- ID:
- ivo://CDS.VizieR/J/MNRAS/490/243
- Title:
- ELAIS N1 field uGMRT 400MHz source catalog
- Short Name:
- J/MNRAS/490/243
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Understanding the low-frequency radio sky in depth is necessary to subtract foregrounds in order to detect the redshifted 21 cm signal of neutral hydrogen from the cosmic dawn, the epoch of reionization and the post-reionization era. In this second paper of the series, we present the upgraded Giant Metrewave Radio Telescope (uGMRT) observation of the ELAIS N1 field made at 300-500MHz. The image covers an area of ~1.8deg^2^ and has a central background rms noise of ~15uJy/beam. We present a radio source catalogue containing 2528 sources (with flux densities >100uJy) and normalized source counts derived from that. A detailed comparison of detected sources with previous radio observations is shown. We discuss flux-scale accuracy, positional offsets, spectral index distribution and correction factors in source counts. The normalized source counts are in agreement with previous observations of the same field, as well as model source counts from the Square Kilometre Array Design Study simulation. It shows a flattening below ~1mJy that corresponds to a rise in populations of star-forming galaxies and radio-quiet active galactic nuclei. For the first time, we estimate the spectral characteristics of the angular power spectrum or multi-frequency angular power spectrum of diffuse Galactic synchrotron emission over a wide frequency bandwidth of 300-500MHz from radio interferometric observations. This work demonstrates the improved capabilities of the uGMRT.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/MNRAS/358/333
- Title:
- ELAIS optical ident. at 15um & 1.4GHz
- Short Name:
- J/MNRAS/358/333
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the multi-wavelength properties and catalogue of the 15{mu}m and 1.4GHz radio sources detected in the European Large Area ISO Survey (ELAIS) areas N1 and N2. Using the optical data from the Wide Field Survey we use a likelihood ratio method to search for the counterparts of the 1056 and 691 sources detected at 15{mu}m and 1.4GHz, respectively, down to flux limits of S_15_=0.5mJy and S_1.4_GHz=0.135mJy.
- ID:
- ivo://nasa.heasarc/elaiss1xmm
- Title:
- ELAIS S1 Field XMM-Newton X-Ray Source Catalog
- Short Name:
- ELAISS1XMM
- Date:
- 27 Sep 2024
- Publisher:
- NASA/GSFC HEASARC
- Description:
- The formation and evolution of cosmic structures can be probed by studying the evolution of the luminosity function of the Active Galactic Nuclei (AGNs), galaxies and clusters of galaxies and of the clustering of the X-ray active Universe, compared to the IR-UV active Universe. To this purpose, the authors have surveyed with XMM-Newton the central ~0.6 deg<sup>2</sup> region of the ELAIS-S1 field down to flux limits of ~5.5 x 10<sup>-16</sup> erg cm<sup>-2</sup> s<sup>-1</sup> (0.5-2 keV, soft band, S), ~2 x 10<sup>-15</sup> erg cm<sup>-2</sup> s<sup>-1</sup> (2-10 keV, hard band, H), and ~4 x 10<sup>-15</sup> erg cm<sup>-2</sup> s<sup>-1</sup> (5-10 keV, ultra-hard band, HH). They present here the analysis of the XMM-Newton observations, the number counts in different energy bands and the clustering properties of the X-ray sources. They have detected a total of 478 sources, 395 and 205 of which detected in the S and H bands respectively. They identified 7 clearly extended sources and estimated their redshift through X-ray spectral fits with thermal models. In four cases the redshift is consistent with z = 0.4, so they may have detected a large scale structure formed by groups and clusters of galaxies through their hot intra-cluster gas emission. The relative density of the S band sources is higher near the clusters and groups at z ~ 0.4 and extends toward East and the South/West. This suggests that the structure is complex, with a size comparable to the full XMM-Newton field. Conversely, the highest relative source densities of the H band sources are located in the central-west region of the field. The mosaic of four partially overlapping deep XMM-Newton pointings covers a large (~0.6 deg<sup>2</sup>) and contiguous area of the ELAIS-S1 region. The pointings are named <pre> ELAIS-S1-A (RA=8.91912, DE=-43.31344, J2000), ELAIS-S1-B (RA=8.92154, DE=-43.65575, J2000), ELAIS-S1-C (RA=8.42195, DE=-43.30488, J2000) and ELAIS-S1-D (RA=8.42375, DE=-43.65327, J2000). </pre> The X-ray observations were performed on May 2003 through July 2003 with XMM-Newton's European Photon Imaging Camera (EPIC) and two MOS-CCD cameras. This table was created by the HEASARC in June 2008 based on the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/457/501">CDS Catalog J/A+A/457/501</a> files elaisxmm.dat and catalog.dat. This is a service provided by NASA HEASARC .
