2015ApJ...800L..15B


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.09CEST05:57:52

2015ApJ...800L..15B - Astrophys. J., 800, L15 (2015/February-2)

H II regions within a compact high velocity cloud. A nearly starless dwarf galaxy?

BELLAZZINI M., MAGRINI L., MUCCIARELLI A., BECCARI G., IBATA R., BATTAGLIA G., MARTIN N., TESTA V., FUMANA M., MARCHETTI A., CORRENTI M. and FRATERNALI F.

Abstract (from CDS):

Within the SECCO survey we identified a candidate stellar counterpart to the Ultra Compact High Velocity Cloud (UCHVC) HVC274.68+74.70-123 that was suggested by Adams et al. to be a possible mini halo within the Local Group of galaxies. The spectroscopic follow-up of the brightest sources within the candidate reveals the presence of two H ii regions whose radial velocity is compatible with a physical association with the UVHVC. The available data do not allow us to give a definite answer on the nature of the newly identified system. A few alternative hypotheses are discussed. However, the most likely possibility is that we have found a new faint dwarf galaxy residing in the Virgo cluster of galaxies, which we name SECCO 1. Independently of its actual distance, SECCO 1 displays a ratio of neutral hydrogen mass to V luminosity of MH1/LV ≳ 20, by far the largest among local dwarfs. Hence, it appears to be a nearly starless galaxy and it may be an example of the missing links between normal dwarfs and the dark mini halos that are predicted to exist in large numbers according to the currently accepted cosmological model.

Abstract Copyright:

Journal keyword(s): H ii regions - galaxies: dwarf - galaxies: star formation

Nomenclature: Text, Table 2: SECCO N (No. 1). Figs 2-3, Table 1: [BMM2015] SNA (Nos S2-S3, S3A-S3B).

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 595 HII 01 33 33.53 +30 41 29.8           ~ 193 0
2 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5290 1
3 NAME Leo T dSph G 09 34 53.4 +17 03 05     15.1     ~ 322 0
4 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 165 0
5 SECCO 1 G 12 21 53.96 +13 27 36.5     19.9     ~ 11 0
6 AGC 226067 G 12 21 55.2 +13 28 10           ~ 14 0
7 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6028 0
8 NAME Local Group GrG ~ ~           ~ 7253 0

    Equat.    Gal    SGal    Ecl

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2021.05.09-05:57:52

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