P. G. Martin
A5091575644- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Dark Matter and Cosmic Phenomena
- Molecular Spectroscopy and Structure
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Superconducting and THz Device Technology
- Lymphoma Diagnosis and Treatment
- Spectroscopy and Laser Applications
- Atomic and Molecular Physics
- Calibration and Measurement Techniques
- Advanced Chemical Physics Studies
- History and Developments in Astronomy
- Particle physics theoretical and experimental studies
- Geophysics and Gravity Measurements
Defence Science and Technology Laboratory
2018-2025
Canadian Institute for Theoretical Astrophysics
2014-2024
University of Toronto
2015-2024
Cornell University
2013-2024
NewYork–Presbyterian Hospital
2022-2024
New York Hospital Queens
2024
Presbyterian Hospital
2024
American University of Iraq Sulaimani
2023
California State University, Fresno
2023
Australian National University
2022
We summarize the first results from Gould Belt survey, obtained toward Aquila Rift and Polaris Flare regions during 'science demonstration phase' of Herschel. Our 70-500 micron images taken in parallel mode with SPIRE PACS cameras reveal a wealth filamentary structure, as well numerous dense cores embedded filaments. Between ~ 350 500 prestellar 45-60 Class 0 protostars can be identified field, while unbound starless no are observed field. The core mass function (CMF) derived for region...
We present the first results from science demonstration phase for Hi-GAL survey, <i>Herschel<i/> key program that will map inner Galactic plane of Milky Way in 5 bands. outline our data reduction strategy and some highlights on two observed 2° × tiles approximately centered at <i>l<i/> = 30° 59°. The regions are extremely rich intense highly structured extended emission which shows a widespread organization filaments. Source SEDs can be built hundreds objects fields, physical parameters...
We provide a first look at the results of Herschel Gould Belt survey toward IC5146 molecular cloud and present preliminary analysis filamentary structure in this region. The column density map, derived from our 70-500 micron data, reveals complex network filaments, confirms that these filaments are main birth sites prestellar cores. analyze profiles 27 show underlying radial fall off as r^{-1.5} to r^{-2.5} large radii. Our result is seem be characterized by narrow distribution widths having...
MIPSGAL is a 278 deg2 survey of the inner Galactic plane using Multiband Infrared Photometer for Spitzer aboard Space Telescope. The field was imaged in two passbands, 24 and 70 μm with resolutions 6'' 18'', respectively. designed to provide uniform, well-calibrated well-characterized data set general inquiry as longer-wavelength complement shorter-wavelength plane: Plane Mapping Survey Extraordinaire. primary science drivers current are identify all high-mass (M > 5 M⊙) protostars disk...
We analyse the Planck full-mission cosmic microwave background (CMB) temperature and E -mode polarization maps to obtain constraints on primordial non-Gaussianity (NG). compare estimates obtained from separable template-fitting, binned, optimal modal bispectrum estimators, finding consistent values for local, equilateral, orthogonal amplitudes. Our combined analysis produces following final results: f NL local = −0.9 ± 5.1; equil −26 47; ortho −38 24 (68% CL, statistical). These results...
The Canadian Galactic Plane Survey (CGPS) is a project to combine radio, millimeter, and infrared surveys of the plane provide arcminute-scale images all major components interstellar medium over large portion disk. We describe in detail observations for low-frequency component CGPS, radio carried out at Dominion Radio Astrophysical Observatory (DRAO), summarize properties merged database that comprises CGPS. DRAO Synthesis Telescope have imaged 73° section plane, using ∼85% telescope time...
Hi-GAL, the Herschel infrared Galactic Plane Survey, is an Open Time Key Project of Space Observatory. It will make unbiased photometric survey inner plane by mapping a 2° wide strip in longitude range ∣l∣ < 60° five wavebands between 70 μm and 500 μm. The aim Hi-GAL to detect earliest phases formation molecular clouds high-mass stars use optimum combination wavelength coverage, sensitivity, strategy, speed deliver homogeneous census star-forming regions cold structures interstellar medium....
We present first results from the Herschel Gould Belt survey for B211/L1495 region in Taurus molecular cloud. Thanks to their high sensitivity and dynamic range, images reveal structure of dense, star-forming filament B211 with unprecedented detail, along presence striations perpendicular generally oriented magnetic field direction as traced by optical polarization vectors. Based on column density dust temperature maps derived data, we find that radial profile approaches a power-law behavior...
Analysis of the Planck 2018 data set indicates that statistical properties cosmic microwave background (CMB) temperature anisotropies are in excellent agreement with previous studies using 2013 and 2015 releases. In particular, they consistent Gaussian predictions $Λ$CDM cosmological model, yet also confirm presence several so-called "anomalies" on large angular scales. The novelty current study, however, lies being a first attempt at comprehensive analysis statistics polarization signal...
view Abstract Citations (529) References (54) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Shape and Clustering Effects on the Optical Properties of Amorphous Carbon Rouleau, Francois ; Martin, P. G. constants for some samples amorphous carbon are presented energy range 0.0041-3500 eV, using a self-consistent method which combines extinction data in infrared with other measurements optical at higher energy. By construction, satisfy Kramers-Kronig...
view Abstract Citations (445) References (59) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Size Distribution of Interstellar Dust Particles as Determined from Extinction Kim, Sang-Hee ; Martin, P. G. Hendry, Paul D. We have investigate the character changes in size distribution, and illustrate this with two contrasting cases: diffuse interstellar medium (RV = 3.1), a dense cloud region 5.3). For exploratory investigation we adopted spherical bare...
