Search Publications
Herschel and ALMA Observations of Massive SZE-selected Clusters
Hilton, Matt; Sifón, Cristóbal; Devlin, Mark J. +6 more
We present new Herschel observations of four massive, Sunyaev-Zel’dovich effect-selected clusters at 0.3≤slant z≤slant 1.1, two of which have also been observed with the Atacama Large Millimeter/submillimeter Array (ALMA). We detect 19 Herschel/Photoconductor Array Camera and Spectrometer (PACS) counterparts to spectroscopically confirmed cluster …
The Time Evolution of the HH 1 Jet Modeled as a Variable Outflow
Raga, A. C.; Castellanos-Ramírez, A.; Rodríguez-González, A.
The HH 1 jet is a chain of knots extending out to ∼20″ from the VLA 1 source of the HH 1/2 system. Four epochs of [S II] images obtained with the Hubble Space Telescope over a ∼20 yr period show that these knots have a time-evolving intensity as they travel away from the outflow source. We present an axisymmetric, gas-dynamic simulation of a two-s…
Stellar Mass and 3.4 µm M/L Ratio Evolution of Brightest Cluster Galaxies in COSMOS since z ∼ 1.0
Kartaltepe, Jeyhan S.; O'Dea, Christopher P.; Moustakas, John +3 more
We investigate the evolution of star formation rates (SFRs), stellar masses, and M/L 3.4 µm ratios of brightest cluster galaxies (BCGs) in the COSMOS survey since z ∼ 1 to determine the contribution of star formation to the growth-rate of BCG stellar mass over time. Through the spectral energy density (SED) fitting of the GALEX, C…
The Isophotal Structure of Star-forming Galaxies at 0.5 < z < 1.8 in CANDELS: Implications for the Evolution of Galaxy Structure
Barro, Guillermo; Hathi, Nimish P.; Koekemoer, Anton M. +15 more
We have measured the radial profiles of isophotal ellipticity (ɛ) and disky/boxy parameter A 4 out to radii of about three times the semimajor axes for ∼4600 star-forming galaxies (SFGs) between redshift 0.5 and 1.8 in the CANDELS/GOODS-S and UDS fields. Based on the average size-mass relation in each redshift bin, we divide our galaxie…
Polycyclic Aromatic Hydrocarbon Emission Toward the Galactic Bulge
Blommaert, J. A. D. L.; Peeters, E.; Cami, J. +1 more
We examine polycyclic aromatic hydrocarbon (PAH), dust, and atomic/molecular emission toward the Galactic bulge using Spitzer Space Telescope observations of four fields: C32, C35, OGLE, and NGC 6522. These fields are approximately centered on (l, b) = (0.°0, 1.°0), (0.°0, -1.°0), (0.°4, -2.°4), and (1.°0, -3.°8), respectively. Far-infrared photom…
Tracing the Origin of Moving Groups. I. The γ Leo Moving Group with High-resolution Spectra from the Subaru Telescope
Zhao, G.; Chen, Y. Q.; Zhao, J. K. +7 more
We present chemical abundances of 15 stars in the γ Leo moving group based on high-resolution spectra with the Subaru High Dispersion Spectrograph. The sample was picked up by applying wavelet transform to UVW velocity components of stars in the solar neighborhood. Both photometric and spectroscopic method have been used to determine the stellar p…
An Infrared Study of the Circumstellar Material Associated with the Carbon Star R Sculptoris
Lau, R. M.; Hankins, M. J.; Herter, T. L. +2 more
The asymptotic giant branch (AGB) star R Sculptoris (R Scl) is one of the most extensively studied stars on the AGB. R Scl is a carbon star with a massive circumstellar shell (M shell ∼ 7.3 × 10-3 M ⊙) that is thought to have been produced during a thermal pulse event ∼2200 years ago. To study the thermal dust emis…
Alumina Polymorphism in the Circumstellar Dust Shells of Asymptotic Giant Branch Stars
Sargent, Benjamin A.
Many emission features remain unidentified in the infrared spectra of asymptotic giant branch (AGB) stars. In particular, features at ∼11, 20, 28, and 32 µm have been noted in mid-infrared spectra of oxygen-rich AGB stars. Here, I present models of dust excess emission in 36 spectra of 24 AGB stars from the Short Wavelength Spectrometer on b…
Discovery of Redshifted He-like Iron Absorption Line from Luminous Accreting Neutron Star SMC X-1
Odaka, Hirokazu; Tamagawa, Toru; Nakano, Toshio +1 more
We have analyzed X-ray data of SMC X-1 obtained with Suzaku and discovered the combination of an absorption line and an underlying broadened emission line centered at 6.4 keV in an observation performed on 2012 May 19. This absorption line is centered at {6.61}-0.03+0.02 {keV} with an absorption strength of {5.9}-1.4
The Carnegie-Chicago Hubble Program: Calibration of the Near-infrared RR Lyrae Period-Luminosity Relation with HST
Kollmeier, Juna A.; Madore, Barry F.; Freedman, Wendy L. +12 more
We present photometry of 30 Galactic RR Lyrae variables taken with HST WFC3/IR for the Carnegie-Chicago Hubble Program. These measurements form the base of the distance-ladder measurements that comprise a pure Population II base to a measurement of H o at an accuracy of 3%. These data are taken with the same instrument and filter (F16…