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Possible Periodic Dips in the Pulsating Ultraluminous X-Ray Source M51 ULX-7
Enoto, Teruaki; Ueda, Yoshihiro; Hu, Chin-Ping
We report the discovery of possible periodic X-ray dips in a pulsating ultraluminous X-ray source, M51 ULX-7, with archival Chandra observations. With ∼20 days of monitoring in the superorbital descending state, we discovered three dips with separations of ∼2 and ∼8 days via the Bayesian block technique. A phase-dispersion minimization and a ${\ch…
Spectroscopic and photometric time series of the bright RRc star T Sex
Pál, András; Sódor, Ádám; Benkő, József M.
We present spectroscopic time series observations on one of the brightest northern RRc stars, namely T Sex. Additionally, we also analysed extended photometric data sets, particularly the recent observations of the TESS space telescope. The main findings of our studies are as follows: T Sex, unlike all RRc stars whose space photometry has been ana…
The H I Column Density Distribution of the Galactic Disk and Halo
Richter, Philipp; Heckman, Timothy; Savage, Blair D. +8 more
We present a census of neutral gas in the Milky Way disk and halo down to limiting column densities of N(H I) ~ 1014 cm-2 using measurements of H I Lyman series absorption from the Far Ultraviolet Spectroscopic Explorer. Our results are drawn from an analysis of 25 AGN sight lines spread evenly across the sky with Galactic la…
ALMA Observations of Lyα Blob 1: Multiple Major Mergers and Widely Distributed Interstellar Media
Ivison, R. J.; Smail, Ian; Hayes, Matthew +11 more
We present observations of a giant Lyα blob (LAB) in the SSA22 protocluster at z = 3.1, SSA22-LAB1, taken with the Atacama Large Millimeter/submillimeter Array. Dust continuum, along with [C II] 158 µm and CO(4-3) line emission have been detected in LAB1, showing complex morphology and kinematics across a ~100 kpc central region. Seven galax…
KIC 9406652: A laboratory for tilted disks in cataclysmic variable stars. II. Modeling of the orbital light curves
Kimura, Mariko; Osaki, Yoji
KIC 9406652, one of the recently identified IW And-type dwarf novae, is the best target for studying the tilted disk in cataclysmic variable stars. In a previous paper by Kimura et al. (2020b, PASJ, 72, 94), we analyzed its Kepler light curves and found that its orbital light curves during the brightening stage were dominated by the reflection eff…
Even More Rapidly Rotating Pre-main-sequence M Dwarfs with Highly Structured Light Curves: An Initial Survey in the Lower Centaurus-Crux and Upper Centaurus-Lupus Associations
Powell, Brian P.; Kruse, Ethan; Cody, Ann Marie +6 more
Using K2, we recently discovered a new type of periodic photometric variability while analyzing the light curves of members of Upper Sco. The 23 exemplars of this new variability type are all mid-M dwarfs, with short rotation periods. Their phased light curves have one or more broad flux dips or multiple arcuate structures which are not explicable…
The VLA Frontier Fields Survey: Deep, High-resolution Radio Imaging of the MACS Lensing Clusters at 3 and 6 GHz
Smail, I.; Dickinson, M.; Jiménez-Andrade, E. F. +9 more
The Frontier Fields project is an observational campaign targeting six galaxy clusters, with the intention of using the magnification provided by gravitational lensing to study galaxies that are extremely faint or distant. We used the Karl G. Jansky Very Large Array (VLA) at 3 and 6 GHz to observe three Frontier Fields: MACS J0416.1-2403 (z = 0.39…
Comparison of multifrequency positions of extragalactic sources from ICRF3 and Gaia EDR3
Liu, N.; Zhu, Z.; Liu, J. -C. +5 more
Context. Comparisons of optical positions derived from the Gaia mission and radio positions measured by very long baseline interferometry (VLBI) probe the structure of active galactic nuclei (AGN) on the milliarcsecond scale. So far, these comparisons have focused on using the S∕X-band (2/8 GHz) radio positions, but did not take advantage of the V…
Absence of obvious tidal tails around the globular cluster NGC 6397
Vitral, Eduardo; Boldrini, Pierre
In this work, we use N-body simulations performed on GPU to trace the past 10 Gyr dynamical history of a globular cluster (GC) similar to NGC 6397 in the tidal field of a Milky Way-like galaxy and we compare our simulated GCs with data from the third Gaia early data release. Our simulations predict, in contrast to what is deduced from the data, th…
The MOSDEF survey: differences in SFR and metallicity for morphologically selected mergers at z ∼ 2
Barro, Guillermo; Siana, Brian; Shapley, Alice E. +15 more
We study the properties of 55 morphologically-identified merging galaxy systems at z ~ 2. These systems are flagged as mergers based on features such as tidal tails, double nuclei, and asymmetry. Our sample is drawn from the MOSFIRE Deep Evolution Field (MOSDEF) survey, along with a control sample of isolated galaxies at the same redshift. We cons…