- ID:
- ivo://CDS.VizieR/J/A+A/409/147
- Title:
- J magnitude of IC 348 brown dwarfs
- Short Name:
- J/A+A/409/147
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We use a deep near-infrared census of the young stellar cluster IC 348 to construct and analyze its luminosity function. Our mosaic image of IC 348 covers the full extent of the cluster with a completeness limit of J~19.5 and is therefore sensitive for 2Myr old cluster members with masses as low as M>=0.005M_{sun}_ or the mean extinction of the known cluster members (A_V_~3.5mag).
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Search Results
- ID:
- ivo://CDS.VizieR/II/345
- Title:
- JMDC : JMMC Measured Stellar Diameters Catalogue
- Short Name:
- II/345
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalog lists all measurements of stellar apparent diameters made with "direct" techniques: optical interferometry, intensity interferometry and lunar occultations that have been published since the first experiments by Michelson.
- ID:
- ivo://CDS.VizieR/J/A+A/612/L6
- Title:
- j-M law from dwarf to massive spirals
- Short Name:
- J/A+A/612/L6
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In a {LAMBDA} CDM Universe, the specific stellar angular momentum (j*) and stellar mass (M*) of a galaxy are correlated as a consequence of the scaling existing for dark matter haloes (jh{prop.to}2/3). The shape of this law is crucial to test galaxy formation models, which are currently discrepant especially at the lowest masses, allowing to constrain fundamental parameters, such as, for example, the retained fraction of angular momentum. In this study, we accurately determine the empirical j*-M* relation (Fall relation) for 92 nearby spiral galaxies (from S0 to Irr) selected from the Spitzer Photometry and Accurate Rotation Curves (SPARC) sample in the unprecedented mass range 7<~logM*/M_{sun}_<~11.5. We significantly improve all previous estimates of the Fall relation by determining j* profiles homogeneously for all galaxies, using extended HI rotation curves, and selecting only galaxies for which a robust j* could be measured (converged j*(<R) radial profile). We find the relation to be well described by a single, unbroken power-law j*{alpha}M*^{alpha}^ over the entire mass range, with {alpha}=0.55+/-0.02 and orthogonal intrinsic scatter of 0.17+/-0.01dex. We finally discuss some implications of this fundamental scaling law for galaxy formation models and, in particular, the fact that it excludes models in which discs of all masses retain the same fraction of the halo angular momentum.
- ID:
- ivo://CDS.VizieR/II/300
- Title:
- JMMC Stellar Diameters Catalogue - JSDC
- Short Name:
- II/300
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue contains stellar angular diameter estimate for bright stars, complete for all stars with Hipparcos parallaxes. The JMMC Calibrator Workgroup has long developed methods to estimate the angular diameter of stars, and provides this expertise in the SearchCal software (http://www.jmmc.fr/searchcal). "SearchCal" creates a dynamical catalogue of stars suitable to calibrate Optical Long-Baseline Interferometry (OLBI) observations from on-line queries of CDS catalogues, according to observational parameters. In essence, SearchCal is limited only by the completeness of the stellar catalogues it uses, and in particular is not limited in magnitude. SearchCal being an application centered on OLBI peculiar purposes, it appeared useful to publish the estimated angular diameters of all stars with known parallaxes in a static catalogue. The present catalogue of stellar angular diameters has been obtained from an automated SearchCal results aggregation on the whole celestial sphere. For each star, the value of the limb-darkened angular diameters are computed using a surface brightness method and calibrations for (B-V), (V-R) and (V-K) color indexes. Stars whose angular diameters estimated from the various color indexes are not comparable, are rejected, and a reliable error on the estimated diameter is computed (1). For details of the method see Bonneau et al. (2006A&A...456..789B). To avoid specific confusion problems, spectroscopic binaries in the 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix et al., 2009, Cat. B/sb9) or close visual binaries with a separation of less than 2 arc seconds in the Washington Visual Double Star Catalog (Mason et al., 2001, Cat. B/wds) have been filtered out.
- ID:
- ivo://CDS.VizieR/II/346
- Title:
- JMMC Stellar Diameters Catalogue - JSDC. Version 2
- Short Name:
- II/346
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue contains stellar angular diameter estimates for nearly all the stars of the Hipparcos and Tycho catalogue that have an associated spectral type in Simbad/CDS. The median error on the diameters is around 1.5%, with possible biases of around ~2%. For each object, the limb-darkened diameter retained is the mean value of several estimates performed using different couples of photometries. The chi-square representing the dispersion between these values is also given (it is below 2 for ~400000 stars). An additional flag signals stars that could represent a risk if chosen as calibrators for Optical Long-Baseline Interferometry, independently of the correctness of their apparent diameter estimate. This catalog replaces the catalog II/300/jsdc .
