Search Publications
A Study of X-Ray Emission of Galaxies Hosting Molecular Outflows (MOX Sample)
Gandhi, Poshak; Ricci, Claudio; Guainazzi, Matteo +5 more
We have carried out an extensive X-ray spectral analysis of a sample of galaxies exhibiting molecular outflows (MOX sample) to characterize the X-ray properties and investigate the effect of active galactic nuclei (AGNs) on the dynamical properties of the molecular outflows (MOs). We find that the X-ray bolometric correction (L 2-10 keV…
The Initial Mass Function in the Coma Berenices Dwarf Galaxy from Deep Near-infrared HST Observations
Brown, Thomas M.; Gennaro, Mario; Conroy, Charlie +6 more
We use deep Hubble Space Telescope (HST) WFC3/IR imaging to study the initial mass function (IMF) of the ultra-faint dwarf galaxy Coma Berenices (Com Ber). Our observations reach the lowest stellar mass ever probed in a resolved galaxy, with 50% completeness at ∼0.17 M ⊙. Unresolved background galaxies, however, limit our purity below ∼…
A Thorough View of the Nuclear Region of NGC 253: Combined Herschel, SOFIA, and APEX Data Set
Menten, K. M.; Güsten, R.; Requena-Torres, M. A. +5 more
We present a large set of spectral lines detected in the 40″ central region of the starburst galaxy NGC 253. Observations were obtained with the three instruments SPIRE, PACS, and HIFI on board the Herschel Space Observatory, upGREAT on board the SOFIA airborne observatory, and the ground-based Atacama Pathfinder EXperiment telescope. Combining th…
Chemo-kinematic Ages of Eccentric-planet-hosting M Dwarf Stars
Muirhead, Philip S.; Veyette, Mark J.
The M dwarf stars are exciting targets for exoplanet investigations; however, their fundamental stellar properties are difficult to measure. Perhaps the most challenging property is stellar age. Once on the main sequence, M dwarfs change imperceptibly in their temperature and luminosity, necessitating novel statistical techniques for estimating th…
Photospheric and Coronal Abundances in an X8.3 Class Limb Flare
Culhane, J. L.; Doschek, G. A.; Warren, H. P. +3 more
We analyze solar elemental abundances in coronal post-flare loops of an X8.3 flare (SOL2017-09-10T16:06) observed on the west limb on 2017 September 10 near 18 UT using spectra recorded by the Extreme-ultraviolet Imaging Spectrometer (EIS) on the Hinode spacecraft. The abundances in the corona can differ from photospheric abundances due to the fir…
Galaxy Structure in the Ultraviolet: The Dependence of Morphological Parameters on Rest-frame Wavelength
Conselice, Christopher J.; Madore, Barry F.; Windhorst, Rogier A. +5 more
Evolutionary studies that compare galaxy structure as a function of redshift are complicated by the fact that any particular galaxy’s appearance depends in part on the rest-frame wavelength of the observation. This leads to the necessity for a “morphological k-correction” between different passbands, especially when comparing the rest-frame optica…
The MOSDEF Survey: The Nature of Mid-infrared Excess Galaxies and a Comparison of IR and UV Star Formation Tracers at z ∼ 2
Siana, Brian; Azadi, Mojegan; Coil, Alison +11 more
We present an analysis using the MOSFIRE Deep Evolution Field (MOSDEF) survey on the nature of “MIR-excess” galaxies, which have star formation rates (SFRs) inferred from mid-infrared (MIR) data that are substantially elevated relative to those estimated from dust-corrected UV data. We use a sample of ∼200 galaxies and active galactic nuclei (AGNs…
The Spectral and Environment Properties of z ∼ 2.0-2.5 Quasar Pairs
Hennawi, Joseph F.; Rafelski, Marc; Neeleman, Marcel +5 more
We present the first results from our survey of intervening and proximate Lyman limit systems (LLSs) at z ∼ 2.0-2.5 using the Wide Field Camera 3 on board the Hubble Space Telescope. The quasars in our sample are projected pairs with proper transverse separations R ⊥ ≤ 150 kpc and line-of-sight velocity separations ≲11,000 km s-1
A Study of a Compound Solar Eruption with Two Consecutive Erupting Magnetic Structures
Chintzoglou, Georgios; Zhang, Jie; Dhakal, Suman K.
We report a study of a compound solar eruption that was associated with two consecutively erupting magnetic structures and correspondingly two distinct peaks, during impulsive phase, of an M-class flare (M8.5). Simultaneous multi-viewpoint observations from SDO, GOES and STEREO-A show that this compound eruption originated from two pre-existing si…
K 2 Ultracool Dwarfs Survey. IV. Monster Flares Observed on the Young Brown Dwarf CFHT-BD-Tau 4
Mullan, D. J.; Burgasser, Adam J.; Gizis, John E. +4 more
We present photometric measurements of two superflares observed on a very young brown dwarf, CFHT-BD-Tau 4, observed during Campaign 13 of the Kepler K 2 mission. The stronger of the two superflares brightened by a factor of ∼48 relative to the quiescent photospheric level, with an increase in Kepler magnitude {{Δ }}\tilde{{K}p}=-4.20. …