Search Publications
Buried AGNs in Advanced Mergers: Mid-infrared Color Selection as a Dual AGN Candidate Finder
Ellison, Sara L.; Ricci, Claudio; Blecha, Laura +7 more
A direct consequence of hierarchical galaxy formation is the existence of dual supermassive black holes, which may be preferentially triggered as active galactic nuclei (AGNs) during galaxy mergers. Despite decades of searching, however, dual AGNs are extremely rare, and most have been discovered serendipitously. Using the all-sky WISE survey, we …
Intermittent Reconnection and Plasmoids in UV Bursts in the Low Solar Atmosphere
De Pontieu, B.; Martínez-Sykora, J.; Hansteen, V. H. +9 more
Magnetic reconnection is thought to drive a wide variety of dynamic phenomena in the solar atmosphere. Yet, the detailed physical mechanisms driving reconnection are difficult to discern in the remote sensing observations that are used to study the solar atmosphere. In this Letter, we exploit the high-resolution instruments Interface Region Imagin…
Rotating Starburst Cores in Massive Galaxies at z = 2.5
Übler, Hannah; Tamura, Yoichi; Kohno, Kotaro +21 more
We present spatially resolved ALMA observations of the CO J=3-2 emission line in two massive galaxies at z = 2.5 on the star-forming main sequence. Both galaxies have compact dusty star-forming cores with effective radii of {R}{{e}}=1.3+/- 0.1 {kpc} and {R}{{e}}=1.2+/- 0.1 {kpc} in the 870 µm continuum emission. The spa…
A Submillimeter Perspective on the GOODS Fields (SUPER GOODS). I. An Ultradeep SCUBA-2 Survey of the GOODS-N
Wang, W. -H.; Owen, F. N.; Barger, A. J. +3 more
In this first paper in the SUPER GOODS series on powerfully star-forming galaxies in the two GOODS fields, we present a deep SCUBA-2 survey of the GOODS-N at both 850 and 450 µm (central rms noise of 0.28 mJy and 2.6 mJy, respectively). In the central region, the 850 µm observations cover the GOODS-N to near the confusion limit of ∼1.6…
Coherent Structures at Ion Scales in Fast Solar Wind: Cluster Observations
Maksimovic, M.; Alexandrova, O.; Lion, S. +5 more
We investigate the nature of magnetic turbulent fluctuations, around ion characteristic scales, in a fast solar wind stream, by using Cluster data. Contrarily to slow solar wind, where both Alfvénic (δ {b}\perp \gg δ {b}\parallel ) and compressive (δ {b}\parallel \gg δ {b}\perp ) coherent structures are …
NGC 1866: First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster
Mateo, M.; Crane, J. D.; Milone, A. P. +6 more
High-resolution spectroscopic observations were taken of 29 extended main-sequence turnoff (eMSTO) stars in the young (∼200 Myr) Large Magellanic Cloud (LMC) cluster, NGC 1866, using the Michigan/Magellan Fiber System and MSpec spectrograph on the Magellan-Clay 6.5 m telescope. These spectra reveal the first direct detection of rapidly rotating st…
On the Early-time Excess Emission in Hydrogen-poor Superluminous Supernovae
Filippenko, Alexei V.; Cenko, S. Bradley; Sollerman, Jesper +27 more
We present the light curves of the hydrogen-poor superluminous supernovae (SLSNe I) PTF 12dam and iPTF 13dcc, discovered by the (intermediate) Palomar Transient Factory. Both show excess emission at early times and a slowly declining light curve at late times. The early bump in PTF 12dam is very similar in duration (∼10 days) and brightness relati…
An Ultraviolet Excess in the Superluminous Supernova Gaia16apd Reveals a Powerful Central Engine
Berger, E.; Challis, P.; Chornock, R. +5 more
Since the discovery of superluminous supernovae (SLSNe) in the last decade, it has been known that these events exhibit bluer spectral energy distributions than other supernova subtypes, with significant output in the ultraviolet. However, the event Gaia16apd seems to outshine even the other SLSNe at rest-frame wavelengths below ∼3000 Å. Yan et al…
A Comprehensive Study of Lyα Emission in the High-redshift Galaxy Population
Blanc, Guillermo A.; Oyarzún, Grecco A.; Mateo, Mario +2 more
We present an exhaustive census of Lyman alpha (Lyα) emission in the general galaxy population at 3< z< 4.6. We use the Michigan/Magellan Fiber System (M2FS) spectrograph to study a stellar mass (M {}* ) selected sample of 625 galaxies homogeneously distributed in the range 7.6< {log} {M}* /{M}⊙ < 10.6.…
Two New Calcium-rich Gap Transients in Group and Cluster Environments
Gal-Yam, A.; Kulkarni, S. R.; Filippenko, A. V. +20 more
We present the Palomar Transient Factory discoveries and the photometric and spectroscopic observations of PTF11kmb and PTF12bho. We show that both transients have properties consistent with the class of calcium-rich gap transients, specifically lower peak luminosities and rapid evolution compared to ordinary supernovae, and a nebular spectrum dom…