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FIGGS 2: An HI survey of extremely faint irregular galaxies

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Abstract

We present observations and first results from the FIGGS2 survey. FIGGS2 is an extension of the earlier Faint Irregular Galaxies GMRT survey (FIGGS) towards faint luminosity end. The sample consists of 20 galaxies, 15 of which were detected in HI 21 cm line using the Giant Meterwave Radio Telescope (GMRT). The median blue band magnitude of our sample is approximately −11.m 6, which is more than one magnitude fainter than earlier FIGGS survey. From our GMRT observations we found that, for many of our sample galaxies, the HI disks are offset from their optical disks. The HI diameters of the FIGGS2 galaxies show a tight correlation with their HI mass. The slope of the correlation is 2.08 ± 0.20 similar to what is found for FIGGS galaxies. We also found that for almost all galaxies, the HI disks are larger than the optical disks which is a common trend for dwarf or spiral galaxies. The mean value of the ratio of HI to optical diameter is about 1.54.

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Authors and Affiliations

  1. NCRA-TIFR, Post Bag 3, Ganeshkhind, Pune, 411 007, India

    N. N. Patra & J. N. Chengalur

  2. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, 369167, Russia

    I. D. Karachentsev & M. E. Sharina

Authors
  1. N. N. Patra
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  2. J. N. Chengalur
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  3. I. D. Karachentsev
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  4. M. E. Sharina
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Correspondence to N. N. Patra.

Additional information

Published in Russian in Astrofizicheskii Byulleten’, 2016, Vol. 71, No. 4, pp. 439–452.

The text was submitted by the authors in English.

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Patra, N.N., Chengalur, J.N., Karachentsev, I.D. et al. FIGGS 2: An HI survey of extremely faint irregular galaxies. Astrophys. Bull. 71, 408–421 (2016). https://doi.org/10.1134/S1990341316040040

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  • DOI: https://doi.org/10.1134/S1990341316040040

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