Search Publications
Catalog of High Protostellar Surface Density Regions in Nearby Embedded Clusters
Li, Juan; Myers, Philip C.; Kirk, Helen +3 more
We analyze high-quality stellar catalogs for 24 young and nearby (within 1 kpc) embedded clusters and present a catalog of 32 groups which have a high concentration of protostars. The median effective radius of these groups is 0.17 pc. The median protostellar and pre-main-sequence star surface densities are 46 M ⊙ pc-2 and 11…
T CrB: Radio Observations during the 2016-2017 “Super-active” State
Chomiuk, Laura; Sokoloski, Jennifer L.; Mukai, Koji +6 more
We obtained radio observations of the symbiotic binary and known recurrent nova T Coronae Borealis following a period of increased activity in the optical and X-ray bands. A comparison of our observations with those made prior to 2015 indicates that the system is in a state of higher emission in the radio as well. The spectral energy distributions…
A high-resolution, dust-selected molecular cloud catalogue of M33, the Triangulum Galaxy
Smith, Matthew W. L.; Williams, Thomas G.; Gear, Walter K.
We present a catalogue of Giant Molecular Clouds (GMCs) in M33, extracted from cold dust continuum emission. Our GMCs are identified by computing dendrograms. We measure the spatial distribution of these clouds, and characterize their dust properties. Combining these measured properties with CO(J = 2-1) and 21 cm H I data, we calculate the gas-to-…
The origin of R CrA variability. A complex triple system hosting a disk
Messina, S.; D'Orazi, V.; Desidera, S. +5 more
Context. R CrA is the brightest member of the Coronet star-forming region and is the closest Herbig AeBe star with a spectrum dominated by emission lines. Its luminosity has been monitored since the end of the nineteenth century, but the origin of its variability, which shows a stable period of 65.767 ± 0.007 days, is still unknown.
Aims: We …
HSC-XD 52: An X-Ray Detected AGN in a Low-mass Galaxy at z ∼ 0.56
Johnson, Sean D.; Sawicki, Marcin; Gwyn, Stephen +8 more
The properties of low-mass galaxies hosting central black holes provide clues about the formation and evolution of the progenitors of supermassive black holes. In this Letter, we present HSC-XD 52, a spectroscopically confirmed low-mass active galactic nucleus (AGN) at an intermediate redshift of z ∼ 0.56. We detect this object as a very luminous …
Three-Dimensional Optimal Spectral Extraction (TDOSE) from integral field spectroscopy
Inami, H.; Schmidt, K. B.; Krajnović, D. +8 more
The amount of integral field spectrograph (IFS) data has grown considerably over the last few decades. The demand for tools to analyze such data is therefore bigger now than ever. We present a flexible Python tool for Three-Dimensional Optimal Spectral Extraction (TDOSE) from IFS data cubes. TDOSE works on any three-dimensional data cube and bases…
SPLOT: a snapshot survey for polarized light in optical transients
Covino, S.; Hodgkin, S. T.; Wyrzykowski, Ł. +7 more
We present SPLOT, a small-scale pilot survey to test the potential of snapshot (single epoch) linear imaging polarimetry as a supplementary tool to traditional transient follow-up. Transients exist in a vast volume of observational parameter space and polarimetry has the potential to highlight sources of scientific interest and add value to near r…
Orbits of 14 binaries based on 2018 SOAR speckle observations
Docobo, José A.; Campo, Pedro P.; Horch, Elliott P. +4 more
New data obtained during the 2018 March-April speckle run at the 4.1 m Southern Astrophysical Research (SOAR) telescope located at Cerro Pachón (Chile) allowed us to recalculate the orbits of the following visual binaries: WDS 06478+0020 (STT 157), WDS 07003-2207 (FIN 334Aa,Ab), WDS 07013-0906 (A 671), WDS 10174-5354 (CVN 16Aa,Ab), WDS 12155-3106 …
Spatial and velocity offsets of Galactic masers from the centres of spiral arms
Vallée, Jacques P.
Some theories about the spiral arms of galaxies predict an offset between different tracers of star formation. Our goal in this paper is to find such an offset between the observed locations of radio masers and the locations of the arms, using a recent four-arm model fitted to the CO 1-0 gas. Our method is to compare a recent global four-arm spira…
Precise radial velocities of giant stars. XIII. A second Jupiter orbiting in 4:3 resonance in the 7 CMa system
Quirrenbach, A.; Grundahl, F.; Albrecht, S. +8 more
We report the discovery of a second planet orbiting the K giant star 7 CMa based on 166 high-precision radial velocities obtained with Lick, HARPS, UCLES, and SONG. The periodogram analysis reveals two periodic signals of approximately 745 and 980 d, associated with planetary companions. A double-Keplerian orbital fit of the data reveals two Jupit…