2012A&A...539A.127I


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.25CET04:50:17

2012A&A...539A.127I - Astronomy and Astrophysics, volume 539A, 127-127 (2012/3-1)

New insights on Stephan's Quintet: exploring the shock in three dimensions.

IGLESIAS-PARAMO J., LOPEZ-MARTIN L., VILCHEZ J.M., PETROPOULOU V. and SULENTIC J.W.

Abstract (from CDS):

We study the ionized gas emission from the large scale shock region of Stephan's Quintet (SQ). We carried out integral field unit (IFU) optical spectroscopy on three pointings in and near the SQ shock. We used Potsdam MultiAperture Spectrometer (PMAS) on the 3.5m Calar Alto telescope to obtain measures of emission lines that provide insight into physical properties of the gas. Severe blending of Hα and [NII]λ6548, 6583Å emission lines in many spaxels required the assumption of at least two kinematical components to extract fluxes for the individual lines. The main results from our study include (a) detection of discrete emission features in the new intruder velocity range 5400-6000km/s showing properties consistent with Hii regions, (b) detection of a low-velocity component spanning the range 5800-6300km/s with properties resembling a solar-metallicity shocked gas and (c) detection of a high-velocity component at ≃6600km/s with properties consistent with those of a low-metallicity shocked gas. The two shocked components are interpreted as products of a collision between NGC 7318b new intruder and a debris field in its path. This has given rise to a complex structure of ionized gas where several components with different kinematical and physical properties coexist, although part of the original interstellar medium (ISM) associated with NGC 7318b is still present and remains unaltered. Our observations suggest that the low-velocity ionized component might have existed before the new intruder collision and could be associated with the NW-LV Hi component. The high-velocity ionized component might fill the gap between the Hi complexes observed in SQ-A and NGC 7319's tidal filament (NW-HV, Arc-N and Arc-S in Williams et al., 2002AJ....123.2417W).

Abstract Copyright:

Journal keyword(s): galaxies: interactions - galaxies: ISM - galaxies: groups: individual: Stephan's Quintet

Simbad objects: 10

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Number of rows : 10

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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9694 1
2 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5702 4
3 BD+33 2642 pA* 15 51 59.8857490337 +32 56 54.327647794 9.806 10.61 10.73 10.884 10.961 O7p 385 0
4 Schulte 9 s*b 20 33 10.7366753544 +41 15 08.222187463 13.38 12.77 10.96     O4.5If 210 0
5 NGC 7317 Sy2 22 35 51.8681756144 +33 56 41.758762990 15.10 14.57 13.60 12.72   ~ 159 1
6 NGC 7318A GiP 22 35 56.85 +33 57 54.3   14.4   13.13   ~ 123 0
7 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 379 1
8 NGC 7318B GiP 22 35 58.3906020031 +33 57 57.832811083   14.06   12.47   ~ 125 0
9 NGC 7320 GiG 22 36 03.4063163618 +33 56 53.630500863 13.12 13.23 12.63 12.38   ~ 176 3
10 NGC 7319 Sy2 22 36 03.602 +33 58 33.18   14.57 13.53 12.65   ~ 256 0

    Equat.    Gal    SGal    Ecl

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2021.02.25-04:50:17

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