A5041000604- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Superconducting and THz Device Technology
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Semiconductor Lasers and Optical Devices
- Molecular Spectroscopy and Structure
- Laser Design and Applications
- Scientific Research and Discoveries
- CCD and CMOS Imaging Sensors
- Astro and Planetary Science
- Advanced Measurement and Metrology Techniques
- Relativity and Gravitational Theory
- Scientific Measurement and Uncertainty Evaluation
- Impact of Light on Environment and Health
- Particle Detector Development and Performance
Chinese Academy of Science South America Center for Astronomy
2016-2020
Chinese Academy of Sciences
2016-2020
National Astronomical Observatories
2016-2020
University of Chile
2017-2020
Infrared Processing and Analysis Center
2005-2017
California Institute of Technology
2007-2017
National Aeronautics and Space Administration
2013
Jet Propulsion Laboratory
1998-2010
University of Massachusetts Amherst
2006
Institut für Palliative Care
1997
The Multiband Imaging Photometer for Spitzer (MIPS) provides long-wavelength capability the mission in imaging bands at 24, 70, and 160 μm measurements of spectral energy distributions between 52 100 a resolution about 7%. By using true detector arrays each band, it both critical sampling point-spread function relatively large fields view, allowing substantial advances sensitivity, angular resolution, efficiency areal coverage compared with previous space far-infrared capabilities. 24 array...
We present the first results of a survey [CII]158um emission line in 241 luminous infrared galaxies (LIRGs) comprising Great Observatories All-sky Survey (GOALS) sample, obtained with PACS instrument on board Herschel. The [CII] luminosities LIRGs GOALS range from ~10^7 to 2x10^9 Lsun. find that show tight correlation [CII]/FIR far-IR flux density ratios, strong negative trend spanning ~10^-2 10^-4, as average temperature dust increases. correlations between ratio and strength 9.7um silicate...
Abstract We present an analysis of <?CDATA ${[{\rm{O}}{\rm{I}}]}_{63}$?> , [O iii ] 88 [N ii 122 and ${[{\rm{C}}{\rm{II}}]}_{158}$?> far-infrared (FIR) fine-structure line observations obtained with Herschel /PACS, for ∼240 local luminous infrared galaxies (LIRGs) in the Great Observatories All-sky LIRG Survey. find pronounced declines (“deficits”) line-to-FIR continuum emission as a function FIR color luminosity surface density, ${{\rm{\Sigma }}}_{\mathrm{IR}}$?> . The median electron...
Context. The far-infrared (FIR) lines are important tracers of the cooling and physical conditions interstellar medium (ISM) rapidly becoming workhorse diagnostics for galaxies throughout universe. There clear indications a different behavior these at low metallicity that needs to be explored.
The most important cooling lines of the neutral interstellar medium (ISM) lie in far-infrared (FIR). We present measurements by Infrared Space Observatory Long Wavelength Spectrometer seven from and ionized ISM 60 normal, star-forming galaxies. galaxy sample spans a range properties such as morphology, FIR colors (indicating dust temperature), FIR/blue ratios star formation activity optical depth). In two-thirds galaxies this sample, [C II] line flux is proportional to continuum. other...
SPIRE, the Spectral and Photometric Imaging REceiver, is <i>Herschel<i/> Space Observatory's submillimetre camera spectrometer. It contains a three-band imaging photometer operating at 250, 350 500 <i>μ<i/>m, an Fourier-transform spectrometer (FTS) covering 194–671 <i>μ<i/>m (447-1550 GHz). In this paper we describe initial approach taken to absolute calibration of SPIRE instrument using combination emission from telescope itself modelled continuum solar system objects other astronomical...
Aims. In this work, we aim to provide a consistent analysis of the dust properties from metal-poor metal-rich environments by linking them fundamental galactic parameters.
We describe the procedure used to flux calibrate three-band submillimetre photometer in Spectral and Photometric Imaging Receiver instrument on Herschel Space Observatory. This includes equations describing calibration scheme, a justification for using Neptune as primary source, description of observations data processing procedures derive parameters (for converting from voltage density) every bolometer each array, an analysis error budget individual bolometers tests secondary calibrators....
We present correlations between 9 CO transition ($J=4-3$ to $12-11$) and beam-matched far-infrared (Far-IR) luminosities ($L_{\mathrm{FIR},\,b}$) among 167 local galaxies, using {\it{Herschel}} Spectral Photometric Imaging Receiver Fourier Transform Spectrometer (SPIRE; FTS) spectroscopic data Photoconductor Array Camera (PACS) photometry data. adopt entire-galaxy FIR ($L_{\mathrm{FIR},\,e}$) from the {\it{IRAS}} Revised Bright Galaxy Sample correct $L_{\mathrm{FIR},\,b}$ PACS images match...
We present the first Herschel spectroscopic detections of [OI]63 and [CII]158 micron fine-structure transitions, a single para-H2O line from 35 x 15 kpc^2 shocked intergalactic filament in Stephan's Quintet. The is believed to have been formed when high-speed intruder group collided with clumpy intergroup gas. Observations PACS spectrometer provide evidence for broad (> 1000 km s^-1) luminous [CII] profiles, as well fainter [OI]63micron emission. SPIRE FTS observations reveal water emission...
