In total the core region of the Coma cluster covered with H α observations contains 203 early-type galaxies (E+S0+S0a ETGs), 27 late-type galaxies (LTGs), 17 of which show evidence of extended H α. We report the positive detection of extended, asymmetric H α emission associated with each of these 1. Inspired by these tentative detections we decided to devote approximately one night of observation at the SPM observatory to each of these galaxies in April, 2018. However this observation hinted at possible unilateral H α emission behind 3 additional galaxies J125750.2+281013, J125756.7+275930, and J125757.7+280342 in the northwestern part of the cluster. commun.), however the absence of a corresponding broadband ( r) exposure to estimate and subtract the continuum emission, prevented a proper analysis of this field. Another H α Subaru pointing of the NW region of the Coma cluster was obtained in 2014 (Yagi, priv. (2015) found a significant displacement of the neutral hydrogen from stars this displacement is indicative of ram pressure stripping. The bright galaxy NGC 4921 was not included, but by combining Hubble Space Telescope (HST) imaging with HI line mapping, Kenney et al. Similarly it did not cover the cluster eastward of RA 13 h01 m00 s. (2012) revealed the presence of an H α trailing emission of 65 kpc projected length. For example the bright galaxy NGC 4848 was not covered by these observations and a special five hour pointing with the San Pedro Martir (SPM) 2.1 m telescope by Fossati et al. (2010), however, did not cover westward of RA 12 h58 m25 s. ( 2012 in the NW shown in filled black) and NGC4921 ( Kenney et al. 2010 region within black lines), plus the 4 galaxies observed in this work or by Fossati et al. Sky distribution of the core of the Coma cluster surveyed in H α by ( Yagi et al. The 27 LTG galaxies, among these the 17 with extended H α tails, have kinematic properties that are different from the rest of the early-type galaxy population of the core of the Coma cluster, as they deviate in the phase-space diagram |Δ V|/ σ versus r/ R 200. This brings the number sources with H α trails to 17 gaseous tails out of 27 (63%) late-type galaxies (LTG) members of the Coma cluster with direct evidence of ram pressure stripping. We added these 3 new sources of extended ionized gas to the 12 previously found, NGC 4848, and NGC 4921 whose ram pressure stripping is certified by HI asymmetry. One-sided tails of H α emission of 10–20 kpc projected size were detected, suggesting an ongoing ram pressure stripping event. We therefore devoted one full night of H α observation to each of the three galaxies using the San Pedro Martir 2.1 m telescope. However the lack of a simultaneous r-band exposure, together with the presence of strong stellar ghosts in the Subaru images, prevented us from quantifying the detections. Hints that these galaxies possess an extended component were found in earlier, deeper H α observations carried out with the Subaru telescope. We report the detection of H α trails behind three new intermediate-mass irregular galaxies in the NW outskirts of the nearby cluster of galaxies Abell 1656 (Coma). Yoshida 4ġ Università degli Studi di Milano-Bicocca, Piazza della Scienza 3, 20126 Milano, ItalyĮ-mail: Instituto de Astronomia, UNAM, Km 107 Carretera Tijuana-Ensenada, 22860 Ensenada, B.C., Mexicoģ Aix-Marseille Université, CNRS, CNES LAM, Laboratoire d’Astrophysique de Marseille, Marseille, FranceĤ Subaru Telescope, National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 650 A’ohoku Place, Hilo, HI, 96720 Astronomical objects: linking to databases.Including author names using non-Roman alphabets. Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes
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