- ID:
- ivo://CDS.VizieR/J/ApJ/668/853
- Title:
- Spectroscopy of UltraStrong Emission Line galaxies
- Short Name:
- J/ApJ/668/853
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We describe the results of a narrowband search for ultrastrong emission line galaxies (USELs) with EW(H{beta})>=30{AA}. A total of 542 candidate galaxies are found in a one-half square degree survey using two ~120{AA} filters centered at 8150 and 9140{AA} with Subaru SuprimeCam. Follow-up spectroscopy for randomly selected objects in the candidate sample with Keck II DEIMOS shows that they consist of [OIII] {lambda}5007-, [OII] {lambda}3727-, and H{alpha}-selected strong emission line galaxies at intermediate redshift (z<1) and Ly{alpha}-emitting galaxies at high redshift (z>>5).
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/ApJ/693/1713
- Title:
- Spectroscopy of X-ray sources in ECDF-S
- Short Name:
- J/ApJ/693/1713
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the first results of our optical spectroscopy program aimed to provide redshifts and identifications for the X-ray sources in the Extended Chandra Deep Field South. A total of 339 sources were targeted using the IMACS spectrograph at the Magellan telescopes and the VIMOS spectrograph at the VLT. We measured redshifts for 186 X-ray sources, including archival data and a literature search. We find that the active galactic nucleus (AGN) host galaxies have on average redder rest-frame optical colors than nonactive galaxies, and that they live mostly in the "green valley". The dependence of the fraction of AGNs that are obscured on both luminosity and redshift is confirmed at high significance and the observed AGN spatial density is compared with the expectations from existing luminosity functions. These AGNs show a significant difference in the mid-IR to X-ray flux ratio for obscured and unobscured AGNs, which can be explained by the effects of dust self-absorption on the former. This difference is larger for lower luminosity sources, which is consistent with the dust opening angle depending on AGN luminosity.
- ID:
- ivo://CDS.VizieR/J/ApJ/880/46
- Title:
- Spectroscopy & V-band monitoring of CTS C30.10
- Short Name:
- J/ApJ/880/46
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report 6yr monitoring of distant bright quasar CTS C30.10 (z=0.90052) with the Southern African Large Telescope. We measured the rest-frame time lag of 562_-68_^+116^ days between the continuum variations and the response of the MgII emission line, using six different methods. This time delay, combined with other available measurements of MgII line delay, mostly for lower-redshift sources, shows that the MgII line reverberation implies a radius-luminosity relation very similar to the one based on a more frequently studied H{beta} line.
3494. Spectrum of SXP1062
- ID:
- ivo://CDS.VizieR/J/A+A/556/A139
- Title:
- Spectrum of SXP1062
- Short Name:
- J/A+A/556/A139
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Be/X-ray binary SXP 1062 is of especial interest owing to the large spin period of the neutron star, its large spin-down rate, and the association with a supernova remnant constraining its age. This makes the source an important probe for accretion physics. To investigate the long-term evolution of the spin period and associated spectral variations, we performed an XMM-Newton target-of-opportunity observation of SXP 1062 during X-ray outburst. Spectral and timing analysis of the XMM-Newton data was compared with previous studies, as well as complementary Swift/XRT monitoring and optical spectroscopy with the SALT telescope were obtained. The spin period was measured to be Ps=(1071.01+/-0.16)s on 2012 Oct 14. The X-ray spectrum is similar to that of previous observations. No convincing cyclotron absorption features, which could be indicative for a high magnetic field strength, are found. The high-resolution RGS spectra indicate the presence of emission lines, which may not completely be accounted for by the SNR emission. The comparison of multi-epoch optical spectra suggest an increasing size or density of the decretion disc around the Be star. SXP 1062 showed a net spin-down with an average of dPs/dt=(2.27+/-0.44)s/yr over a baseline of 915 days.
- ID:
- ivo://CDS.VizieR/J/A+A/639/A47
- Title:
- SPHERE and NaCo images of HD 19467B
- Short Name:
- J/A+A/639/A47
- Date:
- 23 Mar 2022 16:31:06
- Publisher:
- CDS
- Description:
- HD 19467 observations were performed with the VLT exoplanet imager SPHERE and the VLT adaptive optics camera NaCo to further characterize the spectral and orbital properties of the known T-type brown dwarf companion.