We report measurements of the [C II] fine-structure line at 157.714 μm in 30 normal star-forming galaxies with Long Wavelength Spectrometer (LWS) on Infrared Space Observatory (ISO). The ratio to total far-infrared (FIR) luminosity, LC II/LFIR, measures cooling gas that dust, and thus efficiency grain photoelectric heating process. This varies by more than a factor 40 current sample. About two-thirds have II/LFIR ratios narrow range (2-7) × 10−3. other one-third show trends decreasing...
We present ISOPHOT spectra of the regions 2.5-4.9 μm and 5.8-11.6 for a sample 45 disk galaxies from US Infrared Space Observatory Key Project on Normal Galaxies. The were selected to span range in global properties normal, star-forming local universe. can be decomposed into three spectral components: (1) continuum emission stellar photospheres, which dominates near-infrared (NIR; μm) region; (2) weak NIR excess continuum, has color temperature ~103 K, carries luminosity few percent total...
We present the discovery of strong mid-infrared emission lines molecular hydrogen apparently high velocity dispersion (~870 km/s) originating from a group-wide shock wave in Stephan's Quintet. These Spitzer Space Telescope observations reveal and little else. this is first time an almost pure H_2 line spectrum has been seen extragalactic object. Along with absence PAH features very low excitation ionized gas tracers, spectra resemble shocked Galactic supernova remnants, but on vast scale....
Context. Dust reprocesses about half of the stellar radiation in galaxies. The thermal re-emission by dust absorbed energy is considered to be driven merely young stars so often applied tracing star formation rate Recent studies have argued that old population might responsible for a non-negligible fraction radiative heating.
We describe a Herschel Space Observatory 194-671 micron spectroscopic survey of sample 121 local luminous infrared galaxies and report the fluxes CO $J$ to $J$-1 rotational transitions for $4 \leqslant J 13$, [NII] 205 um line, [CI] lines at 609 370 um, as well additional usually fainter lines. The spectral line energy distributions (SLEDs) presented here are consistent with our earlier work, which was based on smaller sample, that calls two distinct molecular gas components in general: (i)...
The Herschel SPIRE instrument consists of an imaging photometric camera and Fourier Transform Spectrometer (FTS), both operating over a frequency range 450-1550 GHz. In this paper, we briefly review the FTS design, operation, data reduction, describe in detail approach taken to relative calibration (removal signatures) absolute against standard astronomical sources. scheme assumes spatially extended source uses telescope as primary calibrator. Conversion from point-source is carried out...
Abstract We present a statistical study of the [C i ] ( 3 P 1 0 ), 2 ) lines (hereafter (1–0) and (2–1), respectively) CO(1–0) line for sample (ultra-)luminous infrared galaxies ((U)LIRGs). explore correlations between luminosities lines, find that correlates almost linearly with both , suggesting can trace total molecular gas mass, at least (U)LIRGs. also investigate dependence / on far-infrared color 60-to-100 μ m, non-correlation, weak correlation, modest respectively. Under assumption...
The mid-infrared spectra (2.5-5 and 5.7-11.6 µm) obtained by ISOPHOT reveal the interstellar medium emission from galaxies powered star formation to be strongly dominated aromatic features at 6.2, 7.7, 8.6, 11.3 µm. Additional appears in between features, an underlying continuum is clearly evident 3-5 This would contribute about a third of luminosity 3-13 µm range. together carry 5%-30% 40-120 far-infrared (FIR) luminosity. relative fluxes individual depend very weakly on galaxy parameters...
We present results from the mid-infrared spectral mapping of Stephan's Quintet using Spitzer Space Telescope. A 1000 km s-1 collision (tcol = 5 × 106 yr) has produced a group-wide shock, and for first time large-scale distribution warm molecular hydrogen emission is revealed, as well its close association with known shock structures. In main region alone we find 5.0 108 M☉ H2 spread over ∼480 kpc2 additionally report discovery second major shock-excited feature, likely remnant previous tidal...
We present Herschel/PACS observations of extended [CII]157.7{\mu}m line emission detected on ~ 1 - 10 kpc scales in 60 local luminous infrared galaxies (LIRGs) from the Great Observatories All-sky LIRG Survey (GOALS). find that most extra-nuclear show [CII]/FIR ratios >~ 4 x 10^-3, larger than mean ratio seen nuclei, and similar to those found disks normal star-forming diffuse inter-stellar medium (ISM) our Galaxy. The [CII] "deficits" LIRGs are therefore restricted their nuclei. There is a...
We present ALMA Cycle-0 observations of the CO (6–5) line emission and 435 μm dust continuum in central kiloparsec NGC 1614, a local luminous infrared galaxy at distance 67.8 Mpc (). The is well resolved by beam (026 × 020) into circumnuclear ring, with an integrated flux fCO(6–5) = 898 (± 153) Jy km s−1, which 63(± 12)% total measured Herschel. molecular located between from nucleus, looks clumpy includes seven unresolved (or marginally resolved) knots median velocity dispersion ∼40 s−1....
ABSTRACT In this paper, we present the measurements of [N ii ] 205 μ m line for a flux-limited sample 122 (ultra-)luminous infrared galaxies [(U)LIRGs] and 20 additional normal galaxies, obtained with Herschel Space Observatory ( ). We explore far-infrared (FIR) color dependence L ]205 ) to total IR luminosity ratio, find that / only depends modestly on 70–160 flux density ratio <?CDATA ${f}_{70}/{f}_{160}$?> <?MML <mml:math> <mml:msub> <mml:mrow> <mml:mi>f</mml:mi> </mml:mrow>...