Search Publications
HST Imaging of the Local Volume Dwarf Galaxies Pisces A and B: Prototypes for Local Group Dwarfs
Dolphin, Andrew E.; Weisz, Daniel R.; Putman, Mary E. +3 more
We present observations of the Pisces A and B galaxies with the Advanced Camera for Surveys on the Hubble Space Telescope. Photometry from these images clearly resolves a red giant branch (RGB) for both objects, demonstrating that they are nearby dwarf galaxies. We describe a Bayesian inferential approach to determining the distance to these galax…
Mapping Seyfert and LINER Excitation Modes in the Inner kpc of NGC 3393
Elvis, Martin; Raymond, John; Storchi-Bergmann, Thaisa +5 more
We mapped the extended narrowline region (ENLR) of NGC 3393 on scales of r≲ 4\prime\prime (∼ 1 kpc) from the nucleus using emission line images of Hα λ6563, [O III]λ 5007, and [S II]λ λ 6717,6731, taken with the Hubble Space Telescope as part of the CHandra survey of Extended Emission line Regions in nearby Seyfert galaxies (CHEERS). By…
ALMA Imaging of the CO (6-5) Line Emission in NGC 7130*
Inami, Hanae; Murphy, Eric; van der Werf, Paul +11 more
In this paper, we report our high-resolution (0.″20 × 0.″14 or ∼70 × 49 pc) observations of the CO(6-5) line emission, which probes warm and dense molecular gas, and the 434 µm dust continuum in the nuclear region of NGC 7130, obtained with the Atacama Large Millimeter Array (ALMA). The CO line and dust continuum fluxes detected in our ALMA …
A Stellar Velocity Dispersion for a Strongly-lensed, Intermediate-mass Quiescent Galaxy at z=2.8
Franx, Marijn; Muzzin, Adam; van de Sande, Jesse +1 more
Measuring stellar velocity dispersions of quiescent galaxies beyond z∼ 2 is observationally challenging. Such measurements require near-infrared spectra with a continuum detection of at least moderate signal to noise, often necessitating long integrations. In this paper, we present deep X-Shooter spectroscopy of one of only two known gravitational…
Comparison between 2D and 3D Parameters of 306 Front-side Halo CMEs from 2009 to 2013
Cho, K. -S.; Moon, Y. -J.; Jang, Soojeong +2 more
We investigate 306 LASCO front-side halo (partial and full) CMEs from 2009 to 2013, which are well-observed by both the Solar and Heliospheric Observatory (SOHO) and the Solar TErrestrial RElations Observatory (STEREO). These CMEs have two-dimensional (2D) parameters, such as speed, angular width, and propagation direction, from a single spacecraf…
No Evidence of Intrinsic Optical/Near-infrared Linear Polarization for V404 Cygni during Its Bright Outburst in 2015: Broadband Modeling and Constraint on Jet Parameters
Morokuma, T.; Cheung, C. C.; Fukazawa, Y. +39 more
We present simultaneous optical and near-infrared (NIR) polarimetric results for the black hole binary V404 Cyg spanning the duration of its seven-day-long optically brightest phase of its 2015 June outburst. The simultaneous R- and K s -band light curves showed almost the same temporal variation except for the isolated (∼30-minute dur…
Evolution of the X-Ray Properties of the Transient Magnetar XTE J1810-197
Halpern, J. P.; Alford, J. A. J.
We report on X-ray observations of the 5.54 s transient magnetar XTE J1810-197 using the XMM-Newton and Chandra observatories, analyzing new data from 2008 through 2014, and re-analyzing data from 2003 through 2007 with the benefit of these six years of new data. From the discovery of XTE J1810-197 during its 2003 outburst to the most recent 2014 …
Turbulence-generated Proton-scale Structures in the Terrestrial Magnetosheath
Echim, Marius M.; Consolini, Giuseppe; Vörös, Zoltán +2 more
Recent results of numerical magnetohydrodynamic simulations suggest that in collisionless space plasmas, turbulence can spontaneously generate thin current sheets. These coherent structures can partially explain the intermittency and the non-homogenous distribution of localized plasma heating in turbulence. In this Letter, Cluster multi-point obse…
Globular Clusters, Ultracompact Dwarfs, and Dwarf Galaxies in Abell 2744 at a Redshift of 0.308
Lee, Myung Gyoon; Jang, In Sung
We report a photometric study of globular clusters (GCs), ultracompact dwarfs (UCDs), and dwarf galaxies in the giant merging galaxy cluster Abell 2744 at z = 0.308. Color-magnitude diagrams of the point sources derived from deep F814W (rest frame r‧) and F105W (rest frame I) images of Abell 2744 in the Hubble Space Telescope Frontier Field show a…
Peering Through the Dust: NuSTAR Observations of Two FIRST-2MASS Red Quasars
Brandt, W. N.; Koss, Michael; Yaqoob, Tahir +17 more
Some reddened quasars appear to be transitional objects in the paradigm of merger-induced black hole growth/galaxy evolution, where a heavily obscured nucleus starts to be unveiled by powerful quasar winds evacuating the surrounding cocoon of dust and gas. Hard X-ray observations are able to peer through this gas and dust, revealing the properties…