【摘 要】
:
The Central Molecular Zone (CMZ) is a ring-like structure sitting at the center of the Milky Way.Using the 870 μtm continuum map from the APEX Telescope Large Area Survey of the Galaxy(ATLASGAL),we study anisotropy in the density structure of gas in the C
【机 构】
:
National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;University of C
论文部分内容阅读
The Central Molecular Zone (CMZ) is a ring-like structure sitting at the center of the Milky Way.Using the 870 μtm continuum map from the APEX Telescope Large Area Survey of the Galaxy(ATLASGAL),we study anisotropy in the density structure of gas in the CMZ utilizing the 2D correlation function.To quantify the spatial anisotropy,we define the critical angle θhalf,as well as the anisotropy parameter A ≡ π/4θhalf-1.We find that the density structure is strongly anisotropic at a large scale (~100 pc),and the degree of spatial anisotropy decreases with decreasing scale.At the scale of ~ 10 pc,the structure is still mildly anisotropic.In our analyses,we provide a quantitative description of the anisotropic density structure of gas in the CMZ,and the formalism can be applied to different regions to study their differences.
其他文献
The red giant branch (RGB) of globular clusters (GCs) is home to some exotic stars,which may provide clues on the formation of multiple stellar populations in GCs.It is well known that binary interactions are responsible for many exotic stars.Thus,it is i
This paper reports analysis of an eclipsing binary system KIC5197256 with a δ Sct variable component.Utilizing light-curve modeling,several stellar parameters are derived,e.g.,temperature,mass,and mass ratio.The O-C diagram is a straight line with a negat
Lucky imaging is a high-resolution astronomical image recovery technique with two classic implementation algorithms,i.e.image selecting,shifting and adding in image space,and data selecting and image synthesizing in Fourier space.This paper proposes a nov
Results from optical CCD photometric observations of 13 pre-main-sequence stars collected during the period from February 2007 to November 2020 are presented.These stars are located in the association Cepheus OB3,in the field of the young star V733 Cephei
Two-way Doppler measurement is a typical Earth-based radiometric technique for interplanetary spacecraft navigation and gravity science investigation.The most widely used model for the computation of two-way Doppler observables is Moyer\'s differenced-r
Asteroseismic observations are crucial to constrain stellar models with precision.Bayesian Estimation of STellar Parameters (BESTP) is a tool that utilizes Bayesian statistics and nested sampling Monte Carlo algorithm to search for the stellar models that
The first photometric analysis of V811 Cep was carried out.The first complete light curves of V,R and I bands are given.The analysis was carried out by the Wilson-Devinney (W-D) program,and the results show that V811 Cep is a median-contact binary (f =33.
A new orbit of Triton was provided by our previous work,benefitted by new Gaia Data,both in a new precise reduction of charge-coupled device observations and in the planetary ephemeris INPOP 19a.In this paper,we provide a new ephemeris for another main Ne
We present the first photometric analysis of three totally-eclipsing W UMa binaries,NSVS 2443858,NSVS 780649 and V1098 Her.The absolute astrophysical parameters of the stellar components were determined by means of Gaia distances and light curve solutions
This work presents a time-series photometric variability survey of the young open cluster NGC 869.More than 13000 CCD frames in the BV filters were collected on 19 nights between 2014 November 6 and 2014 December 24.In a 20′× 20′ field centered on the clu