Analytical approximations of K-corrections in optical and near-infrared bands

Section: Galex Datamentioning

confidence: 99%

Predicting dust extinction properties of star-forming galaxies from Hα/UV ratio

Koyama

Kodama

Hayashi

et al. 2015

“…The second step is the correction for redshift. This is done using analytic approximations for the k-correction provided by Chilingarian et al (2010), which are functions of colours (corrected for extinction) and redshift. A meaningful application of this correction is possible for almost all galaxies in this catalogue, except for the galaxies in the Fornax Cluster and the galaxies in the Local group, where the available data is insufficient.…”

Section: Corrections For Extinction and Redshiftmentioning

confidence: 99%

An extensive catalogue of early-type galaxies in the nearby Universe

Dabringhausen

Fellhauer

2016

We present a catalogue of 1715 early-type galaxies from the literature, spanning the luminosity range from faint dwarf spheroidal galaxies to giant elliptical galaxies. The aim of this catalogue is to be one of the most comprehensive and publicly available collections of data on early-type galaxies. The emphasis in this catalogue lies on dwarf elliptical galaxies, for which some samples with detailed data have been published recently. For almost all of the early-type galaxies included in it, this catalogue contains data on their locations, distances, redshifts, half-light radii, the masses of their stellar populations and apparent magnitudes in various passbands. Data on metallicity and various colours are available for a majority of the galaxies presented here. The data on magnitudes, colours, metallicities and masses of the stellar populations is supplemented with entries that are based on fits to data from simple stellar population models and existing data from observations. Also, some simple transformations have been applied to the data on magnitudes, colours and metallicities in this catalog, in order to increase the homogeneity of this data. Estimates on the Sérsic profiles, internal velocity dispersions, maximum rotational velocities, dynamical masses and ages are listed for several hundreds of the galaxies in this catalogue. Finally, each quantity listed in this catalogue is accompanied with information on its source, so that users of this catalogue can easily exclude data that they do not consider as reliable enough for their purposes.

“…K-corrections for each galaxy were computed using the Kcorrections calculator (Chilingarian, Melchior & Zolotukhin 2010;Chilingarian & Zolotukhin 2012). Next we assigned a B/T ratio for each galaxy from the measurements of Lackner & Gunn (2012).…”

Section: B1 Galaxy Modelsmentioning

confidence: 99%

Gaiatransient detection efficiency: hunting for nuclear transients

Blagorodnova

Velzen

Harrison

et al. 2015

We present a study of the detectability of transient events associated with galaxies for the Gaia European Space Agency astrometric mission. We simulated the on-board detections, and on-ground processing for a mock galaxy catalogue to establish the properties required for the discovery of transient events by Gaia, specifically tidal disruption events (TDEs) and supernovae (SNe). Transients may either be discovered by the on-board detection of a new source or by the brightening of a previously known source. We show that Gaia transients can be identified as new detections on-board for offsets from the host galaxy nucleus of 0.1-0.5 arcsec, depending on magnitude and scanning angle. The Gaia detection system shows no significant loss of SNe at close radial distances to the nucleus. We used the detection efficiencies to predict the number of transients events discovered by Gaia. For a limiting magnitude of 19, we expect around 1300 SNe per year: 65% SN Ia, 28% SN II and 7% SN Ibc, and ∼20 TDEs per year.