Search Publications
PS1-10jh Continues to Follow the Fallback Accretion Rate of a Tidally Disrupted Star
Berger, E.; Rest, A.; Chornock, R. +5 more
We present late-time observations of the tidal disruption event candidate PS1-10jh. UV and optical imaging with Hubble Space Telescope/WFC3 localize the transient to be coincident with the host galaxy nucleus to an accuracy of 0.023 arcsec, corresponding to 66 pc. The UV flux in the F225W filter, measured 3.35 rest-frame years after the peak of th…
High-resolution Imaging of PHIBSS z ∼ 2 Main-sequence Galaxies in CO J = 1 → 0
Wuyts, S.; Förster Schreiber, N. M.; Genzel, R. +14 more
We present Karl Jansky Very Large Array observations of the CO J=1-0 transition in a sample of four z∼ 2 main-sequence galaxies. These galaxies are in the blue sequence of star-forming galaxies at their redshift, and are part of the IRAM Plateau de Bure HIgh-z Blue Sequence Survey which imaged them in CO J=3-2. Two galaxies are imaged here at high…
Constraints on the Initial-Final Mass Relation from Wide Double White Dwarfs
Anderson, Scott F.; Gianninas, A.; Kilic, Mukremin +3 more
We present observational constraints on the initial-final mass relation (IFMR) using wide double white dwarfs (DWDs). We identify 65 new candidate wide DWDs within the Sloan Digital Sky Survey, bringing the number of candidate wide DWDs to 142. We then engage in a spectroscopic follow-up campaign and collect existing spectra for these objects; usi…
The Relation between Luminous AGNs and Star Formation in Their Host Galaxies
Smith, G. P.; Egami, E.; Rieke, G. H. +3 more
We study the relation of active galactic nuclei (AGNs) to star formation in their host galaxies. Our sample includes 205 Type-1 and 85 Type-2 AGNs, 162 detected with Herschel, from fields surrounding 30 galaxy clusters in the Local Cluster Substructure Survey. The sample is identified by optical line widths and ratios after selection to be brighte…
Characteristics of Spiral Arms in Late-type Galaxies
Reid, M. J.; Honig, Z. N.
We have measured the positions of large numbers of H II regions in four nearly face-on, late-type, spiral galaxies: NGC 628 (M74), NGC 1232, NGC 3184, and NGC 5194 (M51). Fitting log-periodic spiral models to segments of each arm yields local estimates of spiral pitch angle and arm width. While pitch angles vary considerably along individual arms,…
A Radio Jet Drives a Molecular and Atomic Gas Outflow in Multiple Regions within One Square Kiloparsec of the Nucleus of the nearby Galaxy IC5063
Combes, F.; Dasyra, K. M.; Bostrom, A. C. +1 more
We analyzed near-infrared data of the nearby galaxy IC5063 taken with the Very Large Telescope SINFONI instrument. IC5063 is an elliptical galaxy that has a radio jet nearly aligned with the major axis of a gas disk in its center. The data reveal multiple signatures of molecular and atomic gas that has been kinematically distorted by the passage o…
Star-forming Blue ETGs in Two Newly Discovered Galaxy Overdensities in the HUDF at z=1.84 and 1.9: Unveiling the Progenitors of Passive ETGs in Cluster Cores
Papovich, Casey; Finkelstein, Steven L.; Castellano, Marco +15 more
We present the discovery of two galaxy overdensities in the Hubble Space Telescope UDF: a proto-cluster, HUDFJ0332.4-2746.6 at z=1.84+/- 0.01, and a group, HUDFJ0332.5-2747.3 at z=1.90 ± 0.01. Assuming viralization, the velocity dispersion of HUDFJ0332.4-2746.6 implies a mass of {{M}200}=(2.2+/- 1.8)× {{10}14} {{M}⊙
Anomalous Relative Ar/Ca Coronal Abundances Observed by the Hinode/EUV Imaging Spectrometer Near Sunspots
Doschek, G. A.; Warren, H. P.; Feldman, U.
In determining the element abundance of argon (a high first ionization potential; FIP element) relative to calcium (a low FIP element) in flares, unexpectedly high intensities of two Ar xiv lines (194.40, 187.96 Å) relative to a Ca xiv line (193.87 Å) intensity were found in small (a few arcseconds) regions near sunspots in flare spectra recorded …
Oscillating Light Wall Above a Sunspot Light Bridge
Yang, Shuhong; Zhang, Jun; Xiang, Yongyuan +1 more
With the high tempo-spatial Interface Region Imaging Spectrograph 1330 Å images, we find that many bright structures are rooted in the light bridge of NOAA 12192, forming a light wall. The light wall is brighter than the surrounding areas, and the wall top is much brighter than the wall body. The New Vacuum Solar Telescope Hα and the Solar Dynamic…
New Insights on the Galactic Bulge Initial Mass Function
Salaris, M.; Anderson, J.; Cignoni, M. +15 more
We have derived the Galactic bulge initial mass function (IMF) of the Sagittarius Window Eclipsing Extrasolar Planet Search field in the mass range 0.15 \lt M/{M}⊙ 1.0, using deep photometry collected with the Advanced Camera for Surveys on the Hubble Space Telescope. Observations at several epochs, spread over 9 years, allowed us to s…