2005A&A...444..723J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.15CEST10:13:59

2005A&A...444..723J - Astronomy and Astrophysics, volume 444, 723-738 (2005/12-4)

What is the temperature structure in the giant HII region NGC 588?

JAMET L., STASINSKA G., PEREZ E., GONZALEZ-DELGADO R.M. and VILCHEZ J.M.

Abstract (from CDS):

We present the results of an exhaustive study of the ionized gas in NGC 588, a giant HII region in the nearby spiral galaxy M33. This analysis uses a high number of diagnostics in the optical and infrared ranges. Four temperature diagnostics obtained with optical lines agree with a gas temperature of 11000K, while the [OIII] λ5007/λ88µm ratio yields a much lower temperature of ≃8000K. This discrepancy suggests the presence of large temperature inhomogeneities in the nebula. We investigated the cause of this discrepancy by constructing photoionization models of increasing complexity. In particular, we used the constraints from the Hα and Hβ surface brightness distributions and state-of-the-art models of the stellar ionizing spectrum. None of the successive attempts was able to reproduce the discrepancy between the temperature diagnostics, so the thermal balance of NGC 588 remains unexplained. We give an estimate of the effect of this failure on the O/H and Ne/O estimates and show that O/H is known to within ±0.2dex.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: HII regions - ISM: individual objects: NGC 588 - galaxies: individual: M33

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 588 HII 01 32 45.2 +30 38 54 14.59 14.40 14.44 14.89 15.16 ~ 116 1
2 [JPC2004] 1 * 01 32 45.23 +30 38 58.4           ~ 2 0
3 [JPC2004] 2 * 01 32 45.56 +30 38 54.4           ~ 2 0
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
5 NGC 604 HII 01 34 32.1 +30 47 01           ~ 544 0
6 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 983 0
7 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1736 1
8 GD 71 WD* 05 52 27.6197286025 +15 53 13.228639956 11.675 12.783 13.032 13.169 13.337 DA1.5 334 0
9 NGC 2363 G 07 28 29.83 +69 11 32.8   15.5       ~ 250 1
10 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 541 3
11 BD+28 4211 HS* 21 51 11.0220905905 +28 51 50.366090892 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 735 0

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2020.07.15-10:13:59

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