Search Publications
Cospatial Star Formation and Supermassive Black Hole Growth in z ∼ 3 Galaxies: Evidence for In Situ Co-evolution
Elbaz, D.; Ivison, R. J.; Smolčić, V. +7 more
We present a sub-kiloparsec localization of the sites of supermassive black hole (SMBH) growth in three active galactic nuclei (AGNs) at z ∼ 3 in relation to the regions of intense star formation in their hosts. These AGNs are selected from Karl G. Jansky Very Large Array (VLA) and Atacama Large Millimeter/submillimeter Array (ALMA) observations i…
Habitability in the Omega Centauri Cluster
Kane, Stephen R.; Deveny, Sarah J.
The search for exoplanets has encompassed a broad range of stellar environments, from single stars in the solar neighborhood to multiple stars and various open clusters. The stellar environment has a profound effect on planet formation and stability evolution and is thus a key component of exoplanetary studies. Dense stellar environments, such as …
Near-infrared to Mid-infrared Observations of Galaxy Mergers: NGC 2782 and NGC 7727
Lebouteiller, Vianney; Onaka, Takashi; Sakon, Itsuki +5 more
We present the results of near-infrared-to-mid-infrared (NIR-to-MIR) imaging and NIR spectroscopic observations of two galaxy mergers, NGC 2782 (Arp 215) and NGC 7727 (Arp 222), with the Infrared Camera on board AKARI. NGC 2782 shows extended MIR emission in the eastern side of the galaxy, which corresponds to the eastern tidal tail seen in the H …
Testing the Breathing Mode in Intermediate-mass Galaxies and Its Predicted Star Formation Rate-size Anti-correlation
Kelson, Daniel D.; Patel, Shannon G.; Tonnesen, Stephanie +2 more
Recent hydrodynamical simulations predict that stellar feedback in intermediate-mass galaxies (IMGs) can drive strong fluctuations in structure (e.g., half-light radius, R e ). This process operates on timescales of only a few hundred Myr and persists even at late cosmic times. One prediction of this quasi-periodic, galactic-scale “bre…
Twisting/Swirling Motions during a Prominence Eruption as Seen from SDO/AIA
Banerjee, D.; Ray, S.; Pant, V. +2 more
A quiescent prominence was observed at the northwest limb of the Sun using different channels of the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. We report and analyze twisting/swirling motions during and after the prominence eruption. We segregate the observed rotational motions into small and large scales. Small-scale ro…
Evidence for the First Extragalactic Hydrogen Recombination Line Maser in NGC 253
Jiménez-Serra, Izaskun; Martín-Pintado, Jesús; Rico-Villas, Fernando +1 more
We present the first evidence for extragalactic hydrogen recombination line maser emission in the H26α transition toward the inner 13.5 pc nuclear region of the starburst galaxy NGC 253 using the Atacama Large Millimeter/submillimeter Array data. In regions with complex continuum emission (dust, free-free, and synchrotron) we propose to use the re…
Flare Energy Release at the Magnetic Field Polarity Inversion Line during the M1.2 Solar Flare of 2015 March 15. I. Onset of Plasma Heating and Electron Acceleration
Zimovets, I. V.; Meshalkina, N. S.; Sharykin, I. N. +1 more
We present the study of the SOL2015-03-15 M1.2 flare, revealing acceleration of electrons and plasma heating in the sheared twisted magnetic structure at the polarity inversion line (PIL). The purpose is to make an analysis of nonthermal electron dynamics and plasma heating in the highly stressed magnetic loops interacting at the PIL by using X-ra…
Influence of Earth-directed Coronal Mass Ejections on the Sun’s Shadow Observed by the Tibet-III Air Shower Array
Zhang, Yi; Yang, Z.; Liu, C. +79 more
We examine the possible influence of Earth-directed coronal mass ejections (ECMEs) on the Sun’s shadow in the 3 TeV cosmic-ray intensity observed by the Tibet-III air shower (AS) array. We confirm a clear solar-cycle variation of the intensity deficit in the Sun’s shadow during ten years between 2000 and 2009. This solar-cycle variation is overall…
Tackling the Saturation of Oxygen: The Use of Phosphorus and Sulfur as Proxies within the Neutral Interstellar Medium of Star-forming Galaxies
Aloisi, A.; James, B.
The abundance of oxygen in galaxies is widely used in furthering our understanding of galaxy formation and evolution. Unfortunately, direct measurements of O/H in the neutral gas are extremely difficult to obtain, as the only O I line available within the Hubble Space Telescope (HST) UV wavelength range (1150-3200 Å) is often saturated. As such, p…
NGC 7793 P9: An Ultraluminous X-Ray Source Evolved from a Canonical Black Hole X-Ray Binary
Kong, Albert K. H.; Hu, Chin-Ping; Ng, C. -Y. +1 more
Transient ultraluminous X-ray sources (ULXs) provide an important link bridging transient low-mass X-ray binaries and ULXs. Here we report the first discovery of both a canonical sub-Eddington outburst and an ultraluminous super-Eddington outburst from an unusual transient ULX, NGC 7793 P9, with a variability factor higher than 103. Its…