- ID:
- ivo://CDS.VizieR/J/ApJ/776/74
- Title:
- GASS VII. Bivariate HI-stellar mass function
- Short Name:
- J/ApJ/776/74
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the bivariate neutral atomic hydrogen (HI)-stellar mass function (HISMF) {phi}(M_HI_, M_{star}_) for massive (logM_*_/M_{sun}_>10) galaxies derived from a sample of 480 local (0.025<z<0.050) galaxies observed in H I at Arecibo as part of the GALEX Arecibo SDSS Survey. We fit six different models to the HISMF and find that a Schechter function that extends down to a 1% HI gas fraction, with an additional fractional contribution below that limit, is the best parameterization of the HISMF. We calculate {Omega}_HI,M_{star}__>10^10^ and find that massive galaxies contribute 41% of the H I density in the local universe. In addition to the binned HISMF, we derive a continuous bivariate fit, which reveals that the Schechter parameters only vary weakly with stellar mass: M_HI_^*^, the characteristic H I mass, scales as M_{star}_^0.39^; {alpha}, the slope of the HISMF at moderate H I masses, scales as M_{star}_^0.07^; and f, the fraction of galaxies with HI gas fraction greater than 1%, scales as M_{star}_^-0.24^. The variation of f with stellar mass should be a strong constraint for numerical simulations. To understand the physical mechanisms that produce the shape of the HISMF, we redefine the parameters of the Schechter function as explicit functions of stellar mass and star formation rate (SFR) to produce a trivariate fit. This analysis reveals strong trends with SFR. While M_HI_^*^ varies weakly with stellar mass and SFR (M_HI_^*^{prop.to}M_{star}_^0.22^, M_HI_^*^{prop.to}SFR^-0.03^), {alpha} is a stronger function of both stellar mass and especially SFR ({alpha}{prop.to}M_{star}_^0.47^, {alpha}{prop.to}SFR^0.95^). The HISMF is a crucial tool that can be used to constrain cosmological galaxy simulations, test observational predictions of the H I content of populations of galaxies, and identify galaxies whose properties deviate from average trends.
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- ID:
- ivo://CDS.VizieR/J/A+A/440/107
- Title:
- Gas velocity curve along five spiral galaxies
- Short Name:
- J/A+A/440/107
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the minor-axis kinematics of ionized gas and stars for a sample of 5 spiral galaxies, which are characterized by either a zero or a shallow gas velocity gradient along their major axis. The asymmetric velocity profiles observed along the minor axis of NGC 4064 and NGC 4189 can be explained as due to the presence of a bar. This is also the case of NGC 4178 where the innermost portion of the gaseous disk is nearly face on. In NGC 4424 and NGC 4941, we measured non-zero gas velocities only in the central regions along the minor axis and gas velocities drop to zero at larger radii. This kinematic feature is suggestive of the presence of an orthogonally-rotating gaseous component which is confined in the innermost regions (i.e. an inner polar disk) to be confirmed with integral-field spectroscopy.
- ID:
- ivo://CDS.VizieR/J/ApJ/897/89
- Title:
- 1482 Gaussian clumps in the Central Molecular Zone
- Short Name:
- J/ApJ/897/89
- Date:
- 11 Mar 2022
- Publisher:
- CDS
- Description:
- We carry out a systematic study of the density structure of gas in the Central Molecular Zone (CMZ) in the Galactic center by extracting clumps from the APEX Telescope Large Area Survey of the Galaxy survey at 870{mu}m. We find that the clumps follow a scaling of m={rho}_0_r^3^, which corresponds to a characteristic density of n_H_2__=1.6x10^3^/cm^3^ ({rho}_0_=112M{sun}/pc^3^) with a variation of ~0.5dex, where we assumed a gas-to-dust mass ratio of 100. This characteristic density can be interpreted as the result of thermal pressure equilibrium between the molecular gas and the warm ambient interstellar medium. Such an equilibrium can plausibly be established since shear has approximately the same strength as self-gravity. Our findings may explain the fact that star formation in the CMZ is highly inefficient compared to the rest of the Milky Way disk. We also identify a population of clumps whose densities are two orders of magnitudes higher in the vicinity of the Sgr B2 region, which we propose are produced by collisions between the clumps of lower densities. For these collisions to occur, processes such as compressive tides probably have created the appropriate condition by assembling the clumps together.
