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Properties of the C II 1334 Å Line in Coronal Hole and Quiet Sun as Observed by IRIS
Tripathi, Durgesh; Upendran, Vishal
Coronal holes (CHs) have subdued intensity and net blueshifts when compared to the quiet Sun (QS) at coronal temperatures. At transition region temperatures, such differences are obtained for regions with identical absolute photospheric magnetic flux density (∣B∣). In this work, we use spectroscopic measurements of the C II 1334 Å line from the In…
DIISC-II: Unveiling the Connections between Star Formation and Interstellar Medium in the Extended Ultraviolet Disk of NGC 3344
Heckman, Timothy; Kennicutt, Robert C.; Thilker, David +6 more
We present our investigation of the extended ultraviolet (XUV) disk galaxy, NGC 3344, conducted as part of Deciphering the Interplay between the Interstellar medium, Stars, and the Circumgalactic medium survey. We use surface and aperture photometry of individual young stellar complexes to study star formation and its effect on the physical proper…
Reaching the Oldest Stars beyond the Local Group: Ancient Star Formation in UGC 4483
Aloisi, Alessandra; Cignoni, Michele; Sacchi, Elena +9 more
We present new WFC3/UVIS observations of UGC 4483, the closest example of a metal-poor blue compact dwarf galaxy, with a metallicity of Z ≃ 1/15 Z⊙ and located at a distance of D ≃ 3.4 Mpc. The extremely high quality of our new data allows us to clearly resolve the multiple stellar evolutionary phases populating the color-magnitude diag…
X-Ray Binaries in M51 I: Catalog and Statistics
Chandar, Rupali; Rangelov, Blagoy; Prestwich, Andrea +3 more
We used archival data from the Chandra X-ray Observatory (Chandra) and the Hubble Space Telescope, to identify 334 candidate X-ray binary systems and their potential optical counterparts in the interacting galaxy pair NGC 5194/5195 (M51). We present the catalog and data analysis of X-ray and optical properties for those sources, from the deep 892 …
Superorbital Modulation in the High-mass X-Ray Binary 4U 1538-52 and Possible Modulation in IGR J16393-4643
Roche, Paul; Pottschmidt, Katja; Corbet, Robin H. D. +2 more
Hard X-ray observations with the Neil Gehrels Swift Observatory Burst Alert Telescope (BAT) reveal superorbital modulation in the wind-accreting supergiant high-mass X-ray binary (HMXB) 4U 1538-52 at a period of 14.9130 ± 0.0026 days that is consistent with four times the 3.73 day orbital period. These periods agree with a previously suggested cor…
Revisiting the Spectral Features of Ellerman Bombs and UV Bursts. I. Radiative Hydrodynamic Simulations
Ding, M. D.; Li, Ying; Hong, Jie +1 more
Ellerman bombs (EBs) and UV bursts are both small-scale solar activities that occur in active regions. They are now believed to form at different heights in the lower atmosphere. In this paper, we use one-dimensional radiative hydrodynamic simulations to calculate various line profiles in response to heating in different atmospheric layers. We con…
Constraints on Optical Emission of FAST-detected FRB 20181130B with GWAC Synchronized Observations
Huang, L.; Wang, J.; Li, H. L. +17 more
Multiwavelength simultaneous observations are essential to the constraints on the origin of fast radio bursts (FRBs). However, it is a significant observational challenge due to the nature of FRBs as transients with a radio millisecond duration, which occur randomly in the sky regardless of time and position. Here, we report the search for short-t…
The Carina Nebula and Gum 31 Molecular Complex. III. The Distribution of the 1-3 GHz Radio Continuum across the Whole Nebula
Garay, Guido; Breen, Shari L.; Rebolledo, David +2 more
We report the most detailed 1-3 GHz radio continuum emission map of the nearest region of massive-star formation, the Carina Nebula. As part of a large program with the Australia Telescope Compact Array, we have covered ∼12 deg2, achieving an angular resolution of ∼16″, representing the largest and most complete map of the radio continu…
Spectroscopic Monitoring of the Candidate Tidal Disruption Event in F01004-2237
Jonker, Peter G.; Cannizzaro, Giacomo; Mata-Sánchez, D.
We present results of spectroscopic monitoring observations of the ultraluminous infrared galaxy F01004-2237. This galaxy was observed to undergo changes in its optical spectrum, detected by comparing a spectrum from 2015 with one from 2000. These changes were coincident with photometric brightening. The main changes detected in the optical spectr…
The Fundamental Plane of Massive Quiescent Galaxies at z ∼ 2
Conselice, Christopher J.; Gallazzi, Anna; Zibetti, Stefano +11 more
We examine the Fundamental Plane (FP) and mass-to-light ratio (M/L) scaling relations using the largest sample of massive quiescent galaxies at 1.5 < z < 2.5 to date. The FP (re, σe, Ie) is established using 19 UVJ quiescent galaxies from COSMOS with Hubble Space Telescope HF160W rest-frame optical…