Person: Zamorano Calvo, Jaime
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First Name
Jaime
Last Name
Zamorano Calvo
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Físicas
Department
Física de la Tierra y Astrofísica
Area
Astronomía y Astrofísica
Identifiers
6 results
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Now showing 1 - 6 of 6
Item Photometric and morphological analysis of UCM galaxies .2. Statistical results and interpretation(Astronomy & astrophysics supplement series, 1996) Vitores, A. G.; Zamorano Calvo, Jaime; Rego Fernández, Manuel; Gallego Maestro, Jesús; Alonso, O.We present the results of Thuan & Gunn r CCD imaging observations of the Universidad Complutense de Madrid (UCM) sample of emission-line galaxies (ELGs) selected by the presence of H_α emission in low resolution objective-prism spectra. In this work, a total of 212 objects from the UCM survey have been photometrically and morphologically characterized. In a previous paper, the observations, basic reductions and morphological classification for the UCM objects were presented. Here, we analyse the statistical properties of the sample and their interpretations. The main results obtained are as follows: (1) Our survey is specially effective in the detection of ELGs smaller and less luminous than normal spirals (the median values of the UCM sample are M_r = -20.6 and D_24 = 19.4 kpc, for H_0 = 50 km s^-1 Mpc^-1). (2) The sample presents a very heterogeneous morphological population of galaxies. There is a clear predominance of late-type galaxies, with 66% being Sb or later. (3) We have found a set of galaxies specially interesting. In particular, we propose 9 candidates to BCD (blue compact dwarf galaxy), five of them previously unknown. (4) About 10% of the ELGs of the sample show typical parameters of S0 types, and in the subsample of 16 UCM interacting galaxies, 25% are S0 type galaxies. (5) In the set of UCM galaxies inside the Coma cluster, 71% exhibit Hubble types Sb or later.Item An automatic approach for selecting new Hα emission-line galaxies(Astronomy from wide-field imagings, 1994) Alonso, O.; Zamorano Calvo, Jaime; Rego Fernández, Manuel; Gallego Maestro, Jesús; Vitores, A.G.The most unambiguous way to discover new emission-line galaxies (ELGs) is directly by the presence of their lines, using objective-prism plates of adequate resolution. The first survey using this technique was developed by Smith in 1975 with the 0.6 m CTIO Curtis Schmidt Telescope. The Universidad Complutense de Madrid (UCM) is carrying out a survey of ELGs with the Schmidt Telescope at Calar Alto (Almería, Spain) using the presence of Ha in emission in IIIa-F prism plates as selection criterion. The observational procedure and results are described in Rego et al. 1989; Zamorano et al. 1990; Zamorano et al. 1993. The standard procedure is to scan the plates by eye, with a low-power binocular microscope. The use of different subjective criteria in the visual inspection can produce biased samples. Moreover, the visual scan does not produce any quantitative measure but only a sample of candidates. Therefore, in order to obtain an observer-independent sample and to extract the largest amount of information from the original plates, 2 plates have been scanned with the MAMA machine 1 (Guibert & Moreau 1991; Moreau 1992) with the aim of developing an automatic procedure to detect ELGs spectra.Item Survey for emission-line galaxies: Universidad Complutense de Madrid list 2(Astrophysical journal supplement series, 1996) Zamorano Calvo, Jaime; Gallego Maestro, Jesús; Rego Fernández, Manuel; Vitores, A. G.; Alonso, O.A low-dispersion objective-prism survey for low-redshift emission-line galaxies (ELGs) is being carried out by the Universidad Complutense de Madrid with the Schmidt telescope at the German-Spanish Observatory of Calar Alto (Almeria, Spain). A 4° full-aperture prism, which provides a dispersion of 1950 Å mm^-1, and IIIa-F emulsion combination has been used to search for ELGs selected by the presence of H_α emission in their spectra. A compilation of descriptions and positions, along with finding charts, is presented for 103 emission-line objects. This is the second list, which contains objects located ina region of the sky covering 201.4 deg^2 in seven fields near α = 15^h and δ = 25°.Item Automatic selection of new Hα emission-line galaxies using MAMA(Astronomy & astrophysics supplement series, 1995) Alonso, O.; Zamorano Calvo, Jaime; Rego Fernández, Manuel; Gallego Maestro, JesúsA full set of algorithms for the automatic analysis of low-resolution objective-prism spectra has been developed with the aim of finding new emission-line galaxies (ELGs) candidates from the Universidad Complutense de Madrid (UCM) survey prism plates. An objective-prism plate and a direct plate, used for pairing objects and to perform star-galaxy separation, have been scanned with the MAMA machine. The plates were taken in the red region of the spectrum, using the Hα+[NII] blend in emission as selection criterion. The procedure, applied to digitized spectra, is able to automatically select ELGs candidates. Density to intensity transformation has not been used in our method; the detection of the emission is performed applying three independent criteria over the one-dimensional spectra in raw data. The automatically selected sample is compared with that obtained after a careful visual scan. Spectroscopic observations at moderate spectral resolution are presented for the whole sample of candidates in order to study the drawbacks and the biases of both methods.Item Survey for emission-line galaxies: Universidad Complutense de Madrid list 3(Astrophysical journal supplement series, 1999) Alonso, O.; García Dabó, C. E.; Zamorano Calvo, Jaime; Gallego Maestro, Jesús; Rego Fernández, ManuelA new low-dispersion objective-prism search for low-redshift (z<0.045) emission-line galaxies (ELGs) has been carried out by the Universidad Complutense de Madrid using the Schmidt Telescope at the Calar-Alto Observatory. This is a continuation of the UCM Survey, which was performed by visual selection of candidates in photographic plates via the presence of the Hα+[N II] λ6584 blend in emission. In making this new list we have applied an automatic procedure, fully developed by us, for selecting and analyzing ELG candidates on the digitized images obtained with the Machine Automatique à Mesurer pour l'Astronomie (MAMA). The analyzed region of the sky covers 189 deg^2 in nine fields near α=14^h and 17^h, δ=25 ºC. The final sample contains 113 candidates. Special effort has been made to obtain a large amount of information directly from our uncalibrated plates by using several external calibrations. The parameters obtained for the ELG candidates allow us to study the statistical properties of the sample.Item Observations of a complete sample of Hα emission-line galaxies. Long-slit spectroscopy of galaxies in UCM lists 1 and 2(Astronomy & astrophysics supplement series, 1996) Gallego Maestro, Jesús; Zamorano Calvo, Jaime; Rego Fernández, Manuel; Alonso, O.; Vitores, A. G.Spectroscopic observations for the full sample of Her emission-line galaxy candidates (ELGs) from the Universidad Complutense de Madrid objective-prism survey Lists 1 and 2 have been obtained in order to investigate fully the properties of the survey constituents as well as the selection characteristics and completeness limits of the survey itself. The spectroscopic data include redshifts, line fluxes, equivalent widths, emission-line ratios, optical reddening estimates and synthesized color indexes. We find that 74% of the objects in this sample do exhibit emission Lines. We compare our observational data, with parameters given in the published survey lists in order to assess the usefulness of the latter. The different emission-line galaxies have been classified according to their spectra in several groups. Gray-scale images of the CCD spectra near the main emission lines, spatial profiles at the continuum and the Line for [OIII] λ5007 and Hα lines, as well as plots of the coadded spectra of selected galaxies are presented, and a number of peculiar objects are described.