- ID:
- ivo://CDS.VizieR/J/ApJ/868/133
- Title:
- j-M relation for disk and bulge type galaxies
- Short Name:
- J/ApJ/868/133
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We show that the stellar specific angular momentum j_*_, mass M_*_, and bulge fraction {beta}_*_ of normal galaxies of all morphological types are consistent with a simple model based on a linear superposition of independent disks and bulges. In this model, disks and bulges follow scaling relations of the form j_*_d{propto}M_*_d^{alpha}^ and j_*_b{propto}M_*_b^{alpha}^ with {alpha}=0.67+/-0.07 but offset from each other by a factor of 8+/-2 over the mass range 8.9<=log(M_*/M_{sun})<=11.8. Separate fits for disks and bulges alone give {alpha}=0.58+/-0.10 and {alpha}=0.83+/-0.16, respectively. This model correctly predicts that galaxies follow a curved 2D surface in the 3D space of log(j_*_), log(M_*_), and {beta}_*_. We find no statistically significant indication that galaxies with classical and pseudo bulges follow different relations in this space, although some differences are permitted within the observed scatter and the inherent uncertainties in decomposing galaxies into disks and bulges. As a byproduct of this analysis, we show that the j_*_-M_*_ scaling relations for disk-dominated galaxies from several previous studies are in excellent agreement with each other. In addition, we resolve some conflicting claims about the {beta}_*_ dependence of the j_*_-M_*_ scaling relations. The results presented here reinforce and extend our earlier suggestion that the distribution of galaxies with different {beta}_*_ in the j_*_-M_*_ diagram constitutes an objective, physically motivated alternative to subjective classification schemes such as the Hubble sequence.
- ID:
- ivo://CEFCA/jnep/J-NEP-PDR202107
- Title:
- J-NEP PDR202107 Catalogue (July, 2024)
- Short Name:
- J-NEP-PDR202107
- Date:
- 11 Sep 2024 13:00:00
- Publisher:
- Centro de Estudios de Física del Cosmos de Aragón (CEFCA)
- Description:
- J-NEP PDR202107 Catalogue (July, 2024) is based on scientific images in 60 filters. J-NEP is a 60-band photometric optical survey based on images collected by the JST250 telescope and the Pathfinder instrument at the Observatorio Astrofísico de Javalambre (OAJ, Teruel, Spain) . Please include the following in any published material that makes use of this data: "Based on observations made with the JST250 telescope and PathFinder camera for J-NEP project at the Observatorio Astrofísico de Javalambre, in Teruel, owned, managed and operated by the Centro de Estudios de Física del Cosmos de Aragón."
- ID:
- ivo://CDS.VizieR/J/MNRAS/377/430
- Title:
- Jodrell Bank Flat-spectrum radio sample
- Short Name:
- J/MNRAS/377/430
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the selection of the Jodrell Bank Flat-spectrum (JBF) radio source sample, which is designed to reduce the uncertainties in the Cosmic Lens All-Sky Survey (CLASS) gravitational lensing statistics arising from the lack of knowledge about the parent population luminosity function. From observations at 4.86GHz with the Very Large Array, we have selected a sample of 117 flat-spectrum radio sources with flux densities greater than 5mJy. These sources were selected in a similar manner to the CLASS complete sample and are therefore representative of the parent population at low flux densities. The vast majority (~90 per cent) of the JBF sample are found to be compact on the arcsec scales probed here and show little evidence of any extended radio jet emission. Using the JBF and CLASS complete samples, we find the differential number counts slope of the parent population above and below the CLASS 30-mJy flux density limit to be 2.07+/-0.02 and 1.96+/-0.12, respectively.
- ID:
- ivo://CDS.VizieR/J/A+A/568/A22
- Title:
- Joint analysis of the SDSS-II and SNLS SNe Ia
- Short Name:
- J/A+A/568/A22
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We deliver luminosity-distance measurements from a joint analysis of 740 type-Ia supernovae from the SDSS and SNLS supernova surveys.
- ID:
- ivo://CDS.VizieR/J/AJ/159/18
- Title:
- Jovian-type planets around M dwarfs with MIRI/JWST
- Short Name:
- J/AJ/159/18
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The upcoming launch of the James Webb Space Telescope (JWST) will dramatically increase our understanding of exoplanets, particularly through direct imaging. Microlensing and radial velocity surveys indicate that some M dwarfs host long-period giant planets. Some of these planets will likely be just a few parsecs away and a few astronomical units from their host stars, a parameter space that cannot be probed by existing high-contrast imagers. We studied whether the coronagraphs on the Mid-infrared Instrument on JWST can detect Jovian-type planets around nearby M dwarfs. For a sample of 27 very nearby M dwarfs, we simulated a sample of Saturn-Jupiter-mass planets with three atmospheric configurations and three orbital separations, observed in three different filters. We found that the f1550c 15.5 {mu}m filter is best suited for detecting Jupiter-like planets. Jupiter-like planets with patchy cloud cover, 2 au from their star, are detectable at 15.5 {mu}m around 14 stars in our sample, while Jupiters with clearer atmospheres are detectable around all stars in the sample. Saturns were most detectable at 10.65 and 11.4 {mu}m (f1065c and f1140c filters), but only with cloud-free atmospheres and within 3 pc (six stars). Surveying all 27 stars would take <170 hr of JWST integration time, or just a few hours for a shorter survey of the most favorable targets. There is one potentially detectable known planet in our sample: GJ 832 b. Observations aimed at detecting this planet should occur in 2024-2026, when the planet is maximally separated from the star.