scholarly journals INFORMATION ON THE MILKY WAY FROM THE TWO MICRON ALL SKY SURVEY WHOLE SKY STAR COUNT: THE STRUCTURE PARAMETERS

2011 ◽  
Vol 740 (1) ◽  
pp. 34 ◽  
Author(s):  
Chan-Kao Chang ◽  
Chung-Ming Ko ◽  
Ting-Hung Peng
Keyword(s):  
Milky Way ◽  
Structure Parameters ◽  
Sky Survey ◽  
Star Count

scholarly journals CONSTRAINTS ON THE SHAPE OF THE MILKY WAY DARK MATTER HALO FROM JEANS EQUATIONS APPLIED TO SLOAN DIGITAL SKY SURVEY DATA

2012 ◽  
Vol 758 (1) ◽  
pp. L23 ◽  
Author(s):  
Sarah R. Loebman ◽  
Željko Ivezić ◽  
Thomas R. Quinn ◽  
Fabio Governato ◽  
Alyson M. Brooks ◽  
...  
Keyword(s):  
Dark Matter ◽  
Survey Data ◽  
Milky Way ◽  
Sloan Digital Sky Survey ◽  
Dark Matter Halo ◽  
Sky Survey

scholarly journals Estimation of Galactic model parameters in high latitudes with the SDSS and SCUSS

2013 ◽  
Vol 9 (S298) ◽  
pp. 404-404
Author(s):  
Cuihua Du ◽  
Yunpeng Jia ◽  
Xiyan Peng
Keyword(s):  
Model Parameters ◽  
High Latitudes ◽  
The South ◽  
Statistical Errors ◽  
Count Method ◽  
Sky Survey ◽  
Star Count ◽  
The Galaxy ◽  
Galactic Model

AbstractBased on the South Galactic Cap U-band Sky Survey (SCUSS) and SDSS observation, we adopted the star-count method to analyze the stellar distribution in different directions of the Galaxy. We find that these model parameters may be variable with observed direction, which cannot simply be attributed to statistical errors.

scholarly journals The Milky Way Revealed by Variable Stars. I. Sample Selection of RR Lyrae Stars and Evidence for Merger History

2022 ◽  
Vol 258 (1) ◽  
pp. 20
Author(s):  
Iminhaji Ablimit ◽  
Gang Zhao ◽  
Uy. Teklimakan ◽  
Jian-Rong Shi ◽  
Kunduz Abdusalam
Keyword(s):  
Milky Way ◽  
Sample Selection ◽  
Variable Stars ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Sky Survey ◽  
Spectroscopic Information ◽  
History Of ◽  
Dual Origin ◽  
Lyrae Stars

Abstract In order to study the Milky Way, RR Lyrae (RRL) variable stars identified by Gaia, ASAS-SN, and ZTF sky survey projects have been analyzed as tracers in this work. Photometric and spectroscopic information of 3417 RRLs including proper motions, radial velocity, and metallcity are obtained from observational data of Gaia, LAMOST, GALAH, APOGEE, and RAVE. Precise distances of RRLs with typical uncertainties less than 3% are derived by using a recent comprehensive period–luminosity–metallicity relation. Our results from kinematical and chemical analysis provide important clues for the assembly history of the Milky Way, especially for the Gaia–Sausage ancient merger. The kinematical and chemical trends found in this work are consistent with those of recent simulations that indicated that the Gaia–Sausage merger had a dual origin in the Galactic thick disk and halo. As recent similar works have found, the halo RRL sample in this work contains a subset of radially biased orbits besides a more isotropic component. This higher orbital anisotropy component amounts to β ≃ 0.8, and it contributes between 42% and 83% of the halo RRLs at 4 < R( kpc) < 20.

