- ID:
- ivo://CDS.VizieR/J/AJ/131/1288
- Title:
- Composite spectra of early-type galaxies
- Short Name:
- J/AJ/131/1288
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Chemical abundance indicators are studied using composite spectra, which we provide in tabular form. Tables of line strengths measured from these spectra and parameters derived from these line strengths are also provided. All the objects we analyze were selected from the SDSS database. We selected all objects targeted as galaxies and having Petrosian apparent magnitude 14.5<=r_Pet_<=17.75. To extract a sample of early-type galaxies, we then chose the subset with the spectroscopic parameter eclass<0, which classifies the spectral type based on a principal component analysis, and the photometric parameter fracDev_r_>0.8, which is a seeing-corrected indicator of morphology.
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Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/276/142
- Title:
- Compositional differences among the A-type stars
- Short Name:
- J/A+A/276/142
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- (no description available)
4263. ComPRASS catalogue
- ID:
- ivo://CDS.VizieR/J/A+A/626/A7
- Title:
- ComPRASS catalogue
- Short Name:
- J/A+A/626/A7
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the first all-sky catalogue of galaxy clusters and cluster candidates obtained from joint X-ray-SZ detections using observations from the Planck satellite and the ROSAT all-sky survey (RASS). The catalogue contains 2323 objects and has been validated by careful cross-identification with previously known clusters. This validation shows that 1597 candidates correspond to already known clusters, 212 coincide with other cluster candidates still to be confirmed, and the remaining 514 are completely new detections. With respect to Planck catalogues, the ComPRASS catalogue is simultaneously more pure and more complete. Based on the validation results in the SPT and SDSS footprints, the expected purity of the catalogue is at least 84.5%, meaning that more than 365 clusters are expected to be found among the new or still-to-be-confirmed candidates with future validation efforts or specific follow-ups.
- ID:
- ivo://CDS.VizieR/VII/262
- Title:
- Comprehensive Catalogue of Kiso UV-X Galaxies (KUG2000)
- Short Name:
- VII/262
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The referenced paper describes the compilation of the second Kiso UV-Excess galaxies survey as KUG2 catalogue. The result is shown in VII/261. The first survey catalogue KUG1 is shown in VII/179. As is described in the paper, there are some differences between KUG1 and KUG2, e.g. in photographic plates used and the observation condition in the surveys, such as emulsions, exposures or seeing sizes. The homogeneity of these KUG surveys is rather low, but their catalogues form a somewhat large collection of UV-excess/blue galaxies. In these circumstances, we intend to merge both catalogues, upon requests from investigators working in follow-up observations of these galaxies. In the process of catalogue merging, we met a systematic difference between the first (KUG1) and the second (KUG2) surveys in overall properties of objects, such as brightness, degree of UV-excess and morphological type. This mainly originates from differences in the observation condition and personal errors in the survey. We scrutinize and discuss those differences and errors, and finally merge into a comprehensive catalogue of KUGs (KUG2000) in the machine-readable form including near ten thousand UV-excess galaxies.
- ID:
- ivo://jvo/kug2000
- Title:
- Comprehensive Catalogue of Kiso UV-X Galaxies (KUG2000) (Nakajima+ 2010)
- Short Name:
- KUG2000
- Date:
- 14 Nov 2019 03:48:33
- Publisher:
- JVO
- Description:
- ================================================================================<BR> Comprehensive Catalogue of Kiso Ultraviolet-Excess Galaxies<BR> Miyauchi-Isobe N., Maehara H., and Nakajima K.<BR> Publ. Natl. Astron. Obs. Japan, 13, 9 (2010)=2010PNAOJ..13....9M<BR> * This catalogue is compiled by Nakajima K., Miyauchi-Isobe N., and Maehara H.<BR> following the description in the paper above.<BR> ================================================================================<BR> ADC_Keywords: Galaxies, UV-excess; Surveys<BR> Keywords: Ultraviolet-excess galaxies - Survey with Schmidt telescope - KUG<BR> <BR> Description:<BR> The above paper describes the compilation of the second Kiso UV-Excess galaxies survey as KUG2 catalogue. The result is shown in VII/994. The first survey catalogue KUG1 is shown in VII/179A. As is described in the paper, there are some differences between KUG1 and KUG2, e.g. in photographic plates used and the observation condition in the surveys, such as emulsions, exposures or seeing sizes. The homogeneity of these KUG surveys is rather low, but their catalogues form a somewhat large collection of UV-excess/blue galaxies. In these circumstances, we intend to merge both catalogues, upon requests from investigators working in follow-up observations of these galaxies. In the process of catalogue merging, we met a systematic difference between the first (KUG1) and the second (KUG2) surveys in overall properties of objects, such as brightness, degree of UV-excess and morphological type. This mainly originates from differences in the observation condition and personal errors in the survey. We scrutinize and discuss those differences and errors, and finally merge into a comprehensive catalogue of KUGs (KUG2000) in the machine-readable form including near ten thousand UV-excess galaxies.
