V. Charmandaris
A5061362016- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Spectroscopy Techniques in Biomedical and Chemical Research
- History and Developments in Astronomy
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- Spacecraft and Cryogenic Technologies
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Atmospheric aerosols and clouds
- Space Satellite Systems and Control
University of Crete
2015-2024
Foundation for Research and Technology Hellas
2011-2024
Athens State University
2024
University of Cyprus
2024
European University Cyprus
2022-2024
National Observatory of Athens
2014-2022
Computational Physics (United States)
2019
Observatoire de Paris
2007-2016
Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères
2004-2015
Center for Theoretical Physics
2006-2015
The Infrared Spectrograph (IRS) is one of three science instruments on the Spitzer Space Telescope. IRS comprises four separate spectrograph modules covering wavelength range from 5.3 to 38micron with spectral resolutions, R \~90 and 600, it was optimized take full advantage very low background in space environment. performing at or better than pre-launch predictions. An autonomous target acquisition capability enables locate mid-infrared centroid a source, providing information so that...
We present the deepest 100 to 500 μm far-infrared observations obtained with Herschel Space Observatory as part of GOODS-Herschel key program, and examine infrared (IR) 3–500 spectral energy distributions (SEDs) galaxies at 0 < z 2.5, supplemented by a local reference sample from IRAS, ISO, Spitzer, AKARI data. determine projected star formation densities their radio mid-IR continuum sizes.
The recently initiated Arecibo Legacy Fast ALFA (ALFALFA) survey aims to map 7000 square degrees of the high galactic latitude sky visible from Arecibo, providing a HI line spectral database covering redshift range between -1600 km/s and 18,000 with 5 resolution. Exploiting Arecibo's large collecting area small beam size, ALFALFA is specifically designed probe faint end mass function in local universe will provide census surveyed flux limits, making it especially useful synergy wide surveys...
Using data from the mid-infrared to millimeter wavelengths for individual galaxies and stacked ensembles at 0.5 < z 2, we derive robust estimates of dust masses (Mdust) main-sequence (MS) galaxies, which obey a tight correlation between star formation rate (SFR) stellar mass (M*), starbursting that fall outside relation. Exploiting gas-to-dust with metallicity (Mgas/Mdust–Z), use our measurements constrain gas content, CO-to-H2 conversion factors (αCO), efficiencies (SFE) these distant...
SMART is a software package written in IDL to reduce and analyze Spitzer data from all four modules of the Infrared Spectrograph, including peak‐up arrays. The designed make full use ancillary files generated Science Center pipeline so that it can either remove or flag artifacts corrupted maximize signal‐to‐noise ratio extraction routines. It be run both interactive batch modes. users guide will available for public release 2004 December. We briefly describe some main features SMART,...
We present 5-38 μm mid-infrared spectra at a spectral resolution of R ≈ 65-130 large sample 22 starburst nuclei taken with the Infrared Spectrograph (IRS) on board Spitzer Space Telescope. The show vast range SEDs. silicate absorption ranges from essentially no to heavily obscured systems an optical depth τ9.8 ~ 5. slopes can be used discriminate between and AGN powered sources. monochromatic continuum fluxes 15 30 enable remarkably accurate estimate total infrared luminosity starburst. find...
The Great Observatories All-Sky LIRG Survey (GOALS20 ) combines data from NASA's Spitzer Space Telescope,Chandra X-Ray Observatory,Hubble Telescope (HST), and Galaxy Evolution Explorer (GALEX) observatories, together with ground-based data, into a comprehensive imaging spectroscopic survey of over 200 low-redshift (z < 0.088), Luminous Infrared Galaxies (LIRGs). LIRGs are complete subset the IRAS Revised Bright Sample (RBGS), which comprises 629 extragalactic objects 60 μm flux densities...
We present spectra taken with the Infrared Spectrograph on Spitzer covering 5-38 micron region of ten Ultraluminous Galaxies (ULIRGs) found in IRAS Bright Galaxy Sample. Among BGS ULIRGs, we find a factor 50 spread rest-frame mid to far-infrared spectral slope. The 9.7 silicate optical depths range from less than 0.4 more 4.2, implying line sight extinctions A(V) ~ 8 - 78 mag. There is evidence for water ice and hydrocarbon absorption C2H2 HCN features four possibly six 10 indicating...
Abstract We propose in this White Paper a concept for space experiment using cold atoms to search ultra-light dark matter, and detect gravitational waves the frequency range between most sensitive ranges of LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment Dark Matter Gravity Exploration (AEDGE), will also complement other planned searches exploit synergies with wave detectors. give examples extended sensitivity matter offered...
