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Very Large Telescope Spectroscopy of Ultra-faint Dwarf Galaxies. I. Boötes I, Leo IV, and Leo V
Li, Ting S.; Ji, Alexander P.; Pace, Andrew B. +3 more
We perform consistent reductions and measurements for three ultra-faint dwarf galaxies (UFDs): Boötes I, Leo IV, and Leo V. Using the public archival data from the GIRAFFE spectrograph on the Very Large Telescope (VLT), we locate new members and provide refined measurements of physical parameters for these dwarf galaxies. We identify nine new Leo …
Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves. I. Period-Fourier-Metallicity Relations for Fundamental-mode RR Lyrae
Dall'Ora, Massimo; Bono, Giuseppe; Fiorentino, Giuliana +12 more
We present newly calibrated period-φ31-[Fe/H] relations for fundamental-mode RR Lyrae stars in the optical and, for the first time, mid-infrared. This work's calibration data set provides the largest and most comprehensive span of parameter space to date, with homogeneous metallicities from -3 ≲ [Fe/H] ≲ 0.4 and accurate Fourier paramet…
SOFIA FEEDBACK Survey: Exploring the Dynamics of the Stellar Wind-Driven Shell of RCW 49
Schneider, N.; Stutzki, J.; Tielens, A. G. G. M. +13 more
We unveil the stellar wind-driven shell of the luminous massive star-forming region of RCW 49 using SOFIA FEEDBACK observations of the [C II] 158 µm line. The complementary data set of the 12CO and 13CO J = 3 → 2 transitions is observed by the APEX telescope and probes the dense gas toward RCW 49. Using the spatial and …
Multiphase Powerful Outflows Detected in High-z Quasars
Cappi, M.; Vignali, C.; Dadina, M. +7 more
We present results from a comprehensive study of ultrafast outflows (UFOs) detected in a sample of 14 quasars, 12 of which are gravitationally lensed, in a redshift range of 1.41-3.91, near the peak of the active galactic nucleus (AGN) and star formation activity. New XMM-Newton observations are presented for six of them, which were selected to be…
Revealing Gravitational Collapse in the Serpens G3-G6 Molecular Cloud Using Velocity Gradients
Stanimirović, Snežana; Lazarian, A.; Hu, Yue
The relative role of turbulence, magnetic fields, and self-gravity in star formation is a subject of intensive debate. We present IRAM 30 m telescope observations of the 13CO (1-0) emission in the Serpens G3-G6 molecular cloud and apply to the data a set of statistical methods. These include the probability density functions of column d…
Limits on Millimeter Continuum Emission from Circumplanetary Material in the DSHARP Disks
Wilner, David J.; Andrews, Sean M.; Huang, Jane +10 more
We present a detailed analysis for a subset of the high-resolution (~35 mas, or 5 au) ALMA observations from the Disk Substructures at High Angular Resolution Project (DSHARP) to search for faint 1.3 mm continuum emission associated with dusty circumplanetary material located within the narrow annuli of depleted emission (gaps) in circumstellar di…
SPLUS J210428.01-004934.2: An Ultra Metal-poor Star Identified from Narrowband Photometry
Lee, Young Sun; Placco, Vinicius M.; Roederer, Ian U. +6 more
We report on the discovery of SPLUS J210428.01-004934.2, an ultra metal-poor (UMP) star first identified from the narrowband photometry of the Southern Photometric Local Universe Survey (S-PLUS) Data Release 1, in the SDSS Stripe 82 region. Follow-up medium- and high-resolution spectroscopy (with Gemini South and Magellan-Clay, respectively) confi…
Stellar Rotation of T Tauri Stars in the Orion Star-forming Complex
Stassun, Keivan G.; Kounkel, Marina; Briceño, Cesar +14 more
We present a large-scale study of stellar rotation for T Tauri stars in the Orion star-forming complex. We use the projected rotational velocity ( $v\sin (i)$ vsin(i) ) estimations reported by the APOGEE-2 collaboration as well as individual masses and ages derived from the position of the stars in the HR diagram, considering Gaia-EDR3 parallaxes …
Discovery of a Fast Iron Low-ionization Outflow in the Early Evolution of the Nearby Tidal Disruption Event AT 2019qiz
Cenko, S. B.; Veilleux, S.; Filippenko, Alexei V. +16 more
We report the results of ultraviolet (UV) and optical photometric and spectroscopic analysis of the tidal disruption event (TDE) AT 2019qiz. Our follow-up observations started <10 days after the source began to brighten in the optical and lasted for a period of six months. Our late-time host-dominated spectrum indicates that the host galaxy lik…
Magellanic Mayhem: Metallicities and Motions
Evans, N. W.; Belokurov, V.; Grady, J.
We assemble a catalog of Magellanic Cloud red giants from Data Release 2 of the Gaia mission and, utilizing machine-learning methods, obtain photometric metallicity estimates for them. In doing so, we are able to chemically map the entirety of the Magellanic System at once. Our maps reveal a plethora of substructure within our red giant sample, wi…