A5040950031- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Advanced X-ray Imaging Techniques
- High-pressure geophysics and materials
- Infrared Target Detection Methodologies
- Galaxies: Formation, Evolution, Phenomena
- Calibration and Measurement Techniques
- Astrophysics and Cosmic Phenomena
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Pulsars and Gravitational Waves Research
- Solid-state spectroscopy and crystallography
- X-ray Spectroscopy and Fluorescence Analysis
- GNSS positioning and interference
- CCD and CMOS Imaging Sensors
- Superconducting Materials and Applications
University of Hawaii at Hilo
2011-2024
University of Hawaii–West Oahu
2018
Gemini North Observatory
2017
Canada–France–Hawaii Telescope
2015
Joint Research Centre
2004-2009
Physical Research Laboratory
1998-1999
This paper defines the UKIRT Infrared Deep Sky Survey (UKIDSS) Early Data Release (EDR). UKIDSS is a set of five large near-infrared surveys being undertaken with United Kingdom Telescope Wide Field Camera (WFCAM). The programme began in 2005 May and has an expected duration 7 yr. Each survey uses some or all broad-band filter complement ZY JHK. EDR first public release data to European Southern Observatory (ESO) community. All worldwide releases occur after delay 18 months from ESO release....
The First Data Release (DR1) of the UKIRT Infrared Deep Sky Survey (UKIDSS) took place on 2006 July 21. UKIDSS is a set five large near-infrared surveys, covering complementary range areas, depths, and Galactic latitudes. DR1 first release survey-quality data from includes 320 sq degs multicolour to (Vega) K=18, complete (depending survey) in three bands ZYJHK, together with 4 deep JK an average depth K=21. In addition similar quantity incomplete filter coverage. JHK, regions low extinction,...
This paper defines the UK Infra-Red Telescope (UKIRT) Hemisphere Survey (UHS) and release of remaining ~12,700 sq.deg J-band survey data products. The UHS will provide continuous J K-band coverage in northern hemisphere from a declination 0 deg to 60 by combining existing Large Area Survey, Galactic Plane Clusters conducted under UKIRT Infra-red Deep Sky (UKIDSS) programme with this new additional area not covered UKIDSS. released includes imaging source catalogues over area, which, together...
JHK photometry in the Mauna Kea Observatory (MKO) near-IR system is presented for 115 stars. Of these, 79 are UKIRT standards and 42 LCO standards. The average brightness 11.5 mag, with a range of 10 to 15. number nights each star was observed 4, internal error final results 0.011 mag. These data agree those reported by other groups 0.02 measurements used derive transformations between MKO photometric UKIRT, 2MASS systems. 2MASS-MKO scatter 0.05 mag redder stars: 2MASS-J includes H2O...
We have carried out a near-infrared imaging survey of luminous young stellar outflow candidates using the United Kingdom Infrared Telescope. Observations were obtained in broad band K (2.2 mu) and through narrow filters at wavelengths H_2 v=1--0 S(1) (2.1218 Br gamma (2.166 lines. Fifty regions imaged with field view 2.2 X arcmin^2. Several embedded clusters are unveiled our images. 76% objects exhibit emission 50% or more aligned features suggesting collimated outflows, many which new...
We present the goals and preliminary results of an unbiased, near-infrared, narrow-band imaging survey first galactic quadrant (10° < l 65°; −13 b +13). This area includes most giant molecular clouds massive star forming regions in Northern hemisphere. The is centred on 1–0 S(1) rovibrational line H2, a proven tracer hot, dense gas star-forming regions, around evolved stars, supernova remnants. observations complement existing upcoming photometric surveys (Spitzer-GLIMPSE, UKIDSS-GPS,...
<i>Aims. <i/>A census of molecular hydrogen flows across the entire Orion A giant cloud is sought. With this paper we aim to associate each flow with its progenitor and associated core, so that characteristics outflows outflow sources can be established.<i>Methods. <i/>We present wide-field near-infrared images A, obtained Wide Field Camera, WFCAM, on United Kingdom Infrared Telescope. Broad-band K narrow-band H<sub>2<sub/> 1-0S(1) a contiguous ~8 square degree region are compared mid-IR...
Observed changes in protostellar brightness can be complicated to interpret. In our JCMT~Transient monitoring survey, we discovered that a young binary protostar, HOPS 373, is undergoing modest $30\%$ increase at 850 $\mu$m, caused by factor of 1.8$-$3.3 enhancement the accretion rate. The initial burst occurred over few months, with sharp rise and then shallower decay. A second soon after decay, source still bright one year later. mid-IR emission, small-scale CO outflow mapped ALMA,...
Recent near-IR images of massive star forming regions have revealed two collimated jets in the IRAS 18151-1208 region, one which is almost a parsec length (Varricatt et al.). Follow-up high-spectral-resolution echelle spectroscopy and 2-dimensional “integral field” associated molecular shock features are presented here. From these data kinematic information excitation maps extracted, show that morphologically, kinematically energetically similar to their counterparts from low mass...
We present high-resolution infrared (2--18 micron) images of the archetypal periodic dust-making Wolf-Rayet binary system WR140 (HD 193793) taken between 2001 and 2005, multi-colour (J -- [19.5]) photometry observed 1989 2001. The resolve dust cloud formed by in 2001, allowing us to track its expansion cooling, while allows tracking average temperature total mass dust. combination two datasets constrains optical properties most persistent features, concentrations at ends a `bar' emission...
While young stellar objects sometimes undergo bursts of accretion, these usually occur sporadically, making them challenging to study observationally and explain theoretically. We build a schematic description cyclical the object EC 53 using near-IR sub-mm monitoring obtained over six cycles, each lasting $\approx530$ days. brightens $0.12$ yr by $0.3$ mag at 850 $\mu$m, $2$ 3.35 $1.5$ wavelengths, maximum luminosity consistent with an accretion rate $\sim8\times10^{-6}$ M$_\odot$ yr$^{-1}$....
