2008MNRAS.385.1965H


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.18CEST03:22:36

2008MNRAS.385.1965H - Mon. Not. R. Astron. Soc., 385, 1965-1972 (2008/April-3)

Is NGC 3108 transforming itself from an early- to late-type galaxy - an astronomical hermaphrodite?

HAU G.K.T., BOWER R.G., KILBORN V., FORBES D.A., BALOGH M.L. and OOSTERLOO T.

Abstract (from CDS):

A common feature of hierarchical galaxy formation models is the process of `inverse' morphological transformation: a bulge dominated galaxy accretes a gas disc, dramatically reducing the system's bulge-to-disc mass ratio. During their formation, present-day galaxies may execute many such cycles across the Hubble diagram.

A good candidate for such a `hermaphrodite' galaxy is NGC 3108: a dust-lane early-type galaxy which has a large amount of HI gas distributed in a large-scale disc. We present narrow-band Hα and R-band imaging, and compare the results with the HI distribution from the literature. The emission is in two components: a nuclear bar and an extended disc component which coincides with the HI distribution. This suggests that a stellar disc is currently being formed out of the HI gas. The spatial distributions of the Hα and HI emission and the HII regions are consistent with a barred spiral structure, extending some 20 kpc in radius. We measure an extinction-corrected star formation rate (SFR) of 0.42Msolar/yr. The luminosity function of the HII regions is similar to other spiral galaxies, with a power-law index of -2.1, suggesting that the star formation mechanism is similar to other spiral galaxies.

We measured the current disc mass and find that it is too massive to have been formed by the current SFR over the last few Gyr. It is likely that the SFR in NGC 3108 was higher in the past. With the current SFR, the disc in NGC 3108 will grow to be ∼6.2 x 109Msolar in stellar mass within the next 5.5 Gyr. While this is substantial, the disc will be insignificant compared with the large bulge mass: the final stellar mass disc-to-bulge ratio will be ∼0.02. NGC 3108 will fail to transform into anything resembling a spiral without a boost in the SFR and additional supply of gas.


Abstract Copyright: ©2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: general - galaxies individual: NGC 3108 - galaxies: peculiar - galaxies: spiral - galaxies: structure

Simbad objects: 18

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Number of rows : 18

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 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11311 1
2 NGC 395 As* 01 05 08.0 -71 59 49           ~ 19 1
3 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5292 1
4 NGC 604 HII 01 34 32.1 +30 47 01           ~ 556 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15357 1
6 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1790 1
7 HD 289002 * 06 45 13.3726265810 +02 08 14.688016523 10.06 10.62 10.44     B1 233 0
8 NGC 2685 Sy2 08 55 34.7056265191 +58 44 03.877798862   13.68 12.70     ~ 410 1
9 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4062 5
10 LGG 187 GrG 10 01 47.0 -31 34 14           ~ 2 0
11 NGC 3108 GiG 10 02 29.022 -31 40 38.57   12.48   11.03   ~ 59 0
12 M 104 LIN 12 39 59.43185 -11 37 22.9954 9.51 9.55 8.00 8.05   ~ 1301 3
13 NGC 4672 GiG 12 46 15.736 -41 42 21.45   14.12 14.25 12.60 12.9 ~ 71 0
14 NGC 4698 Sy2 12 48 22.9112380605 +08 29 14.648866444   13.24 12.27     ~ 451 0
15 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4096 3
16 UGC 10043 GiP 15 48 41.188 +21 52 09.79   14.80       ~ 86 1
17 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1460 0
18 NAME Local Group GrG ~ ~           ~ 7264 0

    Equat.    Gal    SGal    Ecl

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2021.05.18-03:22:36

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