- ID:
- ivo://nasa.heasarc/elaiss1oid
- Title:
- ELAIS S1 Field X-Ray Source Optical/IR Identifications Catalog
- Short Name:
- ELAISS1OID
- Date:
- 27 Sep 2024
- Publisher:
- NASA/GSFC HEASARC
- Description:
- This table contains the optical identifications and a multi-band catalog of a sample of 478 X-ray sources detected in the XMM-Newton and Chandra surveys of the central 0.6 deg<sup>2</sup> of the ELAIS-S1 field. The most likely optical/infrared counterpart of each X-ray source was identified using the chance coincidence probability in the R and IRAC 3.6 micron bands.This method was complemented by the precise positions obtained through Chandra observations. The authors were able to associate a counterpart to each X-ray source in the catalogue. Approximately 94% of them are detected in the R band, while the remaining are blank fields in the optical down to R ~ 24.5, but have a near-infrared counterpart detected by IRAC within 6 arcsec of the XMM-Newton centroid. The multi-band catalog, produced using the positions of the identified optical counterparts, contains photometry in ten photometric bands, from B to the MIPS 24 micron band. The spectroscopic follow-up allowed us to determine the redshift and classification for 237 sources (~ 50% of the sample) brighter than R = 24. The spectroscopic redshifts were complemented by reliable photometric redshifts for 68 sources. The authors classified 47% of the sources with spectroscopic redshift as broad-line active galactic nuclei (BL AGNs) with z = 0.1-3.5, while sources without broad-lines (NOT BL AGNs) are about 46% of the spectroscopic sample and are found up to z = 2.6. The remaining fraction is represented by extended X-ray sources and stars. The authors spectroscopically identified 11 type 2 QSOs among the sources with F(2-10 keV)/F(R) > 8, with redshift between 0.9 and 2.6, high 2-10 keV luminosity (log L(2-10 keV) >= 43.8 erg/s) and hard X-ray colors suggesting large absorbing columns at the rest frame (log N<sub>H</sub> up to 23.6 cm<sup>-2</sup>). BL AGNs show on average blue optical-to-near-infrared colors, softer X-ray colors and X-ray-to-optical colors typical of optically selected AGNs. Conversely, narrow-line sources show redder optical colors, harder X-ray flux ratio and span a wider range of X-ray-to-optical colors. On average the Spectral Energy Distributions (SEDs) of high-luminosity BL AGNs resemble the power-law typical of unobscured AGNs. The SEDs of NOT BLAGNs are dominated by the galaxy emission in the optical/near-infrared, and show a rise in the mid-infrared which suggests the presence of an obscured active nucleus. The authors have used the infrared-to-optical colors and near-infrared SEDs to infer the properties of the AGN host galaxies. Identifications and photometric parameters for 478 sources detected by XMM-Newton in the ELAIS-S1 field are given. For each source, the X-ray positions and fluxes, optical position and photometry, Spitzer IRAC and MIPS 24 micron positions and fluxes, spectroscopic redshift where available, photometric redshift and SED shape classification are given. This table was created by the HEASARC in December 2008 based on the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/488/417">CDS Catalog J/A+A/488/417</a> file catalog.dat. This is a service provided by NASA HEASARC .
