2012A&A...543A.112A

Query : 2012A&A...543A.112A

2012A&A...543A.112A - Astronomy and Astrophysics, volume 543A, 112-112 (2012/7-1)

Stripped gas as fuel for newly formed HII regions in the encounter between VCC 1249 and M49: a unified picture from NGVS and GUViCS.

ARRIGONI BATTAIA F., GAVAZZI G., FUMAGALLI M., BOSELLI A., BOISSIER S., CORTESE L., HEINIS S., FERRARESE L., COTE P., MIHOS J.C., CUILLANDRE J.C., DUC P.-A., DURRELL P., GWYN S., JORDAN A., LIU C., PENG E. and MEI S.

Abstract (from CDS):

We study the peculiar interacting galaxy system of VCC1249/M49 located in the core of the Virgo B subcluster. Owing to a recent interaction between the dwarf galaxy VCC1249 and the halo gas of the elliptical galaxy M49, neutral hydrogen has been displaced from the interstellar medium of this dwarf into the Virgo intracluster medium. Observations also reveal multiple compact star-forming regions (aka HII regions) that are embedded in this HI cloud, with a projected separation up to 13kpc from VCC1249 in the northwest direction. Motivated by recent near-ultraviolet imaging from the GALEX Ultraviolet Virgo Cluster Survey (GUViCS) of the VCC1249/M49 system that shows significant ongoing/recent star formation in the compact regions, we aim to constrain the origin of these outlying HII regions with a multi-wavelength approach. Using deep optical (u, g, i, z) imaging from the Next Generation Virgo Cluster Survey (NGVS) and new Hα imaging obtained at the San Pedro Martir observatory together with Keck long-slit spectroscopy, we characterize the star formation rates, ages, and metallicity of VCC1249 and its outlying compact regions. Moreover, we analyze the color and luminosity profile of the galaxy to investigate its recent interaction with M49. Our new observations indicate that VCC1249 underwent a recent interaction with M49 in which both ram-pressure stripping and tidal interaction occured. The joint action of the two mechanisms led to the removal of the HI gas from the interstellar medium of VCC1249, while the gravitational tides triggered the stellar tail and counter-tail of VCC1249. Our stellar population synthesis analysis reveals that the star formation in this galaxy was truncated around 200Myr ago and that the outlying HII regions were born in situ ≃10Myr ago out of pre-enriched gas removed from the dwarf galaxy. These observations also reveal that interactions between central and satellite galaxies similar to those between VCC1249/M49 may be an effective way of dispersing metals into the halos of massive galaxies.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Virgo - galaxies: evolution - galaxies: irregular - galaxies: abundances

CDS comments: Table 2 objects [LKG97b] CNN are not in Simbad ; figure 5 are stars not in Simbad.

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 - 2024 		#notes
1 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2154 2
2 Feige 34 HS* 10 39 36.7358839104 +43 06 09.212615280 9.613 10.91 11.14 11.319 11.464 sdOp 679 0
3 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 918 2
4 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1084 1
5 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6643 0
6 NGC 4435 GiG 12 27 40.503 +13 04 44.48 12.23 11.74 10.80     ~ 445 2
7 NGC 4438 LIN 12 27 45.6705493536 +13 00 31.708096380 11.37 11.02 10.17     ~ 636 2
8 NGC 4467 GiG 12 29 30.2447376768 +07 59 34.273371336   15.2       ~ 179 0
9 LEDA 41180 AG? 12 29 34.9891966080 +08 03 28.781563608           ~ 84 0
10 NGC 4470 H2G 12 29 37.8066943368 +07 49 27.284422224   12.9       ~ 239 0
11 SDSS J122942.96+104525.0 Sy2 12 29 42.9615849624 +10 45 24.913701540           ~ 88 0
12 IC 3418 LIN 12 29 43.919 +11 24 16.87   16.5       ~ 118 1
13 NAME Vir B Cluster GrG 12 29.8 +08 00           ~ 132 0
14 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2093 2
15 [LKG97b] C2 HII 12 29 56 +07 57.6           ~ 3 0
16 UGC 7636 LSB 12 30 00.350 +07 55 47.44   15.4       ~ 134 0
17 NAME Virgo A Cluster ClG 12 30 49.2 +12 23 30           ~ 140 0
18 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7193 3
19 M 89 LIN 12 35 39.80733343 +12 33 22.8308657 11.29 10.73 9.75     ~ 995 2
20 NGC 4654 GiP 12 43 56.638 +13 07 34.86   11.8       ~ 567 1
21 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1125 0
22 HZ 44 HS* 13 23 35.2629445608 +36 07 59.544140304 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 417 0
23 ACO 2667 ClG 23 51 39.37 -26 05 02.7           ~ 174 0

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