Search Publications
A statistical study towards high-mass BGPS clumps with the MALT90 survey
Zhang, Chuan-Peng; Xu, Jin-Long; Liu, Xiao-Lan +2 more
In this work, we perform a statistical investigation towards 50 high-mass clumps using data from the Bolocam Galactic Plane Survey (BGPS) and Millimetre Astronomy Legacy Team 90-GHz survey (MALT90). Eleven dense molecular lines (N2H+(1-0), HNC(1-0), HCO+(1-0), HCN(1-0), HN13C(1-0), H13CO+…
The optical/UV excess of X-ray-dim isolated neutron star II. Nonuniformity of plasma on a strangeon star surface
Chen, Xuelei; Xu, Ren-Xin; Feng, Yi +4 more
Several X-ray-dim isolated neutron stars (XDINSs), also known as the Magnificent Seven, exhibit a Planck-like soft X-ray spectrum. In the optical/ultraviolet (UV) band, there is an excess of radiation compared to an extrapolation from the X-ray spectrum. However, the majority exhibits “spectral deviations”: the fact that there is more flux at long…
Global photometric analysis of Galactic HII regions
Kirsanova, Maria S.; Topchieva, Anastasiia; Wiebe, Dmitri
Total infrared fluxes are estimated for 99 HII regions around massive stars. The following wavebands have been used for the analysis: 8 and 24 µm, based on data from the Spitzer Space Telescope (IRAC and MIPS, respectively); 70, 160, 250, 350 and 500 µm, based on data from the Herschel Space Observatory (PACS and SPIRE). The estimated …
Manifestations of bright points observed in G-band and Ca II H by Hinode/SOT
Lin, Jun; Wu, Ning; Liu, Yan-Xiao
An algorithm was developed for identifying and tracking a magnetic bright point, or bright point (BP) for short, observed in both the photosphere (G-band) and chromosphere (Ca II H), as well as for pairing a photospheric BP (PBP) with its conjugate chromospheric BP (CBP). Two sets of data observed by Hinode/SOT in the quiet Sun near the disk cente…
Analysis of the X-ray emission of OB stars: O stars
Ryspaeva, Elizaveta; Kholtygin, Alexander
We investigate the global properties of X-ray emission from O stars, analyzing the X-ray spectra of 32 O stars from archival data of the XMM-Newton space observatory. We examine two hypotheses about of the origin of X-ray emission from O stars. The first is a paradigm proposed by Pollock, that was revealed from an analysis of the ζ Ori X-ray obser…
Anisotropic power spectrum and the observed low-l power in PLANCK CMB data
Rath, Pranati K.; Zhao, Dong; Chang, Zhe +1 more
In this work, we study a direction dependent power spectrum in anisotropic Finsler space-time. We use this direction dependent power spectrum to address the low-l power observed in WMAP and PLANCK data. The angular power spectrum of the temperature fluctuations has a lower amplitude in comparison to the ΛCDM model in the multipole range l = 2 - 40…
The pc-scale radio structure of MIR-observed radio galaxies
Yuan, Ye; Gu, Min-Feng; Chen, Yong-Jun
We investigated the relationship between the accretion process and jet properties by utilizing very long baseline array (VLBA) and mid-infrared (MIR) data for a sample of 45 3CRR radio galaxies selected with a flux density at 178 MHz > 16.4 {Jy}, 5 GHz very large array (VLA) core flux density ≥ 7 {mJy} and MIR observations. The pc-scale radio s…
Gaia calibrated UV luminous stars in LAMOST
Bai, Yu; Wang, Song; Liu, Ji-Feng
We take advantage of Gaia Data Release 2 to present 275 and 1774 ultraviolet luminous stars in the far ultraviolet (FUV) and near ultraviolet (NUV), respectively. These stars exceed their expected values by 5σ with respect to over one million ultraviolet stars in the log g vs. T eff diagram. Galactic extinction is corrected with a 3D du…
Saturn’s gravitational field induced by its equatorially antisymmetric zonal winds
Anderson, John D.; Schubert, Gerald; Kong, Dali +1 more
The cloud-level zonal winds of Saturn are marked by a substantial equatorially antisymmetric component with a speed of about 50ms-1 which, if they are sufficiently deep, can produce measurable odd zonal gravitational coefficients ΔJ 2k+1, k = 1, 2, 3, 4. This study, based on solutions of the thermal-gravitational wind equatio…
Planetary nebulae in the circumnuclear region of M31: a spectroscopic sample
Dong, Hui; Li, An-Qi; Li, Zhi-Yuan +2 more
Planetary nebulae (PNe) are an important tool for studying the dynamics and chemical evolution of galaxies in the Local Universe, given their characteristic bright emission line spectra. The Andromeda Galaxy (M31) provides a unique laboratory for studying PNe in the circumnuclear region, thanks to its proximity and almost uniformly low line-of-sig…