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…
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…
Cosmic star-formation history and black hole accretion history inferred from the JWST mid-infrared source counts
Kilerci, Ece; Hashimoto, Tetsuya; Goto, Tomotsugu +7 more
With the advent of the JWST, extragalactic source count studies were conducted down to sub-µJy in the mid-infrared (MIR), which is several tens of times fainter than what the previous-generation infrared (IR) telescopes achieved in the MIR. In this work, we aim to interpret the JWST source counts and constrain cosmic star-formation history (…
The first measurements of carbon isotopic ratios in post-RGB stars: SZ Mon and DF Cyg
Ventura, Paolo; Masseron, Thomas; Van Winckel, Hans +4 more
Dusty post-red giant branch (post-RGB) stars are low- and intermediate-mass stars where the RGB evolution was prematurely terminated by a poorly understood binary interaction. These binary stars are considered to be low-luminosity analogues of post-asymptotic giant branch (post-AGB) binary stars. In this study, we investigated the chemical composi…
Introducing the Condor array telescope II - deep imaging observations of the edge-on spiral galaxy NGC 5907 and the NGC 5866 Group: yet another view of the iconic stellar stream
Walter, Frederick M.; Shara, Michael M.; Lanzetta, Kenneth M. +6 more
We used the Condor array telescope to obtain deep imaging observations through the luminance filter of the entirety of the NGC 5866 Group, including a very extended region surrounding the galaxy NGC 5907 and its stellar stream. We find that the stellar stream consists of a single curved structure that stretches 220 kpc from a brighter eastern stre…
Polycyclic aromatic hydrocarbon luminous galaxies in JWST CEERS data
Kilerci, Ece; Hashimoto, Tetsuya; Goto, Tomotsugu +9 more
It has been an unanswered question how many dusty galaxies have been undetected from the state-of-the-art observational surveys. JWST enables us to detect faint infrared (IR) galaxies that have prominent polycyclic aromatic hydrocarbon (PAH) features in the mid-IR wavelengths. PAH is a valuable tracer of star formation and dust properties in the m…
Abundant sub-micron grains revealed in newly discovered extreme debris discs
Henning, Thomas; Moór, Attila; Pawellek, Nicole +7 more
Extreme debris discs (EDDs) are bright and warm circumstellar dusty structures around main sequence stars. They may represent the outcome of giant collisions occuring in the terrestrial region between large planetesimals or planetary bodies, and thus provide a rare opportunity to peer into the aftermaths of these events. Here, we report on results…
A statistical approach to polarimetric and photometric investigation of the intermediate-age open cluster NGC 1912
Biswas, Samrat; Medhi, Biman J.; Deb, Sushmita +3 more
This paper presents a comprehensive multiwavelength investigation of the intermediate-age open cluster NGC 1912. We identified 401 member stars for NGC 1912 using K-nearest neighbour and Gaussian Mixture Model machine learning techniques. The fundamental parameters determined for the cluster are metallicity (z) = 0.0141 $\pm$ 0.0006, log(age) = 8.…
Search for protostellar jets with UWISH2 in the molecular cloud complexes Vulpecula and IRDC G53.2
Tej, Anandmayee; Froebrich, Dirk; Samal, Manash +1 more
Jets and outflows are the early signposts of stellar birth. Using the UKIRT Wide Field Infrared Survey for H2 (UWISH2) at 2.12 µm, 127 outflows are identified in molecular cloud complexes Vulpecula OB1 and IRDC G53.2 covering 12 square degrees of the Galactic plane. Using multiwavelength data sets, from 1.2 to 70 µm, 79 youn…
A GMRT 610 MHz radio survey of the North Ecliptic Pole (NEP, ADF-N) / Euclid Deep Field North
Burgarella, D.; Shimwell, T. W.; Serjeant, S. +17 more
This paper presents a 610 MHz radio survey covering 1.94 deg