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The first spectroscopic dust reverberation programme on active galactic nuclei: the torus in NGC 5548
Starkey, D. A.; Pott, J. -U.; Peterson, B. M. +16 more
We have recently initiated the first spectroscopic dust reverberation programme on active galactic nuclei in the near-infrared. Spectroscopy enables measurement of dust properties, such as flux, temperature, and covering factor, with higher precision than photometry. In particular, it enables measurement of both luminosity-based dust radii and dus…
New Hot Subdwarf Stars Identified in Gaia DR2 with LAMOST DR5 Spectra. II.
Zhao, Gang; Németh, Péter; Zhao, Jingkun +1 more
Three hundred and eighty eight hot subdwarf stars have been identified by using the Hertzsprung-Russell (HR) diagram built from the second data release of the Gaia mission. By analyzing their observed Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) spectra, we characterized 186 sdB, 73 He-sdOB, 65 sdOB, 45 sdO, 12 He-sdO, and 7 …
Star-density Profiles of Six Old Star Clusters in the Large Magellanic Cloud
Cadelano, Mario; Pallanca, Cristina; Dalessandro, Emanuele +6 more
We used resolved star counts from Hubble Space Telescope (HST) images to determine the center of gravity and the projected density profiles of six old globular clusters (GCs) in the Large Magellanic Cloud (LMC), namely NGC 1466, NGC 1841, NGC 1898, NGC 2210, NGC 2257, and Hodge 11. For each system, the LMC field contribution was properly taken int…
Analysis of Neptune's 2017 bright equatorial storm
de Pater, Imke; Wong, Michael H.; Magnier, Eugene A. +22 more
We report the discovery of a large ( ∼ 8500 km diameter) infrared-bright storm at Neptune's equator in June 2017. We tracked the storm over a period of 7 months with high-cadence infrared snapshot imaging, carried out on 14 nights at the 10 m Keck II telescope and 17 nights at the Shane 120 inch reflector at Lick Observatory. The cloud feature was…
On the different levels of dust attenuation to nebular and stellar light in star-forming galaxies
Yamamura, Issei; Koyama, Yusei; Kodama, Tadayuki +2 more
As a science verification study of the newly released AKARI/FIS Faint Source Catalog ver. 1, this paper discusses the different levels of dust attenuation toward stellar light and nebular emission lines within local star-forming galaxies at 0.02 < z < 0.10. By constructing an updated version of the AKARI-SDSS-GALEX matched galaxy catalog (wi…
Hot UV-bright stars of galactic globular clusters
Lanz, T.; Miller Bertolami, M. M.; Landsman, W. B. +1 more
Context. We have performed a census of the UV-bright population in 78 globular clusters using wide-field UV telescopes. This population includes a variety of phases of post-horizontal branch (HB) evolution, including hot post-asymptotic giant branch (AGB) stars, and post-early AGB stars. There are indications that old stellar systems like globular…
PLCK G165.7+67.0: Analysis of a Massive Lensing Cluster in a Hubble Space Telescope Census of Submillimeter Giant Arcs Selected Using Planck/Herschel
Donahue, Megan; Frye, Brenda L.; Conselice, Christopher J. +19 more
We present Hubble Space Telescope WFC3-IR imaging in the fields of six apparently bright dusty star-forming galaxies (DSFGs) at z = 2-4 identified by their rest-frame far-infrared colors using the Planck and Herschel space facilities. We detect near-infrared counterparts for all six submillimeter sources, allowing us to undertake strong-lensing an…
Surface refreshing of Martian moon Phobos by orbital eccentricity-driven grain motion
Fujimoto, Masaki; Ballouz, Ronald-Louis; Baresi, Nicola +2 more
The surface of the Martian moon Phobos exhibits two distinct geologic units, red and blue, characterized by their spectral slopes. The provenance of these units is uncertain yet crucial to understanding the origin of the Martian moon and its interaction with the space environment. Here we present a combination of dynamical analyses and numerical s…
ALMA observations of PKS 1549-79: a case of feeding and feedback in a young radio quasar
Morganti, Raffaella; Oosterloo, Tom; Tadhunter, Clive +4 more
We present CO(1-0) and CO(3-2) Atacama Large Millimeter/submillimeter Array observations of the molecular gas in PKS 1549-79, as well as mm and very long baseline interferometry 2.3-GHz continuum observations of its radio jet. PKS 1549-79 is one of the closest young, radio-loud quasars caught in an on-going merger in which the active galactic nucl…
How Much Information Does the Sodium Doublet Encode? Retrieval Analysis of Non-LTE Sodium Lines at Low and High Spectral Resolutions
Heng, Kevin; Fisher, Chloe
Motivated by both ground- and space-based detections of the sodium doublet in the transmission spectra of exoplanetary atmospheres, we revisit the theory and interpretation of sodium lines in non-local thermodynamic equilibrium (NLTE), where collisions are not efficient enough to maintain a Boltzmann distribution for the excited and ground states …