Search Publications
Reconstruction of Galaxy Star Formation Histories through SED Fitting:The Dense Basis Approach
Gawiser, Eric; Iyer, Kartheik
We introduce the dense basis method for Spectral Energy Distribution (SED) fitting. It accurately recovers traditional SED parameters, including M *, SFR, and dust attenuation, and reveals previously inaccessible information about the number and duration of star formation episodes and the timing of stellar mass assembly, as well as unce…
Lessons from the Onset of a Common Envelope Episode: the Remarkable M31 2015 Luminous Red Nova Outburst
Ramirez-Ruiz, Enrico; MacLeod, Morgan; Grindlay, Jonathan +3 more
This paper investigates the recent stellar-merger transient M31LRN 2015 in the Andromeda galaxy. We analyze published optical photometry and spectroscopy along with a Hubble Space Telescope detection of the color and magnitude of the pre-outburst source. The transient outburst is consistent with dynamically driven ejecta at the onset of a common e…
The Fraction of Cool-core Clusters in X-Ray versus SZ Samples Using Chandra Observations
Lovisari, Lorenzo; Andrade-Santos, Felipe; Jones, Christine +21 more
We derive and compare the fractions of cool-core clusters in the Planck Early Sunyaev-Zel’dovich sample of 164 clusters with z≤slant 0.35 and in a flux-limited X-ray sample of 100 clusters with z≤slant 0.30, using Chandra observations. We use four metrics to identify cool-core clusters: (1) the concentration parameter, which is the ratio of the in…
Dense Molecular Gas Tracers in the Outflow of the Starburst Galaxy NGC 253
Meier, David S.; Ott, Jürgen; Warren, Steven R. +12 more
We present a detailed study of a molecular outflow feature in the nearby starburst galaxy NGC 253 using ALMA. We find that this feature is clearly associated with the edge of NGC 253's prominent ionized outflow, has a projected length of ∼300 pc, with a width of ∼50 pc, and a velocity dispersion of ∼40 km s-1, which is consistent with a…
An ALMA Survey of DCN/H13CN and DCO+/H13CO+ in Protoplanetary Disks
Wilner, David J.; Aikawa, Yuri; Andrews, Sean M. +7 more
The deuterium enrichment of molecules is sensitive to their formation environment. Constraining patterns of deuterium chemistry in protoplanetary disks is therefore useful for probing how material is inherited or reprocessed throughout the stages of star and planet formation. We present ALMA observations at ∼0.″6 resolution of DCO+, H
X-ray and Ultraviolet Properties of AGNs in Nearby Dwarf Galaxies
Greene, Jenny E.; Baldassare, Vivienne F.; Reines, Amy E. +1 more
We present new Chandra X-ray Observatory and Hubble Space Telescope observations of eight optically selected broad-line active galactic nucleus (AGN) candidates in nearby dwarf galaxies (z < 0.055). Including archival Chandra observations of three additional sources, our sample contains all 10 galaxies from Reines et al. (2013) with both broad …
ALMA Reveals Metals yet No Dust within Multiple Components in CR7
Schaerer, D.; Mobasher, B.; Ferrara, A. +8 more
We present spectroscopic follow-up observations of CR7 with ALMA, targeted at constraining the infrared (IR) continuum and [C II]{}158µ {{m}} line-emission at high spatial resolution matched to the HST/WFC3 imaging. CR7 is a luminous Lyα emitting galaxy at z = 6.6 that consists of three separated UV-continuum components. Our obser…
Bombs and Flares at the Surface and Lower Atmosphere of the Sun
Leenaarts, J.; Hansteen, V. H.; Rouppe van der Voort, L. +3 more
A spectacular manifestation of solar activity is the appearance of transient brightenings in the far wings of the Hα line, known as Ellerman bombs (EBs). Recent observations obtained by the Interface Region Imaging Spectrograph have revealed another type of plasma “bombs” (UV bursts) with high temperatures of perhaps up to 8 × 104 K wit…
Falling Outer Rotation Curves of Star-forming Galaxies at 0.6 ≲ z ≲ 2.6 Probed with KMOS3D and SINS/zC-SINF
Übler, Hannah; van Dokkum, Pieter G.; Brammer, Gabe +25 more
We exploit the deep, resolved, Hα kinematic data from the KMOS3D and SINS/zC-SINF surveys to examine the largely unexplored outer-disk kinematics of star-forming galaxies (SFGs), out to the peak of cosmic star formation. Our sample contains 101 SFGs, representative of the more massive (9.3≲ {log}{M}* /{M}⊙ ≲ 11.5) …
A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data
Ade, P. A. R.; Baccigalupi, C.; Borrill, J. +79 more
We report an improved measurement of the cosmic microwave background B-mode polarization power spectrum with the Polarbear experiment at 150 GHz. By adding new data collected during the second season of observations (2013-2014) to re-analyzed data from the first season (2012-2013), we have reduced twofold the band-power uncertainties. The band pow…