Search Publications
Resolving the Bright HCN(1-0) Emission toward the Seyfert 2 Nucleus of M51: Shock Enhancement by Radio Jets and Weak Masing by Infrared Pumping?
Matsushita, Satoki; Lim, Jeremy; Krips, Melanie +3 more
We present high angular resolution observations of the HCN(1-0) emission (at ~1'' or ~34 pc), together with CO J = 1-0, 2-1, and 3-2 observations, toward the Seyfert 2 nucleus of M51 (NGC 5194). The overall HCN(1-0) distribution and kinematics are very similar to that of the CO lines, which have been indicated as the jet-entrained molecular gas in…
Young Galaxy Candidates in the Hubble Frontier Fields. II. MACS J0416-2403
Broadhurst, Tom; Moustakas, John; Zheng, Wei +14 more
We searched for z ≳ 7 Lyman-break galaxies in the optical-to-mid-infrared Hubble Frontier Field and associated parallel field observations of the strong-lensing cluster MACS J0416-2403. We discovered 22 candidates, of which 6 lie at z ≳ 9 and 1 lies at z ≳ 10. Based on the Hubble and Spitzer photometry, all have secure photometric redshifts and a …
Exploring the Properties of Milliarcsecond Radio Sources
Cao, Shuo; Biesiada, Marek; Zhu, Zong-Hong +1 more
Cosmological applications of the “redshift—angular size” test require knowledge of the linear size of the “standard rod” used. In this paper, we study the properties of a large sample of 140 mas compact radio sources with flux densities measured at 6 and 20 cm, compiled by Gurvits et al. Using the best-fitted cosmological parameters given by Planc…
Hubble Space Telescope High-Resolution Imaging of Kepler Small and Cool Exoplanet Host Stars
Kalas, Paul; Wright, Jason T.; Ciardi, David R. +3 more
High-resolution imaging is an important tool for follow-up study of exoplanet candidates found via transit detection with the Kepler mission. We discuss here Hubble Space Telescope imaging with the WFC3 of 23 stars that host particularly interesting Kepler planet candidates based on their small size and cool equilibrium temperature estimates. Resu…
Rest-frame Optical Emission Lines in Far-infrared-selected Galaxies at z < 1.7 from the FMOS-COSMOS Survey
Daddi, E.; Riguccini, L.; Kartaltepe, Jeyhan S. +15 more
We have used FMOS on Subaru to obtain near-infrared spectroscopy of 123 far-infrared-selected galaxies in COSMOS and the key rest-frame optical emission lines. This is the largest sample of infrared galaxies with near-infrared spectroscopy at these redshifts. The far-infrared selection results in a sample of galaxies that are massive systems that …
The Survey of Lines in M31 (SLIM): Investigating the Origins of [C II] Emission
Fouesneau, M.; Walter, F.; Schinnerer, E. +7 more
The [C II] 158 µm line is one of the strongest emission lines observed in star-forming galaxies and has been empirically measured to correlate with the star-formation rate (SFR) globally and on kiloparsec scales. However, because of the multiphase origins of [C II], one might expect this relation to break down at small scales. We investigate…
NuSTAR Reveals Relativistic Reflection But No Ultra-Fast Outflow in the Quasar Pg∼1211+143
Harrison, F. A.; Craig, W.; Stern, D. +9 more
We report on four epochs of observations of the quasar PG 1211+143 using NuSTAR. The net exposure time is 300 ks. Prior work on this source found suggestive evidence of an ultra-fast outflow (UFO) in the Fe K band with a velocity of approximately 0.1c. The putative flow would carry away a high-mass flux and kinetic power, with broad implications f…
On the interpretation of sub-giant branch morphologies of intermediate-age star clusters with extended main sequence turnoffs
Girardi, Léo; Marigo, Paola; Goudfrooij, Paul +4 more
High-quality photometry of many star clusters in the Magellanic Clouds with ages of 1-2 Gyr revealed main sequence turnoffs (MSTOs) that are significantly wider than can be accounted for by a simple stellar population (SSP). Such extended MSTOs (eMSTOs) are often interpreted in terms of an age spread of several 108 yr, challenging the t…
A Solar Coronal Jet Event Triggers a Coronal Mass Ejection
Wang, Yuming; Shen, Chenglong; Wang, S. +3 more
In this paper, we present multi-point, multi-wavelength observations and analysis of a solar coronal jet and coronal mass ejection (CME) event. Employing the GCS model, we obtained the real (three-dimensional) heliocentric distance and direction of the CME and found it to propagate at a high speed of over 1000 km s-1. The jet erupted be…
Evidence for a Transition Region Response to Penumbral Microjets in Sunspots
Carlsson, M.; Rouppe van der Voort, L. H. M.; Vissers, G. J. M.
Penumbral microjets (PMJs) are short-lived, fine-structured, and bright jets that are generally observed in chromospheric imaging of the penumbra of sunspots. Here we investigate their potential transition region signature by combining observations with the Swedish 1-m Solar Telescope in the Ca ii H and Ca ii 8542 Å lines with ultraviolet imaging …