Search Publications
On the 1/f Spectrum in the Solar Wind and Its Connection with Magnetic Compressibility
Matteini, L.; Horbury, T. S.; Chen, C. H. K. +1 more
We discuss properties of Alfvénic fluctuations with large amplitude in plasmas characterized by low magnetic field compression. We note that in such systems power laws cannot develop with arbitrarily steep slopes at large scales, i.e., when | δ {\boldsymbol{B}}| becomes of the order of the background field | {\boldsymbol{B}}| . In such systems the…
A Near-infrared Period-Luminosity Relation for Miras in NGC 4258, an Anchor for a New Distance Ladder
Casertano, Stefano; Jones, David O.; Riess, Adam G. +8 more
We present year-long, near-infrared (NIR) Hubble Space Telescope (HST) WFC3 observations of Mira variables in the water megamaser host galaxy NGC 4258. Miras are asymptotic giant branch variables that can be divided into oxygen- (O-) and carbon- (C-) rich subclasses. Oxygen-rich Miras follow a tight (scatter ∼0.14 mag) period-luminosity relation (…
SHINING, A Survey of Far-infrared Lines in Nearby Galaxies. I. Survey Description, Observational Trends, and Line Diagnostics
Lutz, D.; Genzel, R.; Maiolino, R. +12 more
We use the Herschel/PACS spectrometer to study the global and spatially resolved far-infrared (FIR) fine-structure line emission in a sample of 52 galaxies that constitute the SHINING survey. These galaxies include star-forming, active-galactic nuclei (AGNs), and luminous infrared galaxies (LIRGs). We find an increasing number of galaxies (and kil…
Revisiting the Extended Schmidt Law: The Important Role of Existing Stars in Regulating Star Formation
Fang, Min; Qiu, Keping; Chen, Yanmei +13 more
We revisit the proposed extended Schmidt law, which posits that the star formation efficiency in galaxies depends on the stellar mass surface density, by investigating spatially resolved star formation rates (SFRs), gas masses, and stellar masses of star formation regions in a vast range of galactic environments, from the outer disks of dwarf gala…
The Disk Substructures at High Angular Resolution Program (DSHARP). VIII. The Rich Ringed Substructures in the AS 209 Disk
Wilner, David J.; Andrews, Sean M.; Guzmán, Viviana V. +12 more
We present a detailed analysis of the high angular resolution (0.″037, corresponding to 5 au) observations of the 1.25 mm continuum and 12CO 2 - 1 emission from the disk around the T Tauri star AS 209. AS 209 hosts one of the most unusual disks from the Disk Substructures at High Angular Resolution Project sample, the first high angular…
Molecular Gas Reservoirs in Cluster Galaxies at z = 1.46
Tamura, Yoichi; Kohno, Kotaro; Suzuki, Tomoko L. +7 more
We present molecular gas reservoirs of 18 galaxies associated with the XMMXCS J2215.9-1738 cluster at z = 1.46. From Band 7 and Band 3 data of the Atacama Large Millimeter/submillimeter Array, we detect dust continuum emission at 870 µm and the CO J = 2-1 emission line from 8 and 17 member galaxies, respectively, within a clustercentric radi…
RELICS: A Candidate z ∼ 10 Galaxy Strongly Lensed into a Spatially Resolved Arc
Ouchi, Masami; Frye, Brenda L.; Strait, Victoria +27 more
The most distant galaxies known are at z ∼ 10-11, observed 400-500 Myr after the Big Bang. The few z ∼ 10-11 candidates discovered to date have been exceptionally small, barely resolved, if at all, by the Hubble Space Telescope. Here we present the discovery of SPT0615-JD1, a fortuitous z ∼ 10 (z phot = {9.9}-0.6+0.8
On the Detection of Coronal Dimmings and the Extraction of Their Characteristic Properties
Temmer, M.; Veronig, A. M.; Vanninathan, K. +2 more
Coronal dimmings are distinct phenomena associated with coronal mass ejections (CMEs). The study of coronal dimmings and the extraction of their characteristic parameters help us to obtain additional information regarding CMEs, especially on the initiation and early evolution of Earth-directed CMEs. We present a new approach to detect coronal dimm…
Variable Outer Disk Shadowing around the Dipper Star RXJ1604.3-2130
Ginski, C.; Dominik, C.; Bouvier, J. +6 more
Low brightness dips have recently been observed in images of protoplanetary disks, and they are believed to be shadows by the inner disk. We present VLT/SPHERE polarimetric differential imaging of the transition disk around the dipper star RX J1604.3-2130. We gathered 11 epochs that cover a large temporal baseline, to search for variability over t…
Implications of the Large O VI Columns around Low-redshift L ∗ Galaxies
Werk, Jessica K.; McQuinn, Matthew
Observations reveal massive amounts of O VI around star-forming L * galaxies, with covering fractions of near unity extending to the host halo’s virial radius. This O VI absorption is typically kinematically centered upon photoionized gas, with line widths that are suprathermal and kinematically offset from the galaxy. We discuss variou…