A5039844544- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Astro and Planetary Science
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Particle Accelerators and Free-Electron Lasers
- Phase Equilibria and Thermodynamics
- Superconducting and THz Device Technology
- CCD and CMOS Imaging Sensors
- History and Developments in Astronomy
- Particle accelerators and beam dynamics
- Medical Imaging Techniques and Applications
- Pulsars and Gravitational Waves Research
- GNSS positioning and interference
- Nuclear Physics and Applications
Ames Research Center
2018-2024
Space Telescope Science Institute
2023-2024
National Aeronautics and Space Administration
2013-2023
Universities Space Research Association
2018-2023
Michigan Science Center
2023
California Institute of Technology
2006-2017
Infrared Processing and Analysis Center
2009-2017
Instituto de Astrofísica de Canarias
2001-2016
Universidad de La Laguna
2016
Scuola Internazionale Superiore di Studi Avanzati
1996-2008
Selection of active galactic nuclei (AGNs) in the infrared facilitates discovery AGNs whose optical emission is extinguished by dust.In this paper, we use Spitzer Space Telescope First Look Survey (FLS) to assess fraction with mid-infrared (MIR) luminosities that are comparable quasars and missed quasar surveys because dust obscuration.We begin using Sloan Digital Sky (SDSS) database identify 54 within 4 deg 2 extragalactic FLS.These occupy a distinct region MIR color space virtue their...
Deep extragalactic surveys with ISOCAM revealed the presence of a large density faint mid-infrared (MIR) sources. We have computed 15 μm integrated galaxy light produced by these galaxies above sensitivity limit 50 μJy. It sets lower to background () nW m-2 sr-1. The redshift distribution is inferred from spectroscopically complete sample in Hubble Field North (HDFN). peaks around 0.8 agreement studies other fields. rest-frame and bolometric infrared (8–1000 μm) luminosities are using...
Using very deep Spitzer/MIPS 24 micron observations, we present an analysis of the bolometric luminosities (L[bol]) and UV extinction properties more than 200 spectroscopically identified, optically selected (UGR) z~2 galaxies in GOODS-N field. The large spectroscopic sample is supplemented with near-IR (BzK/DRG) submm sources at similar redshifts same field, providing a representative collection relatively massive (M*>1e10 Msun) high redshifts. We focus on redshift range 1.5-2.6, where MIPS...
We present the stellar calibrator sample and conversion from instrumental to physical units for 24 micron channel of Multiband Imaging Photometer Spitzer (MIPS). The primary calibrators are A stars, calibration factor based on those stars is 4.54*10^{-2} MJy sr^{-1} (DN/s)^{-1}, with a nominal uncertainty 2%. discuss data-reduction procedures required attain this accuracy; without these procdures, obtained using automated pipeline at Science Center 1.6% +/- 0.6% lower. extend work predict...
Using the Spitzer Space Telescope and Very Large Array (VLA), we present first direct evidence that well-known far-infrared/radio correlation is valid to cosmologically significant redshift. We also confirm, with improved statistics compared previous surveys, a similar result for mid-IR/radio correlation. explore dependence of monochromatic q24 q70 on z. The results were obtained by matching sources at 24 70 μm VLA 1.4 GHz microjansky radio First Look Survey (FLS). Spectroscopic redshifts...
We discuss the constraints set on galaxy evolution by a variety of data from deep extragalactic surveys performed in mid-IR and far-IR with Infrared Space Observatory millimetric telescopes at longer wavelengths. These observations indicate extremely high rates for IR galaxies, exceeding those measured galaxies other wavelengths comparable or larger than observed quasars. also match modelled integrated emission any redshifts spectral intensity background (CIRB), as further constraint. The...
The absolute calibration and characterization of the Multiband Imaging Photometer for Spitzer (MIPS) 70 μm coarse‐ fine‐scale imaging modes are presented based on over 2.5 yr observations. Accurate photometry (especially faint sources) requires two simple processing steps beyond standard data reduction to remove long‐term detector transients. Point‐spread function (PSF) fitting is found give more accurate flux densities than aperture photometry. Based PSF photometry, factor shows no strong...
We present optical spectroscopy of a sample 77 luminous active galactic nuclei (AGNs) and quasars selected on the basis their mid-infrared colors. Our objects are from Spitzer Extragalactic First Look Survey SWIRE XMM-Newton Large-Scale Structure (XMM-LSS) fields, with typical 24 μm flux density 5 mJy. The median redshift is 0.6, range ∼0.05-4. Only 33% (25 out 77) these normal type 1 quasars, no obscuration. Forty-four percent (34 2 objects, high-ionization, narrow emission lines, 14% (11...
We present the mid-infrared spectra obtained with Spitzer IRS for 52 sources, selected as infrared luminous, z ≳ 1 candidates in Extragalactic First Look Survey. The sample selection criteria are f24 μm 0.9 mJy, νfν(24 μm)/νfν(8 μm) 3.16, and μm)/νfν(0.7 10. Of spectra, 47 (90%) produced measurable redshifts based solely on mid-IR spectral features, 35/47 (74%) at 1.5 ≲ 3.2. Keck spectroscopy of a subsample (17/47) agrees redshift measurements. observed fall into three categories: (1) 33%...