A discussion on infared astronomy - A far infrared sky survey

1969 ◽  
Vol 264 (1150) ◽  
pp. 267-271 ◽  
Keyword(s):  
Milky Way ◽  
Angular Resolution ◽  
Thermal Emission ◽  
Far Infrared ◽  
The Moon ◽  
Sky Survey ◽  
Upper Limits ◽  
Celestial Sphere ◽  
Thick Source ◽  
Thin Source

A balloon-borne instrument for making far infrared sky surveys with 2° angular resolution is described. In two initial flights at a wavelength of 320 μm approximately half of the celestial sphere including most of the northern milky way was surveyed. The thermal emission of the moon was alone detected. The upper limit to the flux from other sources was 3 x 10-12 W cm-2 in the 300 to 360 μm band, or approximately 2 x 10-23 W cm-2 Hz-1. A blackbody (optically thick) source 2° or greater in diameter yielding this flux would have a temperature of 10 °K. A warmer, small or optically thin source providing this much radiation in the Rayleigh-Jeans tail of the Plank distribution would have a temperature averaged over the 2° beam of 0.6 °K. These observations can be used to set upper limits to the opacity and temperature of interstellar grains.

scholarly journals Galactic structure studies with SCUSS and SDSS surveys

2012 ◽  
Vol 8 (S295) ◽  
pp. 309-310
Author(s):  
Cuihua Du ◽  
Xiyan Peng
Keyword(s):  
Galactic Halo ◽  
Galactic Structure ◽  
Scale Height ◽  
Thick Disk ◽  
Axis Ratio ◽  
Statistical Errors ◽  
Count Method ◽  
Sky Survey ◽  
Star Count ◽  
The Galaxy

AbstractBased on the South Galactic Cap U-band Sky Survey (SCUSS) and SDSS observations, we adopted the star-count method to analyze the stellar distribution in different directions of the Galaxy. We find that the scale height of the disk may be variable with the observed direction, which cannot simply be attributed to statistical errors. The main reason can be possibly attributed to the disk (mainly the thick disk) being flared, with a scale height increasing with radius. The axis ratio of the Galactic halo is in the range 0.4-0.6. This finding supports Galactic models with a flattened inner halo, partly formed through a merger early in the Galaxy's history.

scholarly journals THE MILKY WAY TOMOGRAPHY WITH SLOAN DIGITAL SKY SURVEY. IV. DISSECTING DUST

2012 ◽  
Vol 757 (2) ◽  
pp. 166 ◽  
Author(s):  
Michael Berry ◽  
Željko Ivezić ◽  
Branimir Sesar ◽  
Mario Jurić ◽  
Edward F. Schlafly ◽  
...  
Keyword(s):  
Milky Way ◽  
Sloan Digital Sky Survey ◽  
Sky Survey

scholarly journals Atlas and Catalog of Dark Clouds Based on Digitized Sky Survey I

2005 ◽  
Vol 57 (sp1) ◽  
pp. S1-S386 ◽  
Author(s):  
Kazuhito Dobashi ◽  
Hayato Uehara ◽  
Ryo Kandori ◽  
Tohko Sakurai ◽  
Masahiro Kaiden ◽  
...  
Keyword(s):  
Physical Parameters ◽  
Galactic Latitude ◽  
Entire Region ◽  
Optical Extinction ◽  
Dark Clouds ◽  
Latitude Range ◽  
Cloud Parameters ◽  
Sky Survey ◽  
Star Count

Abstract We present a quantitative atlas and catalog of dark clouds derived by using the optical database “Digitized Sky Survey I”. Applying a traditional star-count technique to 1043 plates contained in the database, we produced an $A_V$ map covering the entire region in the galactic latitude range $\vert b\vert \le 40^\circ$. The map was drawn at two different angular resolutions of $6'$ and $18'$, and is shown in detail in a series of figures in this paper. Based on the $A_V$ map, we identified 2448 dark clouds and 2841 clumps located inside them. Some physical parameters, such as the position, extent, and optical extinction, were measured for each of the clouds and clumps. We also searched for counterparts among already known dark clouds in the literature. The catalog of dark clouds presented in this paper lists the cloud parameters as well as the counterparts.

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