- ID:
- ivo://CDS.VizieR/J/A+A/633/A14
- Title:
- GaussPy+ decomposition of Galactic Ring Survey
- Short Name:
- J/A+A/633/A14
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The analysis of large molecular line surveys of the Galactic plane is essential for our understanding of the gas kinematics on Galactic scales and, in particular, its link with the formation and evolution of dense structures in the interstellar medium. An approximation of the emission peaks with Gaussian functions allows for an efficient and straightforward extraction of useful physical information contained in the shape and Doppler-shifted frequency of the emission lines contained in these enormous data sets. In this work, we present an overview and the first results of a Gaussian decomposition of the entire Galactic Ring Survey (GRS) ^13^CO (1-0) data that consists of about 2.3 million spectra. We performed the decomposition with the fully automated GaussPy+ algorithm and fitted about 4.6 million Gaussian components to the GRS spectra. These decomposition results enable novel and unexplored ways to interpret and study the gas velocity structure. We discuss the statistics of the fit components and relations between the fitted intensities, velocity centroids, and velocity dispersions. We find that the magnitude of the velocity dispersion values increase towards the inner Galaxy and around the Galactic midplane, which we speculate is partly due to the influence of the Galactic bar and regions with higher non-thermal motions located in the midplane, respectively. We also used our decomposition results to infer global properties of the gas emission and find that the number of fit components used per spectrum is indicative of the amount of structure along the line of sight. We find that the emission lines from regions located on the far side of the Galaxy show increased velocity dispersion values, which are likely due to beam averaging effects. We demonstrate how this trend has the potential to aid in characterising Galactic structure by disentangling emission that belongs to the nearby Aquila Rift molecular cloud from emission that is more likely associated with the Perseus and Outer spiral arms. With this work, we also make our entire decomposition results available.
- ID:
- ivo://org.gavo.dc/obsform/q/web
- Title:
- GAVO Data Center Obscore Form
- Short Name:
- obscore web
- Date:
- 15 Aug 2024 15:17:13
- Publisher:
- The GAVO DC team
- Description:
- This is a form-based service allowing users to run simple queries against GAVO Data Center's ivoa.obscore table, with some nods to users looking of data near the optical waveband. For serious use, the `obscore table`_ should be queried through TAP. Note that queries without spatial constraints may take time out. You probably ought to switch to async TAP if you really want to run such queries. .. _obscore table: /tableinfo/ivoa.obscore?tapinfo=true
- ID:
- ivo://org.gavo.dc/__system__/obscore/ObsCore
- Title:
- GAVO Data Center Obscore Table
- Short Name:
- GAVO DC Obscore
- Date:
- 15 Aug 2024 15:17:01
- Publisher:
- The GAVO DC team
- Description:
- The IVOA-defined obscore table, containing generic metadata for datasets within this datacenter.
- ID:
- ivo://org.gavo.dc/__system__/obs-radio/obs_radio
- Title:
- GAVO Data Center obs_radio Table
- Short Name:
- ivoa.obs_radio
- Date:
- 15 Aug 2024 15:17:12
- Publisher:
- The GAVO DC team
- Description:
- An IVOA-defined metadata table for radio measurements, with extra metadata for interferometric measurements ("visibilities") as well as single-dish observations. You will almost always want to join this table to ivoa.obscore (do a natural join).
- ID:
- ivo://org.gavo.dc/__system__/siap2/sitewide
- Title:
- GAVO Data Center SIAP Version 2 Service
- Short Name:
- GAVO DC SIA2
- Date:
- 15 Aug 2024 15:17:01
- Publisher:
- The GAVO DC team
- Description:
- The GAVO Data Center's sitewide SIAP version 2 service publishes all the images published through the site. For more advanced queries including uploads, all this data is also available through ObsTAP.
