- ID:
- ivo://CDS.VizieR/J/A+A/610/A77
- Title:
- Orion Integral Filament ALMA+IRAM30m N2H+(1-0) data
- Short Name:
- J/A+A/610/A77
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have investigated the gas organization within the paradigmatic Integral Shape Filament (ISF) in Orion in order to decipher whether or not all filaments are bundles of fibers. We combined two new ALMA Cycle 3 mosaics with previous IRAM 30m observations to produce a high-dynamic range N2H+ (1-0) emission map of the ISF tracing its high-density material and velocity structure down to scales of 0.009pc (or ~2000AU). From the analysis of the gas kinematics, we identify a total of 55 dense fibers in the central region of the ISF. Independently of their location in the cloud, these fibers are characterized by transonic internal motions, lengths of ~0.15pc, and masses per unit length close to those expected in hydrostatic equilibrium. The ISF fibers are spatially organized forming a dense bundle with multiple hub-like associations likely shaped by the local gravitational potential. Within this complex network, the ISF fibers show a compact radial emission profile with a median FWHM of 0.035pc systematically narrower than the previously proposed universal 0.1pc filament width. Our ALMA observations reveal complex bundles of fibers in the ISF, suggesting strong similarities between the internal substructure of this massive filament and previously studied lower-mass objects. The fibers show identical dynamic properties in both low- and high-mass regions, and their widespread detection in nearby clouds suggests a preferred organizational mechanism of gas in which the physical fiber dimensions (width and length) are self-regulated depending on their intrinsic gas density. Combining these results with previous works in Musca, Taurus, and Perseus, we identify a systematic increase of the surface density of fibers as a function of the total mass per-unit-length in filamentary clouds. Based on this empirical correlation, we propose a unified star-formation scenario where the observed differences between low- and high-mass clouds, and the origin of clusters, emerge naturally from the initial concentration of fibers.
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Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/486/755
- Title:
- Parameters of galaxies in 8 Abell clusters
- Short Name:
- J/A+A/486/755
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This paper is a continuation of an ongoing study of the evolutionary processes affecting cluster galaxies. Both CCD R band and Halpha narrow-band imaging was used to determine photometric parameters (m_r_, r_24_, Halpha flux, and equivalent width) and derive star formation rates for 227 CGCG galaxies in 8 low-redshift clusters. The galaxy sample is a subset of CGCG galaxies in an objective prism survey (OPS) of cluster galaxies for Halpha emission. It is found that detection of emission-line galaxies in the OPS is 85%, 70%, and 50% complete at the mean surface brightness values of 1.25x10^-19^, 5.19x10^-20^, and 1.76x10^-20^W/m^2^/arcsec^2^, respectively, measured within the R band isophote of 24mag/arcsec^2^ for the galaxy. The CCD data, together with matched data from a recent Halpha galaxy survey of UGC galaxies within 3000km/s, will be used for a comparative study of R band and Halpha surface photometry between cluster and field spirals.
- ID:
- ivo://CDS.VizieR/J/MNRAS/459/4450
- Title:
- Peculiar compact stellar systems in Fornax
- Short Name:
- J/MNRAS/459/4450
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We search for hints to the origin and nature of compact stellar systems in the magnitude range of ultracompact dwarf galaxies in deep wide-field imaging data of the Fornax cluster core. We visually investigate a large sample of 355 spectroscopically confirmed cluster members with V-band equivalent magnitudes brighter than -10mag for faint extended structures. Our data reveal peculiar compact stellar systems, which appear asymmetric or elongated from their outer light distribution. We characterize the structure of our objects by quantifying their core concentration, as well as their outer asymmetry and ellipticity. For the brighter objects of our sample we also investigate their spatial and phase-space distribution within the cluster. We argue that the distorted outer structure alone that is seen for some of our objects, is not sufficient to decide whether these systems have a star cluster or a galaxy origin. However, we find that objects with low core concentration and high asymmetry (or high ellipticity) are primarily located at larger cluster-centric distances as compared to the entire sample. This supports the hypothesis that at least some of these objects may originate from tidally stripped galaxies.
- ID:
- ivo://CDS.VizieR/J/MNRAS/239/459
- Title:
- Photographic study of A2197 and A2199
- Short Name:
- J/MNRAS/239/459
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Radii, b26 magnitudes, (b-r) colors, position angles, and ellipticities have been measured on the plates of Palomar 48-inch Schmidt telescope taken in May 1976, for 6925 galaxies in a 5-sq deg field enclosing the close pair of rich clusters A2197 and A2199.
- ID:
- ivo://CDS.VizieR/J/MNRAS/474/339
- Title:
- Photometric analysis of Abell 1689
- Short Name:
- J/MNRAS/474/339
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a photometric analysis of 65 galaxies in the rich cluster Abell 1689 at z=0.183, using the Hubble Space Telescope Advanced Camera for Surveys archive images in the rest-frame V band. We perform two-dimensional multicomponent photometric decomposition of each galaxy adopting different models of the surface-brightness distribution. We present an accurate morphological classification for each of the sample galaxies. For 50 early-type galaxies, we fit both a de Vaucouleurs law and a Sersic law; S0s are modelled by also including a disc component described by an exponential law. Bars of SB0s are described by the profile of a Ferrers ellipsoid. For the 15 spirals, we model a Sersic bulge, exponential disc and, when required, a Ferrers bar component. We derive the Fundamental Plane (FP) by fitting 40 early-type galaxies in the sample, using different surface-brightness distributions. We find that the tightest plane is that derived by Sersic bulges. We find that bulges of spirals lie on the same relation. The FP is better defined by the bulges alone rather than the entire galaxies. Comparison with local samples shows both an offset and rotation in the FP of Abell 1689.
