Search Publications
The PAH Emission Characteristics of the Reflection Nebula NGC 2023
Wolfire, Mark G.; Peeters, Els; Tielens, Alexander G. G. M. +3 more
We present 5-20 µm spectral maps of the reflection nebula NGC 2023 obtained with the Infrared Spectrograph SL and SH modes on board the Spitzer Space Telescope, which reveal emission from polycyclic aromatic hydrocarbons (PAHs), C60, and H2 superposed on a dust continuum. We show that several PAH emission bands correlat…
Detection of Supermassive Black Holes in Two Virgo Ultracompact Dwarf Galaxies
Romanowsky, Aaron J.; Neumayer, Nadine; Strader, Jay +13 more
We present the detection of supermassive black holes (BHs) in two Virgo ultracompact dwarf galaxies (UCDs), VUCD3 and M59cO. We use adaptive optics assisted data from the Gemini/NIFS instrument to derive radial velocity dispersion profiles for both objects. Mass models for the two UCDs are created using multi-band Hubble Space Telescope imaging, i…
A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2.12 Submillimeter Galaxy ALESS67.1
Ivison, R. J.; Smail, Ian; Brandt, W. N. +17 more
We present detailed studies of a z = 2.12 submillimeter galaxy, ALESS67.1, using sub-arcsecond resolution ALMA, adaptive optics-aided VLT/SINFONI, and Hubble Space Telescope (HST)/CANDELS data to investigate the kinematics and spatial distributions of dust emission (870 µm continuum), 12CO(J = 3-2), strong optical emission lines, …
Effective Radii of Young, Massive Star Clusters in Two LEGUS Galaxies
Cignoni, M.; Gallagher, J. S.; Dale, D. A. +15 more
We present a study of the effective (half-light) radii and other structural properties of a systematically selected sample of young, massive star clusters (≥5 × 103 {M}⊙ and ≤200 Myr) in two nearby spiral galaxies, NGC 628 and NGC 1313. We use Hubble Space Telescope (HST) WFC3/UVIS and archival ACS/WFC data obtained by the L…
Rise of the Titans: A Dusty, Hyper-luminous “870 µm Riser” Galaxy at z ∼ 6
Marques-Chaves, Rui; Oliver, Seb; Cooray, Asantha +12 more
We report the detection of ADFS-27, a dusty, starbursting major merger at a redshift of z = 5.655, using the Atacama Large Millimeter/submillimeter Array (ALMA). ADFS-27 was selected from Herschel/Spectral and Photometric Imaging Receiver (SPIRE) and APEX/LABOCA data as an extremely red “870 µm riser” (I.e., {S}250µ {{m}}<…
Rotation of Late-type Stars in Praesepe with K2
Bouvier, J.; Hebb, L.; Rebull, L. M. +5 more
We have Fourier-analyzed 941 K2 light curves (LCs) of likely members of Praesepe, measuring periods for 86% and increasing the number of rotation periods (P) by nearly a factor of four. The distribution of P versus (V-{K}{{s}}), a mass proxy, has three different regimes: (V-{K}{{s}}) < 1.3, where the rotation rate rapidly …
Mapping the Nuclear Outflow of the Milky Way: Studying the Kinematics and Spatial Extent of the Northern Fermi Bubble
Jenkins, Edward B.; Hernandez, Svea; Savage, Blair D. +7 more
We report new observations from a systematic, spectroscopic, ultraviolet absorption-line survey that maps the spatial and kinematic properties of the high velocity gas in the Galactic Center (GC) region. We examine the hypothesis that this gas traces the biconical nuclear outflow. We use an ultraviolet spectra of 47 background QSOs and halo stars …
Statistical Analysis of Hubble/WFC3 Transit Spectroscopy of Extrasolar Planets
Deming, Drake; Madhusudhan, Nikku; Knutson, Heather +3 more
Transmission spectroscopy provides a window to study exoplanetary atmospheres, but that window is fogged by clouds and hazes. Clouds and haze introduce a degeneracy between the strength of gaseous absorption features and planetary physical parameters such as abundances. One way to break that degeneracy is via statistical studies. We collect all pu…
Black Hole Growth Is Mainly Linked to Host-galaxy Stellar Mass Rather Than Star Formation Rate
Lehmer, B. D.; Alexander, D. M.; Bauer, F. E. +14 more
We investigate the dependence of black hole accretion rate (BHAR) on host-galaxy star formation rate (SFR) and stellar mass (M *) in the CANDELS/GOODS-South field in the redshift range of 0.5≤slant z< 2.0. Our sample consists of ≈ {{18,000}} galaxies, allowing us to probe galaxies with 0.1{M}⊙ {{yr}}-1≲ {SFR}≲ 1…
Distance and Properties of NGC 4993 as the Host Galaxy of the Gravitational-wave Source GW170817
Lee, Chung-Uk; Kim, Seung-Lee; Im, Myungshin +9 more
Recently, the optical counterpart of the gravitational-wave source GW170817 has been identified in the NGC 4993 galaxy. Together with evidence from observations in electromagnetic waves, the event has been suggested as a result of a merger of two neutron stars (NSs). We analyze the multi-wavelength data to characterize the host galaxy property and…