A5002705377- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Detector Development and Performance
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Advanced X-ray Imaging Techniques
- Pulsars and Gravitational Waves Research
- History and Developments in Astronomy
- Astro and Planetary Science
- Scientific Research and Discoveries
- Planetary Science and Exploration
- Nuclear Physics and Applications
- Solar and Space Plasma Dynamics
- Relativity and Gravitational Theory
- Particle Accelerators and Free-Electron Lasers
Center for Astrophysics Harvard & Smithsonian
2015-2024
Harvard University
2007-2023
Smithsonian Astrophysical Observatory
2005-2021
Google (United States)
2020
Max Planck Society
2010-2019
Max Planck Institute for Astronomy
2019
University of California, Santa Cruz
2012
Harvard University Press
1993-2011
CFA Institute
2004-2010
Max Planck Innovation
2010
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates band from 3 to 79 keV, extending sensitivity of far beyond ∼10 keV cutoff achieved by all previous satellites. inherently low background associated with concentrating light enables probe hard sky a more than 100-fold improvement over collimated or coded mask instruments that have operated this bandpass. Using its unprecedented...
view Abstract Citations (1626) References (136) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Atlas of Quasar Energy Distributions Elvis, Martin ; Wilkes, Belinda J. McDowell, Jonathan C. Green, Richard F. Bechtold, Jill Willner, S. P. Oey, M. Polomski, Elisha Cutri, Roc We present an atlas the spectral energy distributions (SEDs) normal, nonblazar, quasars over whole available range (radio to 10 keV X-rays) electromagnetic spectrum. The primary (UVSX)...
The CIAO (<i>Chandra</i> Interactive Analysis of Observations) software package was first released in 1999 following the launch <i>Chandra</i> X-ray Observatory and is used by astronomers across world to analyze data as well from other telescopes. From earliest design discussions, planned a general-purpose scientific analysis system optimized for astronomy, consists mainly command line tools (allowing easy pipelining scripting) with parameter-based interface layered on flexible manipulation...
This paper proposes a simple, empirically derived, unifying structure for the inner regions of quasars. is constructed to explain broad absorption line (BAL) regions, narrow `associated' ultraviolet and X-ray warm absorbers (NALs); also found emission (BELR), several scattering features, including substantial fraction Iron-K line, bi-conical extended region (ENLR) structures seen on large kiloparsec scales in Seyfert images. Small extensions model allow luminosity dependent changes may UV...
We investigate models for the class of ultraluminous nonnuclear X-ray sources (i.e., compact [ULXs]) seen in a number galaxies and probably associated with star-forming regions. Models which emission is assumed to be isotropic run into several difficulties. In particular, formation sufficient numbers required ultramassive black hole binaries problematic, likely transient behavior resulting systems not good accord observation. The assumption mild beaming suggests instead that ULXs may...
The Spitzer-COSMOS survey (S-COSMOS) is a Legacy program (Cycles 2+3) designed to carry out uniform deep of the full 2 sq deg COSMOS field in all seven Spitzer bands (3.6, 4.5, 5.6, 8.0, 24.0, 70.0, 160.0 u). This paper describes parameters, mapping strategy, data reduction procedures, achieved sensitivities date, and complete set for future reference. We show that observed infrared backgrounds S-COSMOS are within 10% predicted background levels. fluctuations at 24u have been measured do not...
We present the final results of a ROSAT PSPC program to study soft X-ray emission properties complete sample low-z quasars. This includes all 23 quasars from Bright Quasar Survey with z ≤ 0.400 and N<1.9×1020 cm-2. Pointed observations were made for quasars, yielding high signal-to-noise (S/N) spectra most objects, which allowed an accurate determination spectral shape. The following main obtained:
We propose a ‘two-stage’ model for the effects of feedback from bright quasar on cold gas in galaxy. It is difficult winds or other forms near accretion disc to directly impact (let alone blow out galaxy) dense molecular clouds at ∼kpc. However, if such can drive weak wind outflow hot, diffuse interstellar medium (a relatively ‘easy’ task), then wake an passing over cloud, combination instabilities and simple pressure gradients will cloud material effectively expand direction perpendicular...
The COSMOS-Legacy survey is a 4.6 Ms Chandra program that has imaged 2.2 deg$^2$ of the COSMOS field with an effective exposure $\simeq$160 ks over central 1.5 and $\simeq$80 in remaining area. combination 56 new observations, obtained as X-ray Visionary Project, previous C-COSMOS survey. We describe reduction analysis observations properties 2273 point sources detected above spurious probability 2$\times 10^{-5}$. also present updated data. whole includes 4016 (3814, 2920 2440 full, soft...
The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, Chandra} program that has imaged the central 0.5 sq.deg of field (centered at 10h, +02deg) with an effective exposure ~160ksec, and outer 0.4sq.deg. area ~80ksec. limiting source detection depths are 1.9e-16 erg cm(-2) s(-1) in Soft (0.5-2 keV) band, 7.3e(-16) cm^-2 s^-1 Hard (2-10 5.7e(-16) Full (0.5-10 band. Here we describe strategy, design execution C-COSMOS survey, present catalog 1761 point sources detected probability being...
view Abstract Citations (494) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-ray studies of quasars with the Einstein Observatory. Tananbaum, H. ; Avni, Y. Branduardi, G. Elvis, M. Fabbiano, Feigelson, E. Giacconi, R. Henry, J. P. Pye, Soltan, A. Zamorani, Results an investigation properties conducted using Observatory (HEAO 2) are reported. The positions, fluxes and luminosities 35 known were observed by high-resolution imaging detector...
