Search Publications
Chasing Shadows: Rotation of the Azimuthal Asymmetry in the TW Hya Disk
Weinberger, Alycia J.; Debes, John H.; Roberge, Aki +8 more
We have obtained new images of the protoplanetary disk orbiting TW Hya in visible, total intensity light with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST), using the newly commissioned BAR5 occulter. These HST/STIS observations achieved an inner working angle of ∼0.″2, or 11.7 au, probing the system at angula…
PHAT. XIX. The Ancient Star Formation History of the M31 Disk
Bell, Eric F.; Monachesi, Antonela; Dolphin, Andrew E. +7 more
We map the star formation history across M31 by fitting stellar evolution models to color-magnitude diagrams of each 83″ × 83″ (0.3 × 1.4 kpc, deprojected) region of the Panchromatic Hubble Andromeda Treasury (PHAT) survey outside of the innermost 6\prime × 12\prime portion. We find that most of the star formation occurred pr…
Using Long-term Millisecond Pulsar Timing to Obtain Physical Characteristics of the Bulge Globular Cluster Terzan 5
Cadelano, Mario; Freire, Paulo C. C.; Ransom, Scott M. +4 more
Over the past decade, the discovery of three unique stellar populations and a large number of confirmed pulsars within the globular cluster Terzan 5 has raised questions over its classification. Using the long-term radio pulsar timing of 36 ms pulsars in the cluster core, we provide new measurements of key physical properties of the system. As Ter…
The Chandra COSMOS Legacy Survey: Energy Spectrum of the Cosmic X-Ray Background and Constraints on Undetected Populations
Treister, E.; Comastri, Andrea; Elvis, Martin +15 more
Using Chandra observations in the 2.15 deg2 COSMOS-legacy field, we present one of the most accurate measurements of the Cosmic X-ray Background (CXB) spectrum to date in the [0.3-7] keV energy band. The CXB has three distinct components: contributions from two Galactic collisional thermal plasmas at kT ∼ 0.27 and 0.07 keV and an extrag…
High Lyman Continuum Escape Fraction in a Lensed Young Compact Dwarf Galaxy at z = 2.5
Fan, Xiaohui; Jiang, Linhua; Cai, Zheng +2 more
We present the HST WFC3/F275W UV imaging observations of A2218-Flanking, a lensed compact dwarf galaxy at redshift z≈ 2.5. The stellar mass of A2218-Flanking is {log}({M}* /{M}⊙ )={9.14}-0.04+0.07 and SFR is {12.5}-7.4+3.8 {M}⊙ yr-1 after correcting the magnif…
The Origins of [C II] Emission in Local Star-forming Galaxies
Boquien, M.; Rigopoulou, D.; Armus, L. +17 more
The [C II] 158 µm fine-structure line is the brightest emission line observed in local star-forming galaxies. As a major coolant of the gas-phase interstellar medium, [C II] balances the heating, including that due to far-ultraviolet photons, which heat the gas via the photoelectric effect. However, the origin of [C II] emission remains uncl…
The Complete Infrared View of Active Galactic Nuclei from the 70 Month Swift/BAT Catalog
Ueda, Yoshihiro; Kawamuro, Taiki; Ricci, Claudio +5 more
We systematically investigate the near- to far-infrared (FIR) photometric properties of a nearly complete sample of local active galactic nuclei (AGNs) detected in the Swift/Burst Alert Telescope (BAT) all-sky ultra-hard X-ray (14-195 keV) survey. Out of 606 non-blazar AGNs in the Swift/BAT 70 month catalog at high galactic latitudes of | b| > …
The Evolution of the Tully-Fisher Relation between z ∼ 2.3 and z ∼ 0.9 with KMOS3D
Lutz, D.; Wuyts, S.; Förster Schreiber, N. M. +24 more
We investigate the stellar mass and baryonic mass Tully-Fisher relations (TFRs) of massive star-forming disk galaxies at redshift z∼ 2.3 and z∼ 0.9 as part of the {{KMOS}}3{{D}} integral field spectroscopy survey. Our spatially resolved data allow reliable modeling of individual galaxies, including the effect of pressure support on the …
Constraints on Axion-like Particles from X-Ray Observations of NGC1275
Berg, Marcus; Conlon, Joseph P.; Day, Francesca +4 more
Axion-like particles (ALPs) can induce localized oscillatory modulations in the spectra of photon sources passing through astrophysical magnetic fields. Ultra-deep Chandra observations of the Perseus cluster contain over 5× {10}5 counts from the active galactic nucleus (AGN) of the central cluster galaxy NGC1275 and represent a data set…
The Tip of the Red Giant Branch Distances to Type Ia Supernova Host Galaxies. IV. Color Dependence and Zero-point Calibration
Lee, Myung Gyoon; Jang, In Sung
We present a revised Tip of the Red Giant Branch (TRGB) calibration, accurate to 2.7% of distance. A modified TRGB magnitude corrected for its color dependence, the QT magnitude, is introduced for better measurement of the TRGB. We determine the color-magnitude relation of the TRGB from photometry of deep images of HST/ACS fields around eight near…