Search Publications
Modeling the Unresolved NIR-MIR SEDs of Local (z < 0.1) QSOs
Geier, S.; Aretxaga, I.; González-Martín, O. +8 more
To study the nuclear (≲1 kpc) dust of nearby (z < 0.1) quasi-stellar objects (QSOs), we obtained new near-infrared (NIR) high angular resolution (~0.″3) photometry in the H and Ks bands for 13 QSOs with available mid-infrared (MIR) high angular resolution spectroscopy (~7.5-13.5 µm). We find that in most QSOs, the NIR emission is unresolv…
Spectroscopically Identified Emission Line Galaxy Pairs in the WISP Survey
Hathi, Nimish P.; Teplitz, Harry I.; Bunker, Andrew J. +20 more
We identify a sample of spectroscopically measured emission line galaxy (ELG) Pairs up to z = 1.6 from the Wide Field Camera 3 (WFC3) Infrared Spectroscopic Parallels (WISP) survey. WISP obtained slitless, near-infrared grism spectroscopy along with direct imaging in the J and H bands by observing in the pure-parallel mode with the WFC3 on board t…
Do Current X-Ray Observations Capture Most of the Black-hole Accretion at High Redshifts?
Papovich, Casey; Yang, Guang; Estrada-Carpenter, Vicente +4 more
The cosmic black hole accretion density (BHAD) is critical for our understanding of the formation and evolution of supermassive black holes (BHs). However, at high redshifts (z > 3), X-ray observations report BHADs significantly (~10 times) lower than those predicted by cosmological simulations. It is therefore paramount to constrain the high-z…
The 3.3 µm Infrared Emission Feature: Observational and Laboratory Constraints on Its Carrier
Tokunaga, Alan T.; Bernstein, Lawrence S.
We examine the self-consistency of laboratory and observational data for potential carriers of the 3.3 µm infrared emission feature (IEF), a member of the ubiquitous family of strong interstellar IEFs at 3.3, 3.4, 6.2, 7.7, 8.6, 11.2, and 12.7 µm. Previous studies have shown that most Galactic sources (reflection nebulae, H II regions,…
NGC 147 Corroborates the Break in the Stellar Mass-Stellar Metallicity Relation for Galaxies
Leethochawalit, Nicha; Kirby, Evan N.; Zhuang, Zhuyun +1 more
The stellar mass-stellar metallicity relation (MZR) is an essential approach to probing the chemical evolution of galaxies. It reflects the balance between galactic feedback and gravitational potential as a function of stellar mass. However, the current MZR of local dwarf satellite galaxies (M* ≲ 108 M⊙; measured f…
Prediction of Soft Proton Intensities in the Near-Earth Space Using Machine Learning
Tiengo, Andrea; Allen, Robert C.; Gastaldello, Fabio +14 more
The spatial distribution of energetic protons contributes to the understanding of magnetospheric dynamics. Based upon 17 yr of the Cluster/RAPID observations, we have derived machine-learning-based models to predict the proton intensities at energies from 28 to 962 keV in the 3D terrestrial magnetosphere at radial distances between 6 and 22 R…
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…