- ID:
- ivo://CDS.VizieR/J/A+A/555/A11
- Title:
- DUNES survey observational results
- Short Name:
- J/A+A/555/A11
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Debris discs are a consequence of the planet formation process and constitute the fingerprints of planetesimal systems. Their solar system's counterparts are the asteroid and Edgeworth-Kuiper belts. The Herschel Open Time Key Programme DUNES (DUst around NEarby Stars) survey aims at detecting extra-solar analogues to the Edgeworth-Kuiper belt around solar-type stars, putting in this way the solar system into context. We used Herschel/PACS to observe a sample of nearby FGK stars. Data at 100 and 160 micron were obtained, complemented in some cases with observations at 70 micron, and at 250, 350 and 500 micron using SPIRE. The paper provides a detailed description of the observational results of the survey.
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Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/527/A109
- Title:
- Dust and PAH emission SEDs of disk galaxies
- Short Name:
- J/A+A/527/A109
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a self-consistent model of the spectral energy distributions (SEDs) of spiral galaxies from the ultraviolet (UV) to the mid-infrared (MIR)/far-infrared (FIR)/submillimeter (submm) based on a full radiative transfer calculation of the propagation of starlight in galaxy disks. This model predicts not only the total integrated energy absorbed in the UV/optical and re-emitted in the infrared/submm, but also the colours of the dust emission based on an explicit calculation of the strength and colour of the UV/optical radiation fields heating the dust, and incorporating a full calculation of the stochastic heating of small dust grains and PAH molecules. The geometry of the translucent components of the model is empirically constrained using the results from the radiation transfer analysis of Xilouris et al. on spirals in the middle range of the Hubble sequence, while the geometry of the optically thick components is constrained from physical considerations with a posteriori checks of the model predictions with observational data. These geometrical constraints enable the dust emission to be predicted in terms of a minimum set of free parameters: the central face-on dust opacity in the B-band {tau}^f^_B_, a clumpiness factor F for the star-forming regions, the star-formation rate SFR, the normalised luminosity of the old stellar population old and the bulge-to-disk ratio B/D. The results of the calculations are made available in the form of a large library of simulated dust emission SEDs spanning the whole parameter space of our model, together with the corresponding library of dust attenuation calculated using the same model.
- ID:
- ivo://CDS.VizieR/J/A+A/591/A130
- Title:
- Dynamic SEDs of southern blazars - DSSB
- Short Name:
- J/A+A/591/A130
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Simultaneous broadband spectral and temporal studies of blazars are an important tool for investigating active galactic nuclei (AGN) jet physics. We study the spectral evolution between quiescent and flaring periods of 22 radio-loud AGN through multiepoch, quasi-simultaneous broadband spectra. For many of these sources these are the first broadband studies. We use a Bayesian block analysis of Fermi/LAT light curves to determine time ranges of constant flux for constructing quasi-simultaneous spectral energy distributions (SEDs). The shapes of the resulting 81 SEDs are described by two logarithmic parabolas and a blackbody spectrum where needed.
- ID:
- ivo://CDS.VizieR/J/AN/333/209
- Title:
- Effective area of X-ray microcalorimeter
- Short Name:
- J/AN/333/209
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The historical development of ground based astronomical telescopes leads us to expect that space-based astronomical telescopes will need to be operational for many decades. The exchange of scientific instruments in space will be a prerequisite for the long lasting scientific success of such missions. Operationally, the possibility to repair or replace key spacecraft components in space will be mandatory. We argue that these requirements can be fulfilled with robotic missions and see the development of the required engineering as the main challenge. Ground based operations, scientifically and technically, will require a low operational budget of the running costs. These can be achieved through enhanced autonomy of the spacecraft and mission independent concepts for the support of the software. This concept can be applied to areas where the mirror capabilities do not constrain the lifetime of the mission.
