Search Publications
Models of the Hydrodynamic Histories of Post-AGB Stars. I. Multiflow Shaping of OH 231.8+04.2
Frank, Adam; Balick, Bruce; Liu, Baowei +1 more
We present a detailed hydrodynamic model that matches the present structure of the well-observed preplanetary nebula (“pPN”) OH 231.8+04.2 (“OH231”). The purpose of the model is to present a physically justified and coherent picture of its evolutionary history from about 100 years from the start of the formation of its complex outer structures to …
Variable Stars in Local Group Galaxies. III. And VII, NGC 147, and NGC 185: Insight into the Building Blocks of the M31 Halo
Stetson, P. B.; Bono, G.; Fiorentino, G. +5 more
We present the discovery of 1568 RR Lyrae stars in three of the most luminous M31 satellites: And VII (573), NGC 147 (177), and NGC 185 (818). We use their properties to study the formation history of Local Group spiral haloes, and in particular, to infer about the nature of their possible building blocks by comparison with available data for RR L…
The Molecular Cloud S242: Physical Environment and Star-formation Activities
Dewangan, L. K.; Ojha, D. K.; Janardhan, P. +3 more
We present a multi-wavelength study to probe the star-formation (SF) processes on a larger scale (∼ 1\buildrel{\circ}\over{.} 05× 0\buildrel{\circ}\over{.} 56) around the S242 site. The S242 molecular cloud is depicted in a velocity range from -3.25 to 4.55 km s-1 and has a spatially elongated appearance. Based on the virial analysis, t…
ZFIRE: Similar Stellar Growth in Hα-emitting Cluster and Field Galaxies at z ~ 2
Papovich, Casey; Kewley, Lisa J.; Kacprzak, Glenn G. +13 more
We compare galaxy scaling relations as a function of environment at z∼ 2 with our ZFIRE survey12 where we have measured Hα fluxes for 90 star-forming galaxies selected from a mass-limited ({log}({M}\star /{M}⊙ )> 9) sample based on ZFOURGE.13 The cluster galaxies (37) are part of a confirmed system at…
A Catalog Sample of Low-mass Galaxies Observed in X-Rays with Central Candidate Black Holes
Nucita, A. A.; De Paolis, F.; Ingrosso, G. +2 more
We present a sample of X-ray-selected candidate black holes in 51 low-mass galaxies with z ≤ 0.055 and masses up to 1010 M ⊙ obtained by cross-correlating the NASA-SLOAN Atlas with the 3XMM catalog. We have also searched in the available catalogs for radio counterparts of the black hole candidates and find that 19 of the prev…
AGILE Observations of the Gravitational-wave Source GW170817: Constraining Gamma-Ray Emission from an NS-NS Coalescence
Antonelli, L. A.; Costa, E.; Barbiellini, G. +39 more
The LIGO-Virgo Collaboration (LVC) detected, on 2017 August 17, an exceptional gravitational-wave (GW) event temporally consistent within ∼ 1.7 {{s}} with the GRB 1708117A observed by Fermi-GBM and INTEGRAL. The event turns out to be compatible with a neutron star-neutron star (NS-NS) coalescence that subsequently produced a radio/optical/X-ray tr…
Discovery of a Very Bright and Intrinsically Very Luminous, Strongly Lensed Lyα Emitting Galaxy at z = 2.82 in the BOSS Emission-Line Lens Survey
Brownstein, Joel R.; Marques-Chaves, Rui; Oguri, Masamune +9 more
We report the discovery of a very bright (r = 20.16), highly magnified, and yet intrinsically very luminous Lyα emitter (LAE) at z=2.82. This system comprises four images in the observer plane with a maximum separation of ∼ 6\prime\prime and it is lensed by a z=0.55 massive early-type galaxy. It was initially identified in the Baryon Os…
Test of Weak Equivalence Principle with the Multi-band Timing of the Crab Pulsar
Zhang, Yueyang; Gong, Biping
The Weak Equivalent Principle (WEP) can be tested through the parameterized post-Newtonian parameter γ, representing the space curvature produced by unit rest mass. The parameter γ in turn has been constrained by comparing the arrival times of photons originating in distant transient events, such as gamma-ray bursts, fast radio bursts, and giant p…
Evolution of Molecular Clouds in the Superwind Galaxy NGC 1808 Probed by ALMA Observations
Salak, Dragan; Tomiyasu, Yuto; Nakai, Naomasa +3 more
ALMA imaging of the cold molecular medium in the nearby starburst galaxy NGC 1808 is presented. The observations reveal the distribution of molecular gas, traced by 12CO (1-0) and 12CO (3-2), and continuum (93 and 350 GHz) across the central 1 kpc starburst region at a high resolution of ∼ 1\prime\prime . A molecul…
Herschel Spectroscopy of Early-type Galaxies
Young, Lisa M.; Crocker, Alison; Lapham, Ryen Carl
We present Herschel spectroscopy of atomic lines arising in photodissociation regions as well as ionization regions of nearby early-type galaxies (ETGs), focusing on the volume-limited Atlas3D sample. Our data include the [C II], [O I], and [N II] 122 and 205 µm lines, along with ancillary data including CO and H I maps. We find that ETGs ha…