry

We present the results of two-component (disc+bar) and three-component (disc+bar+bulge) multiwavelength 2D photometric decompositions of barred galaxies in five SDSS bands ($ugriz$). This sample of $\sim$3,500 nearby ($z<0.06$) galaxies…

We present H$\alpha$ gas kinematics for 178 star-forming galaxies at z~2 from the MOSFIRE Deep Evolution Field survey. We have developed models to interpret the kinematic measurements from fixed-angle multi-object spectroscopy, using…

We present a proper motion mini-survey of 35 fields in the vicinity of Baade window, (l, b) = (1 deg, -4 deg), sampling roughly a 5 x 2.5 deg region of the Galactic bar. Our second epoch observations collected with the ACS/HRC instrument on…

天体物理学 · 物理学 2009-11-11 S. Kozlowski , P. R. Wozniak , S. Mao , M. C. Smith , T. Sumi , W. T. Vestrand , L. Wyrzykowski

We examine the thirteen most luminous sources in the WMAP free-free map using the Spitzer GLIMPSE and MSX surveys to identify massive star formation regions, emitting one-third of the Galactic free-free luminosity. We identify star forming…

星系天体物理 · 物理学 2010-07-28 Mubdi Rahman , Norman Murray

In order to perform a detailed study of the stellar kinematics in the vertical axis of bars, we obtained high signal-to-noise spectra along the major and minor axes of the bars in a sample of 14 face-on galaxies, and used them to determine…

天体物理学 · 物理学 2009-11-11 Dimitri A. Gadotti , Ronaldo E. de Souza

The inner ~200 pc region of the Milky Way contains a nuclear stellar disc and a nuclear star cluster that are embedded in the larger Galactic bar. These stellar systems overlap spatially, which makes it challenging to separate stars that…

星系天体物理 · 物理学 2025-07-16 A. Feldmeier-Krause , T. Veršič , G. van de Ven , E. Gallego-Cano , N. Neumayer

Infrared photometry in the J (1.2 microns), H (1.7 microns), Ks (2.2 microns) bands from the 2MASS catalogue and in the W1 (3.4 microns), W2 (4.6 microns), W3 (12 microns), W4 (22 microns) bands from the WISE catalogue is used to reveal the…

星系天体物理 · 物理学 2019-10-25 George Gontcharov

Using Multi-Unit Spectroscopic Explorer (MUSE) spectroscopy, we analyse the stellar kinematics of 18 brightest group early-type (BGEs) galaxies, selected from the Complete Local-Volume Groups Sample (CLoGS). We analyse the kinematic maps…

星系天体物理 · 物理学 2022-07-06 S. I. Loubser , P. Lagos , A. Babul , E. O'Sullivan , S. L. Jung , V. Olivares , K. Kolokythas