We present L'and M' photometry, obtained at UKIRT using the Mauna Kea Observatories Near-IR filter set, for 46 and 31 standard stars, respectively. The L' standards include 25 from in-house "Bright Standards" with magnitudes deriving Elias et al. (1982) observations IRTF in early 1980s, 21 fainter stars. derive results of Sinton & Tittemore (1984). estimate average external error to be 0.015 mag bright 0.025 standards, 0.026 standards. new provide a network homogeneously observed...
We report the detection and mass measurement of a binary lens OGLE-2015-BLG-1285La,b, with more massive component having $M_1>1.35\,M_\odot$ (80% probability). A main-sequence star in this range is ruled out by limits on blue light, meaning that primary must be neutron or black hole. The system has projected separation $r_\perp= 6.1\pm 0.4\,{\rm AU}$ lies Galactic bulge. These measurements are based "microlens parallax" effect, i.e., comparing microlensing light curve as seen from $Spitzer$,...
IRAS 17256−3631 is a southern Galactic massive star-forming region located at distance of 2 kpc. In this paper, we present multiwavelength investigation the embedded cluster, H ii region, as well parent cloud. Radio images 325, 610 and 1372 MHz were obtained using Giant Metrewave Telescope, India while near-infrared imaging spectroscopy carried out United Kingdom Infrared Telescope Mt. Abu India. The K-band image reveals presence partially infrared cluster. spectral features brightest star...
Abstract We report photometry and spectroscopy of the outburst young stellar object Gaia19bey. have established light curve with archival Gaia “ G ,” ATLAS “Orange,” Zwicky Transient Facility r -band, Pan-STARRS rizy ”-filter photometry, showing an ~4 yr duration, longer than typical EX Lupi objects but shorter FU Orionis objects. Its pre-outburst spectral energy distribution shows a flat far-infrared spectrum, confirming early evolutionary state Gaia19bey its similarity to other deeply...
We report on recent near-IR observations of V4332 Sgr—the nova-like variable that erupted in 1994. Its rapid, post-outburst evolution to a cool M-type giant/supergiant, soon after its outburst, showed it was an unusual object differing from other eruptive variables, such as classical/symbiotic novae or born-again asymptotic giant branch stars. The present study Sgr motivated by the keen interest eruption V838 Mon—an with spectacular light echo that, along Sgr, is believed belong new class...
We describe a search for the A-X infrared bands of AlO with view to better understand characteristics this radical. These are infrequently encountered in astronomical sources but surprisingly were very prominent spectra two well-known, nova-like variables (V838 Mon and V4332 Sgr) thereby motivating us explore physical conditions necessary their excitation. In study, we present detection 13 out 17 stars, selected on basis J-K colors as potential candidates these bands. The majority detections...
The United Kingdom Infrared Telescope (UKIRT) Widefield Survey for Fe$^+$ (UWIFE) is a 180 deg$^2$ imaging survey of the first Galactic quadrant (7$^{\circ}$ < l 62$^{\circ}$; |b| 1.5$^{\circ}$) using narrow-band filter centered on [Fe II] 1.644 {\mu}m emission line. good tracer dense, shock-excited gas, and will probe violent environments around stars: star-forming regions, evolved stars, supernova remnants, among others. UWIFE designed to complement existing UKIRT H2 (UWISH2; Froebrich et...
An eruptive nova-like event took place in 1994 the stellar-merger candidate V4332 Sgr. Following eruption, dust consisting of refractory silicate-rich grains containing a significant component AlO bonding was formed sometime between 1998 and 2003. Observations using Spitzer 2005 2009 show changes 10 μm silicate stretch feature. There is deepening as well development feature about 13 20 consistent with blend MgO FeO stretching features O–Si–O bending mode increasingly ordered dust....
We present a multiwavelength study of the extended green object, G12.42+0.50, in this paper. The associated ionized, dust, and molecular components source are studied detail employing various observations at near-, mid- far-infrared, submillimetre, radio wavelengths. Radio continuum emission mapped 610 1390 MHz, using Giant Meterwave Telescope, India, advocates for scenario coexistence an UC H ii region ionized thermal jet possibly powered by massive young stellar IRAS 18079-1756, with...
ABSTRACT We present archival and ground-based infrared observations of the γ-ray-emitting nova V959 Mon, covering period 100–4205 d after 2012 eruption. use these data to determine that secondary in system is a G5 main sequence star. Data from NEOWISE survey reveal significant increase emission at 3.4 4.6 $\, \mu$m late (≳600 d) times, which we interpret as by dust. Other interpretations are considered but cannot be reconciled with data. The presence such dust emission, particular its...
Echelle spectroscopy of H22.122μm, [Feii]1.644μm and Brγ line emission from a very young planetary nebula (PN), IRAS21282+5050, four protoplanetary nebulae (PPN), IRAS 19343+2926 (M1−92), IRAS17150−3224 (AFGL 6815), IRAS17423−1755 (Hen 3−1475) IRAS17441−2411, is presented. H2 detected in discrete shock fronts the lobes each nebula, regardless source spectral type [although non-detections 09371+1212 (Frosty Leo) support claims that late types do not produce bright emission]. In...
We have searched for the important radioactive isotope 26Al in nova-like source V4332 Sgr. Recent results from gamma-ray astronomy show that there is pervasive emission of 1.809 MeV photon, arising decay to 26Mg, all over Galactic plane. Although sites where this originates are not clearly established, novae believed be an contributing source. In context, Sgr presented a rare opportunity observationally investigate whether or sources synthesize and what extent. Strong AlO bands near-IR been...