We present a full high resolution SPIRE FTS spectrum of the nearby ultraluminous infrared galaxy Mrk231. In total 25 lines are detected, including CO J=5-4 through J=13-12, 7 rotational H2O, 3 OH+ and one line each H2O+, CH+, HF. find that excitation levels up to J=8 can be accounted for by UV radiation from star formation. However, approximately flat luminosity distribution over ladder above requires presence separate source highest lines. explore X-ray heating accreting supermassive black...
We present results from the deepest Herschel-PACS (Photodetector Array Camera and Spectrometer) far-infrared blank field extragalactic survey, obtained by combining observations of GOODS (Great Observatories Origins Deep Survey) fields PACS Evolutionary Probe (PEP) GOODS-Herschel key programmes. describe data reduction construction images catalogues. In parts GOODS-S field, catalogues reach 3-sigma depths 0.9, 0.6 1.3 mJy at 70, 100 160 um, respectively, resolve ~75% cosmic infrared...
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...
We use deep panchromatic datasets in the GOODS-N field, from GALEX to deepest Herschel far-infrared and VLA radio continuum imaging, explore, using mass-complete samples, evolution of star formation activity dust attenuation star-forming galaxies z~4. Our main results can be summarized as follows: i) slope SFR-M correlation is consistent with being constant, equal ~0.8 at least up z~1.5, while its normalization keeps increasing redshift; ii) for first time here we are able explore FIR-radio...
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around world to discuss exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter gravitational waves. primary objective was lay groundwork an international TVLBAI proto-collaboration. collaboration aims unite researchers different institutions strategize...
We present a new diagnostic diagram for mid-infrared spectra of infrared galaxies based on the equivalent width 6.2 μm PAH emission feature and strength 9.7 silicate feature. Based positions in this diagram, we classify into nine classes ranging from continuum-dominated AGN hot dust PAH-dominated starburst to absorption-dominated deeply obscured galactic nuclei. find that are systematically distributed along two distinct branches: one starburst-dominated nuclei spectra. The separation...
We present R ~ 600, 10-37 μm spectra of 53 ultraluminous infrared galaxies (ULIRGs), taken using the Infrared Spectrograph on board Spitzer. The show fine-structure emission lines neon, oxygen, sulfur, silicon, argon, chlorine, iron, and phosphorous; molecular hydrogen lines, C2H2, HCN, OH- absorption features. employ diagnostics based polycyclic aromatic hydrocarbon (PAH) features 9.7 silicate feature, to that from most ULIRGs is powered mostly by star formation, with only ~20% hosting an...
We take advantage of the sensitivity and resolution Herschel Space Observatory at 100 160 μm to directly image thermal dust emission investigate infrared luminosities (LIR) obscuration typical star-forming (L*) galaxies high redshift. Our sample consists 146 UV-selected with spectroscopic redshifts 1.5 ⩽ zspec < 2.6 in GOODS-North field. Supplemented deep Very Large Array Spitzer imaging, we construct median stacks positions these 24, 100, μm, 1.4 GHz. The comparison between stacked fluxes a...
We have surveyed a field covering 9.0 deg2 within the NOAO Deep Wide-Field Survey region in Bootes with Multiband Imaging Photometer on Spitzer Space Telescope (SST) to limiting 24 μm flux density of 0.3 mJy. Thirty-one sources from this survey F24 > 0.75 mJy that are optically very faint (R ≳ 24.5 mag) been observed low-resolution modules Infrared Spectrograph SST (IRS). Redshifts derived primarily strong silicate absorption features reported here for 17 these sources; 10 invisible 26 mag),...
Full low resolution (65
We present a {\em Spitzer}-based mid-infrared study of large sample Blue Compact Dwarf galaxies (BCD) using the Infrared Spectrograph (IRS), including first mid-IR spectrum IZw18, archetype for BCD class and among most metal poor known. show spectra Polycyclic Aromatic Hydrocarbon (PAH) emission in low-metallicity environment. find that equivalent widths (EW) PAHs at 6.2, 7.7, 8.6 11.2 $μ$m are generally weaker BCDs than typical starburst fine structure line ratio, [NeIII]/[NeII], has weak...
We report the spectroscopic detection of silicate emission at 10 and 18 μm in five PG quasars, first these two features galaxies outside Local Group. This finding is consistent with unification model for active galactic nuclei (AGNs), which predicts that an AGN torus seen pole-on should show a feature mid-infrared. The strengths detected range from 0.12 to 1.25 times continuum 0.20 0.79 μm. grain temperatures inferred ratio under assumption optically thin 140 220 K.
We reproduce the mid-infrared to radio galaxy counts with a new empirical model based on our current understanding of evolution main-sequence (MS) and starburst (SB) galaxies. rely simple Spectral Energy Distribution (SED) library Herschel observations: single SED for MS another one SB, getting warmer redshift. Our is able recent measurements performed Herschel, including per redshift slice. This agreement demonstrates power 2 Star-Formation Modes (2SFM) decomposition describing statistical...