Search Publications
J- and H-band Imaging of AKARI North Ecliptic Pole Survey Field
Im, Myungshin; Matsuhara, Hideo; Lee, Hyung Mok +2 more
We present the J- and H-band source catalog covering the AKARI North Ecliptic Pole field. Filling the gap between the optical data from other follow-up observations and mid-infrared (MIR) data from AKARI, our near-infrared (NIR) data provides contiguous wavelength coverage from optical to MIR. For the J- and H-band imaging, we used the FLoridA Mul…
How Can Active Region Plasma Escape into the Solar Wind from Below a Closed Helmet Streamer?
Pick, M.; Mandrini, C. H.; van Driel-Gesztelyi, L. +6 more
Recent studies show that active-region (AR) upflowing plasma, observed by the EUV-Imaging Spectrometer (EIS) onboard Hinode, can gain access to open-field lines and be released into the solar wind (SW) via magnetic-interchange reconnection at magnetic null-points in pseudo-streamer configurations. When only one bipolar AR is present on the Sun and…
Non-steady state tidal heating of Enceladus
Kurita, K.; Hussmann, H.; Shoji, D. +1 more
Enceladus is one of the most geologically active bodies in the Solar System. The satellite's diverse surface suggests that Enceladus was subject to past episodic heating. It is largely probable that the activity of Enceladus is not in a steady state. In order to analyze the non-steady state heating, thermal and orbital coupled calculation is neede…
Polycyclic aromatic hydrocarbon feature deficit of starburst galaxies in the AKARI North Ecliptic Pole Deep field
Inami, H.; Armus, L.; Serjeant, S. +6 more
We study the behaviour of polycyclic aromatic hydrocarbon (PAH) emission in galaxies at z = 0.3-1.4 using 1868 samples from the revised catalogue of AKARI North Ecliptic Pole Deep survey. The continuous filter coverage at 2-24 µm makes it possible to measure 8 µm luminosity, which is dominated by PAH emission, for galaxies at up to z =…
Hubble Space Telescope Observations and Geometric Models of Compact Multipolar Planetary Nebulae
Zhang, Yong; Kwok, Sun; Hsia, Chih-Hao +1 more
We report high angular resolution Hubble Space Telescope observations of 10 compact planetary nebulae (PNs). Many interesting internal structures, including multipolar lobes, arcs, two-dimensional rings, tori, and halos, are revealed for the first time. These results suggest that multipolar structures are common among PNs, and these structures dev…
Pair separation of magnetic elements in the quiet Sun
Gošić, M.; Orozco Suárez, D.; Bellot Rubio, L. +5 more
The dynamic properties of the quiet Sun photosphere can be investigated by analyzing the pair dispersion of small-scale magnetic fields (i.e., magnetic elements). By using 25 h-long Hinode magnetograms at high spatial resolution (0.3 arcsec), we tracked 68 490 magnetic element pairs within a supergranular cell near the disk center. The computed pa…
Helioseismology of Pre-emerging Active Regions. III. Statistical Analysis
Leka, K. D.; Barnes, G.; Birch, A. C. +1 more
The subsurface properties of active regions (ARs) prior to their appearance at the solar surface may shed light on the process of AR formation. Helioseismic holography has been applied to samples taken from two populations of regions on the Sun (pre-emergence and without emergence), each sample having over 100 members, that were selected to minimi…
The Sun's Interior Structure and Dynamics, and the Solar Cycle
Thompson, M. J.; Howe, R.; Broomhall, A. -M. +2 more
The Sun's internal structure and dynamics can be studied with helioseismology, which uses the Sun's natural acoustic oscillations to build up a profile of the solar interior. We discuss how solar acoustic oscillations are affected by the Sun's magnetic field. Careful observations of these effects can be inverted to determine the variations in the …
Inflationary generalized Chaplygin gas and dark energy in light of the Planck and BICEP2 experiments
Kumar, Sumit; Dinda, Bikash R.; Sen, Anjan A.
In this work, we study an inflationary scenario in the presence of generalized Chaplygin gas (GCG). We show that in Einstein gravity, GCG is not a suitable candidate for inflation; but in a five-dimensional brane-world scenario, it can work as a viable inflationary model. We calculate the relevant quantities such as ns, r, and As
On the Nature of the Deeply Embedded Protostar OMC-2 FIR 4
Manoj, P.; Megeath, S. T.; Osorio, M. +7 more
We use mid-infrared to submillimeter data from the Spitzer, Herschel, and Atacama Pathfinder Experiment telescopes to study the bright submillimeter source OMC-2 FIR 4. We find a point source at 8, 24, and 70 µm, and a compact, but extended source at 160, 350, and 870 µm. The peak of the emission from 8 to 70 µm, attributed to th…