Survey for Emission-Line Galaxies: Universidad Complutense de Madrid List 2

Photometric and morphological analysis of UCM galaxies. I. Observations and reductions. Morphological classifications

“…Then, the data were converted to photometric magnitudes using the extinction and zero point constants derived from observations of a set of standard stars from the lists of Thuan & Gunn (1976) and Kent (1985a) taken along each night. Table 2 presents the apparent magnitudes (the listed errors include photometric calibrations and poissonian contributions) which have been converted to absolute magnitudes using Ho = 50 km s-l Mpc-' and the redshift measured in the spectra, when available, by Gallego et al (1995). These values were corrected for galactic extinction using A, = 2.51 E ( B -V ) , where E ( B -V ) was determined from the Burstein & Heiles (1982) maps at the galactic coordinates of each UCM object.…”

“…Since the BCD category usually encompasses objects with a wide variety of properties, in the present work we classify as BCDs those galaxies having al1 of the following properties: compact appearance in the direct image, linear size (024) lower than 10 kpc, luminosity M, > -19, and photometric parameters typical of later Hubble types. Moreover, since the true nature as BCD must be spectroscopically confirmed, the spectral information available for these candidates (Gallego et al 1995) has also been used. After a detailed analysis of the types given by each criterion, which in a number of cases do not agree, and using the information from the inspection of the direct image, we have assigned a final morphological type to each object of the sample.…”

“…The specific details of the UCM survey have already been summarized in the first and second lists 1995) of Our exploration. Since the spectroscopic results of the sample are presented in Gallego et al (1995), we will concentrate here in the photometric characteristics of the survey.…”

“…Send offprant requests to: M. Reg0 *Based on observations collected at the German-Spanish Astronomical Center, Calar Alto, Spain, operated by the MaxPlanck-Institut für Astronomie (MPIA), Heidelberg, jointly with the Spanish National Commision for Astronomy **Tables 2-7 are only available at the CDS via ftp 130.79.128.5 In this Paper, we analyse a sample of 212 ELGs candidates extracted from UCM lists 1 and 2 (Zamorano et al , 1995. The obtained CCD images have been used (1) to compute basic photometric properties (size and luminosity) of the UCM objects; (2) to obtain, via surface photometry, a set of specific photometric parameters (bulge+disk decomposition, concentration indices and mean surface brightnesses), and (3) to determine the Hubble type of these ELGs.…”

“…The obtained CCD images have been used (1) to compute basic photometric properties (size and luminosity) of the UCM objects; (2) to obtain, via surface photometry, a set of specific photometric parameters (bulge+disk decomposition, concentration indices and mean surface brightnesses), and (3) to determine the Hubble type of these ELGs. In Paper II (Vitores et al 1995) a statistical analysis of the UCM sample will be presented: In particular, we will make a comparison with other samples of normal and emission-line galaxies and we will analyse the possible influence of the environment in the presence and nature of ELGs.…”