Jeffrey L. Carlin
A5028668031- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Scientific Research and Discoveries
- Spectroscopy and Laser Applications
- Inertial Sensor and Navigation
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Scientific Computing and Data Management
- Space Exploration and Technology
- Geological formations and processes
- Spacecraft Dynamics and Control
- Methane Hydrates and Related Phenomena
- Atmospheric Ozone and Climate
- Mechanics and Biomechanics Studies
- Computational Physics and Python Applications
NSF’s NOIRLab
2021-2024
Campbell Collaboration
2023
Community Science and Data Center
2021-2022
Vera C. Rubin Observatory
2022
Large Synoptic Survey Telescope Corporation
2016-2021
Max Planck Institute for Astronomy
2019
Max Planck Society
2019
Rensselaer Polytechnic Institute
2011-2018
University of Arizona
2018
Earlham College
2014-2016
(Abridged) We describe here the most ambitious survey currently planned in optical, Large Synoptic Survey Telescope (LSST). A vast array of science will be enabled by a single wide-deep-fast sky survey, and LSST have unique capability faint time domain. The design is driven four main themes: probing dark energy matter, taking an inventory Solar System, exploring transient optical sky, mapping Milky Way. wide-field ground-based system sited at Cerro Pach\'{o}n northern Chile. telescope 8.4 m...
We present UV, optical, and NIR photometry of the first electromagnetic counterpart to a gravitational wave source from Advanced LIGO/Virgo, binary neutron star merger GW170817. Our data set extends discovery optical at $0.47$ days $18.5$ post-merger, includes observations with Dark Energy Camera (DECam), Gemini-South/FLAMINGOS-2 (GS/F2), {\it Hubble Space Telescope} ({\it HST}). The spectral energy distribution (SED) inferred this $0.6$ is well described by blackbody model $T\approx 8300$...
The Large sky Area Multi-Object Spectroscopic Telescope (LAMOST) General Survey is a spectroscopic survey that will eventually cover approximately half of the celestial sphere and collect 10 million spectra stars, galaxies QSOs. Objects both in pilot first year general are included LAMOST First Data Release (DR1). started October 2011 ended June 2012, data have been released to public as Pilot August 2012. September completed its operation 2013. DR1 includes total 1202 plates containing...
Abstract We present the Dark Energy Camera (DECam) discovery of optical counterpart first binary neutron star merger detected through gravitational-wave emission, GW170817. Our observations commenced 10.5 hr post-merger, as soon localization region became accessible from Chile. imaged 70 deg 2 in i and z bands, covering 93% initial integrated probability, to a depth necessary identify likely counterparts (e.g., kilonova). At 11.4 post-merger we bright transient located nucleus NGC 4993 at...
We describe the current plans for a spectroscopic survey of millions stars in Milky Way galaxy using Guo Shou Jing Telescope (GSJT, formerly Large Area Multi-Object Spectroscopic - LAMOST). The will obtain spectra 2.5 million brighter than $r<19$ during dark/grey time, and 5 $r<17$ or $J<16$ on nights that are moonlit have low transparency. begin fall 2012, run at least four years. telescope design constrains optimal declination range observations to $10^\circ<\delta<50^\circ$, site...
Abstract We present the discovery of Aquarius III, an ultra-faint Milky Way satellite galaxy identified in second data release DECam Local Volume Exploration survey. Based on deeper follow-up imaging with DECam, we find that III is a low-luminosity ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mi>V</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mo>−</mml:mo> <mml:msubsup> <mml:mn>2.5</mml:mn>...
We show that in the anticenter region, between Galactic longitudes of $110^\circ<l<229^\circ$, there is an oscillating asymmetry main sequence star counts on either side plane using data from Sloan Digital Sky Survey. This oscillates more stars north at distances about 2 kpc Sun to south 4-6 8-10 Sun. also see evidence are 12-16 The three distant asymmetries form roughly concentric rings around center, opening direction Milky Way's spiral arms. northern ring, 9 Sun, easily identified with...