We describe the Herschel Virgo Cluster Survey (HeViCS) and first data obtained as part of Science Demonstration Phase (SDP). The cover a central 4x4 sq deg region cluster. use SPIRE PACS photometry to produce 100, 160, 250, 350 500 micron luminosity functions (LFs) for optically bright galaxies that are selected at detected in all bands. compare these LFs with those previously derived using IRAS, BLAST Herschel-ATLAS data. do not have large numbers faint or examples very luminous seen...
We describe the European Large Area ISO Survey (ELAIS). ELAIS was largest single Open Time project conducted by ISO, mapping an area of 12 deg2 at 15 μm with ISOCAM and 90 ISOPHOT. Secondary surveys in other bands were undertaken team within fields primary survey, 6 being covered 6.7 1 175 μm. This paper discusses goals techniques employed its construction, as well presenting details observations carried out, data from which are now public domain. outline 'preliminary analysis' led to...
view Abstract Citations (177) References (109) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Velocity Dispersions and X-Ray Temperatures of Galaxy Clusters Girardi, M. ; Fadda, D. Giuricin, G. Mardirossian, F. Mezzetti, Biviano, A. Using a large well-controlled sample clusters galaxies, we investigate the relation between cluster velocity dispersions X-ray temperatures intracluster gas. The selection is based on nonparametric methods. In particular, present...
We present an objective and automated procedure for detecting clusters of galaxies in imaging galaxy surveys. Our Voronoi Galaxy Cluster Finder (VGCF) uses positions magnitudes to find determine their main features: size, richness contrast above the background. The VGCF tessellation evaluate local density identify as significative fluctuations significance threshold needs be set by user, but experimenting with different choices is very easy since it does not require a whole new run...
We report the initial results from a Spitzer GO-1 program to obtain low-resolution, mid-infrared spectra of infrared luminous galaxies at z ~ 1-2. This paper presents eight sources observed with Infrared Spectrograph (IRS). Of spectra, six have mid-IR spectral features, either emission polycyclic aromatic hydrocarbon (PAH) or silicate absorption. Based on these inferred redshifts are in range 1.8-2.6. The remaining two detect only strong continua and thus do not yield redshift information....
We present mid-IR spectral decomposition of a sample 48 Spitzer-selected ULIRGs spanning z~1-3 and likely L_IR~10^12-10^13Lsun. Our study aims at quantifying the star-formation AGN processes in these sources which recent results suggest have evolved strongly between observed epoch today. To do this, we contribution PAH emission, continuum, extinction. About 3/4 our are continuum- (i.e. AGN) dominated sources, but ~60% show suggesting presence activity. These redder colors than typical...
We present the final band-merged European Large-Area ISO Survey (ELAIS) Catalogue at 6.7, 15, 90 and 175 μm, associated data U, g′, r′, i′, Z, J, H, K 20 cm. The origin of survey, infrared radio observations, data-reduction optical identifications are briefly reviewed, a summary area covered completeness limit for each band is given. A detailed discussion band-merging association strategy total consists 3762 sources. 23 per cent 15-μm sources 75 6.7-μm stars. For extragalactic observed in...
We describe the absolute calibration of Multiband Imaging Photometer for Spitzer (MIPS) 160 μm channel. After on‐orbit discovery a near‐IR ghost image that dominates signal sources hotter than about 2000 K, we adopted strategy utilizing asteroids to transfer calibrations MIPS 24 and 70 channels Near‐simultaneous observations at all three wavelengths are taken, photometry two shorter is fit using standard thermal model. The flux density predicted from those fits compared with observed derive...
We present 70 and 160 μm observations from the Spitzer extragalactic First Look Survey (xFLS). The data reduction techniques methods for producing co-added mosaics source catalogs are discussed. Currently, 26% of sample 49% μm–selected sources have redshifts. majority with redshifts star-forming galaxies at z < 0.5, while about 5% infrared colors consistent active galactic nuclei. observed agree spectral energy distributions (SEDs) local previously determined IRAS Infrared Space Observatory...
By combining <i>Herschel<i/>-SPIRE observations obtained as part of the <i>Herschel<i/> Virgo Cluster Survey with 21 cm Hi data from literature, we investigate role cluster environment on dust content spiral galaxies. We show for first time that extent disk is significantly reduced in Hi-deficient galaxies, following remarkably well observed "truncation" disk. The ratio submillimetre-to-optical diameter correlates Hi-deficiency, suggesting able to strip gas. These results provide important...
By combining the 0.12 deg2 F814W Hubble Space Telescope (HST) and Spitzer MIPS 24 μm imaging in First Look Survey (FLS), we investigate properties of interacting merging mid-infrared bright faint sources at 0.2 ≤ z 1.3. We find a marginally significant increase pair fraction for detected, optically selected close pairs, with 0.25 ± 0.10 ~ 1, contrast to 0.11 0.08 0.4, while galaxies below our detection limit show consistent zero all redshifts. In addition, detected fluxes ≥0.1 mJy are on...
The Herschel Lensing Survey (HLS) will conduct deep PACS and SPIRE imaging of ~40 massive clusters galaxies. strong gravitational lensing power these enable us to penetrate through the confusion noise, which sets ultimate limit on our ability probe Universe with Herschel. Here, we present an overview survey a summary major results from Science Demonstration Phase (SDP) observations Bullet Cluster (z=0.297). SDP data are rich, allowing study not only background high-redshift galaxies (e.g.,...