2018ApJ...854L...6M

Query : 2018ApJ...854L...6M

2018ApJ...854L...6M - Astrophys. J., 854, L6-L6 (2018/February-2)

Gemini follow-up of two massive H I clouds discovered with the Australian Square Kilometer Array Pathfinder.

MADRID J.P., LEE-WADDELL K., SERRA P., KORIBALSKI B.S., SCHIRMER M., SPEKKENS K. and WANG J.

Abstract (from CDS):

Using the Gemini Multi Object Spectrograph (GMOS) we search for optical counterparts of two massive (∼109 M☉) neutral hydrogen clouds near the spiral galaxy IC 5270, located in the outskirts of the IC 1459 group. These two H I clouds were recently discovered using the Australian Square Kilometer Array Pathfinder (ASKAP). Two low surface brightness optical counterparts to one of these H I clouds are identified in the new Gemini data that reaches down to magnitudes of ∼27.5 mag in the g-band. The observed H I mass-to-light ratio derived with these new data, MHI/Lg=242, is among the highest reported to date. We are also able to rule out that the two H I clouds are dwarf companions of IC 5270. Tidal interactions and ram pressure stripping are plausible explanations for the physical origin of these two clouds.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: evolution - galaxies: groups: individual: IC 1459 - galaxies: individual: IC 5270 - stars: formation

Nomenclature: Fig. 2, Table 2: [MLS2018] ID N (Nos 1 to 2).

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LEDA 282475 Sy2 07 31 10.2261783240 -68 55 58.300230396   16.58   15.29 15.4 ~ 25 0
2 NGC 2442 LIN 07 36 23.7700545576 -69 31 50.997856332 11.47 11.15 10.42 9.71 10.4 ~ 243 1
3 M 65 GiP 11 18 55.9084654776 +13 05 32.300703672   9.6       ~ 458 1
4 NAME Leo Triplet IG 11 19 +13.2           ~ 132 1
5 M 66 AGN 11 20 15.0 +12 59 29 9.85 9.65 8.92     ~ 1509 4
6 NGC 3628 LIN 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 853 3
7 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1433 2
8 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1126 1
9 NAME HI 1225+01 HI 12 27 19 +01 30.4           ~ 84 1
10 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
11 NAME HI 1232+20 System HI 12 32.0 +20 25           ~ 7 0
12 AGC 249525 HVC 14 17 53.4 +17 32 42           ~ 6 0
13 NGC 7418 Sy1 22 56 36.1156121952 -37 01 47.845242192   11.66 11.39 10.66 11.3 ~ 172 2
14 IC 1459 rG 22 57 10.60682195 -36 27 43.9966421   10.96 11.85 9.34 10.3 ~ 652 2
15 NAME IC 1459 Group GrG 22 57 16 -36 25.4           ~ 37 0
16 [MLS2018] ID 2 Opt 22 57 45.92 -35 48 04.7           ~ 1 0
17 LEDA 644032 G 22 57 49.9 -35 50 08           ~ 2 0
18 [MLS2018] ID 1 Opt 22 57 54.00 -35 48 15.6           ~ 1 0
19 [SKK2015] North HI 22 57 54.64 -35 47 59.1           ~ 2 0
20 IC 5270 EmG 22 57 54.939 -35 51 28.93   13.00   11.85 12.5 ~ 117 1
21 [SKK2015] North-east HI 22 58 20.0 -35 46 30           ~ 2 0
22 NAME Vela Star Cloud ClG ~ ~           ~ 26 0
23 NAME NGC 3256 Group GrG ~ ~           ~ 11 0

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