We use about 200,000 FGK-type main-sequence stars from the LAMOST DR1 data to map local stellar kinematics. With velocity deprojection technique, we are able derive averaged three-dimensional and ellipsoids using only line-of-sight for with various effective temperatures within pc. Using mean velocities of cool stars, solar motion (, , ) = (9.58 ± 2.39, 10.52 1.96, 7.01 1.67) respect standard rest. Moreover, find that K show a net asymmetric ∼3 in compared K. And their azimuthal increases...
We present deep Magellan/Megacam stellar photometry of four recently discovered faint Milky Way satellites: Sagittarius II (Sgr II), Reticulum (Ret Phoenix (Phe and Tucana III (Tuc III). Our reaches ~2-3 magnitudes deeper than the discovery data, allowing us to revisit properties these new objects (e.g., distance, structural properties, luminosity measurements, signs tidal disturbance). The satellite color-magnitude diagrams show that they are all old (~13.5 Gyr) metal-poor...
Abstract We present the second public data release (DR2) from DECam Local Volume Exploration survey (DELVE). DELVE DR2 combines new observations with archival Dark Energy Survey, Legacy and other community programs. consists of ∼160,000 exposures that cover >21,000 deg 2 high-Galactic-latitude (∣ b ∣ > 10°) sky in four broadband optical/near-infrared filters ( g , r i z ). provides point-source automatic aperture photometry for ∼2.5 billion astronomical sources a median 5 σ depth =...
Tidal features in the outskirts of galaxies yield unique information about their past interactions and are a key prediction hierarchical structure formation paradigm. The Vera C. Rubin Observatory is poised to deliver deep observations for potentially millions objects with visible tidal features, but inference galaxy interaction histories from such not straightforward. Utilising automated techniques human visual classification conjunction realistic mock images produced using NEWHORIZON...
We report the discovery of six ultra-faint Milky Way satellites discovered through matched-filter searches conducted using Dark Energy Camera (DECam) data processed as part second release DECam Local Volume Exploration (DELVE) survey. Leveraging deep Gemini/GMOS-N imaging (for four candidates) well follow-up two candidates), we characterize morphologies and stellar populations these systems. find that candidates all share faint absolute magnitudes ($M_{V} \geq -3.2$ mag) old, metal-poor...
We report the discovery of Pegasus IV, an ultra-faint dwarf galaxy found in archival data from Dark Energy Camera processed by DECam Local Volume Exploration Survey. IV is a compact, stellar system ($r_{1/2} = 41^{+8}_{-6}$ pc; $M_V -4.25 \pm 0.2$ mag) located at heliocentric distance $90^{+4}_{-6}$ kpc. Based on spectra seven non-variable member stars observed with Magellan/IMACS, we confidently resolve IV's velocity dispersion, measuring $\sigma_{v} 3.3^{+1.7}_{-1.1} \text{ km s}^{-1}$...
Abstract We report results from a systematic wide-area search for faint dwarf galaxies at heliocentric distances 0.3 to 2 Mpc using the full 6 yr of data Dark Energy Survey (DES). Unlike previous searches over DES data, this specifically targeted field population located beyond Milky Way virial radius. derive our detection efficiency faint, resolved in Local Volume with set synthetic and expect be complete M V ∼ (−7, −10) mag D = (0.3, 2.0) Mpc. find no new dwarfs footprint, but we discovery...
We find that Galactic disk stars near the anticenter exhibit velocity asymmetries in both Galactocentric radial and vertical components across mid-plane as well azimuthally. These findings are based on LAMOST spectroscopic velocities for a sample of ~400,000 F-type stars, combined with proper motions from PPMXL catalog which we have derived corrections to zero points part spectroscopically discovered galaxies QSOs LAMOST. In region within 2 kpc outside Sun's radius +/-2 midplane, show above...
