Subject: galaxies, nearby / Publisher: CDS / Rights: public

ID:: ivo://CDS.VizieR/J/other/Ser/179.87
Title:: H{alpha} in HII regions of Holmberg IX
Short Name:: J/other/Ser/179.
Date:: 21 Oct 2021
Publisher:: CDS
Description:: We present observations of the nearby tidal dwarf galaxy Holmberg IX in M81 galaxy group in narrow band [SII] and Hα filters, carried out in March and November 2008 with the 2m RCC telescope at NAO Rozhen, Bulgaria. Our search for resident supernova remnants (identified as sources with enhanced [SII] emission relative to their Hα emission) in this galaxy yielded no sources of this kind, besides M&H 10-11 or HoIX X-1. Nevertheless, we found a number of objects with significant Hα emission that probably represent uncatalogued HII regions.

ID:: ivo://CDS.VizieR/J/other/Ser/187.11
Title:: HII regions in IC342 galaxy
Short Name:: J/other/Ser/187.
Date:: 21 Oct 2021
Publisher:: CDS
Description:: We present HII regions in the portion of the nearby spiral galaxy IC342. In this table we report coordinates, diameters, Hα and [SII] fluxes for 203 HII regions detected in two fields of view. The number of detected HII regions is 5 times higher than previously known in these two parts of the galaxy.

ID:: ivo://CDS.VizieR/J/other/Ser/184.19
Title:: NGC 300 candidate supernova remnants
Short Name:: J/other/Ser/184.
Date:: 21 Oct 2021
Publisher:: CDS
Description:: We present the results of a study of observational and identification techniques used for surveys and spectroscopy of candidate supernova remnants (SNRs) in the Sculptor Group galaxy NGC300. The goal of this study was to investigate the reliability of using [Sii]:Hα≥0.4 in optical SNR surveys and spectra as an identifying feature of extra-galactic SNRs (egSNRs), and also to investigate the effectiveness of the observing techniques (which are hampered by seeing conditions and telescope pointing errors) using this criterion in egSNR surveys and spectrographs. This study is based on original observations of these objects and archival data obtained from the Hubble Space Telescope which contained images of some of the candidate SNRs in NGC300. We found that the reliability of spectral techniques may be questionable and very high-resolution images may be needed to confirm a valid identification of some egSNRs.

ID:: ivo://CDS.VizieR/J/other/Ser/189.15
Title:: Point source catalogue of M31. DR2
Short Name:: J/other/Ser/189.
Date:: 21 Oct 2021
Publisher:: CDS
Description:: We present Data Release 2 of the Point Source Catalogue created from a series of previously constructed radio-continuum images of M31 at lambda=20cm (nu=1.4GHz) from archived VLA observations. In total, we identify a collection of 916 unique discrete radio sources across the field of M31. Comparing these detected sources to those listed by Gelfand et al. (<A HREF="http://simbad.cds.unistra.fr/simbad/sim-ref?bibcode=2004ApJS..155...89G%202004ApJS..155...89G">2004ApJS..155...89G 2004ApJS..155...89G</A>, Cat. <A HREF="http://cdsarc.u-strasbg.fr/cgi-bin/Cat?J/ApJS/155/89">J/ApJS/155/89</A>) at lambda=92cm, the spectral index of 98 sources has been derived. The majority (73%) of these sources exhibit a spectral index of α←0.6, indicating that their emission is predominantly non-thermal in nature, which is typical for background objects and Supernova Remnants (SNRs).

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