- ID:
- ivo://CDS.VizieR/J/MNRAS/368/253
- Title:
- Faint emission lines in M16, M20, NGC 3603
- Short Name:
- J/MNRAS/368/253
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present deep echelle spectrophotometry of the Galactic HII regions M16, M20 and NGC 3603. The data have been taken with the Very Large Telescope Ultraviolet-Visual Echelle Spectrograph in the 3100-10400{AA} range. We have detected more than 200 emission lines in each region. Physical conditions have been derived using different continuum and line intensity ratios. We have derived He^+^, C^++^ and O^++^ abundances from pure recombination lines as well as collisionally excited lines (CELs) for a large number of ions of different elements.
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- ID:
- ivo://CDS.VizieR/J/AJ/127/2565
- Title:
- Faint FIRST variable radio sources
- Short Name:
- J/AJ/127/2565
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- A sample of 123 radio sources that exhibit significant variations at 1.4GHz on a 7 year baseline has been created using FIRST VLA B-configuration data from 1995 and 2002 on a strip at {delta}=0 near the south Galactic cap. This sample spans the range of radio flux densities from ~2 to 1000mJy. It presents both in size and radio flux density range a unique starting point for variability studies of galaxies and quasars harboring lower luminosity active galactic nuclei (AGNs).
- ID:
- ivo://CDS.VizieR/J/MNRAS/380/281
- Title:
- Faint galactic satellites spectroscopic survey
- Short Name:
- J/MNRAS/380/281
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a spectroscopic survey of the recently discovered faint Milky Way satellites Bootes, Ursa Major I, Ursa Major II and Willman 1 (Wil1). Using the DEep Imaging Multi-Object Spectrograph mounted on the Keck II telescope, we have obtained samples that contain from ~15 to ~85 probable members of these satellites for which we derive radial velocities precise to a few km/s down to i~21-22. About half of these stars are observed with a high enough signal-to-noise ratio to estimate their metallicity to within +/-0.2dex. The characteristics of all the observed stars are made available, along with those of the Canes Venatici I dwarf galaxy that have been analysed in a companion paper.
- ID:
- ivo://CDS.VizieR/VII/208
- Title:
- Faint Galaxies at the North Galactic Pole
- Short Name:
- VII/208
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The North Galactic Pole Canada-France-Hawaii Telescope Catalogue of faint galaxies is made available. We provide positions, photometric and structural parameters for more than 50000 galaxies. The J and F magnitudes were obtained from IIIaJ and IIIaF CFHT prime focus plates respectively. This catalogue have been used in many studies of faint galaxy properties. Galaxy counts, colour distributions and clustering properties of faint galaxies have been obtained with these data. Statistical properties of stars have been studied as well. For details refer to Infante and Pritchet (1992ApJS...83..237I), Pritchet and Infante (1992ApJ...399L..35P), Infante (1994A&A...282..353), Infante (1994A&AS..107..413I) and Infante and Pritchet (1995ApJ...439..565I). The magnitude errors range from: +/-0.3mag at J=24 to less than +/-0.1 at J=20 +/-0.3mag at F=23 to less than +/-0.1 at F=19 The rms uncertainty in the zero points is 0.022 (J) and 0.038 (F)
- ID:
- ivo://CDS.VizieR/J/MNRAS/297/885
- Title:
- Faint galaxies KIc photometry
- Short Name:
- J/MNRAS/297/885
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The excess number of blue galaxies at faint magnitudes is a subject of much controversy. Recent Hubble Space Telescope results have revealed a plethora of galaxies with peculiar morphologies tentatively identified as the evolving population. We report the results of optical spectroscopy and near-infrared photometry of a sample of faint HST galaxies from the Medium Deep Survey to ascertain the physical properties of the faint morphological populations. We find four principal results. First, the population of objects classified as 'peculiar' are intrinsically luminous in the optical (M_B_~-19). Secondly these systems tend to be strong sources of [OII] line luminosity. Thirdly the optical-infrared colours of the faint population (a) confirm the presence of a population of compact blue galaxies and (b) show the stellar populations of irregular/peculiar galaxies encompass a wide range in age. Finally a surface-brightness comparison with the local galaxy sample of Freiz et al. (1996AJ....111..174F) shows that these objects are not of anomalously low surface brightness, rather we find that all morphological classes have evolved to a higher surface brightness at higher redshifts (z>0.3).
- ID:
- ivo://CDS.VizieR/J/MNRAS/235/827
- Title:
- Faint galaxy redshift survey
- Short Name:
- J/MNRAS/235/827
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Using the fibre optic coupler at the Anglo-Australian Observatory, we have completed a new faint galaxy redshift survey. Intermediate dispersion spectra with resolution ~4{AA} have been gathered for over 200 field galaxies selected in apparent magnitude slices between 20.0<b_J_<21.5mag in five high-latitude fields. Redshift completeness is 85% and the mean redshift agrees well from field to field.
