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Tracing the Ionization Structure of the Shocked Filaments of NGC 6240
Kewley, Lisa J.; Heckman, Timothy M.; Calzetti, Daniela +14 more
We study the ionization and excitation structure of the interstellar medium in the late-stage gas-rich galaxy merger NGC 6240 using a suite of emission-line maps at ~25 pc resolution from the Hubble Space Telescope, Keck/NIRC2 with Adaptive Optics, and the Atacama Large Millimeter/submillimeter Array (ALMA). NGC 6240 hosts a superwind driven by in…
X-Ray-to-radio Offset Inference from Low-count X-Ray Jets
Georganopoulos, Markos; Meyer, Eileen T.; Reddy, Karthik
Observations of positional offsets between the location of X-ray and radio features in many resolved, extragalactic jets indicates that the emitting regions are not cospatial, an important piece of evidence in the debate over the origin of the X-ray emission on kiloparsec scales. The existing literature is nearly exclusively focused on jets with s…
Morphological and kinematical analysis of the double-barred galaxy NGC 3504 using ALMA CO (2-1) data
Miyamoto, Yusuke; Espada, Daniel; Trejo, Alfonso +1 more
We present results obtained from ALMA CO (2-1) data of the double-barred galaxy NGC 3504. With three times higher angular resolution (~0${_{.}^{\prime\prime}}$8) than previous studies, our observations reveal an inner molecular gas bar, a nuclear ring, and four inner spiral arm-like structures in the central 1-kpc region. Furthermore, the CO emiss…
The dense warm ionized medium in the inner Galaxy
Goldsmith, P. F.; Langer, W. D.; Buchbender, C. +6 more
Context. Ionized interstellar gas is an important component of the interstellar medium and its lifecycle. The recent evidence for a widely distributed highly ionized warm interstellar gas with a density intermediate between the warm ionized medium (WIM) and compact H II regions suggests that there is a major gap in our understanding of the interst…
Membership of stars in open clusters using random forest with gaia data
Hasan, S. N.; Hasan, Priya; Raja, Mudasir +1 more
Membership of stars in open clusters is one of the most crucial parameters in studies of star clusters. Gaia opened a new window in the estimation of membership because of its unprecedented 6-D data. In the present study, we used published membership data of nine open star clusters as a training set to find new members from Gaia DR2 data using a s…
Ubiquitous signs of interactions in early-type galaxies with prolate rotation
Duc, Pierre-Alain; Bílek, Michal; Ebrová, Ivana +2 more
Context. A small fraction of early-type galaxies (ETGs) show prolate rotation; that is, they rotate around their long photometric axis. In simulations, certain configurations of galaxy mergers are known to produce this type of rotation.
Aims: We investigate the association of prolate rotation and signs of galaxy interactions among the observe…
Dipper-like variability of the Gaia alerted young star V555 Ori
Pál, András; Moór, Attila; Ábrahám, Péter +26 more
V555 Ori is a T Tauri star, whose 1.5 mag brightening was published as a Gaia science alert in 2017. We carried out optical and near-infrared (NIR) photometric, and optical spectroscopic observations to understand the light variations. The light curves show that V555 Ori was faint before 2017, entered a high state for about a year, and returned to…
Surveying the Giant H II Regions of the Milky Way with SOFIA. III. W49A
Lim, Wanggi; Karnath, Nicole; De Buizer, James M. +2 more
We present our third set of results from our mid-infrared imaging survey of Milky Way Giant H II regions with our detailed analysis of W49A, one of the most distant, yet most luminous, GH II regions in the Galaxy. We used the FORCAST instrument on the Stratospheric Observatory For Infrared Astronomy (SOFIA) to obtain 20 and 37 µm images of t…
The Cosmic Large-Scale Structure in X-rays (CLASSIX) Cluster Survey. IV. Superclusters in the local Universe at z ≤ 0.03
Böhringer, Hans; Chon, Gayoung
It is important to map the large-scale matter distribution in the local Universe for cosmological studies, such as the tracing of the large-scale peculiar velocity flow, the characterisation of the environment for different astronomical objects, and for precision measurements of cosmological parameters. We used X-ray luminous clusters to map this …
Orbital pericentres and the inferred dark matter halo structure of satellite galaxies
Bullock, James S.; Robles, Victor H.
Using the phat-ELVIS suite of Milky Way-sized halo simulations, we show that subhalo orbital pericentres, rperi, correlate with their dark matter halo structural properties. Specifically, at fixed maximum circular velocity, Vmax, subhaloes with smaller rperi are more concentrated (have smaller rmax value…