2014A&A...569A..97U


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST04:29:49

2014A&A...569A..97U - Astronomy and Astrophysics, volume 569A, 97-97 (2014/9-1)

A census of Hα emitters in the intergalactic medium of the NGC 2865 system.

URRUTIA-VISCARRA F., ARNABOLDI M., MENDES DE OLIVEIRA C., GERHARD O., TORRES-FLORES S., CARRASCO E.R. and DE MELLO D.

Abstract (from CDS):

Tidal debris, which are rich in HI gas and formed in interacting and merging systems, are suitable laboratories to study star formation outside galaxies. Recently, several such systems were observed, which contained many young star forming regions outside the galaxies. In previous works, we have studied young star forming regions outside galaxies in different systems with optical and/or gaseous tidal debris, in order to understand how often they occur and in which type of environments. In this paper, we searched for star forming regions around the galaxy NGC 2865, a shell galaxy that is circled by a ring of HI with a total mass of 1.2x109M. Using the multi-slit imaging spectroscopy technique with the Gemini telescope, we detected all Hα emitting sources in the surroundings of the galaxy NGC 2865, down to a flux limit of 10–18erg/cm2/s/Å. With the spectra information and the near and far-ultraviolet flux, we characterize the star formation rates, masses, ages, and metallicities for these HII regions. In total, we found 26 emission-line sources in a 60x60 Kpc field centered over the southeastern tail of the HI gas present around the galaxy NGC 2865. Out of the 26 Hα emitters, 19 are in the satellite galaxy FGCE 0745, and seven are intergalactic HII regions scattered over the south tail of the HI gas around NGC 2865. We found that the intergalactic HII regions are young (<200Myr) with stellar masses in the range 4x103 M to 17x106 M. These are found in a region of low HI gas density, where the probability of forming stars is expected to be low. For one of the intergalactic HII regions, we estimated a solar oxygen abundance of 12+log(O/H)∼8.7. We also were able to estimate the metallicity for the satellite galaxy FGCE 0745 to be 12+log(O/H)∼8.0. Given these physical parameters, the intergalactic HII regions are consistent with young star forming regions (or clusters), which are born in situ outside the NGC 2865 galaxy from a pre-enriched gas removed from the host galaxies in a merger event. The relevance of these observations is discussed.

Abstract Copyright:

Journal keyword(s): ISM: abundances - HII regions - galaxies: individual: NGC 2865 - galaxies: dwarf - galaxies: ISM - galaxies: star formation

Nomenclature: Table 3: [UAM2014] IG NN PN N=9, Table 4: [UAM2014] Sat NN PN, [UAM2014] Sat NN.N PN N=19.

Simbad objects: 50

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Number of rows : 50

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 HCG 100 CGG 00 01 19.783 +13 07 21.81           ~ 55 0
2 NGC 92 GiC 00 21 31.713 -48 37 29.23   13.71   12.40   ~ 39 0
3 HCG 16 CGG 02 09 40.82 -10 11 02.0           ~ 157 0
4 NGC 1533 GiG 04 09 51.8352578260 -56 07 06.404418566   11.77 10.92 10.27 11.0 ~ 178 0
5 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1751 1
6 NGC 2782 Sy2 09 14 05.120 +40 06 49.68 12.29 12.30 11.63     ~ 435 3
7 [M98c] 092035.0-225654 G 09 22 50.6 -23 09 47           ~ 2 0
8 NGC 2865 GiG 09 23 30.205 -23 09 41.37   12.39 11.43 11.06   ~ 226 0
9 [UAM2014] IG 23 P8 HII 09 23 30.50 -23 11 36.4           ~ 1 0
10 [UAM2014] IG 17 P1 HII 09 23 30.90 -23 11 05.6           ~ 1 0
11 [UAM2014] IG 4 P4 HII 09 23 36.30 -23 09 15.8           ~ 1 0
12 [UAM2014] IG 4 P3 HII 09 23 36.30 -23 09 15.8           ~ 1 0
13 [UAM2014] IG 4 P0 HII 09 23 36.30 -23 09 15.8           ~ 1 0
14 [UAM2014] IG 51 P3 HII 09 23 36.60 -23 11 38.2           ~ 1 0
15 [UAM2014] IG 52 P7 HII 09 23 40.20 -23 12 12.7           ~ 1 0
16 [UAM2014] Sat 99 P7 EmG 09 23 40.50 -23 14 54.6           ~ 1 0
17 [UAM2014] Sat 99 P6 EmG 09 23 40.70 -23 14 56.9           ~ 1 0
18 [UAM2014] Sat 98 P1 EmG 09 23 40.70 -23 14 52.6           ~ 1 0
19 LEDA 92253 G 09 23 40.8 -23 14 46           ~ 11 0
20 [UAM2014] Sat 98 P4 EmG 09 23 41.00 -23 14 51.0           ~ 1 0
21 [UAM2014] IG 85 P6 HII 09 23 41.10 -23 12 20.8           ~ 1 0
22 [UAM2014] Sat 97.2 P2 EmG 09 23 41.30 -23 14 45.4           ~ 1 0
23 [UAM2014] Sat 97 P0 EmG 09 23 41.60 -23 14 49.6           ~ 1 0
24 [UAM2014] Sat 97 P1 EmG 09 23 41.60 -23 14 49.0           ~ 1 0
25 [UAM2014] Sat 98 P8 EmG 09 23 41.70 -23 14 52.1           ~ 1 0
26 [UAM2014] Sat 97.2 P4 EmG 09 23 41.70 -23 14 45.9           ~ 1 0
27 [UAM2014] Sat 97.1 P2 EmG 09 23 41.80 -23 14 48.8           ~ 1 0
28 [UAM2014] Sat 97 P3 EmG 09 23 41.90 -23 14 48.5           ~ 1 0
29 [UAM2014] Sat 97.1 P4 EmG 09 23 42.00 -23 14 48.3           ~ 1 0
30 [UAM2014] Sat 97 P5 EmG 09 23 42.00 -23 14 47.7           ~ 1 0
31 [UAM2014] Sat 97 P6 EmG 09 23 42.10 -23 14 47.1           ~ 1 0
32 [UAM2014] Sat 97 P7 EmG 09 23 42.40 -23 14 47.9           ~ 1 0
33 [UAM2014] Sat 97 P8 EmG 09 23 42.40 -23 14 47.2           ~ 1 0
34 [UAM2014] Sat 96 P1 EmG 09 23 42.70 -23 14 46.6           ~ 1 0
35 [UAM2014] Sat 96 P2 EmG 09 23 42.70 -23 14 46.0           ~ 1 0
36 [UAM2014] Sat 96 P3 EmG 09 23 42.70 -23 14 44.7           ~ 1 0
37 [UAM2014] IG 87 P0 HII 09 23 43.90 -23 13 08.9           ~ 1 0
38 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 791 3
39 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1385 0
40 NGC 3384 GiG 10 48 16.897 +12 37 45.48   10.0       ~ 555 1
41 NGC 4262 GiG 12 19 30.582 +14 52 39.78 13.00 12.49 11.55     ~ 332 1
42 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1198 2
43 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1019 1
44 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5908 0
45 NGC 4438 LIN 12 27 45.652 +13 00 30.92 11.37 11.02 10.17     ~ 583 3
46 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1971 2
47 UGC 7636 LSB 12 30 00.350 +07 55 47.44   15.4       ~ 120 0
48 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 377 1
49 LP 877-23 PM* 22 52 41.0353308036 -20 35 32.995847106   13.02 11.90     ~ 104 0
50 NAME Leo Ring HI ~ ~           ~ 43 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-04:29:49

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