- ID:
- ivo://CDS.VizieR/J/MNRAS/478/4952
- Title:
- SPIDERS BCGs gri photometry
- Short Name:
- J/MNRAS/478/4952
- Date:
- 10 Dec 2021 13:51:48
- Publisher:
- CDS
- Description:
- We present a sample of 329 low-to intermediate-redshift (0.05<z<0.3) brightest cluster galaxies (BCGs) in X-ray-selected clusters from the SPectroscopic IDentification of eRosita Sources survey, a spectroscopic survey within Sloan Digital Sky Survey-IV (SDSS-IV). We define our BCGs by simultaneous consideration of legacy X-ray data from ROSAT, maximum-likelihood outputs from an optical cluster-finder algorithm and visual inspection. Using SDSS imaging data, we fit Sersic profiles to our BCGs in three bands (g, r, i) with SIGMA a GALFIT-based software wrapper. We examine the reliability of our fits by running our pipeline on ~10^4^ point spread function-convolved model profiles injected into eight random cluster fields; we then use the results of this analysis to create a robust subsample of 198 BCGs. We outline three cluster properties of interest: overall cluster X-ray luminosity (L_X_), cluster richness as estimated by REDMAPPER ({lambda}),and cluster halo mass (M_200_), which is estimated via velocity dispersion. In general, there are significant correlations with BCG stellar mass between all three environmental properties, but no significant trends arise with either Sersic index or effective radius. There is no major environmental dependence on the strength of the relation between effective radius and BCG stellar mass. Stellar mass therefore arises as the most important factor governing BCG morphology. Our results indicate that our sample consists of a large number of relaxed, mature clusters containing broadly homogeneous BCGs up to z~0.3, suggesting that there is little evidence for much ongoing structural evolution for BCGs in these systems.
- ID:
- ivo://CDS.VizieR/J/ApJ/907/123
- Title:
- Spin Parity of Spiral Galaxies. III.
- Short Name:
- J/ApJ/907/123
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This is a revised catalog of spiral winding direction of SDSS spiral galaxies published by Shamir (2017PASA...34...11S). Whether the spiral pattern as projected on the sky is S-wise or Z-wise (Shamir called them counter clock wise and clockwise, respectively) can be an unambiguous tool to identify whether the galaxy spin vector is pointing toward or away from us as all the spirals are safely regarded as trailing spirals (Iye et al., 2019ApJ...886..113S). We used Shamir's catalog to analyze the dipole anisotropy in their large-scale structure and found that there exist rather massive duplicated entries and a few other minor errors in the original catalog. In this revised version those duplicated entries are cleaned keeping the judgment of the spiral winding direction due to Shamir (2017PASA...34...11S) except for a several obviously inconsistent cases. These corrections were necessary to make analysis of the large scale distribution of spin vectors of galaxies of the SDSS sample in our paper.
- ID:
- ivo://CDS.VizieR/J/AJ/116/1626
- Title:
- Spiral and lenticular galaxy brightness profiles
- Short Name:
- J/AJ/116/1626
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present one of the largest homogeneous sets of spiral and lenticular galaxy brightness profile decompositions completed to date. The 659 galaxies in our sample have been fitted with a de Vaucouleurs law for the bulge component and an inner-truncated exponential for the disk component. Of the 659 galaxies in the sample, 620 were successfully fitted with the chosen fitting functions. The fits are generally well defined, with more than 90% having rms deviations from the observed profile of less than 0.35mag. We find no correlations of fitting quality, as measured by these rms residuals, with either morphological type or inclination. Similarly, the estimated errors of the fitted coefficients show no significant trends with type or inclination. These decompositions form a useful basis for the study of the light distributions of spiral and lenticular galaxies. The object base is sufficiently large that well-defined samples of galaxies can be selected from it.
3499. Spiral arms Gaia EDR3
- ID:
- ivo://CDS.VizieR/J/A+A/651/A104
- Title:
- Spiral arms Gaia EDR3
- Short Name:
- J/A+A/651/A104
- Date:
- 22 Feb 2022
- Publisher:
- CDS
- Description:
- Using the astrometry and integrated photometry from the Gaia Early Data Release 3 (EDR3), we map the density variations in the distribution of young Upper Main Sequence (UMS) stars, open clusters and classical Cepheids in the Galactic disk within several kiloparsecs of the Sun. Maps of relative over/under-dense regions for UMS stars in the Galactic disk are derived, using both bivariate kernel density estimators and wavelet transformations. The resulting overdensity maps exhibit large-scale arches, that extend in a clumpy but coherent way over the entire sampled volume, indicating the location of the spiral arms segments in the vicinity of the Sun. Peaks in the UMS overdensity are well-matched by the distribution of young and intrinsically bright open clusters. By applying a wavelet transformation to a sample of classical Cepheids, we find that their overdensities possibly extend the spiral arm segments on a larger scale (~10kpc from the Sun). While the resulting map based on the UMS sample is generally consistent with previous models of the Sagittarius-Carina spiral arm, the geometry of the arms in the III quadrant (galactic longitudes 180{deg}<l<270{deg}) differs significantly from many previous models. In particular we find that our maps favour a larger pitch angle for the Perseus arm, and that the Local Arm extends into the III quadrant at least 4kpc past the Sun's position, giving it a total length of at least 8kpc.
3500. Spirals in Virgo. III.
- ID:
- ivo://CDS.VizieR/J/A+AS/110/279
- Title:
- Spirals in Virgo. III.
- Short Name:
- J/A+AS/110/279
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the analysis of the rotation curves of a sample of 32 spiral galaxies derived from the spectroscopic observations of a sample of 47 galaxies.
