Search Publications
Star Formation Across the W3 Complex
Tapia, Mauricio; Román-Zúñiga, Carlos G.; Ybarra, Jason E. +3 more
We present a multi-wavelength analysis of the history of star formation in the W3 complex. Using deep, near-infrared ground-based images combined with images obtained with Spitzer and Chandra observatories, we identified and classified young embedded sources. We identified the principal clusters in the complex and determined their structure and ex…
Using Multiple-viewpoint Observations to Determine the Interaction of Three Coronal Mass Ejections Observed on 2012 March 5
Vourlidas, Angelos; Colaninno, Robin C.
We examine the interaction of three coronal mass ejections (CMEs) that took place on 2012 March 5 at heights less than 20 R ⊙ in the corona. We used a forward fitting model to reconstruct the three-dimensional trajectories and kinematics of the CMEs and determine their interaction in the observations from three viewpoints: Solar and Hel…
On the Viability of the PAH Model as an Explanation of the Unidentified Infrared Emission Features
Zhang, Yong; Kwok, Sun
Polycyclic aromatic hydrocarbon (PAH) molecules are widely considered the preferred candidate for the carrier of the unidentified infrared emission bands observed in the interstellar medium and circumstellar envelopes. In this paper, we report the results of fitting a variety of non-PAH spectra (silicates, hydrogenated amorphous carbon, coal, and …
Constraining the galaxy mass content in the core of A383 using velocity dispersion measurements for individual cluster members
Zitrin, A.; Grillo, C.; Balestra, I. +14 more
We use velocity dispersion measurements of 21 individual cluster members in the core of Abell 383, obtained with Multiple Mirror Telescope Hectospec, to separate the galaxy and the smooth dark halo (DH) lensing contributions. While lensing usually constrains the overall, projected mass density, the innovative use of velocity dispersion measurement…
Depletion of chlorine into HCl ice in a protostellar core. The CHESS spectral survey of OMC-2 FIR 4
Ceccarelli, C.; Dominik, C.; Lis, D. C. +9 more
Context. The freezeout of gas-phase species onto cold dust grains can drastically alter the chemistry and the heating-cooling balance of protostellar material. In contrast to well-known species such as carbon monoxide (CO), the freezeout of various carriers of elements with abundances <10-5 has not yet been well studied.
Aims: O…
Large-scale outflow in quasar LBQS J1206+1052: HST/COS observations
Arav, Nahum; Chamberlain, Carter
Using two orbits of HST/COS archival observations, we measure the location and energetics of a quasar outflow from LBQS J1206+1052. From separate collisional excitation models of observed N III/N III* and S III/S III* troughs, we measure the electron number density n_e of the outflow. Both independent determinations are in full agreement and yield…
North-south asymmetry in global distribution of the solar wind speed during 1985-2013
Tokumaru, Munetoshi; Fujiki, Ken'ichi; Iju, Tomoya
Interplanetary scintillation (IPS) observations made between 1985 and 2013 are used to investigate the north-south (N-S) asymmetry in global distribution of the solar wind speed. The IPS observations clearly demonstrate that the global distribution of the solar wind speed systematically changes with the solar activity. This change is found to clos…
The γ-Ray Detected Narrow-line Seyfert 1 Galaxy 1H 0323+342: Swift Monitoring and Suzaku Spectroscopy
Komossa, S.; Yuan, Weimin; Fuhrmann, L. +3 more
As a radio-loud narrow-line Seyfert 1 galaxy (NLS1) detected by Fermi/LAT in GeV γ-rays, 1H 0323+342 is a remarkable active galactic nucleus showing properties characteristic of both NLS1s and blazars. Here we present results of simultaneous X-ray and UV/optical monitoring observations on 1H 0323+342 taken with the UV/Optical Telescope and X-ray T…
The M31 Near-infrared Period-Luminosity Relation and its Non-linearity for δ Cep Variables with 0.5 <= log (P) <= 1.7
Lee, Chien-Hsiu; Bender, Ralf; Seitz, Stella +7 more
We present the largest M31 near-infrared (F110W (close to J band), F160W (H band)) Cepheid sample so far. The sample consists of 371 Cepheids with photometry obtained from the Hubble Space Telescope PHAT program. The sample of 319 fundamental mode Cepheids, 16 first overtone Cepheids, and 36 type II Cepheids was identified using the median absolut…
The nuclear and extended infrared emission of the Seyfert galaxy NGC 2992 and the interacting system Arp 245
Valtchanov, I.; Esquej, P.; Pérez García, A. M. +14 more
We present subarcsecond resolution infrared (IR) imaging and mid-IR (MIR) spectroscopic observations of the Seyfert 1.9 galaxy NGC 2992, obtained with the Gemini North Telescope and the Gran Telescopio CANARIAS (GTC). The N-band image reveals faint extended emission out to ∼3 kpc, and the polycyclic aromatic hydrocarbon features detected in the GT…