- ID:
- ivo://CDS.VizieR/J/MNRAS/477/845
- Title:
- Photometric catalogue of CALIFA galaxies
- Short Name:
- J/MNRAS/477/845
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present an extensive compendium of photometrically determined structural properties for all Calar Alto Legacy Integral Field spectroscopy Area (CALIFA)galaxies in the third data release (DR3). We exploit Sloan Digital Sky Survey (SDSS) images in order to extract one-dimensional (1D) gri surface brightness profiles for all CALIFA DR3 galaxies. We also derive a variety of non-parametric quantities and parametric models fitted to 1D i-band profiles. The galaxy images are decomposed using the 2D bulge-disc decomposition programs IMFIT and GALFIT. The relative performance and merit of our 1D and 2D modelling approaches are assessed. Where possible, we compare and augment our photometry with existing measurements from the literature. Close agreement is generally found with the studies of Walcher et al. (2014A&A...569A...1W) and Mendez-Abreu et al. (2017A&A...598A..32M, Cat. J/A+A/598/A32), though some significant differences exist. Various structural metrics are also highlighted on account of their tight dispersion against an independent variable, such as the circular velocity.
- ID:
- ivo://CDS.VizieR/J/A+AS/122/409
- Title:
- Photometric catalogue of Coma
- Short Name:
- J/A+AS/122/409
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a CCD catalogue of 7023 galaxies and 4096 stars in the region of the Coma cluster containing positions, central surface brightnesses and V magnitudes (isophote 26.5). We estimate that data is complete up to isophotal V magnitude 22.5 and the surface brightness limiting detection value is approximately 24 mag/arcsec2.
- ID:
- ivo://CDS.VizieR/J/ApJS/158/161
- Title:
- Photometric redshift catalog from the RCS
- Short Name:
- J/ApJS/158/161
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Red-Sequence Cluster Survey (RCS, Cat. <J/ApJS/157/1>) provides a large and deep photometric catalog of galaxies in the z' and R_c_ bands for 90{deg}^2^ of sky, and supplemental V and B data have been obtained for 33.6{deg}^2^. We compile a photometric redshift catalog from these four-band data by utilizing the empirical quadratic polynomial photometric redshift fitting technique in combination with CNOC2 and GOODS/HDF-N redshift data. The training set includes 4924 spectral redshifts. The resulting catalog contains more than one million galaxies with photometric redshifts <1.5 and R_c_<24, giving an rms scatter {sigma}({Delta}z)<0.06 within the redshift range 0.2<z<0.5 and {sigma}({Delta}z)<0.11 for galaxies at 0.0<z<1.5.
- ID:
- ivo://CDS.VizieR/J/AJ/135/1917
- Title:
- Photometric search for transients in galaxy clusters
- Short Name:
- J/AJ/135/1917
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have begun a program to search for supernovae and other transients in the fields of galaxy clusters with the 2.3m Bok Telescope on Kitt Peak. We present our automated photometric methods for data reduction, efficiency characterization, and initial spectroscopy. With this program, we aim to ultimately identify ~25-35 cluster Type Ia supernovae (SNe Ia) (~10 of which will be intracluster, hostless events) and constrain the SN Ia rate associated with old, passive stellar populations. With these measurements we will constrain the relative contribution of hostless and hosted SNe Ia to the metal enrichment of the intracluster medium.
- ID:
- ivo://CDS.VizieR/J/AJ/131/1891
- Title:
- Photometric survey of MS 1054-03 field
- Short Name:
- J/AJ/131/1891
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present deep near-infrared Js-, H-, and Ks-band imaging of a field around MS 1054-03, a massive cluster at z=0.83. The observations were carried out with the ISAAC instrument at the ESO Very Large Telescope (VLT) as part of the Faint Infrared Extragalactic Survey (FIRES). The total integration time amounts to 25.9hr in Js, 24.4hr in H, and 26.5hr in Ks, divided nearly equally between four pointings covering 5.5'x5.3'. The 3 total limiting AB magnitudes for point sources from the shallowest to the deepest pointing are J^tot^_s,AB_=26.0-26.2, H^tot^_AB_=25.5-25.8, and K^tot^_s,AB_=25.3-25.7mag. The effective spatial resolution of the co-added images has FWHM=0.48", 0.46", and 0.52" in Js, H, and Ks, respectively. We complemented the ISAAC data with deep optical imaging using existing Hubble Space Telescope WFPC2 mosaics through the F606W and F814W filters and additional U-, B-, and V-band observations we obtained with the VLT FORS1 instrument. We constructed a Ks-band-limited multicolor source catalog down to K^tot^_s,AB_~25mag (~5{sigma} for point sources). The catalog contains 1858 objects, of which 1663 have eight-band photometry. We describe the observations, data reduction, source detection, and photometric measurements method. We also present the number counts, color distributions, and photometric redshifts zph of the catalog sources. We find that our Ks-band counts at the faint end 22<~K_s,AB_<~25, with slope dlogN/dm=0.20, lie at the flatter end of published counts in other deep fields and are consistent with those we derived previously in the Hubble Deep Field-South (HDF-S), the other FIRES field. Spectroscopic redshifts zsp are available for ~330 sources in the MS 1054-03 field; comparison between zph and zsp shows very good agreement, with <|zsp-zph|/(1+zsp)>=0.078. The MS 1054-03 field observations complement our HDF-S data set with a nearly 5 times larger area at ~0.7mag brighter limits, providing more robust statistics for the slightly brighter source populations.