- ID:
- ivo://CDS.VizieR/J/A+A/557/A66
- Title:
- Effective SEDs of IR galaxies at various z
- Short Name:
- J/A+A/557/A66
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Recent studies have revealed a strong correlation between the star formation rate (SFR) and stellarmass of the majority of star-forming galaxies, the so-called star-forming main sequence. An empirical modeling approach (the 2-SFM framework) that distinguishes between the main sequence and rarer starburst galaxies is capable of reproducing most statistical properties of infrared galaxies, such as number counts, luminosity functions, and redshift distributions. In this paper, we extend this approach by establishing a connection between stellar mass and halo mass with the technique of abundance matching. Based on a few simple assumptions and a physically motivated formalism, our model successfully predicts the (cross-)power spectra of the cosmic infrared background (CIB), the crosscorrelation between CIB and cosmic microwave background (CMB) lensing, and the correlation functions of bright, resolved infrared galaxies measured by Herschel, Planck, ACT, and SPT.We use this model to infer the redshift distribution of CIB-anisotropies and of the CIBxCMB lensing signal, as well as the level of correlation between CIB-anisotropies at different wavelengths. Material (effective spectral energy distributions, differential emissivities of halos, relations between Mh and SFR) associated to this model is available at http://irfu.cea.fr/Sap/Phocea/Page/index.php?id=537
- ID:
- ivo://CDS.VizieR/J/ApJS/167/177
- Title:
- Emission lines of evolving HII regions
- Short Name:
- J/ApJS/167/177
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We build, as far as theory will permit, self-consistent model HII regions around central clusters of aging stars. These produce strong emission line diagnostics applicable to either individual HII regions in galaxies or to the integrated emission line spectra of disk or starburst galaxies. The models assume that the expansion and internal pressure of individual HII regions is driven by the net input of mechanical energy from the central cluster, be it through winds or supernova events. This eliminates the ionization parameter as a free variable, replacing it with a parameter that depends on the ratio of the cluster mass to the pressure in the surrounding interstellar medium. These models explain why HII regions with low abundances have high excitation and demonstrate that at least part of the warm ionized medium is the result of overlapping faint, old, large, and low-pressure HII regions. We present line ratios (at both optical and IR wavelengths) that provide reliable abundance diagnostics for both single HII regions or for integrated galaxy spectra, and we find a number that can be used to estimate the mean age of the cluster stars exciting individual HII regions.
- ID:
- ivo://CDS.VizieR/J/AZh/73/762
- Title:
- Energy distribution in giants and supergiants.
- Short Name:
- J/AZh/73/762
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The energy distributions for 27 giants and supergiants of the M spectral type are presented in the region of 3200-7600{AA} with the step of 50{AA}. The observations were made in the Fessenkov Astrophysical institute (Alma-Ata) during 1986-1987 with a spectrophotometer of Seya-Namioka mounted on the 50-cm Cassegrain telescope. The primary standard is Vega with the energy distribution by Hayes (1985IAUS..111..225H). The relative r.m.s. of the results are given in the table3.dat.
- ID:
- ivo://CDS.VizieR/J/AZh/73/67
- Title:
- Energy distribution of G,K and M stars
- Short Name:
- J/AZh/73/67
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A large number of stars from photometrically homogeneous catalogs are used to derive the normal energy distribution for giants of 15 spectral subclasses. To judge the reliability of the results obtained, the mean (B-V)_S_ color indices calculated for a sample of stars with spectrophotometry are compared with the mean (B-V) for a complete sample of stars of a given subclass from the Bright Star (<V/50>) catalog.
- ID:
- ivo://CDS.VizieR/J/AZh/73/906
- Title:
- Energy distribution of main-sequence B stars
- Short Name:
- J/AZh/73/906
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The normal spectral energy distribution in the spectra of main-sequence B stars of five subclasses is presented. Spectral classification and UBV photometry from the fourth edition of the BSC and spectrophotometry from three extensive spectrophotometric catalogs are used. The method of selecting unreddened stars is outlined. The good agreement between the mean color indices in the UBV system calculated for a sample of stars with spectrophotometry and for considerably larger samples of unreddened stars of the corresponding subclasses from the BSC confirms the reliability of the results obtained.
- ID:
- ivo://CDS.VizieR/J/AZh/75/70
- Title:
- Energy distribution of O9-B5 stars
- Short Name:
- J/AZh/75/70
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The normal spectral energy distribution for spectral subtypes from O4 to O8 and O9 to B5 for luminosity classes V,IV and III are derived. Three photometrically uniform catalogs served as the source of the spectrophotometric data used. Synthetic color indices for all spectral types are calculated using the energy distribution curves obtained.
