- ID:
- ivo://CDS.VizieR/J/MNRAS/390/466
- Title:
- GHASP: H{alpha} data cubes for 97 galaxies
- Short Name:
- J/MNRAS/390/466
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Gassendi HAlpha survey of SPirals survey (GHASP) consists of 3D H{alpha} data cubes for 203 spiral and irregular galaxies, covering a large range in morphological types and absolute magnitudes, for kinematics analysis. It is the largest sample of Fabry-Perot data published up to now. In order to provide an homogenous sample, reduced and analysed using the same procedure, we present in this paper the new reduction and analysis for a set of 97 galaxies already published in previous papers but now using the new data reduction procedure adopted for the whole sample. The GHASP survey is now achieved and the whole sample is reduced using the adaptive binning techniques based on Voronoi tessellations. We have derived H{alpha} data cubes from which are computed H{alpha} maps, radial velocity fields as well as residual velocity fields, position-velocity diagrams, rotation curves and kinematical parameters for almost all galaxies. The rotation curves, the kinematical parameters and their uncertainties are computed homogeneously using the new method based on the power spectrum of the residual velocity field. This paper provides the kinematical parameters for the whole sample. For the first time, the integrated H{alpha} profiles have been computed and are presented for the whole sample. The total H{alpha} fluxes deduced from these profiles have been used in order to provide a flux calibration for the 203 GHASP galaxies. This paper confirms the conclusions already drawn from half the sample concerning (i) the increased accuracy of position angles measurements using kinematical data, (ii) the difficulty to have robust determinations of both morphological and kinematical inclinations in particular for low-inclination galaxies and (iii) the very good agreement between the Tully-Fisher relationship derived from our data and previous determinations found in the literature.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/MNRAS/401/2113
- Title:
- GHASP: H{alpha} data cubes for 153 galaxies
- Short Name:
- J/MNRAS/401/2113
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Due to their large distances, high-redshift galaxies are observed at a very low spatial resolution. In order to disentangle the evolution of galaxy kinematics from low-resolution effects, we have used Fabry-Perot 3D H{alpha} data cubes of 153 nearby isolated galaxies selected from the Gassendi H{alpha} survey of SPirals (GHASP) to simulate data cubes of galaxies at redshift z=1.7 using a pixel size of 0.125" and a 0.5" seeing. We have derived H{alpha} flux, velocity and velocity dispersion maps.
- ID:
- ivo://CDS.VizieR/J/AJ/125/2427
- Title:
- 1.4GHz flux densities of Abell 2255 galaxies
- Short Name:
- J/AJ/125/2427
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Deep VLA 1.4GHz radio continuum imaging of Abell 2255 is presented. This cluster is among the better nearby candidates for rich cluster-cluster merger systems, with evidence including an elongated X-ray morphology, the presence of a radio halo, and substructure present in its galaxy distribution. Our radio observations reach an rms sensitivity of ~40{mu}Jy/beam, enabling us to detect (at 5{sigma}) star formation rates as low as 1.4M_{sun}_/yr from the center of the cluster out to a radial distance of 3h^-1^_75_Mpc. The radio data are complemented by optical imaging and a large spectroscopic database, allowing us to separate all galaxies with M_Rc_<=-20 0 into cluster members and foreground/background galaxies. The spectra are also used to associate the galaxies' radio emission with either star formation or active galactic nuclei (AGNs). We compare the resulting cluster radio galaxy population with those of 19 other nearby Abell clusters and find strong evidence for an increase in the frequency of radio galaxies in Abell 2255. This increase is seen in two separate types of galaxies: powerful radio AGNs and optically faint star-forming galaxies. The optical spectra of the latter often indicate current or recent starbursts, and these galaxies appear to be distributed along an axis perpendicular to the probable merger axis. We assess these factors in light of models of galaxy evolution and suggest that the cluster-cluster merger is responsible for triggering galaxy activity in Abell 2255.
- ID:
- ivo://CDS.VizieR/J/A+A/393/115
- Title:
- 86GHz SiO maser survey of late-type stars
- Short Name:
- J/A+A/393/115
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 86GHz (v=1, J=2-1) SiO maser line observations with the IRAM 30-m telescope of a sample of 444 late-type stars in the Inner Galaxy (-4{deg}<l<+30{deg}). These stars were selected on basis of their infrared magnitudes and colours from the ISOGAL and MSX catalogues. SiO maser emission was detected in 271 sources, and their line-of-sight velocities indicate that the stars are located in the Inner Galaxy. These new detections double the number of line-of-sight velocities available from previous SiO and OH maser observations in the area covered by our survey and are, together with other samples of e.g. OH/IR stars, useful for kinematic studies of the central parts of the Galaxy.
- ID:
- ivo://CDS.VizieR/J/A+AS/41/421
- Title:
- 1.4GHz survey in the Virgo region
- Short Name:
- J/A+AS/41/421
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Radio continuum observations made with the Westerbork Synthesis Radio Telescope at 1.4GHz are presented for 274 galaxies in the Virgo Cluster region. The observations are partly full syntheses and partly east-west strip distributions. For the 55 detected galaxies the emission is separated into central and extended components. A brief summary of the analysis is also given.
- ID:
- ivo://CDS.VizieR/J/A+A/562/A66
- Title:
- GIRAFFE Inner Bulge Survey (GIBS). I.
