Search Publications
Dense Molecular Filaments Feeding a Starburst: ALMA Maps of CO(3-2) in Henize 2-10
Turner, Jean L.; Beck, Sara C.; Consiglio, S. Michelle
We present Atacama Large Millimeter/Submillimeter Array CO(3-2) observations at 0.″3 resolution of He 2-10, a starburst dwarf galaxy and possible high-z galaxy analog. The warm dense gas traced by CO(3-2) is found in clumpy filaments that are kinematically and spatially distinct. The filaments have no preferred orientation or direction; this may i…
The Halo Masses of Galaxies to z ∼ 3: A Hybrid Observational and Theoretical Approach
Conselice, Christopher J.; Hartley, William; Twite, Jonathan W. +1 more
We use a hybrid observational/theoretical approach to study the relation between galaxy kinematics and the derived stellar and halo masses of galaxies up to z = 3 as a function of stellar mass, redshift, and morphology. Our observational sample consists of a concatenation of 1125 galaxies with kinematic measurements at 0.4 < z < 3 from long-…
A Transitional Disk around an Intermediate-mass Star in the Sparse Population of the Orion OB1 Association
Briceño, Cesar; Calvet, Nuria; Hernández, Jesús +8 more
We present a detailed study of the disk around the intermediate-mass star SO 411, aiming to explain the spectral energy distribution of this star. We show that this is a transitional disk truncated at ∼11 au, with ∼0.03 lunar masses of optically thin dust inside the cavity. Gas also flows through the cavity, since we find that the disk is still ac…
Delayed Stellar Mass Assembly in the Low Surface Brightness Dwarf Galaxy KDG 215
McQuinn, Kristen B. W.; Cannon, John M.; Dolphin, Andrew E. +17 more
We present H I spectral line and optical broadband images of the nearby low surface brightness dwarf galaxy KDG 215. The H I images, acquired with the Karl G. Jansky Very Large Array, reveal a dispersion-dominated interstellar medium with only weak signatures of coherent rotation. The H I gas reaches a peak mass surface density of 6 M ⊙…
2MASS J11151597+1937266: A Young, Dusty, Isolated, Planetary-mass Object with a Potential Wide Stellar Companion
Burgasser, Adam J.; Gagné, Jonathan; Bardalez Gagliuffi, Daniella C. +4 more
We present 2MASS J11151597+1937266, a recently identified low-surface-gravity L dwarf, classified as an L2γ based on Sloan Digital Sky Survey optical spectroscopy. We confirm this spectral type with near-infrared spectroscopy, which provides further evidence that 2MASS J11151597+1937266 is a low-surface-gravity L dwarf. This object also shows sign…
M31 PAndromeda Cepheid Sample Observed in Four HST Bands
Bender, Ralf; Seitz, Stella; Hopp, Ulrich +5 more
Using the M31 PAndromeda Cepheid sample and the HST PHAT data, we obtain the largest Cepheid sample in M31 with HST data in four bands. For our analysis we consider three samples: a very homogeneous sample of Cepheids based on the PAndromeda data, the mean magnitude corrected PAndromeda sample and a sample complementing the PAndromeda sample with …
NOEMA Observations of a Molecular Cloud in the Low-metallicity Galaxy Kiso 5639
Elmegreen, Bruce G.; Rubio, Monica; Muñoz-Tuñón, Casiana +4 more
A giant star-forming region in a metal-poor dwarf galaxy has been observed in optical lines with the 10 m Gran Telescopio Canarias (GTC) and in the emission line of CO(1-0) with the Northern Extended Millimeter Array (NOEMA) mm-wave interferometer. The metallicity was determined to be 12+{log}({{O}}/{{H}})=7.83+/- 0.09, from which we estimate a co…
Quest for the Donor Star in the Magnetic Precataclysmic Variable V1082 Sgr
González, J. F.; Zharikov, S.; Tovmassian, G. +3 more
We obtained high-resolution spectra and multicolor photometry of V1082 Sgr to study the donor star in this 20.8 hr orbital period binary, which is assumed to be a detached system. We measured the rotational velocity (v\sin i=26.5+/- 2.0 km s-1), which, coupled with the constraints on the white dwarf mass from the X-ray spectroscopy, lea…
The Embedded Ring-like Feature and Star Formation Activities in G35.673-00.847
Dewangan, L. K.; Ojha, D. K.; Devaraj, R.
We present a multiwavelength study to probe the star formation (SF) process in the molecular cloud linked with the G35.673-00.847 site (hereafter MCG35.6), which is traced in a velocity range of 53-62 km s-1. Multiwavelength images reveal a semi-ring-like feature (associated with ionized gas emission) and an embedded face-on ring-like f…
New Insights into the Formation of the Blue Main Sequence in NGC 1850
Milone, Antonino P.; Deng, Licai; de Grijs, Richard +2 more
Recent discoveries of bimodal main sequences (MSs) associated with young clusters (with ages ≲1 Gyr) in the Magellanic Clouds have drawn a lot of attention. One of the prevailing formation scenarios attributes these split MSs to a bimodal distribution in stellar rotation rates, with most stars belonging to a rapidly rotating population. In this sc…