Search Publications
AGN Activity in Nucleated Galaxies as Measured by Chandra
Baldassare, Vivienne F.; Gültekin, Kayhan; Gnedin, Oleg Y. +4 more
Motivated by theoretical expectations that nuclear star clusters (NSCs) in galactic centers may provide a favorable environment for supermassive black holes to form and/or efficiently grow, we set out to measure the fraction of nearby nucleated galaxies that also host an active galactic nucleus. We targeted a distance-limited sample of 98 objects …
Dust in Clusters: Separating the Contribution of Galaxies and Intracluster Media
López-Corredoira, M.; Gutiérrez, C. M.
We have analyzed a sample of 327 clusters of galaxies, spanning the range of 0.06-0.70 in redshift. Strong constraints on their mean intracluster emission of dust have been obtained using maps and catalogs from the Herschel MerMES project; within a radius of 5 arcmin centered in each cluster, the 95% C.L. limits obtained are 86.6, 48.2, and 30.9 m…
A Heuristic Approach to Remove the Background Intensity on White-light Solar Images. I. STEREO/HI-1 Heliospheric Images
Stenborg, Guillermo; Howard, Russell A.
White-light coronal and heliospheric imagers observe scattering of photospheric light from both dust particles (the F-Corona) and free electrons in the corona (the K-corona). The separation of the two coronae is thus vitally important to reveal the faint K-coronal structures (e.g., streamers, co-rotating interaction regions, coronal mass ejections…
Constraining C III] Emission in a Sample of Five Luminous z = 5.7 Galaxies
Siana, Brian; Fan, Xiaohui; Jiang, Linhua +6 more
Recent observations have suggested that the C III]λ 1907/1909 emission lines could be alternative diagnostic lines for galaxies in the reionization epoch. We use the F128N narrowband filter on the Hubble Space Telescope’s (HST) Wide Field Camera 3 (WFC3) to search for C III] emission in a sample of five galaxies at z = 5.7 in the Subaru Deep Field…
Planck Lensing and Cosmic Infrared Background Cross-correlation with Fermi-LAT: Tracing Dark Matter Signals in the Gamma-ray Background
Cooray, Asantha; Feng, Chang; Keating, Brian
The extragalactic γ-ray background and its spatial anisotropy could potentially contain a signature of dark matter (DM) annihilation or particle decay. Astrophysical foregrounds, such as blazars and star-forming galaxies (SFGs), however, dominate the γ-ray background, precluding an easy detection of the signal associated with the DM annihilation o…
Listing of 502 Times When the Ulysses Magnetic Fields Instrument Observed Waves Due to Newborn Interstellar Pickup Protons
Isenberg, Philip A.; Murphy, Neil; Cannon, Bradford E. +4 more
In two earlier publications we analyzed 502 intervals of magnetic waves excited by newborn interstellar pickup protons that were observed by the Ulysses spacecraft. Due to the considerable effort required in identifying these events, we provide a list of the times for the 502 wave event intervals previously identified. In the process, we provide a…
A Comparison of the Most Massive Quiescent Galaxies from z ∼ 3 to the Present: Slow Evolution in Size, and spheroid-dominated
Patel, Shannon G.; Quadri, Ryan F.; Williams, Rik J. +2 more
We use Hubble Space Telescope imaging to study the structural properties of 10 of the most massive (M≥slant {10}11.25 {M}⊙ ) quiescent galaxies (QGs) in the UKIDSS UDS at 2.5< z< 3.0. The low spatial density of these galaxies required targeted WFC3 H 160 imaging, as such systems are rare in existing surveys l…
Extremely Red Submillimeter Galaxies: New z ≳ 4-6 Candidates Discovered using ALMA and Jansky VLA
Ivison, R. J.; Tamura, Yoichi; Kohno, Kotaro +18 more
We present the detailed characterization of two extremely red submillimeter galaxies (SMGs), ASXDF1100.053.1 and 231.1, with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Jansky Very Large Array. These SMGs were originally selected using AzTEC at 1100 µm, and are observed by Herschel to be faint at 100-500 µm. Their (…
The Characteristics of Thin Magnetic Flux Tubes in the Lower Solar Atmosphere Observed by Hinode/SOT in the G band and in Ca II H Bright Points
Xiong, Jianping; Yang, Yunfei; Jin, Chunlan +5 more
Photospheric bright points (PBPs) and chromospheric bright points (CBPs) reflect the cross sections of magnetic flux tubes at different heights of the lower solar atmosphere. We aim to study the fine 3D structures and transportation dynamics of the magnetic flux tubes using G-band and simultaneous Ca II H image-series from the Solar Optical Telesc…
Geometric Corroboration of the Earliest Lensed Galaxy at z ≃ 10.8 from Robust Free-form Modelling
Broadhurst, Tom; Zitrin, Adi; Coe, Dan +4 more
A multiply lensed galaxy, MACS0647-JD, with a probable photometric redshift of z≃ {10.7}-0.4+0.6 is claimed to constitute one of the very earliest known galaxies, formed well before reionization was completed. However, spectral evidence that MACS0647-JD lies at high redshift has proven infeasible and so here we seek an indepe…