Search Publications
Missions
Journals
Publication Years
Dual-band Observations of the Asymmetric Ring around CIDA 9A: Dead or Alive?
Herczeg, Gregory J.; Johnstone, Doug; Long, Feng +9 more
While the most exciting explanation of the observed dust asymmetries in protoplanetary disks is the presence of protoplanets, other mechanisms can also form the dust features. This paper presents dual-wavelength Atacama Large Millimeter/submillimeter Array observations of a large asymmetric dusty ring around the M-type star CIDA 9A. We detect a du…
XMM-Newton - NuSTAR monitoring campaign of the Seyfert 1 galaxy IC 4329A
Paltani, S.; Tombesi, F.; Privon, G. C. +13 more
We present the results of a joint XMM-Newton and NuSTAR campaign on the active galactic nucleus (AGN) IC 4329A, consisting of 9 × 20 ks XMM-Newton observations, and 5 × 20 ks NuSTAR observations within nine days, performed in August 2021. Within each observation, the AGN is not very variable, and the fractional variability never exceeds 5%. Flux v…
Eight new 2+2 doubly eclipsing quadruple systems detected
Merc, J.; Kučáková, H.; Zasche, P. +2 more
We studied eight new doubly eclipsing stellar systems. We found that they are all rare examples of quadruple systems of 2 + 2 architecture, where both inner pairs are eclipsing binaries. Until now, such a configuration had only been proven for dozens of systems on the whole sky. We enlarged this rare group of systems with four stars in the Small M…
The Smallest Scale of Hierarchy Survey (SSH): III. Dwarf-dwarf satellite merging phenomena in the low-mass regime
de Jong, Roelof S.; Cannon, John M.; Cignoni, Michele +13 more
We present new deep, wide-field imaging data from the Large Binocular Telescope (LBT) in g and r bands from the Smallest Scale of Hierarchy Survey (SSH) that reveal previously undetected tidal features and stellar streams in the outskirts of six dwarf irregular galaxies (NGC 5238, UGC 6456, UGC 6541, UGC 7605, UGC 8638, and UGC 8760) with stellar …
Calibrating and Standardizing the Tip of the Red Giant Branch in the Small Magellanic Cloud Using Small-amplitude Red Giants
Anderson, Richard I.; Koblischke, Nolan W.
We investigate the absolute calibration of the tip of the red giant branch (TRGB) in the Small Magellanic Cloud (SMC) using small amplitude red giant stars (SARGs) classified by the Optical Gravitational Lensing Experiment (OGLE). We show that all stars near the SMC's TRGB are SARGs. Distinguishing older and younger RGs near the tip according to t…
4XMM J182531.5−144036: A new persistent Be/X-ray binary found within the XMM-Newton serendipitous survey
Farrell, S. A.; Gosling, A. J.; Clark, J. S. +2 more
We aim to investigate the nature of time-variable X-ray sources detected in the XMM-Newton serendipitous survey. The X-ray light curves of objects in the XMM-Newton serendipitous survey were searched for variability, and coincident serendipitous sources observed by Chandra were also investigated. Subsequent infrared spectroscopy of the counterpart…
Dust mass in protoplanetary disks with porous dust opacities
Fang, Min; Flock, Mario; Henning, Thomas +8 more
Atacama Large Millimeter/submillimeter Array surveys have suggested that protoplanetary disks are not massive enough to form the known exoplanet population, based on the assumption that the millimeter continuum emission is optically thin. In this work, we investigate how the mass determination is influenced when the porosity of dust grains is cons…
Black Hole Scaling Relations in the Dwarf-galaxy Regime with Gaia-Sausage/Enceladus and ωCentauri
Limberg, Guilherme
The discovery of fast moving stars in Milky Way's most massive globular cluster, ωCentauri (ωCen), has provided strong evidence for an intermediate-mass black hole (IMBH). However, ωCen is known to be the stripped nuclear star cluster (NSC) of an ancient, now-destroyed, dwarf galaxy. The best candidate to be the original host progenitor of ωCen is…
Multiwavelength Observations of Quasiperiodic Pulsations in the Impulsive Phase of an Eruptive Flare with the Hard X-Ray Imager On Board ASO-S and Other Instruments
Chen, Wei; Warmuth, Alexander; Su, Yang +7 more
We investigated the quasiperiodic pulsations (QPPs) of the X1.2 solar flare (SOL2023-01-06T00:57) based on multi-instrument observations, especially the Hard X-ray Imager (HXI) on board the Advanced Space-based Solar Observatory (ASO-S). The quasiperiod of ≈27 s was identified in hard X-rays (HXR) and microwaves using the Markov Chain Monte Carlo …
Resolved UV and Optical Color Gradients Reveal Environmental Influence on Galaxy Evolution at Redshift z ∼ 1.6
Cooper, M. C.; van Kampen, E.; Demarco, R. +13 more
The changes in colors across a galaxy are intimately connected to the galaxy's formation, growth, quenching history, and dust content. A particularly important epoch in the growth of galaxies is near z ∼ 2, often referred to as "cosmic noon," where galaxies on average reach the peak of their star formation. We study a population of 125 cluster gal…