- ID:
- ivo://CDS.VizieR/J/A+A/397/711
- Title:
- Comptonization and reflection in GRS 1915+105
- Short Name:
- J/A+A/397/711
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a comprehensive X-ray study of four years of pointed RXTE observations of GRS 1915+105 in the {chi}-state. We interpret the behavior of the hard power law tail spectrum as coming from inverse Compton scattering of soft disk photons on a thermally dominated hybrid corona above the accretion disk. GRS 1915+105 shows a strong, variable reflection amplitude. As in other BHC and in Seyfert galaxies, a correlation between the power law slope and the reflection was found. Also, the radio fluxes at 2.25GHz and 15GHz correlate with the power law slope, thus revealing a connection between the outflowing matter and the comptonizing region in the {chi}-states.
- ID:
- ivo://CDS.VizieR/J/ApJ/815/L13
- Title:
- Compton-thick AGNs from the 70-month Swift/BAT cat.
- Short Name:
- J/ApJ/815/L13
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Heavily obscured accretion is believed to represent an important stage in the growth of supermassive black holes and to play an important role in shaping the observed spectrum of the cosmic X-ray background. Hard X-ray (E>10keV) selected samples are less affected by absorption than samples selected at lower energies, and are therefore one of the best ways to detect and identify Compton-thick (CT, logN_H_>=24) active galactic nuclei (AGNs). In this letter we present the first results of the largest broadband (0.3-150keV) X-ray spectral study of hard X-ray selected AGNs to date, focusing on the properties of heavily obscured sources. Our sample includes the 834 AGNs (728 non-blazar, average redshift z~0.055) reported in the 70-month catalog of the all-sky hard X-ray Swift/Burst Alert Monitor survey. We find 55 CT AGNs, which represent 7.6_-2.1_^+1.1^% of our non-blazar sample. Of these, 26 are reported as candidate CT AGNs for the first time. We correct for selection bias and derive the intrinsic column density distribution of AGNs in the local universe in two different luminosity ranges. We find a significant decrease in the fraction of obscured Compton-thin AGNs for increasing luminosity, from 46+/-3% (for logL_14-195_=40-43.7) to 39+/-3% (for logL_14-195_=43.7-46). A similar trend is also found for CT AGNs. The intrinsic fraction of CT AGNs with logN_H_=24-25 normalized to unity in the logN_H_=20-25 range is 27+/-4%, and is consistent with the observed value obtained for AGNs located within 20Mpc.
- ID:
- ivo://CDS.VizieR/J/A+A/454/333
- Title:
- Computed Hbeta indices from ATLAS9 model
- Short Name:
- J/A+A/454/333
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Grids of H{beta} indices based on updated (new-ODF) ATLAS9 model atmospheres were computed for solar and scaled solar metallicities [+0.5], [+0.2], [0.0], [-0.5], [-1.0], [-1.5], [-2.0], [-2.5] and for alpha enhanced compositions [+0.5a], [0.0a], [-0.5a], [-1.0a], [-1.5a], [-2.0a], [-2.5a], and [-4.0a]. Indices for Teff>5000K were computed with the same methods as described by Lester, Gray & Kurucz (1986ApJS...61..509L) (LGK86) except for a different normalization of the computed natural system to the standard system. LGK86 used special ODFs to compute the fluxes. For Teff less or equal to 5000K we computed the fluxes using the synthetic spectrum method. In order to assess the accuracy of the computed indices comparisons were made with the indices computed by Smalley & Dworetsky (1995A&A...293..446S) (MD95) and with the empirical relations Teff-H{beta} given by Alonso et al. (1996A&A...313..873A) for several metallicities. Furthermore, for cool stars, temperatures inferred from the computed indices were compared with those of the fundamental stars listed by MD95. The same kind of comparison was made between gravities for B-type stars. The temperatures from the computed indices are in good agreement, within the error limits, with the literature values for Teff between 4750K and 8000K, while the gravities agree for Teff>9000K. The computed H{beta} indices for the Sun and for Procyon are very close to the observed values. The comparison between the observed and computed H{beta} indices as function of the observed H{beta} has shown a very small trend which almost completely disappears when only stars hotter than 10000K are considered. The trend due to the cool stars is probably related with the low accuracy of the fundamental Teff which are affected by large errors for most of the stars.
- ID:
- ivo://edu.gavo.org/hd/splat_redshift
- Title:
- Compute Redshifts of Quasars Using SPLAT-VO
- Date:
- 03 Apr 2025 09:45:51
- Publisher:
- The GAVO DC team
- Description:
- This tutorial uses SPLAT-VO to search the VO registry for spectra of galaxies and quasars. From the obtained spectra, the Hydrogen Lyman Alpha line will be used to compute redshift and velocity
4270. 31 Com radial velocities
- ID:
- ivo://CDS.VizieR/J/A+A/520/A52
- Title:
- 31 Com radial velocities
- Short Name:
- J/A+A/520/A52
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The single rapidly-rotating G0 giant 31 Comae has been a puzzle because of the absence of photometric variability despite its strong chromospheric and coronal emissions. As a Hertzsprung-gap giant, it is expected to be at the stage of rearranging its moment of inertia, hence likely also its dynamo action, which could possibly be linked with its missing photospheric activity. Our aim is to detect photospheric activity, obtain the rotation period, and use it for a first Doppler image of the star's surface. Its morphology could be related to the evolutionary status.
