Search Publications
I Zw 1 and H0557-385: the dusty tori of two high Eddington AGNs observed in the MATISSE LM bands
Kishimoto, Makoto; Drewes, Farin; Leftley, James H. +2 more
The torus in active galactic nuclei (AGNs) is a complex dynamical structure of gas and dust. It is thought to be composed of an equatorial dusty disc and a polar dusty wind launched by radiation pressure. However, this picture is based on studies of moderately accreting AGN. Models suggest that the disc/wind structure will change with specific acc…
ALMA observations of CO isotopologues towards six obscured post-asymptotic giant branch stars
Olofsson, H.; Sahai, R.; Sánchez Contreras, C. +13 more
Context. Low- and intermediate-mass stars evolve through the asymptotic giant branch (AGB) when an efficient mass-loss process removes a significant fraction of their initial mass. For most sources, this mass-loss process relies on the interplay between convection, stellar pulsations, and dust formation. However, predicting the mass-loss history o…
The lithium-rich giant stars puzzle: New observational trends for a general-mass-loss scenario
de la Reza, R.
The existence of one percent of lithium-rich giant stars among normal, lithium-poor giant stars continues to be poorly explained. By merging two catalogues – one containing 10,535 lithium-rich giant stars with lithium abundances ranging from 1.5 to 4.9 dex, and the other detecting infrared sources – we have found 421 clump giant stars and 196 firs…
Implication of Galaxy-scale Negative Feedback by One of the Most Powerful Multiphase Outflows in a Hyperluminous Infrared Galaxy at Intermediate Redshift
Imanishi, Masatoshi; Iono, Daisuke; Saito, Toshiki +12 more
Powerful galactic outflows driven by active galactic nuclei (AGNs) are commonly considered as one of the main mechanisms to regulate star formation in massive galaxies. Ultra- and hyperluminous IR galaxies (U/HyLIRGs) are thought to represent a transition phase of galaxies from a rapidly growing period to a quiescent status as gas is swept out by …
Complex investigations of an active star formation region in the southern part of Mon R2
Moiseev, A. V.; Bally, J.; Movsessian, T. A. +1 more
We continue to present the results of a Byurakan Narrow Band Imaging Survey (BNBIS). In this work, we present the results of the search and further detailed investigation of the objects, found in the course of the BNBIS survey in the southern part of the Mon R2 (Monoceros R2) association. For the search of Herbig-Haro (HH) objects, the narrow-band…
Near-ultraviolet absorption distribution of primitive asteroids from photometric surveys: II. Collisional families
Tatsumi, Eri; Vilas, Faith; de León, Julia +5 more
Context. Primitive asteroids consisting of mainly phyllosilicates and opaque minerals have great variation at near-ultraviolet (NUV) wavelengths (0.35–0.5 µm). The absorption in NUV could be indicative of phyllosilicates that reflect their formation environments such as the distribution of water, temperature, and pressure. The asteroid colli…
Physical characteristics of Jupiter's Trojan (1437) Diomedes from a tri-chord stellar occultation in 2020 and dimensionless three-dimensional model
Sicardy, B.; Gomes-Júnior, A. R.; Ortiz, J. L. +15 more
Jupiter Trojans preserve primitive formation characteristics owing to their collisionless, stable orbits. Determination of their shapes and size-frequency distribution helps constrain the collisional evolution of their parent population, which also originated the Kuiper Belt. We started a programme to find precise sizes/shapes for Trojans, combini…
Prediction of Star Formation Rates Using an Artificial Neural Network
Woo, Jong-Hak; Ayubinia, Ashraf; Kim, Changseok +2 more
In this study we develop an artificial neural network to estimate the infrared (IR) luminosity and star formation rates (SFR) of galaxies. Our network is trained using "true" IR luminosity values derived from modeling the IR spectral energy distributions of FIR-detected galaxies. We explore five different sets of input features, each incorporating…
Rotation period estimates for 14 asteroids with the Earth MOID less than 1.1 AU
Eglitis, Ilgmars; Svincicka, Darja
In the present study, the Lomb–Scargle Scargle (L–S) method was employed for the analysis of brightness measurements from multiple observatories as published in the Minor Planet Center (MPC) circulars, as well as brightness measurements from the Baldone Observatory, to determine the periods of asteroids. The periods of fifteen asteroids were deter…
DECaPS and SMA Discovery of a Highly Inclined Class I Young Stellar Object with an Outflow: IRAS 08235–4316
Wilner, David J.; Rao, Ramprasad; Edenhofer, Gordian +4 more
We present images of IRAS 08235–4316 with the Dark Energy Camera Plane Survey (DECaPS; spanning 0.398–1.034 µm, at ∼1″ resolution) and the Submillimeter Array (SMA; at 1.38 mm (217 GHz) and ∼1