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Implications on star formation rate indicators from H II regions and diffuse ionized gas in the M101 Group
Watkins, A. E.; Mihos, J. C.; Harding, P. +1 more
We examine the connection between diffuse ionized gas (DIG), H II regions, and field O and B stars in the nearby spiral M101 and its dwarf companion NGC 5474 using ultra-deep H α narrow-band imaging and archival GALEX UV imaging. We find a strong correlation between DIG H α surface brightness and the incident ionizing flux leaked from the nearby H…
IRIS2+: A Comprehensive Database of Stratified Thermodynamic Models in the Low Solar Atmosphere
De Pontieu, Bart; Gošić, Milan; Sainz Dalda, Alberto +1 more
We present the most comprehensive collection of stratified-in-optical-depth thermodynamic models of the lower solar atmosphere. This database, named IRIS2+, consists of 40,320 synthetic representative profiles (RPs) and their corresponding representative model atmospheres (RMAs). The latter result from inverting the observed RPs, which …
Solar Eruptive Phenomena Associated with Solar Energetic Electron Spectral Types
Krucker, Säm; Wimmer-Schweingruber, Robert F.; Wang, Linghua +3 more
The energy spectral shape of solar energetic electron events carries important information on the energetic electron source/acceleration at the Sun. We investigate the association of six newly identified solar energetic electron spectral types with solar eruptive phenomena, including the downward double-power-law (DDPL) spectrum with break energy …
Imaging the innermost circumstellar environment of the red supergiant WOH G64 in the Large Magellanic Cloud
van Loon, J. Th.; Weigelt, G.; Hofmann, K. -H. +3 more
Context. Significant mass loss in the red supergiant (RSG) phase has great influence on the evolution of massive stars and their final fate as supernovae. Aims. We present near-infrared interferometric imaging of the circumstellar environment of the dust-enshrouded RSG WOH G64 in the Large Magellanic Cloud. Methods. WOH G64 was observed with the G…
Zero-age horizontal branch models for -2.5 ≤ [Fe/H] ≤-0.5 and their implications for the apparent distance moduli of globular clusters
VandenBerg, Don A.
Grids of zero-age horizontal branch (ZAHB) models are presented, along with a suitable interpolation code, for -2.5 ≤ [Fe/H] ≤ -0.5, in steps of 0.2 dex, assuming Y = 0.25 and 0.29, [O/Fe] = +0.4 and +0.6, and [m/Fe] = +0.4 for all of the other α-elements. The HB populations of 37 globular clusters (GCs) are fitted to these ZAHBs to derive their a…
Proper motion of the radio jets in two blazars at redshift above 3
Paragi, Zsolt; Krezinger, Máté; Frey, Sándor +7 more
There is still a limited number of high-redshift (z > 3) active galactic nuclei (AGNs) whose jet kinematics have been studied with very long baseline interferometry (VLBI). Without a dedicated proper motion survey, regularly conducted astrometric VLBI observations of bright radio-emitting AGN with sensitive arrays can be utilized to follow chan…
Detection of open cluster members inside and beyond tidal radius by machine learning methods based on Gaia DR3
Noormohammadi, M.; Khakian Ghomi, M.; Javadi, A.
In our previous work, we introduced a method that combines two unsupervised algorithms: Density-based spatial clustering of applications with noise (DBSCAN) and Gaussian mixture model (GMM). We applied this method to 12 open clusters based on Gaia Early Data Release 3 (EDR3) data, demonstrating its effectiveness in identifying reliable cluster mem…
Multiwavelength and Multimessenger Counterparts of Fast Radio Bursts
Zhang, Bing
Fast radio bursts (FRBs) are brief, highly dispersed bursts detected in the radio band that originate from cosmological distances. The only such event detected in the Milky Way Galaxy, FRB 20200428D—which was associated with an X-ray burst emitted by a magnetar named SGR J1935+2154—revealed the first case of a multiwavelength counterpart of an FRB…
Host Galaxy and Nuclear Properties of IR-selected AGNs with and without Outflow Signatures
Li, Zi-Jian; Dai, Y. Sophia; Oio, Gabriel A. +1 more
Active galactic nucleus (AGN) driven outflows can have a significant impact on the evolution of the host galaxy. In this work, we compare the properties of galaxies that host AGNs with and without outflows. Our sample consists of 103 AGNs identified by mid-IR color–color selection and confirmed with optical spectroscopy at a redshift range of 0.3 …
First Direct Imaging of a Kelvin–Helmholtz Instability by PSP/WISPR
Vourlidas, Angelos; Stenborg, Guillermo; Howard, Russell A. +3 more
We present a comprehensive analysis aimed at proving the hypothesis that a train of small-scale features observed by the Wide-field Imager (WISPR) onboard the Parker Solar Probe (PSP) are the signature of a Kelvin–Helmholtz instability (KHI). These features were seen near the flank of a Coronal Mass Ejection (CME) wake between 7.5 R ⊙ a…