Search Publications
The SXDF-ALMA 2-arcmin2 Deep Survey: Stacking Rest-frame Near-infrared Selected Objects
Tamura, Yoichi; Kohno, Kotaro; Caputi, Karina I. +24 more
We present stacking analyses on our ALMA deep 1.1 mm imaging in the Subaru/XMM-Newton Deep Survey Field using 1.6 and 3.6 µm selected galaxies in the CANDELS WFC3 catalog. We detect a stacked flux of ∼0.03-0.05 mJy, corresponding to {L}{IR}\lt {10}11 {L}⊙ and a star formation rate (SFR) of ∼ 15 {M}⊙
Young Stellar Populations in MYStIX Star-forming Regions: Candidate Protostars
Feigelson, Eric D.; Povich, Matthew S.; Getman, Konstantin V. +2 more
The Massive Young Star-Forming Complex in Infrared and X-ray (MYStIX) project provides a new census on stellar members of massive star-forming regions within 4 kpc. Here the MYStIX Infrared Excess catalog and Chandra-based X-ray photometric catalogs are mined to obtain high-quality samples of Class I protostars using criteria designed to reduce ex…
Are There Two Distinct Solar Energetic Particle Releases in the 2012 May 17 Ground Level Enhancement Event?
Li, Gang; Ding, Liu-Guan; Jiang, Yong
We examine ion release times in the solar vicinity for the 2012 May 17 Ground Level Enhancement event using the velocity dispersion analysis method. In situ energetic proton data from Solar and Heliospheric Observatory (SOHO)/Energetic and Relativistic Nuclei and Electron and Geostationary Operational Environmental Satellite are used. We find two …
An Apparent Precessing Helical Outflow from a Massive Evolved Star: Evidence for Binary Interaction
Morris, M. R.; Mills, E. A. C.; Ressler, M. E. +3 more
Massive, evolved stars play a crucial role in the metal enrichment, dust budget, and energetics of the interstellar medium; however, the details of their evolution are uncertain because of their rarity and short lifetimes before exploding as supernovae. Discrepancies between theoretical predictions from single-star evolutionary models and observat…
The Metallicity Evolution of Blue Compact Dwarf Galaxies from the Intermediate Redshift to the Local Universe
Fang, Guanwen; Kong, Xu; Lian, Jianhui +2 more
We present oxygen abundance measurements for 74 blue compact dwarf (BCD) galaxies in the redshift range of [0.2, 0.5] using the strong-line method. The spectra of these objects are taken using Hectospec on the Multiple Mirror Telescope. More than half of these BCDs had dust attenuation corrected using the Balmer decrement method. For comparison, w…
X-Ray Sources in the Dwarf Spheroidal Galaxy Draco
Sonbas, E.; Dhuga, K. S.; Kargaltsev, O. +3 more
We present the spectral analysis of an 87 ks XMM-Newton observation of Draco, a nearby dwarf spheroidal galaxy. Of the approximately 35 robust X-ray source detections, we focus our attention on the brightest of these sources, for which we report X-ray and multiwavelength parameters. While most of the sources exhibit properties consistent with acti…
Systematic Uncertainties in the Spectroscopic Measurements of Neutron-star Masses and Radii from Thermonuclear X-Ray Bursts. III. Absolute Flux Calibration
Marshall, Herman; Güver, Tolga; Özel, Feryal +3 more
Many techniques for measuring neutron star radii rely on absolute flux measurements in the X-rays. As a result, one of the fundamental uncertainties in these spectroscopic measurements arises from the absolute flux calibrations of the detectors being used. Using the stable X-ray burster, GS 1826-238, and its simultaneous observations by Chandra HE…
Spitzer IRAC Observations of IR Excess in Holmberg IX X-1: A Circumbinary Disk or a Variable Jet?
Roberts, T. P.; Berghea, C. T.; Dudik, R. P. +4 more
We present Spitzer Infrared Array Camera photometric observations of the ultraluminous X-ray source (ULX, X-1) in Holmberg IX. We construct a spectral energy distribution (SED) for Holmberg IX X-1 based on published optical, UV, and X-ray data combined with the IR data from this analysis. We modeled the X-ray and optical data with disk and stellar…
Foreground Bias from Parametric Models of Far-IR Dust Emission
Kogut, A.; Fixsen, D. J.
We use simple toy models of far-IR dust emission to estimate the accuracy to which the polarization of the cosmic microwave background can be recovered using multi-frequency fits, if the parametric form chosen for the fitted dust model differs from the actual dust emission. Commonly used approximations to the far-IR dust spectrum yield CMB residua…
After the Interaction: an Efficiently Star-forming Molecular Disk in NGC 5195
Aalto, Susanne; Nyland, Kristina; Gallagher, John S. +4 more
We present new molecular gas maps of NGC 5195 (alternatively known as M51b) from the Combined Array for Research in Millimeter Astronomy, including 12CO(1-0), 13CO(1-0), CN(1{}{0,2}-{0}{0,1}), CS(2-1), and 3 mm continuum. We also detected HCN(1-0) and HCO+(1-0) using the Onsala Space Observato…