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Hubble Ultraviolet Spectroscopy of Jupiter Trojans
Ehlmann, Bethany L.; Brown, Michael E.; Mahjoub, Ahmed +2 more
We present the first ultraviolet spectra of Jupiter Trojans. These observations were carried out using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope and cover the wavelength range 200-550 nm at low resolution. The targets include objects from both of the Trojan color subpopulations (less-red and red). We do not observe any…
Variability of young stellar objects in the star-forming region Pelican Nebula
Chen, W. P.; Herczeg, G. J.; Bhardwaj, A. +2 more
Context. Pre-main-sequence variability characteristics can be used to probe the physical processes leading to the formation and initial evolution of both stars and planets.
Aims: The photometric variability of pre-main-sequence stars is studied at optical wavelengths to explore star-disk interactions, accretion, spots, and other physical mech…
Antlia 2’s Role in Driving the Ripples in the Outer Gas Disk of the Galaxy
Hernquist, Lars; Price-Whelan, Adrian M.; Chang, Philip +3 more
We employ the earlier published proper motions of the newly discovered Antlia 2 dwarf galaxy derived from Gaia data to calculate its orbital distribution in the cosmologically recent past. Using these observationally motivated orbits, we calculate the effect of the Antlia 2 dwarf galaxy on the outer H I disk of the Milky Way, using both test parti…
Hyperluminous starburst gives up its secrets
Ivison, R. J.; Page, M. J.; Mainieri, V. +4 more
HATLAS J084933.4 + 021443 was identified as a dusty starburst via its rest-frame far-infrared (far-IR) emission. Multifrequency imaging and spectroscopy revealed a cluster of four dusty galaxies at z = 2.41, covering 80 kpc. Here, we use Atacama Large Millimetre Array to confirm a more distant, fifth protocluster member, and present X-ray and rest…
Learning mid-IR emission spectra of polycyclic aromatic hydrocarbon populations from observations
Joblin, C.; Berné, O.; Foschino, S.
Context. The James Webb Space Telescope (JWST) will deliver an unprecedented quantity of high-quality spectral data over the 0.6-28 µm range. It will combine sensitivity, spectral resolution, and spatial resolution. Specific tools are required to provide efficient scientific analysis of such large data sets.
Aims: Our aim is to illustra…
SPIRE Spectroscopy of Early-type Galaxies
Young, Lisa M.; Lapham, Ryen Carl
We present Spectral and Photometric Imaging Receiver (SPIRE) spectroscopy for nine early-type galaxies (ETGs) representing the most CO-rich and far-infrared (FIR) bright galaxies of the volume-limited Atlas3D sample. Our data include detections of mid- to high-J CO transitions (J = 4-3 to J = 13-12) and the [C I] (1-0) and (2-1) emission lines. CO…
The z = 0.54 LoBAL Quasar SDSS J085053.12+445122.5. II. The Nature of Partial Covering in the Broad-absorption-line Outflow
Gallagher, Sarah C.; Terndrup, Donald M.; Leighly, Karen M. +5 more
It has been known for 20 years that the absorbing gas in broad-absorption-line quasars does not completely cover the continuum emission region, and that partial covering must be accounted for to accurately measure the column density of the outflowing gas. However, the nature of partial covering itself is not understood. Extrapolation of the SimBAL…
HADES RV Programme with HARPS-N at TNG. X. The non-saturated regime of the stellar activity-rotation relationship for M dwarfs
Rebolo, R.; Ribas, I.; Scandariato, G. +22 more
Aims: We extend the relationship between X-ray luminosity (Lx) and rotation period (Prot) found for main-sequence FGK stars, and test whether it also holds for early M dwarfs, especially in the non-saturated regime (Lx ∝ Prot-2) which corresponds to slow rotators.
Methods: We use the…
The Nearby, Young, χ 1 Fornacis Cluster: Membership, Age, and an Extraordinary Ensemble of Dusty Debris Disks
Zuckerman, B.; Kastner, Joel; Klein, Beth
Only four star clusters are known within ∼100 pc of Earth. Of these, the χ 1 For cluster has barely been studied. We use the Gaia DR2 catalog and other published data to establish the cluster membership, structure, and age. The age of and distance to the cluster are ∼40 Myr and 104 pc, respectively. A remarkable, unprecedented aspect of…
A Very Large Array Survey of Luminous Extranuclear Star-forming Regions in Luminous Infrared Galaxies in GOALS
Surace, J. A.; Murphy, E. J.; Momjian, E. +13 more
We present the first results of a high-resolution Karl G. Jansky Very Large Array imaging survey of luminous and ultra-luminous infrared galaxies (U/LIRGs) in the Great Observatories All-sky LIRG Survey. From the full sample of 68 galaxies, we have selected 25 luminous infrared galaxies (LIRGs) that show resolved extended emission at sufficient se…