Search Publications
Modulation of Galactic Cosmic Rays in the Inner Heliosphere over Solar Cycles
Qin, G.; Shen, Z. -N.
The 11- and 22-year modulation of galactic cosmic rays (GCRs) in the inner heliosphere is studied using a numerical model developed by Qin and Shen in 2017. Based on the numerical solutions of Parker’s transport equations, the model incorporates a modified Parker heliospheric magnetic field, a locally static time-delayed heliosphere, and a time-de…
The HST Large Programme on ω Centauri. III. Absolute Proper Motion
Milone, Antonino P.; Anderson, Jay; van der Marel, Roeland P. +11 more
In this paper, we report a new estimate of the absolute proper motion (PM) of the globular cluster NGC 5139 (ω Cen) as part of the HST large program GO-14118+14662. We analyzed a field 17 arcmin southwest of the center of ω Cen and computed PMs with epoch spans of ∼15.1 years. We employed 45 background galaxies to link our relative PMs to an absol…
The Near-infrared Tip of the Red Giant Branch. I. A Calibration in the Isolated Dwarf Galaxy IC 1613
Madore, Barry F.; Freedman, Wendy L.; Beaton, Rachael L. +8 more
Based on observations from the FourStar near-infrared camera on the 6.5 m Baade-Magellan telescope at Las Campanas, Chile, we present calibrations of the JHK luminosities of stars defining the tip of the red giant branch (TRGB) in the halo of the Local Group dwarf galaxy IC 1613. We employ metallicity-independent (rectified) T-band magnitudes—cons…
The NuSTAR Extragalactic Surveys: X-Ray Spectroscopic Analysis of the Bright Hard-band Selected Sample
Harrison, F. A.; Stern, D.; Alexander, D. M. +23 more
We discuss the spectral analysis of a sample of 63 active galactic nuclei (AGN) detected above a limiting flux of S(8{--}24 {keV})=7× {10}-14 {erg} {{{s}}}-1 {{cm}}-2 in the multi-tiered NuSTAR extragalactic survey program. The sources span a redshift range z=0{--}2.1 (median < z> =0.58). The spectral analysi…
No Surviving Companion in Kepler's Supernova
Damiani, Francesco; Ruiz-Lapuente, Pilar; Galbany, Lluís +5 more
We have surveyed Kepler’s supernova remnant in search of the companion star of the explosion. We have gone as deep as 2.6 L ⊙ in all stars within 20% of the radius of the remnant. We use FLAMES at the VLT-UT2 telescope to obtain high-resolution spectra of the stellar candidates selected from Hubble Space Telescope (HST) images. The resu…
The KMOS3D Survey: Rotating Compact Star-forming Galaxies and the Decomposition of Integrated Line Widths
Lutz, D.; Wuyts, S.; Förster Schreiber, N. M. +23 more
Using integral field spectroscopy, we investigate the kinematic properties of 35 massive centrally dense and compact star-forming galaxies (SFGs; {log}{\overline{M}}* [{M}⊙ ]=11.1, {log}({{{Σ }}}1{kpc}[{M}⊙ {kpc}}-2])> 9.5, {log}({M}* /{r}e1.5[{M}⊙
The Pan-STARRS1 Proper-motion Survey for Young Brown Dwarfs in Nearby Star-forming Regions. I. Taurus Discoveries and a Reddening-free Classification Method for Ultracool Dwarfs
Magnier, Eugene A.; Chambers, K. C.; Flewelling, H. +11 more
We are conducting a proper-motion survey for young brown dwarfs in the Taurus-Auriga molecular cloud based on the Pan-STARRS1 3π Survey. Our search uses multi-band photometry and astrometry to select candidates, and is wider (370 deg2) and deeper (down to ≈3 M Jup) than previous searches. We present here our search methods an…
The Shocking Power Sources of LINERs
Ho, Luis C.; Maoz, Dan; Shields, Joseph C. +5 more
The majority of low-ionization nuclear emission-line regions (LINERs) harbor supermassive black holes with very low accretion rates. However, the accretion flows do not produce enough ionizing photons to power the emission lines emitted on scales of ∼100 pc, and therefore additional sources of power are required. We present and analyze Hubble Spac…
Unambiguous Evidence of Filament Splitting-induced Partial Eruptions
Cheng, X.; Ding, M. D.; Kliem, B.
Coronal mass ejections are often considered to result from the full eruption of a magnetic flux rope (MFR). However, it is recognized that, in some events, the MFR may release only part of its flux, with the details of the implied splitting not completely established due to limitations in observations. Here, we investigate two partial eruption eve…
Revolutionizing Our Understanding of AGN Feedback and its Importance to Galaxy Evolution in the Era of the Next Generation Very Large Array
Prandoni, I.; Rujopakarn, W.; Murphy, E. J. +19 more
Energetic feedback by active galactic nuclei (AGNs) plays an important evolutionary role in the regulation of star formation on galactic scales. However, the effects of this feedback as a function of redshift and galaxy properties such as mass, environment, and cold gas content remain poorly understood. The broad frequency coverage (1 to 116 GHz),…