Search Publications
X-Ray and Optical Study of the Gamma-ray Source 3FGL J0838.8-2829: Identification of a Candidate Millisecond Pulsar Binary and an Asynchronous Polar
Thorstensen, John R.; Bogdanov, Slavko; Halpern, Jules P.
We observed the field of the Fermi source 3FGL J0838.8-2829 in optical and X-rays, initially motivated by the cataclysmic variable (CV) 1RXS J083842.1-282723 that lies within its error circle. Several X-ray sources first classified as CVs have turned out to be γ-ray emitting millisecond pulsars (MSPs). We find that 1RXS J083842.1-282723 is in fact…
A Black Hole Mass Determination for the Compact Galaxy Mrk 1216
Gebhardt, Karl; Richstone, Douglas O.; Husemann, Bernd +4 more
Mrk 1216 is a nearby, early-type galaxy with a small effective radius of 2.8 kpc and a large stellar velocity dispersion of 308 km s-1 for its K-band luminosity of 1.4× {10}11 {L}⊙ . Using integral field spectroscopy assisted by adaptive optics from Gemini North, we measure spatially resolved stellar kinematics wit…
Successive Homologous Coronal Mass Ejections Driven by Shearing and Converging Motions in Solar Active Region NOAA 12371
Vemareddy, P.
We study the magnetic field evolution in AR 12371, related to its successive eruptive nature. During the disk transit of seven days, the active region (AR) launched four sequential fast coronal mass ejections (CMEs), which are associated with long duration M-class flares. Morphological study delineates a pre-eruptive coronal sigmoid structure abov…
The Role of the Most Luminous Obscured AGNs in Galaxy Assembly at z ∼ 2
Tsai, Chao-Wei; Moustakas, Leonidas; Stern, Daniel +14 more
We present Hubble Space Telescope WFC3 F160W imaging and infrared spectral energy distributions for 12 extremely luminous, obscured active galactic nuclei (AGNs) at 1.8 < z < 2.7 selected via “hot, dust-obscured” mid-infrared colors. Their infrared luminosities span (2-15) × 1013 L ⊙, making them among the most luminous…
Variability of the Magnetic Field Power Spectrum in the Solar Wind at Electron Scales
Escoubet, C. P.; Alexandrova, O.; Turc, L. +4 more
At electron scales, the power spectrum of solar-wind magnetic fluctuations can be highly variable and the dissipation mechanisms of the magnetic energy into the various particle species is under debate. In this paper, we investigate data from the Cluster mission’s STAFF Search Coil magnetometer when the level of turbulence is sufficiently high tha…
On the Link between the Release of Solar Energetic Particles Measured at Widespread Heliolongitudes and the Properties of the Associated Coronal Shocks
Lario, D.; Kwon, R. -Y.; Riley, P. +1 more
Under the paradigm that the main agents in the acceleration of solar energetic particles (SEPs) are shocks initially driven by coronal mass ejections, we analyze whether the properties of the shocks in the corona inferred from combining extreme-ultraviolet (EUV) and white-light (WL) observations from multiple vantage points together with magnetohy…
The Ages of Passive Galaxies in a z = 1.62 Protocluster
Papovich, Casey; Tran, Kim-Vy H.; Willmer, Christopher N. A. +9 more
We present a study of the relation between galaxy stellar age and mass for 14 members of the z = 1.62 protocluster IRC 0218, using multiband imaging and HST G102 and G141 grism spectroscopy. Using UVJ colors to separate galaxies into star-forming and quiescent populations, we find that, at stellar masses {M}* ≥slant {10}10.85…
The State-of-the-art HST Astro-photometric Analysis of the Core of ω Centauri. II. Differential-reddening Map
Anderson, J.; Bedin, L. R.; King, I. R. +3 more
We take advantage of the exquisite quality of the Hubble Space Telescope astro-photometric catalog of the core of ωCen presented in the first paper of this series to derive a high-resolution, high-precision, high-accuracy differential-reddening map of the field. The map has a spatial resolution of 2 × 2 arcsec2 over a total field of vie…
Inflows, Outflows, and a Giant Donor in the Remarkable Recurrent Nova M31N 2008-12a?—Hubble Space Telescope Photometry of the 2015 Eruption
Ness, J. -U.; Henze, M.; Shafter, A. W. +14 more
The recurrent nova M31N 2008-12a experiences annual eruptions, contains a near-Chandrasekhar-mass white dwarf, and has the largest mass accretion rate in any nova system. In this paper, we present Hubble Space Telescope (HST) WFC3/UVIS photometry of the late decline of the 2015 eruption. We couple these new data with archival HST observations of t…
The Local [C II] 158 µm Emission Line Luminosity Function
Capak, Peter; Hemmati, Shoubaneh; Faisst, Andreas +4 more
We present, for the first time, the local [C II] 158 µm emission line luminosity function measured using a sample of more than 500 galaxies from the Revised Bright Galaxy Sample. [C II] luminosities are measured from the Herschel PACS observations of the Luminous Infrared Galaxies (LIRGs) in the Great Observatories All-sky LIRG Survey and es…