Search Publications
Ultraviolet Observations of the Globular Cluster M10 from HST and GALEX: The BSS Population
O'Connell, R. W.; Dalessandro, E.; Beccari, G. +3 more
We present a combination of high-resolution Hubble Space Telescope and wide-field ground-based and Galaxy Evolution Explorer data of the Galactic globular cluster M10 (NGC 6254). By using this large data set, we determined the center of gravity of the cluster and we built its density profile from star counts over its entire radial extension. We fi…
Asymmetries in Coronal Spectral Lines and Emission Measure Distribution
Tripathi, Durgesh; Klimchuk, James A.
It has previously been argued that (1) spicules do not provide enough pre-heated plasma to fill the corona, and (2) even if they did, additional heating would be required to keep the plasma hot as it expands upward. Here we address whether spicules play an important role by injecting plasma at cooler temperatures (<2 MK), which then gets heated…
Constraining Stellar Feedback: Shock-ionized Gas in Nearby Starburst Galaxies
Martin, Crystal L.; Conselice, Christopher J.; Calzetti, Daniela +3 more
We investigate the properties of feedback-driven shocks in eight nearby starburst galaxies using narrow-band imaging data from the Hubble Space Telescope. We identify the shock-ionized component via the line diagnostic diagram [O III] (λ5007)/Hβ versus [S II] (λλ6716, 6731) (or [N II] (λ6583))/Hα, applied to resolved regions 3-15 pc in size. We di…
Cr-K Emission Line as a Constraint on the Progenitor Properties of Supernova Remnants
Li, Aigen; Tsunemi, H.; Lu, F. J. +4 more
We perform a survey of the Cr, Mn, and Fe-K emission lines in young supernova remnants (SNRs) with the Japanese X-ray astronomy satellite Suzaku. The Cr and/or Mn emission lines are detected in 3C 397 and 0519-69.0 for the first time. We also confirm the detection of these lines in Kepler, W49B, N103B, and Cas A. We derive the line parameters (i.e…
A Bayesian Method for the Analysis of the Dust Emission in the Far-infrared and Submillimeter
Paladini, R.; Piacentini, F.; Noriega-Crespo, A. +3 more
We present a method, based on Bayesian statistics, to fit the dust emission parameters in the far-infrared and submillimeter wavelengths. The method estimates the dust temperature and spectral emissivity index, plus their relationship, properly taking into account the statistical and systematic uncertainties. We test it on three sets of simulated …
Dual Halos and Formation of Early-type Galaxies
Lee, Myung Gyoon; Park, Hong Soo
We present a determination of the two-dimensional shape parameters of the blue and red globular cluster systems (GCSs) in a large number of elliptical galaxies and lenticular galaxies (early-type galaxies, called ETGs). We use a homogeneous data set of the globular clusters in 23 ETGs obtained from the HST/ACS Virgo Cluster Survey. The position an…
Investigating the Presence of 500 µm Submillimeter Excess Emission in Local Star Forming Galaxies
Kirkpatrick, Allison; Calzetti, Daniela; Walter, Fabian +10 more
Submillimeter excess emission has been reported at 500 µm in a handful of local galaxies, and previous studies suggest that it could be correlated with metal abundance. We investigate the presence of an excess submillimeter emission at 500 µm for a sample of 20 galaxies from the Key Insights on Nearby Galaxies: a Far Infrared Survey wi…
Metal-mass-to-light Ratios of the Perseus Cluster Out to the Virial Radius
Simionescu, A.; Matsushita, K.; Sato, K. +2 more
We analyzed XMM-Newton data of the Perseus cluster out to ~1 Mpc, or approximately half the virial radius. Using the flux ratios of Lyα lines of H-like Si and S to Kα line of He-like Fe, the abundance ratios of Si/Fe and S/Fe of the intracluster medium (ICM) were derived using the APEC plasma code v2.0.1. The temperature dependence of the line rat…
Distance and Proper Motion Measurement of the Red Supergiant, PZ Cas, in Very Long Baseline Interferometry H2O Maser Astrometry
Asaki, Y.; Imai, H.; Oyama, T. +1 more
We present the very long baseline interferometry H2O maser monitoring observations of the red supergiant, PZ Cas, at 12 epochs from 2006 April to 2008 May. We fitted maser motions to a simple model composed of a common annual parallax and linear motions of the individual masers. The maser motions with the parallax subtracted were well m…
Intragroup and Galaxy-linked Diffuse X-Ray Emission in Hickson Compact Groups
Charlton, Jane C.; Brandt, William N.; Zabludoff, Ann I. +9 more
Isolated compact groups (CGs) of galaxies present a range of dynamical states, group velocity dispersions, and galaxy morphologies with which to study galaxy evolution, particularly the properties of gas both within the galaxies and in the intragroup medium. As part of a large, multiwavelength examination of CGs, we present an archival study of di…