Search Publications
The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). III. The Mass Function of Young Stellar Clusters in M33
Williams, Benjamin F.; Johnson, L. Clifton; Dolphin, Andrew +7 more
We measure the star cluster mass function (CMF) for the Local Group galaxy M33. We use the catalog of stellar clusters selected from the Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region survey. We analyze 711 clusters in M33 with $7.0\lt \mathrm{log}(\mathrm{Age}/\mathrm{yr})\lt 8.5$ , and log(M/M ⊙) > 3.0 as determ…
Evaluating Lyα Emission as a Tracer of the Largest Cosmic Structure at z 2.47
Pentericci, Laura; Hathi, Nimish; Sawicki, Marcin +13 more
The discovery and spectroscopic confirmation of Hyperion, a protosupercluster at z ~ 2.47, provides an unprecedented opportunity to study distant galaxies in the context of their large-scale environment. We carry out deep narrowband imaging of a ≈1° × 1° region around Hyperion and select 157 Lyα emitters (LAEs). The inferred LAE overdensity is δ <…
Quiet Sun Center to Limb Variation of the Linear Polarization Observed by CLASP2 Across the Mg II h and k Lines
Auchère, F.; Kubo, M.; De Pontieu, B. +25 more
The CLASP2 (Chromospheric LAyer Spectro-Polarimeter 2) sounding rocket mission was launched on 2019 April 11. CLASP2 measured the four Stokes parameters of the Mg II h and k spectral region around 2800 Å along a 200″ slit at three locations on the solar disk, achieving the first spatially and spectrally resolved observations of the solar polarizat…
The TREX Survey: Kinematical Complexity Throughout M33's Stellar Disk and Evidence for a Stellar Halo
Williams, Benjamin F.; Gilbert, Karoline M.; Wojno, Jennifer +9 more
We present initial results from a large spectroscopic survey of stars throughout M33's stellar disk. We analyze a sample of 1667 red giant branch (RGB) stars extending to projected distances of ~11 kpc from M33's center (~18 kpc, or ~10 scale lengths, in the plane of the disk). The line-of-sight velocities of RGB stars show the presence of two kin…
Absolute Calibration of Cepheid Period-Luminosity Relations in NGC 4258
Casertano, Stefano; Filippenko, Alexei V.; Riess, Adam G. +6 more
Owing to its accurate distance measured from water-maser motions, NGC 4258 is one of the most important anchors for calibrating the Cepheid period-luminosity relations (PLRs). We expand on previous efforts and carry out a new Cepheid search in this system using the Hubble Space Telescope. We discover and measure a sample of 669 Cepheids in four ne…
Multi-spacecraft Observations of the Evolution of Interplanetary Coronal Mass Ejections between 0.3 and 2.2 au: Conjunctions with the Juno Spacecraft
Lugaz, Noé; Scolini, Camilla; Winslow, Réka M. +4 more
We present a catalog of 35 interplanetary coronal mass ejections (ICMEs) observed by the Juno spacecraft and at least one other spacecraft during its cruise phase to Jupiter. We identify events observed by MESSENGER, Venus Express, Wind, and STEREO with magnetic features that can be matched unambiguously with those observed by Juno. A multi-spacec…
Ensemble Simulations of the 2012 July 12 Coronal Mass Ejection with the Constant-turn Flux Rope Model
Pogorelov, Nikolai V.; Arge, Charles N.; Singh, Talwinder +1 more
Flux-rope-based magnetohydrodynamic modeling of coronal mass ejections (CMEs) is a promising tool for prediction of the CME arrival time and magnetic field at Earth. In this work, we introduce a constant-turn flux rope model and use it to simulate the 2012 July 12 16:48 CME in the inner heliosphere. We constrain the initial parameters of this CME …
HyGAL: Characterizing the Galactic Interstellar Medium with Observations of Hydrides and Other Small Molecules. I. Survey Description and a First Look Toward W3(OH), W3 IRS5, and NGC 7538 IRS1
Menten, K. M.; Falgarone, E.; Godard, B. +23 more
The HyGAL Stratospheric Observatory for Infrared Astronomy legacy program surveys six hydride molecules-ArH+, OH+, H2O+, SH, OH, and CH-and two atomic constituents-C+ and O-within the diffuse interstellar medium (ISM) by means of absorption-line spectroscopy toward 25 bright Galactic backgroun…
Another Look at Erupting Minifilaments at the Base of Solar X-Ray Polar Coronal "Standard" and "Blowout" Jets
Panesar, Navdeep K.; Moore, Ronald L.; Sterling, Alphonse C.
We examine 21 solar polar coronal jets that we identify in soft X-ray images obtained from the Hinode/X-ray telescope (XRT). We identify 11 of these as blowout jets and four as standard jets (with six uncertain), based on their X-ray-spire widths being respectively wide or narrow (compared to the jet's base) in the XRT images. From corresponding e…
Magnetic Field Intermittency in the Solar Wind: Parker Solar Probe and SolO Observations Ranging from the Alfvén Region up to 1 AU
Fedorov, A.; Louarn, P.; Velli, Marco +19 more
Parker Solar Probe (PSP) and SolO data are utilized to investigate magnetic field intermittency in the solar wind (SW). Small-scale intermittency (20-100 d i ) is observed to radially strengthen when methods relying on higher-order moments are considered (SF q ; SDK), but no clear trend is observed at larger scales. However,…