5435. EL COSMOS DR1 catalogue
- ID:
- ivo://lam.cesam.aspic/el_cosmos_dr1/q/cone
- Title:
- EL COSMOS DR1 catalogue
- Short Name:
- ELCOSMOS1 SCS
- Date:
- 28 Apr 2022 21:55:18
- Publisher:
- The CeSAM VO team
- Description:
- Modeled magnitudes and emission line fluxes of COSMOS2015 sources
5436. EL COSMOS DR1 spectra
- ID:
- ivo://lam.cesam.aspic/el_cosmos_dr1/q/ssa
- Title:
- EL COSMOS DR1 spectra
- Short Name:
- ELCOSMOS1 SSAP
- Date:
- 28 Apr 2022 21:55:18
- Publisher:
- The CeSAM VO team
- Description:
- Synthetic spectra of COSMOS2015 sources
- ID:
- ivo://CDS.VizieR/J/ApJ/795/105
- Title:
- Electromagnetic follow-up with LIGO/Virgo
- Short Name:
- J/ApJ/795/105
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We anticipate the first direct detections of gravitational waves (GWs) with Advanced LIGO and Virgo later this decade. Though this groundbreaking technical achievement will be its own reward, a still greater prize could be observations of compact binary mergers in both gravitational and electromagnetic channels simultaneously. During Advanced LIGO and Virgo's first two years of operation, 2015 through 2016, we expect the global GW detector array to improve in sensitivity and livetime and expand from two to three detectors. We model the detection rate and the sky localization accuracy for binary neutron star (BNS) mergers across this transition. We have analyzed a large, astrophysically motivated source population using real-time detection and sky localization codes and higher-latency parameter estimation codes that have been expressly built for operation in the Advanced LIGO/Virgo era. We show that for most BNS events, the rapid sky localization, available about a minute after a detection, is as accurate as the full parameter estimation. We demonstrate that Advanced Virgo will play an important role in sky localization, even though it is anticipated to come online with only one-third as much sensitivity as the Advanced LIGO detectors. We find that the median 90% confidence region shrinks from ~500 deg^2^ in 2015 to ~200 deg^2^ in 2016. A few distinct scenarios for the first LIGO/Virgo detections emerge from our simulations.
- ID:
- ivo://CDS.VizieR/J/A+A/585/A118
- Title:
- Electron collisional excitation of NiXII
- Short Name:
- J/A+A/585/A118
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present new large-scale R-matrix (up to n=4) scattering calculations for the electron collisional excitation of Cl-like NiXII. We used the intermediate-coupling frame transformation method. We compare predicted and observed line intensities using laboratory and solar spectra, finding good agreement for all the main soft X-ray lines. With the exception of the three strongest transitions, large discrepancies with previous estimates are found, especially for the decays from the lowest 3s2 3p4 3d levels. This includes the forbidden UV lines. The atomic data for the n = 4 levels are the first to be calculated. We revise previous experimental energies, and suggest several new identifications. We point out the uncertainty in the wavelength of the 3s2 3p5 2P1/2 3s2 3p4 3d 2D3/2 transition, which is important for density diagnostics.
- ID:
- ivo://CDS.VizieR/J/A+A/446/1185
- Title:
- Electron collisions with Fe IV ions
- Short Name:
- J/A+A/446/1185
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Effective collision strengths are presented for transitions from the 16 states of the 3d(5) configuration to the higher lying states belonging to the 3d(4)4s and 3d(4)4p configurations of Fe IV. Collision strength calculations performed with 108 coupled states (in LS-coupling) using the parallel R-matrix code PRMAT are used to determine the effective collision strengths by averaging them over a Maxwellian temperature distribution for the electrons. Each of the LS term level is assigned a label ranging from 1 to 108. Note; 1 to 16 refers to states associated with the 3d(5) configuration; 6S, 4G, 4P, 4D, 2I, 2D3, 2F2, 4F, 2H, 2G2, 2F1, 2S, 2D2, 2G, 2P and 2D1. Effective collision strengths data for 11 temperatures are presented (non-zero values) for electron temperatures ranging from ~2000 to 1000000K (i.e. log10(T)=3.3 to log10(T)=6.0).
- ID:
- ivo://CDS.VizieR/J/A+A/583/A82
- Title:
- Electron-impact excitation for Hydrogen-like ions
- Short Name:
- J/A+A/583/A82
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present our calculated data including energy levels and lifetimes (in table1), radiative rates, oscillator strengths and line strengths (in table2), collision strengths (in table3), and effective collision strengths (in table4) for all the transitions among 36 fine-structure levels from n<=6 configurations in H-like ions with 13<=Z<=42.