- ID:
- ivo://org.gavo.dc/tap
- Title:
- GAVO Data Center TAP service
- Short Name:
- GAVO DC TAP
- Date:
- 23 Feb 2022 00:23:41
- Publisher:
- The GAVO DC team
- Description:
- The GAVO Data Center's TAP end point. The Table Access Protocol (TAP) lets you execute queries against our database tables, inspect various metadata, and upload your own data. In GAVO's data center, we in particular hold several large catalogs like PPMXL, 2MASS PSC, USNO-B2, UCAC4, WISE, SDSS DR7, for you to use in crossmatches, possibly with uploaded tables. Tables exposed through this endpoint include: nucand from the amanda schema, main from the annisred schema, data from the antares schema, data from the antares10 schema, dr10 from the apass schema, frames from the apo schema, main from the applause schema, gfh, id, identified, master, nid, unidentified from the arigfh schema, main from the arihip schema, main from the auger schema, data, phot_all, ssa_time_series from the bgds schema, data from the boydende schema, cat from the browndwarfs schema, cubes, fluxposv1200, fluxposv500, fluxv1200, fluxv500, objects, spectra from the califadr3 schema, images, srccat from the cars schema, meta from the carsarcs schema, main from the cs82morphoz schema, geo from the cstl schema, data from the danish schema, main from the dfbsplates schema, spectra, ssa from the dfbsspec schema, main from the dmubin schema, main from the emi schema, data from the feros schema, fk6join, part1, part3 from the fk6 schema, data from the flare_survey schema, data, ordersmeta from the flashheros schema, data from the fornax schema, dr2_ts_ssa, dr2epochflux, dr2light, edr3lite from the gaia schema, hyacob, maglims5, maglims6, maglims7, main, missing_10mas, rejected, resolvedss from the gcns schema, data from the gcpms schema, main from the gdr2ap schema, main from the gdr2dist schema, main, photometry from the gdr2mock schema, main from the gedr3auto schema, litewithdist, main from the gedr3dist schema, generated_data, maglim_5, maglim_6, maglim_7, main, parsec_props from the gedr3mock schema, main from the gedr3spur schema, columns, services, tables from the glots schema, main from the gps1 schema, main from the hdgaia schema, data from the hiicounter schema, main from the hipparcos schema, main from the hppunion schema, main from the hsoy schema, nucand from the icecube schema, data from the inflight schema, obscore from the ivoa schema, events, photpoints, timeseries from the k2c9vst schema, plates from the kapteyn schema, katkat from the katkat schema, data from the lamost5 schema, ssa_lrs, ssa_mrs from the lamost6 schema, geocounts, measurements, stations from the lightmeter schema, rawframes from the liverpool schema, main from the lspm schema, plates, wolfpalisa from the lsw schema, main from the magic schema, reduced from the maidanak schema, exts from the mcextinct schema, cubes, slitspectra from the mlqso schema, epn_core, mpcorb from the mpc schema, main, stars from the mwsc schema, main, stars from the mwsce14a schema, data from the obscode schema, bibrefs, maps, masers, monitor from the ohmaser schema, measurements, ssa from the onebigb schema, data, shapes from the openngc schema, main from the pcc schema, data from the plc schema, data from the plc2 schema, data from the plc3 schema, data from the plts schema, data from the polcatsmc schema, plates, rawplates from the potsdam schema, cubes, maps from the ppakm31 schema, data from the ppmx schema, main, usnocorr from the ppmxl schema, map10, map6, map7, map8, map9, map_union from the prdust schema, dr2, dr3, dr4, main from the rave schema, images, photons from the rosat schema, alt_identifier, authorities, capability, g_num_stat, interface, intf_param, registries, relationship, res_date, res_detail, res_role, res_schema, res_subject, res_table, resource, stc_spatial, stc_spectral, stc_temporal, subject_uat, table_column, tap_tables, validation from the rr schema, objects, photpar from the sasmirala schema, sources from the sdssdr7 schema, main from the smakced schema, main from the spm4 schema, sources from the supercosmos schema, columns, groups, key_columns, keys, schemas, tables from the tap_schema schema, main from the taptest schema, main from the tenpc schema, main from the tgas schema, data from the theossa schema, epn_core from the titan schema, data, line_tap from the toss schema, data from the twomass schema, icrscorr, main, ppmxlcross from the ucac3 schema, main from the ucac4 schema, main from the ucac5 schema, main from the urat1 schema, data, platecorrs, plates, ppmxcross, spurious, twomasscross from the usnob schema, data from the veronqsos schema, stripe82 from the vlastripe82 schema, main from the wdsdss10 schema, archives, main from the wfpdb schema, main from the wise schema, data from the zcosmos schema.
7120. GAVO RegTAP Service
- ID:
- ivo://org.gavo.dc/rr/q/create
- Title:
- GAVO RegTAP Service
- Short Name:
- RegTAP mirror
- Date:
- 09 Aug 2024 09:51:04
- Publisher:
- The GAVO DC team
- Description:
- Tables containing the information in the IVOA Registry. To query these tables, use `our TAP service`_. For more information and example queries, see the `RegTAP specification`_. .. _our TAP service: /__system__/tap/run/info .. _RegTAP specification: http://www.ivoa.net/documents/RegTAP/