We present a support vector machine classifier to identify the K giant stars from LAMOST survey directly using their spectral line features. The completeness of identification is about 75% for tests based on stellar parameters. contamination in identified sample lower than 2.5%. Applying classification method two million spectra observed during pilot and first year survey, we select 298,036 candidates. metallicities are also estimated with an uncertainty 0.13 ∼ 0.29 dex equivalent widths Mgb...
We report the discovery of faintest known dwarf galaxy satellite an LMC stellar-mass host beyond Local Group, based on deep imaging with Subaru/Hyper Suprime-Cam. MADCASH J074238+652501-dw lies $\sim$35 kpc in projection from NGC 2403, a spiral at $D$$\approx$3.2 Mpc. This new has $M_{g} = -7.4\pm0.4$ and half-light radius $168\pm70$ pc, calculated distance $3.39\pm0.41$ The color-magnitude diagram reveals no evidence young stellar populations, suggesting that is old, metal-poor similar to...
Recent discovery of many dwarf satellite galaxies in the direction Small and Large Magellanic Clouds (SMC LMC) provokes questions their origins, what they can reveal about galaxy evolution theory. Here, we predict stellar mass function Cloud-mass host using abundance matching reionization models applied to \textit{Caterpillar} simulations. Specifically focusing on volume within $50$~kpc LMC, a mean 4-8 satellites with $M_* > 10^4\, \mathrm{M_\odot}$, 3-4 $80 < M_* \leq 3000\,...
We report the first hypervelocity star (HVS) discovered from LAMOST spectroscopic survey. It is a B-type with heliocentric radial velocity of about 620 km s−1, which projects to Galactocentric component ∼477 s−1. With distance ∼13 kpc and an apparent magnitude mag, it closest bright HVS currently known. mass ∼9 M☉, one three most massive HVSs so far. The clustered on sky many other known HVSs, its position suggests possible connection Galactic center structures. current poorly determined...
ABSTRACT In order to constrain the evolutionary history of Milky Way, we hunt for faint RR Lyrae stars (RRLs) using Dark Energy Camera data from High cadence Transient Survey and Halo Outskirts With Variable Stars survey. We report detection $\sim$500 RRLs, including previously identified $\sim$90 RRLs not yet reported. identify nine new beyond 100 kpc Sun, most which are classified as fundamental-mode pulsators. The periods amplitudes distant do place them in either one two classical...
ABSTRACT While dwarf galaxies observed in the field are overwhelmingly star forming, environments as dense or denser than Milky Way quenched. In this paper, we explore quenching lower density environment of Small-Magellanic-Cloud-mass galaxy NGC 3109 (M$_* \sim 10^8 \, \text{M}_\odot$), which hosts two known satellite (Antlia and Antlia B), both ${\rm H}\, \rm{\small I}$ deficient compared to similar have recently stopped forming stars. Using a new semi-analytic model concert with measured...
We present a three dimensional velocity analysis of Milky Way disk kinematics using LAMOST K giant stars and the GPS1 proper motion catalogue. find that Galactic near anticenter direction (in range Galactocentric distance between $R=8$ $13$ kpc vertical position $Z=-2$ $2$ kpc) exhibit asymmetrical motions in radial, azimuthal, components. Radial are not zero, thus departing from circularity orbits; they increase outwards within $R\lesssim 12$ kpc, show some oscillation northern ($0 < Z 2$...
We present the discovery of a candidate ultra-faint Milky Way satellite, Eridanus IV (DELVE J0505$-$0931), detected in photometric data from DECam Local Volume Exploration survey (DELVE). is faint ($M_V = -4.7 \pm 0.2$), extended ($r_{1/2} 75^{+16}_{-13}$ pc), and elliptical ($\epsilon 0.54 0.1$) system at heliocentric distance $76.7^{+4.0}_{-6.1}$ kpc, with stellar population that well-described by an old, metal-poor isochrone (age $\tau \sim 13.0$ Gyr metallicity ${\rm [Fe/H] \lesssim...