Search Publications
Kinematic Downsizing at z ∼ 2
Barro, Guillermo; Trump, Jonathan R.; Weiner, Benjamin J. +8 more
We present results from a survey of the internal kinematics of 49 star-forming galaxies at z∼ 2 in the CANDELS fields with the Keck/MOSFIRE spectrograph, Survey in the near-Infrared of Galaxies with Multiple position Angles (SIGMA). Kinematics (rotation velocity V rot and gas velocity dispersion {σ }g) are measured from nebul…
Star Formation Suppression Due to Jet Feedback in Radio Galaxies with Shocked Warm Molecular Gas
Alatalo, Katherine; Lanz, Lauranne; Ogle, Patrick M. +1 more
We present Herschel observations of 22 radio galaxies, selected for the presence of shocked, warm molecular hydrogen emission. We measured and modeled spectral energy distributions in 33 bands from the ultraviolet to the far-infrared to investigate the impact of jet feedback on star formation activity. These galaxies are massive, early-type galaxi…
The Complete Ultraviolet Spectrum of the Archetypal "Wind-dominated" Quasar Mrk 231: Absorption and Emission from a High-speed Dusty Nuclear Outflow
Veilleux, S.; Rupke, D. S. N.; Hamann, F. +2 more
New near- and far-ultraviolet (NUV and FUV) Hubble Space Telescope spectra of Mrk 231, the nearest quasar known, are combined with ground-based optical spectra to study the remarkable dichotomy between the FUV and NUV-optical spectral regions in this object. The FUV emission-line features are faint, broad, and highly blueshifted (up to ∼7000 km s<…
Observation of a Quasiperiodic Pulsation in Hard X-Ray, Radio, and Extreme-ultraviolet Wavelengths
Kumar, Pankaj; Cho, Kyung-Suk; Nakariakov, Valery M.
We present a multiwavelength analysis of a quasiperiodic pulsation (QPP) observed in the hard X-ray (HXR), radio, and extreme-ultraviolet (EUV) channels during an M1.9 flare that occurred on 2011 September 23-24. The nonthermal HXR emission in 25-50 keV observed by RHESSI shows five distinct impulsive peaks of decaying amplitude with a period of a…
The Search for Molecular Outflows in Local Volume AGNs with Herschel-PACS
Sturm, E.; Veilleux, S.; González-Alfonso, E. +3 more
We present the results from a systematic search for galactic-scale, molecular (OH 119 µm) outflows in a sample of 52 Local Volume (d\lt 50 Mpc) Burst Alert Telescope detected active galactic nuclei (BAT AGNs) with Herschel-PACS. We combine the results from our analysis of the BAT AGNs with the published Herschel/PACS data of 43 nearby (z\lt …
Cloud Structure of Galactic OB Cluster-forming Regions from Combining Ground- and Space-based Bolometric Observations
Li, Di; Qian, Lei; Rosolowsky, Erik +13 more
We have developed an iterative procedure to systematically combine the millimeter and submillimeter images of OB cluster-forming molecular clouds, which were taken by ground-based (CSO, JCMT, APEX, and IRAM-30 m) and space telescopes (Herschel and Planck). For the seven luminous (L\gt {10}6 L ⊙) Galactic OB cluster-forming mo…
Caught in the Act: Gas and Stellar Velocity Dispersions in a Fast Quenching Compact Star-Forming Galaxy at z~1.7
Finkelstein, Steven L.; Barro, Guillermo; Pérez-González, Pablo G. +20 more
We present Keck I MOSFIRE spectroscopy in the Y and H bands of GDN-8231, a massive, compact, star-forming galaxy at a redshift of z ∼ 1.7. Its spectrum reveals both Hα and [N II] emission lines and strong Balmer absorption lines. The Hα and Spitzer MIPS 24 µm fluxes are both weak, thus indicating a low star-formation rate of SFR ≲ 5{--}10 {M…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. VII. Implications from the Nearly Universal Nature of Horizontal Branch Discontinuities
Dalessandro, E.; Salaris, M.; Anderson, J. +14 more
The UV-initiative Hubble Space Telescope Treasury survey of Galactic globular clusters provides a new window into the phenomena that shape the morphological features of the horizontal branch (HB). Using this large and homogeneous catalog of UV and blue photometry, we demonstrate that the HB exhibits discontinuities that are remarkably consistent i…
Surface Albedo and Spectral Variability of Ceres
Nathues, Andreas; Schröder, Stefan E.; Russell, Christopher T. +21 more
Previous observations suggested that Ceres has active, but possibly sporadic, water outgassing as well as possibly varying spectral characteristics over a timescale of months. We used all available data of Ceres collected in the past three decades from the ground and the Hubble Space Telescope, as well as the newly acquired images by the Dawn Fra…
Constraining the Properties of Dark Matter with Observations of the Cosmic Microwave Background
Kopp, Michael; Skordis, Constantinos; Thomas, Daniel B.
We examine how the properties of dark matter, parameterized by an equation-of-state parameter w and two perturbative generalized dark matter (GDM) parameters, c 2 s (the sound speed) and {c}{vis}2 (the viscosity), are constrained by existing cosmological data, particularly the Planck 2015 data release.…