${\ensuremath{\Lambda}}^{0}$ polarization has been observed in $p+\mathrm{Be}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}^{0}+\mathrm{anything}$ at 300 GeV. A total of 1.2 \ifmmode\times\else\texttimes\fi{} ${10}^{6}$ decays were recorded fixed lab angles between 0 and 9.5 mrad, covering a range kinematic variables $0.3<~x<~0.7$ $0<~{p}_{\ensuremath{\perp}}<~1.5$ GeV/c. The was consistent with parity conservation increased monotonically increasing ${p}_{\ensuremath{\perp}}$, independently...
The VLA Galactic Plane Survey (VGPS) is a survey of H I and 21 cm continuum emission in the plane between longitude 18° 67° with latitude coverage from |b| < 13 to 23. area was observed Very Large Array 990 pointings. Short-spacing information for line obtained by additional observations Green Bank Telescope. spectral images are presented resolution 1' × 1.56 km s-1 (FWHM) an rms noise 2 K per 0.824 channel. Continuum made channels without have resolution. VGPS reveal structures atomic...
view Abstract Citations (502) References (43) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Steps toward Determination of the Size and Structure Broad-Line Region in Active Galactic Nuclei. I. an 8 Month Campaign Monitoring NGC 5548 with IUE Clavel, J. ; Reichert, G. A. Alloin, D. Crenshaw, M. Kriss, Krolik, H. Malkan, Netzer, Peterson, B. Wamsteker, W. Altamore, Baribaud, T. Barr, P. Beck, S. Binette, L. Bromage, E. Brosch, N. Diaz, Filippenko, V. Fricke,...
We present full-sky maps of the cosmic microwave background (CMB) and polarized synchrotron thermal dust emission, derived from third set Planck frequency maps. These products have significantly lower contamination instrumental systematic effects than previous versions. The methodologies used to derive these follow those described in earlier papers, adopting four methods (Commander, NILC, SEVEM, SMICA) extract CMB component, as well three GNILC, astrophysical components. Our revised...
For many years feedback processes generated by OB-stars in molecular clouds, including expanding ionization fronts, stellar winds, or UV-radiation, have been proposed to trigger subsequent star formation. However, hydrodynamic models radiation and gravity show that UV-illumination has little no impact on the global dynamical evolution of cloud. The Rosette cloud, irradiated NGC2244 cluster, is a template region for triggered star-formation, we investigated its spatial density structure...
Thermal images of cold dust in the Central Molecular Zone Milky Way, obtained with far-infrared cameras on board Herschel satellite, reveal a ∼3 × 107 M☉ ring dense and clouds orbiting Galactic center. Using simple toy model, an elliptical shape having semi-major axes 100 60 pc is deduced. The major axis this inclined by about 40° respect to plane sky oriented perpendicular Bar. appears trace system stable x2 orbits predicted for barred potential. Sgr A⋆ displaced geometrical center symmetry...
This paper presents the High Frequency Instrument (HFI) data processing procedures for Planck 2018 release. Major improvements in mapmaking have been achieved since previous 2015 They enabled first significant measurement of reionization optical depth parameter using HFI data. an extensive analysis systematic effects, including use simulations to facilitate their removal and characterize residuals. The polarized data, which presented a number known problems release, are very significantly...
Using the Planck 2015 data release (PR2) temperature maps, we separate Galactic thermal dust emission from cosmic infrared background (CIB) anisotropies. For this purpose, implement a specifically tailored component-separation method, so-called generalized needlet internal linear combination (GNILC) which uses spatial information (the angular power spectra) to disentangle and CIB We produce significantly improved all-sky maps of emission, with reduced contamination, at 353, 545, 857 GHz. By...
The origin and possible universality of the stellar initial mass function (IMF) is a major issue in astrophysics. One main objectives Herschel Gould Belt Survey to clarify link between prestellar core (CMF) IMF. We present discuss derived from data for large population cores discovered with SPIRE PACS Aquila Rift cloud complex at d ~ 260 pc. detect total 541 starless entire ~11 deg^2 area field imaged 70-500 micron SPIRE/PACS. Most these appear be gravitationally bound, thus nature. Our...
(Abridged) We present the first public release of high-quality data products (DR1) from Hi-GAL, {\em Herschel} infrared Galactic Plane Survey. Hi-GAL is keystone a suite continuum surveys near-IR to radio, and covers five wavebands at 70, 160, 250, 350 500 micron, encompassing peak spectral energy distribution cold dust for 8 < T 50K. This inner Milky Way in longitude range 68{\deg} > l -70{\deg} |b|<1{\deg} latitude strip. Photometric maps have been produced with ROMAGAL pipeline, that...
Abstract The Near Infrared Camera for the James Webb Space Telescope (JWST) is delivering imagery that astronomers have hoped ever since JWST was proposed back in 1990s. In Commissioning Period extended from right after launch to early 2022 July, NIRCam has been subjected a number of performance tests and operational checks. camera exceeding prelaunch expectations virtually all areas, with very few surprises discovered flight. also delivered needed by Wavefront Sensing Team use aligning...
We analyse the Planck full-mission cosmic microwave background (CMB) temperature and E-mode polarization maps to obtain constraints on primordial non-Gaussianity (NG). compare estimates obtained from separable template-fitting, binned, modal bispectrum estimators, finding consistent values for local, equilateral, orthogonal amplitudes. Our combined analysis produces following results: f_NL^local = -0.9 +\- 5.1; f_NL^equil -26 47; f_NL^ortho - 38 24 (68%CL, statistical). These results include...