Bolometric luminosities and Eddington ratios of both X-ray selected broad-line (Type-1) narrow-line (Type-2) AGN from the XMM-Newton survey in COSMOS field are presented. The sample is composed by 929 (382 Type-1 547 Type-2 AGN) it covers a wide range redshifts, absorbing column densities. About 65% sources spectroscopically identified as either or (83% 52% respectively), while accurate photometric redshifts available for rest sample. study such large with high quality multi-wavelength...
We present photometric redshifts and spectral energy distribution (SED) classifications for a sample of 1542 optically identified sources detected with XMM in the COSMOS field. Our template fitting classifies 46 as stars 464 nonactive galaxies, while remaining 1032 require templates an active galactic nucleus (AGN) contribution. High accuracy derived was accomplished result (1) photometry up to 30 bands high-significance detections, (2) new set SED templates, including 18 hybrids covering...
We present the first set of XMM-Newton EPIC observations in 2 square degree COSMOS field. The strength project is unprecedented combination a large solid angle and sensitivity over whole multiwavelength spectrum. are very efficient localizing identifying active galactic nuclei (AGN) clusters as well groups galaxies. One primary goals Cosmos survey to study co-evolution function their environment Cosmic web. Here we log observations, images summary research highlights for pass 25 pointings...
ABSTRACT We investigate if the discrepancy between estimates of total baryon mass fraction obtained from observations cosmic microwave background (CMB) and galaxy groups/clusters persists when a large sample groups is considered. To this purpose, 91 candidate X-ray groups/poor clusters at redshift 0.1 ⩽ z 1 are selected COSMOS 2 deg survey, based only on their luminosity extent. This complemented by 27 nearby with robust, analogous determination stellar inside R 500 . The 118 spans range in...
The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, program that has imaged the central 0.9 deg2 of field down to limiting depths 1.9 × 10−16 erg cm−2 s−1 in soft (0.5–2 keV) band, 7.3 hard (2–10 and 5.7 full (0.5–10 band. In this paper we report i, K, 3.6 μm identifications 1761 X-ray point sources. We use likelihood ratio technique derive association optical/infrared counterparts for 97% For most remaining 3%, presence multiple or faintness possible counterpart prevented unique...
ABSTRACT We present the catalog of optical and infrared counterparts Chandra COSMOS-Legacy Survey, a 4.6 Ms program on 2.2 deg 2 COSMOS field, combination 56 new overlapping observations obtained in Cycle 14 with previous C-COSMOS survey. In this Paper we report i , K 3.6 μ m identifications 2273 X-ray point sources detected observations. use likelihood ratio technique to derive association optical/infrared (IR) for 97% sources. also update information 1743 C-COSMOS, using not available when...
Exploring supermassive black hole (SMBH) populations in protoclusters offers valuable insights into how environment affects SMBH growth. However, research on active galactic nuclei (AGN) within these areas is still limited by the small number of known at high redshift and availability associated deep X-ray observations. In order to understand different environments affect AGN triggering growth redshift, we investigated population field MUSE Quasar Nebula 01 (MQN01) protocluster z ≃ 3.25....
We present a study of the variations in absorbing column density 25 X-ray-defined Seyfert 2 galaxies, as inferred from hard X-ray observations, on timescales months to several years. show that significant variation NH (from 20% 80%) is observed almost all (22 25) sources with multiple although absorption never vanishes. For subsample 11 at least five times, typical time, defined by structure function, less than 1 yr for both heavily absorbed (NH ~ 1023 cm-2) and moderately 1022 sources....
Measurements of X-ray scaling laws are critical for improving cosmological constraints derived with the halo mass function and understanding physical processes that govern heating cooling intracluster medium. In this paper, we use a sample 206 selected galaxy groups to investigate relation between luminosity (Lx) (M00) where M200 is via stacked weak gravitational lensing. This work draws upon broad array multi-wavelength COSMOS observations including 1.64 square degrees contiguous imaging...
We present multiple Chandra and XMM-Newton observations of the type 1.8 Seyfert Galaxy NGC 1365, which shows most dramatic X-ray spectral changes observed so far in an AGN: source switched from reflection dominated to transmission back just 6 weeks. During this time soft thermal component, arising a ~1 kpc region around center, remained constant. The component is constant at all timescales, its high flux relative primary implies presence thick gas covering large fraction solid angle. gas,...
<i>Context. <i/>The COSMOS survey is a multiwavelength aimed to study the evolution of galaxies, AGN and large scale structures. Within this XMM-COSMOS powerful tool detect galaxy clusters. The deep X-ray over full 2 deg<sup>2<sup/> area. It consists 55 XMM-<i>Newton<i/> pointings for total exposure ~1.5 Ms with an average vignetting-corrected depth 40 ks across field view sky coverage 2.13 deg<sup>2<sup/>.<i>Aims. <i/>We present catalogue point-like sources detected EPIC CCD cameras,...
view Abstract Citations (365) References (75) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Constraints on Quasar Accretion Disks from the Optical/Ultraviolet/Soft X-Ray Big Bump Czerny, Bozena ; Elvis, Martin The simplest accretion-disk models have difficulties explaining optical/UV/soft-X-ray 'big bump' in quasars. Here more realistic are investigated, incorporating opacity and inclination effects while retaining an analytic form for ease of computation....