Search Publications
Element Abundance Analysis of the Metal-rich Stellar Halo and High-velocity Thick Disk in the Galaxy
Shi, Jianrong; Ma, Jun; Du, Cuihua +3 more
Based on the second Gaia data release (DR2) and APOGEE (DR16) spectroscopic surveys, we define two kinds of star samples: high-velocity thick disk (HVTD) with vφ > 90 km s-1 and metal-rich stellar halo (MRSH) with vφ < 90 km s-1. Due to high-resolution spectra data from APOGEE (DR16), we can accura…
Shocked Molecular Hydrogen and Broad CO Lines from the Interacting Supernova Remnant HB 3
Reach, W. T.; Rho, J.; Koo, B. -C. +6 more
We present the detections of shocked molecular hydrogen (H2) gas in near- and mid-infrared and broad CO in millimeter from the mixed-morphology supernova remnant (SNR) HB 3 (G132.7+1.3) using the Palomar Wide-field InfraRed Camera, the Spitzer GLIMPSE360 and Wide-field Infrared Survey Explorer (WISE) surveys, and the Heinrich Hertz Subm…
Network of Star Formation: Fragmentation Controlled by Scale-dependent Turbulent Pressure and Accretion onto the Massive Cores Revealed in the Cygnus-X GMC Complex
Qiu, Keping; Li, Guang-Xing; Cao, Yue
Molecular clouds have complex density structures produced by processes including turbulence and gravity. We propose a triangulation-based method to dissect the density structure of a molecular cloud and study the interactions between dense cores and their environments. In our approach, a Delaunay triangulation is constructed, which consists of edg…
Dust Temperature of Compact Star-forming Galaxies at z ∼ 1-3 in 3D-HST/CANDELS
Chen, Zuyi; Fang, Guanwen; Lin, Zesen +3 more
Recent simulation studies suggest that the compaction of star-forming galaxies (SFGs) at high redshift might be a critical process, during which the central bulge is being rapidly built, followed by quenching of the star formation. To explore dust properties of SFGs with compact morphology, we investigate the dependence of dust temperature, T…
NGC 1605a and NGC 1605b: An Old Binary Open Cluster in the Galaxy
Camargo, Denilso
This work communicates the discovery of a binary open cluster within the Galaxy. NGC 1605 presents an unusual morphology with a sparse stellar distribution and a double core in close angular proximity. The 2MASS and Gaia-EDR3 field-star decontaminated color-magnitude diagrams (CMDs) show two distinct stellar populations located at the same helioce…
Revised Surface Abundances of R Coronae Borealis Stars
Reddy, Arumalla B. S.; Pandey, Gajendra; Hema, B. P.
Surface abundances of 14 (11 majority class and three minority class) R Coronae Borealis stars (RCBs) along with the final-flash object, V4334 Sgr (Sakurai's object) are revised based on their carbon abundances measured from the observed C2 bands; note that the earlier reported abundances were derived using an assumed carbon abundance d…
Relativistic Reflection in NGC 4151
Zdziarski, Andrzej A.; Szanecki, Michał; Niedźwiecki, Andrzej
We investigate the X-ray spectrum of the Seyfert galaxy NGC 4151 using the simultaneous Suzaku/NuSTAR observation and flux-resolved INTEGRAL spectra supplemented by Suzaku and XMM observations. Our best spectral solution indicates that the narrow Fe Kα line is produced in Compton-thin matter at a distance of several hundred gravitational radii. In…
A Possible Kilonova Powered by Magnetic Wind from a Newborn Black Hole
Liu, Yu; Zhang, Bin-Bin; Lü, Hou-Jun +4 more
The merger of binary neutron stars (NS-NS) as the progenitor of short gamma-ray bursts (GRBs) has been confirmed by the discovery of the association of the gravitational-wave (GW) event GW170817 with GRB 170817A. However, the merger product of binary NS remains an open question. An X-ray plateau followed by a steep decay ("internal plateau") has b…
The Heating and Pulsations of V386 Serpentis after Its 2019 Dwarf Nova Outburst
Bell, Keaton J.; Szkody, Paula; Sion, Edward M. +10 more
Following the pulsation spectrum of a white dwarf through the heating and cooling involved in a dwarf nova outburst cycle provides a unique view of the changes to convective driving that take place on timescales of months versus millennia for nonaccreting white dwarfs. In 2019 January the dwarf nova V386 Ser (one of a small number containing an ac…
Complexity of Magnetic-field Turbulence at Reconnection Exhausts in the Solar Wind at 1 au
Miranda, Rodrigo A.; Valdivia, Juan A.; Chian, Abraham C. -L. +1 more
Magnetic reconnection is a complex mechanism that converts magnetic energy into particle kinetic energy and plasma thermal energy in space and astrophysical plasmas. In addition, magnetic reconnection and turbulence appear to be intimately related in plasmas. We analyze the magnetic-field turbulence at the exhaust of four reconnection events detec…