Contenuti
Immagini
Carica la tua immagine
DSS Images Other Images
Articoli relazionati
A Wide Area Survey for High-Redshift Massive Galaxies. II. Near-Infrared Spectroscopy of BzK-Selected Massive Star-Forming Galaxies
Results are presented from near-infrared spectroscopic observations of asample of BzK-selected, massive star-forming galaxies (sBzKs) at 1.5< z < 2.3 that were obtained with OHS/CISCO at the Subarutelescope and with SINFONI at the Very Large Telescope. Among the 28sBzKs observed, H? emission was detected in 14 objects, and for 11of them the [N II] ?6583 flux was also measured. Multiwavelengthphotometry was also used to derive stellar masses and extinctionparameters, whereas H? and [N II] emissions have allowed us toestimate star formation rates (SFRs), metallicities, ionizationmechanisms, and dynamical masses. In order to enforce agreement betweenSFRs from H? with those derived from rest-frame UV andmid-infrared, additional obscuration for the emission lines (thatoriginate in H II regions) was required compared to the extinctionderived from the slope of the UV continuum. We have also derived thestellar mass-metallicity relation, as well as the relation betweenstellar mass and specific SFR (SSFR), and compared them to the resultsin other studies. At a given stellar mass, the sBzKs appear to have beenalready enriched to metallicities close to those of local star-forminggalaxies of similar mass. The sBzKs presented here tend to have highermetallicities compared to those of UV-selected galaxies, indicating thatnear-infrared selected galaxies tend to be a chemically more evolvedpopulation. The sBzKs show SSFRs that are systematically higher, by upto ~2 orders of magnitude, compared to those of local galaxies of thesame mass. The empirical correlations between stellar mass andmetallicity, and stellar mass and SSFR are then compared with those ofevolutionary population synthesis models constructed either with thesimple closed-box assumption, or within an infall scenario. Within theassumptions that are built-in such models, it appears that a shorttimescale for the star formation (sime100 Myr) and large initial gasmass appear to be required if one wants to reproduce both relationssimultaneously.Based on data collected at the Subaru telescope, which is operated bythe National Astronomical Observatory of Japan (S04A-081, S05A-098), andon observations collected at the European Southern Observatory, Paranal,Chile (075.A-0439).
| A catalogue of eclipsing variables
A new catalogue of 6330 eclipsing variable stars is presented. Thecatalogue was developed from the General Catalogue of Variable Stars(GCVS) and its textual remarks by including recently publishedinformation about classification of 843 systems and making correspondingcorrections of GCVS data. The catalogue1 represents thelargest list of eclipsing binaries classified from observations.
| Veraenderliche Sterne in Circinus.
Not Available
| Up-to-Date Linear Elements of Eclipsing Binaries
About 1800 O-C diagrams of eclipsing binaries were analyzed and up-todate linear elements were computed. The regularly updated ephemerides(as a continuation of SAC) are available only in electronic form at theInternet address: http://www.as.ap.krakow.pl/ephem/.
| The 74th Special Name-list of Variable Stars
We present the Name-list introducing GCVS names for 3153 variable starsdiscovered by the Hipparcos mission.
| A spectral survey of the southern Milky Way 1 : general description and catalogue 1 (l=306 -318 degrees).
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974A&AS...16..445S&db_key=AST
| Bright Southern BV-Stars
Not Available
|
Sottometti un nuovo articolo
Link relazionati
Sottometti un nuovo link
Membro dei seguenti gruppi:
|
Osservazione e dati astrometrici
| Costellazione: | Compasso |
| Ascensione retta: | 14h47m48.96s |
| Declinazione: | -60°25'26.1" |
| Magnitudine apparente: | 8.958 |
| Distanza: | 436.681 parsec |
| Moto proprio RA: | -1.9 |
| Moto proprio Dec: | -4.5 |
| B-T magnitude: | 9.203 |
| V-T magnitude: | 8.979 |
Cataloghi e designazioni:
|
