Search Publications
Sizing up Partially Depleted Galaxy Cores
Graham, Alister W.; Dullo, Bililign T.
We have modeled the inner surface brightness profiles of 39 alleged "core" galaxies with the core-Sérsic model, and provide new physical parameters for the largest ever sample of "core" galaxies fit with this model. When present, additional nuclear components were simultaneously modeled and the typical root-mean-square scatter of the fits (out to …
Dust-to-gas Ratio in the Extremely Metal-poor Galaxy I Zw 18
Cannon, John M.; Bolatto, Alberto D.; Leroy, Adam K. +7 more
The blue compact dwarf galaxy I Zw 18 is one of the most metal-poor systems known in the local universe (12+log(O/H) = 7.17). In this work we study I Zw 18 using data from Spitzer, Herschel Space Telescope, and IRAM Plateau de Bure Interferometer. Our data set includes the most sensitive maps of I Zw 18, to date, in both the far-infrared and the C…
Dark Matter Search Using XMM-Newton Observations of Willman 1
Loewenstein, Michael; Kusenko, Alexander
We report the results of a search for an emission line from radiatively decaying dark matter in the ultra-faint dwarf spheroidal galaxy Willman 1 based on analysis of spectra extracted from XMM-Newton X-ray Observatory data. The observation follows up our analysis of Chandra data of Willman 1 that resulted in line flux upper limits over the Chandr…
The Chandra View of NGC 4178: The Lowest Mass Black Hole in a Bulgeless Disk Galaxy?
Cheung, C. C.; Böker, T.; Secrest, N. J. +3 more
Using high-resolution Chandra data, we report the presence of a weak X-ray point source coincident with the nucleus of NGC 4178, a late-type bulgeless disk galaxy known to have high-ionization mid-infrared (mid-IR) lines typically associated with active galactic nuclei (AGNs). Although the faintness of this source precludes a direct spectral analy…
Evidence for a Wide Range of Ultraviolet Obscuration in z ~ 2 Dusty Galaxies from the GOODS-Herschel Survey
Dickinson, Mark; Daddi, Emanuele; Dey, Arjun +20 more
Dusty galaxies at z ~ 2 span a wide range of relative brightness between rest-frame mid-infrared (8 µm) and ultraviolet wavelengths. We attempt to determine the physical mechanism responsible for this diversity. Dust-obscured galaxies (DOGs), which have rest-frame mid-IR to UV flux density ratios >~ 1000, might be abnormally bright in the…
A Multi-wavelength Investigation of RCW175: An H II Region Harboring Spinning Dust Emission
Alves, M. I. R.; Davies, R. D.; Davis, R. J. +13 more
Using infrared, radio continuum, and spectral observations, we performed a detailed investigation of the H II region RCW175. We determined that RCW175, which actually consists of two separate H II regions, G29.1-0.7 and G29.0-0.6, is located at a distance of 3.2 ± 0.2 kpc. Based on the observations we infer that the more compact G29.0-0.6 is less …
A Broadband Study of the Emission from the Composite Supernova Remnant MSH 11-62
Gelfand, Joseph D.; Temim, Tea; Hughes, John P. +10 more
MSH 11-62 (G291.0-0.1) is a composite supernova remnant for which radio and X-ray observations have identified the remnant shell as well as its central pulsar wind nebula. The observations suggest a relatively young system expanding into a low-density region. Here, we present a study of MSH 11-62 using observations with the Chandra, XMM -Newton, a…
Moderate-luminosity Growing Black Holes from 1.25 < z < 2.7: Varied Accretion in Disk-dominated Hosts
Urry, C. M.; Simmons, B. D.; Schawinski, K. +2 more
We compute black hole masses and bolometric luminosities for 57 active galactic nuclei (AGNs) in the redshift range 1.25 <= z <= 2.67, selected from the GOODS-South deep multi-wavelength survey field via their X-ray emission. We determine host galaxy morphological parameters by separating the galaxies from their central point sources in deep…
The Evolution of the Rest-frame V-band Luminosity Function from z = 4: A Constant Faint-end Slope over the Last 12 Gyr of Cosmic History
Marchesini, Danilo; Stefanon, Mauro; Whitaker, Katherine E. +1 more
We present the rest-frame V-band luminosity function (LF) of galaxies at 0.4 <= z < 4.0, measured from a near-infrared selected sample constructed from the NMBS, the FIRES, the FIREWORKS, and the ultra-deep NICMOS and WFC3 observations in the HDFN, HUDF, and GOODS-CDFS, all having high-quality optical-to-mid-infrared data. This unique sample…
Evolution and Hydrodynamics of the Very Broad X-Ray Line Emission in SN 1987A
Haberl, F.; Sturm, R.; Dwarkadas, V. V. +2 more
Observations of SN 1987A by the Chandra High Energy Transmission Grating (HETG) in 1999 and the XMM-Newton Reflection Grating Spectrometer (RGS) in 2003 show very broad (v-b) lines with a full width at half-maximum (FWHM) of order 104 km s-1 at these times the blast wave (BW) was primarily interacting with the H II region aro…