- Short Name:
- J/A+A/562/A66
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Galactic bulge is a massive, old component of the Milky Way. It is known to host a bar, and it has recently been demonstrated to have a pronounced boxy/peanut structure in its outer region. Several independent studies suggest the presence of more than one stellar populations in the bulge, with different origins and a relative fraction changing across the bulge area. This is the first of a series of papers presenting the results of the Giraffe Inner Bulge Survey, carried out at the ESO-VLT with the multifibre spectrograph FLAMES. Spectra of ~5000 red clump giants in 24 bulge fields have been obtained at resolution R=6500, in the infrared Calcium triplet wavelength region at ~8500{AA}. They are used to derive radial velocities and metallicities, based on new calibration specifically devised for this project. Radial velocities for another ~1200 bulge red clump giants, obtained from similar archive data, have been added to the sample. Higher resolution spectra have been obtained for ~450 additional stars at latitude b=-3.5, with the aim of investigating chemical abundance patterns variations with longitude, across the inner bulge. In total we present here radial velocities for 6494 red clump stars. We present here the target selection criteria, observing strategy and the catalogue with radial velocity measurements for all the target stars.
- ID:
- ivo://CDS.VizieR/J/A+A/622/L7
- Title:
- GJ143 and HD23472 radial velocity curves
- Short Name:
- J/A+A/622/L7
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We aim at the discovery of new planetary systems by exploiting the transit light-curve results from observations made in TESS orbital observatory Sectors 1 and 2 and validating them with precise Doppler measurements obtained from archival HARPS data. Taking advantage of the reported TESS transit events around GJ 143 (TOI 186) and HD 23472 (TOI 174), we modeled their HARPS precise Doppler measurements and derived orbital parameters for these two systems. Results. For the GJ 143 system, TESS has reported only a single transit, and thus its period is unconstrained from photometry. Our radial velocity analysis of GJ 143 reveals the full Keplerian solution of the system, which is consistent with an eccentric planet with a mass almost twice that of Neptune and a period of P_b_=35.59+/-0.01-days. Our estimates of the GJ 143 b planet are fully consistent with the transit timing from TESS. We confirm the two-planet system around HD 23472, which according to our analysis is composed of two Neptune-mass planets in a possible 5:3 mean motion resonance.
- ID:
- ivo://CDS.VizieR/J/A+A/595/A77
- Title:
- GJ676A radial velocity curve
- Short Name:
- J/A+A/595/A77
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The star GJ676A is an M0 dwarf hosting both gas-giant and super-Earth-type planets that were discovered with radial-velocity measurements. Using FORS2/VLT, we obtained position measurements of the star in the plane of the sky that tightly constrain its astrometric reflex motion caused by the super-Jupiter planet 'b' in a 1052-day orbit. This allows us to determine the mass of this planet to be M_b_= 6.7^+1.8^_-1.5_M_J_, which is ~40% higher than the minimum mass inferred from the radial-velocity orbit. Using new HARPS radial-velocity measurements, we improve upon the orbital parameters of the inner low-mass planets 'd' and 'e' and we determine the orbital period of the outer giant planet 'c' to be P_c_=7340-days under the assumption of a circular orbit. The preliminary minimum mass of planet 'c' is M_c_sini=6.8M_J_ with an upper limit of ~39M_J_ that we set using NACO/VLT high-contrast imaging. We also determine precise parallaxes and relative proper motions for both GJ676A and its wide M3 companion GJ676B. Although the system is probably quite mature, the masses and projected separations (~0.1-0.4") of planets 'b' and 'c' make them promising targets for direct imaging with future instruments in space and on extremely large telescopes. In particular, we estimate that GJ676A b and GJ676A ,c are promising targets for directly detecting their reflected light with the WFIRST space mission. Our study demonstrates the synergy of radial-velocity and astrometric surveys that is necessary to identify the best targets for such a mission.
- ID:
- ivo://CDS.VizieR/J/A+A/659/A17
- Title:
- GJ 3929 b RVs and activity indicators
- Short Name:
- J/A+A/659/A17
- Date:
- 02 Mar 2022 06:16:21
- Publisher:
- CDS
- Description:
- We report the discovery of GJ 3929 b, a hot Earth-sized planet orbiting the nearby M3.5 V dwarf star, GJ 3929 (G 180-18, TOI-2013). Joint modelling of photometric observations from TESS sectors 24 and 25 together with 73 spectroscopic observations from CARMENES and follow-up transit observations from SAINT-EX, LCOGT, and OSN yields a planet radius of R_b_=1.150+/-0.040R_e_, a mass of M_b_=1.21+/-0.42M_e_, and an orbital period of P_b_=2.6162745+/-0.0000030d. The resulting density of rho_b_=4.4+/-1.6g/cm^3^ is compatible with the Earth's mean density of about 5.5g/cm^3^. Due to the apparent brightness of the host star (J=8.7mag) and its small size, GJ 3929 b is a promising target for atmospheric characterisation with the JWST. Additionally, the radial velocity data show evidence for another planet candidate with P_[c]_=14.303+/-0.035d, which is likely unrelated to the stellar rotation period, P_rot_=122+/-13d, which we determined from archival HATNet and ASAS-SN photometry combined with newly obtained TJO data.
- ID:
- ivo://CDS.VizieR/J/A+A/556/A126
- Title:
- GJ667C Doppler and activity measurements
- Short Name:
- J/A+A/556/A126
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Since low-mass stars have low luminosities, orbits at which liquid water can exist on Earth-sized planets are relatively close-in, which produces Doppler signals that are detectable using state-of-the-art Doppler spectroscopy. GJ 667C is already known to be orbited by two super-Earth candidates. We have recently applied developed data analysis methods to investigate whether the data supports the presence of additional companions. We obtain new Doppler measurements from HARPS extracted spectra and combined them with those obtained from the PFS and HIRES spectrographs. We used Bayesian and periodogram-based methods to re-assess the number of candidates and evaluated the confidence of each detection. Among other tests, we validated the planet candidates by analyzing correlations of each Doppler signal with measurements of several activity indices and investigated the possible quasi-periodic nature of signals.