- ID:
- ivo://CDS.VizieR/VII/205
- Title:
- Faint Interacting Galaxies
- Short Name:
- VII/205
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have carried out an extensive survey of faint galaxies in order to examine the rise in the merger rate with redshift and to study the statistical relations between close interacting galaxies and the field galaxy population. In paper I (1997ApJS..108...99D), we present the catalog of faint pairs and groups of galaxies of 46 equatorial fields taken with the Cerro Tololo Inter-American Observatory 4 m prime focus. The data set contains 73,988 galaxies, covering a total area of 2.23deg^2^. We have found 1751 isolated pairs and 30 groups of galaxies within 19 <Rmag<22 and 2"<{theta}<6" in this area. Our results clearly show an increase in pairs and groups of galaxies in comparison with a randomly generated catalog. We have completed the second part of an extensive survey of faint pairs and groups of galaxies in order to study galaxy evolution at intermediate redshifts. In paper II (1997ApJS..110..227D) we present the second catalog of faint interacting galaxies of 49 equatorial fields taken with the Cerro Tololo Inter-American Observatory 4 m prime focus camera. The data set contains 11,297 galaxies within 19<Rmag<22, covering a total area of 2.63deg^2^. We have found 1461 isolated pairs and 30 groups with separations 2"<{theta}<6". Our results confirm the excess of galaxies in pairs and groups found in the first catalog (Infante, de Mello, & Menanteau 1996ApJ...469L..85I; de Mello, Infante, & Menanteau 1997ApJS..108...99D). The two catalogs together cover an area of 4.86deg^2^ in the sky.
- ID:
- ivo://CDS.VizieR/J/MNRAS/470/1512
- Title:
- Faint LSB galaxy cand. in Perseus cluster
- Short Name:
- J/MNRAS/470/1512
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the detection of 89 low surface brightness (LSB), and thus low stellar density galaxy candidates in the Perseus cluster core, of the kind named 'ultra-diffuse galaxies', with mean effective V-band surface brightnesses 24.8-27.1mag/arcsec^2^, total V-band magnitudes -11.8 to -15.5mag, and half-light radii 0.7-4.1kpc. The candidates have been identified in a deep mosaic covering 0.3deg^2^, based on wide-field imaging data obtained with the William Herschel Telescope. We find that the LSB galaxy population is depleted in the cluster centre and only very few LSB candidates have half-light radii larger than 3kpc. This appears consistent with an estimate of their tidal radius, which does not reach beyond the stellar extent even if we assume a high dark matter content (M/L=100). In fact, three of our candidates seem to be associated with tidal streams, which points to their current disruption. Given that published data on faint LSB candidates in the Coma cluster --with its comparable central density to Perseus-- show the same dearth of large objects in the core region, we conclude that these cannot survive the strong tides in the centres of massive clusters.
- ID:
- ivo://CDS.VizieR/J/AJ/124/1283
- Title:
- Faint Markarian galaxies of SBS. III.
- Short Name:
- J/AJ/124/1283
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We continue our program of spectroscopic observations of objects from the Second Byurakan Survey (SBS). This survey contains more than 3600 objects with m_pg_<19.5mag, half of them being galaxies and the other half being starlike objects. The aim of this work is to compile a complete sample of faint (B<17) Markarian galaxies. Here we present spectroscopic data for 185 galaxies, obtained with the 6m telescope of the Special Astrophysical Observatory in Russia and the 2.1m telescope of the Guillermo Haro Astrophysical Observatory in Mexico. In the present subsample, we find three new Seyfert 1 galaxies (SBS 0654+598, 1118+541, and 1320+551); one narrow-line Seyfert 1 (SBS 0748+499), one Seyfert 2 (SBS 0925+585), and three Seyfert2/LINER (SBS 0811+584, 1344+527, and 1428+529) galaxies; 12 LINERs; 13 blue compact dwarf galaxies; 65 starburst nuclei; 85 emission-line galaxies; and two absorption galaxies. Relevant astrophysical parameters (magnitude, redshift, relative intensities of emission lines, etc.) are given for the observed galaxies.
- ID:
- ivo://CDS.VizieR/J/AJ/130/923
- Title:
- Faint radio sources in the NOAO Bootes field
- Short Name:
- J/AJ/130/923
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- As a step toward investigating the parsec-scale properties of faint extragalactic radio sources, the Very Long Baseline Array (VLBA) was used at 5.0GHz to obtain phase-referenced images of 76 sources in the NOAO Bootes field. These 76 sources were selected from the Faint Images of the Radio Sky at Twenty cm (FIRST) catalog to have peak flux densities above 10mJy at 5" resolution and deconvolved major diameters of less than 3" at 1.4GHz. Of these faint radio sources, 57 were identified with accretion-powered radio galaxies and quasars brighter than 25.5mag in the optical I band. On Very Large Array (VLA) scales at 1.4GHz, a measure of the compactness of the faint sources (the ratio of the peak flux density from FIRST to the integrated flux density from the NRAO VLA Sky Survey catalog) spans the full range of possibilities arising from source-resolution effects.