Search Publications
Are Quasi-periodic Pulsations Independent of Loop Oscillations in Solar Flare?
Li, Dong; Feng, Song; Ning, Zongjun +3 more
We investigated oscillations in an M8.7 solar flare (SOL2014-10-22), including quasi-periodic pulsations (QPPs) in light curves and Doppler shift oscillations in the flare loops. Using Bayesian-based Markov Chain Monte Carlo, Fast Fourier Transform, and wavelet analysis method, QPPs were identified at microwave and hard X-ray wave bands during the…
HST UV Spectroscopy of the Dwarf Starburst Galaxy Pox 186
Cannon, John M.; Skillman, Evan D.; Mehta, Vihang +4 more
Studying the galaxies responsible for reionization is often conducted through local reionization-era analogs; however, many of these local analogs are too massive to be representative of the low-mass star-forming galaxies that are thought to play a dominant role in reionization. The local, low-mass dwarf starburst galaxy Pox 186 is one such system…
Flares, Warps, Truncations, and Satellite: The Ultra-thin Galaxy UGC 11859
Beckman, John E.; Borlaff, Alejandro S.; Fanelli, Michael N. +2 more
The structure of the outskirts of galaxies provides valuable information about their past and evolution. Due to their projected orientation, edge-on isolated galaxies effectively serve as test labs in which to study the three-dimensional structures of galaxies, including warps and flares, and to explore the possible sources of such distortions. We…
The Neon Gap: Probing Ionization with Dwarf Galaxies at z 1
Koo, David C.; Guo, Yicheng; Guhathakurta, Puragra +2 more
We present measurements of [NeIII]λ3869 emission in z ~ 1 low-mass galaxies taken from the Keck/DEIMOS spectroscopic surveys HALO7D and DEEPwinds. We identify 167 individual galaxies with significant [NeIII] emission lines, including 112 "dwarf" galaxies with $\mathrm{log}({M}_{\star }/{M}_{\odot })\lt \,9.5$ , with 0.3 < z < 1.4. We also me…
HOPS 361-C's Jet Decelerating and Precessing through NGC 2071 IR
Quillen, Alice C.; Rubinstein, Adam E.; Federman, Samuel +5 more
We present a two-epoch Hubble Space Telescope study of NGC 2071 IR highlighting HOPS 361-C, a protostar producing an arced 0.2 parsec-scale jet. The proper motions for the brightest knots decrease from 350 to 100 km s-1 with increasing distance from the source. The [Fe II] and Paβ emission line intensity ratio gives a velocity jump thro…
Structure and Kinematics of Sh2-138-A Distant Hub-filament System in the Outer Galactic Plane
Baug, Tapas; Dewangan, Lokesh K.; Mallick, Kshitiz K. +2 more
We present a molecular line study of the Sh2-138 (IRAS 22308+5812) hub-filament system with the aim of investigating its structure and kinematics. Archival CO molecular line data from the Canadian Galactic Plane Survey (CO(J = 1-0)) for the wider region (~50' × 50') and the James Clerk Maxwell Telescope (CO(3-2), 13CO(3-2), and C18…
The Type II-P Supernova 2019mhm and Constraints on its Progenitor System
Rest, A.; Foley, R. J.; Kilpatrick, C. D. +4 more
We present pre- and postexplosion observations of the Type II-P supernova (SN II-P) 2019mhm located in NGC 6753. Based on optical spectroscopy and photometry, we show that SN 2019mhm exhibits broad lines of hydrogen with a velocity of -8500 ± 200 km s-1 and a 111 ± 2 day extended plateau in its luminosity, typical of the Type II-P subcl…
Circumgalactic Medium at High Halo Masses-Signatures of Cold Gas Depletion in Luminous Red Galaxies
Smailagić, Marijana; Prochaska, Jason Xavier; Burchett, Joseph +1 more
We study ultraviolet H I and metal-line transitions in the circumgalactic medium (CGM) of 15 massive, quenched luminous red galaxies (LRGs) at redshift z ~ 0.5 and with impact parameters up to 400 kpc. We selected eight LRG-CGM systems to study general properties of the CGM around LRGs, while the other seven are already known to contain cool CGM g…
The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. VI. The Star Formation History and Dust Production in Andromeda IX
Abdollahi, Hedieh; Javadi, Atefeh; Mirtorabi, Mohammad Taghi +9 more
We present a photometric study of the resolved stellar populations in Andromeda IX (And IX), the closest satellite to M31, a metal-poor and low-mass dwarf spheroidal galaxy. We estimate a distance modulus of ${24.56}_{-0.15}^{+0.05}$ mag based on the tip of the red giant branch. By probing the variability of asymptotic giant branch stars, we study…
CO Excitation in High-z Main-sequence Analogues: Resolved CO(4-3)/CO(3-2) Line Ratios in DYNAMO Galaxies
Glazebrook, Karl; Lenkić, Laura; Bolatto, Alberto D. +6 more
The spectral line energy distribution of carbon monoxide contains information about the physical conditions of the star-forming molecular hydrogen gas; however, the relation to local radiation field properties is poorly constrained. Using ~1-2 kpc scale Atacama Large Millimeter Array observations of CO(3-2) and CO(4-3), we characterize the CO(4-3)…