Search Publications
Dissecting Nearby Galaxies with piXedfit. II. Spatially Resolved Scaling Relations among Stars, Dust, and Gas
Tacchella, Sandro; Wu, Po-Feng; Morishita, Takahiro +5 more
We study spatially resolved scaling relations among stars, dust, and gas in ten nearby spiral galaxies. In a preceding paper, we have derived spatially resolved properties of the stellar population and dust by a panchromatic spectral energy distribution fitting using piXedfit. Now, we investigate resolved star formation ( ${{\rm{\Sigma }}}_{{{\rm{…
Strategies for Determining the Cascade Rate in MHD Turbulence: Isotropy, Anisotropy, and Spacecraft Sampling
Shay, Michael A.; Oughton, Sean; Yang, Yan +6 more
Exact laws for evaluating cascade rates, tracing back to the Kolmogorov "4/5" law, have been extended to many systems of interest including magnetohydrodynamics (MHD), and compressible flows of the magnetofluid and ordinary fluid types. It is understood that implementations may be limited by the quantity of available data and by the lack of turbul…
Clues to the Formation of Liller 1 from Modeling Its Complex Star Formation History
Pallanca, Cristina; Dalessandro, Emanuele; Ferraro, Francesco R. +7 more
Liller 1 and Terzan 5 are two massive systems in the Milky Way bulge hosting populations characterized by significantly different ages (Δt > 7-8 Gyr) and metallicities (Δ[Fe/H] ~ 1 dex). Their origin is still strongly debated in the literature and all formation scenarios proposed so far require some level of fine-tuning. The detailed star forma…
Low Star Formation Activity and Low Gas Content of Quiescent Galaxies at z = 3.5-4.0 Constrained with ALMA
Papovich, Casey; Kacprzak, Glenn G.; Glazebrook, Karl +10 more
The discovery in deep near-infrared surveys of a population of massive quiescent galaxies at z > 3 has given rise to the question of how they came to be quenched so early in the history of the universe. Measuring their molecular gas properties can distinguish between physical processes where they stop forming stars due to a lack of fuel versus …
The Active Chromospheres of Lithium-rich Red Giant Stars
Dupree, Andrea K.; Mahadevan, Suvrath; Terrien, Ryan +17 more
We have gathered near-infrared zyJ-band high-resolution spectra of nearly 300 field red giant stars with known lithium abundances in order to survey their He I λ10830 absorption strengths. This transition is an indicator of chromospheric activity and/or mass loss in red giants. The majority of stars in our sample reside in the red clump or red hor…
Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. II. Period-Fourier-Metallicity Relations for First Overtone RR Lyrae
Dall'Ora, Massimo; Bono, Giuseppe; Fiorentino, Giuliana +11 more
We present new period-ϕ 31-[Fe/H] relations for first-overtone RRL stars (RRc), calibrated over a broad range of metallicities (-2.5 ≲ [Fe/H] ≲ 0.0) using the largest currently available set of Galactic halo field RRL with homogeneous spectroscopic metallicities. Our relations are defined in the optical (ASAS-SN V band) and, inaugurally…
Massive Compact Dust Disk with a Gap around CW Tau Revealed by ALMA Multiband Observations
Kataoka, Akimasa; Tsukagoshi, Takashi; Ueda, Takahiro
Compact protoplanetary disks with a radius of ≲50 au are common around young low-mass stars. We report high-resolution ALMA dust continuum observations toward a compact disk around CW Tau at Bands 4 (λ = 2.2 mm), 6 (1.3 mm), 7 (0.89 mm), and 8 (0.75 mm). The spectral energy distribution shows the spectral slope of 2.0 ± 0.24 between 0.75 and 1.3 m…
A 30 kpc Spatially Extended Clumpy and Asymmetric Galactic Outflow at z 1.7
Chisholm, John; Tejos, Nicolas; Rigby, Jane R. +10 more
We image the spatial extent of a cool galactic outflow with fine-structure Fe II* emission and resonant Mg II emission in a gravitationally lensed star-forming galaxy at z = 1.70347. The Fe II* and Mg II (continuum-subtracted) emissions span out to radial distances of ~14.33 and 26.5 kpc, respectively, with maximum spatial extents of ~21 kpc for F…
Discovery of One Neutron Star Candidate from Radial-velocity Monitoring
Liu, Jifeng; Zhang, Haotong; Wang, Song +8 more
We report the discovery of one possible neutron star binary (P orb = 0.8666 days) by using LAMOST low-resolution spectroscopic data. The visible companion is a late A-type dwarf (T eff = 7900 ± 200 K; logg = 4.3 ± 0.2; M = 1.7 ± 0.1 M ⊙; R = 1.7 ± 0.2 R ⊙) at a distance of 1.11 ± 0.03 kpc. No double-line…
Thermal and Nonthermal Emission in the Optical-UV Spectrum of PSR B0950+08
Pavlov, George G.; Kargaltsev, Oleg; Abramkin, Vadim +1 more
Based on recent Hubble Space Telescope (HST) observations in the far-UV and ground-based observations in optical bands, Pavlov and colleagues have revealed a thermal component in the spectrum of the old pulsar B0950+08 (spin-down age 17.5 Myr) and estimated a neutron star (NS) surface temperature of (1-3) × 105 K. Our new HST observatio…