2017MNRAS.469..347S

Query : 2017MNRAS.469..347S

2017MNRAS.469..347S - Mon. Not. R. Astron. Soc., 469, 347-382 (2017/July-3)

EIG - II. Intriguing characteristics of the most extremely isolated galaxies.

SPECTOR O. and BROSCH N.

Abstract (from CDS):

We have selected a sample of 41 extremely isolated galaxies (EIGs) from the local Universe using both optical and H I Arecibo Legacy Fast ALFA survey redshifts. Narrow-band H α and wide-band imaging along with public data were used to derive star formation rates (SFRs), star formation histories and morphological classifications for the EIGs. We have found that the extreme isolation of the EIGs does not affect considerably their star formation compared to field galaxies. EIGs are typically 'blue cloud' galaxies that fit the 'main sequence of star-forming galaxies' and may show asymmetric star formation and strong compact star-forming regions. We discovered surprising environmental dependences of the H I content, M_ H  I_, and of the morphological type of EIGs; the most isolated galaxies (of subsample EIG-1) have lower M_ H  I_ on average (with 2.5σ confidence) and a higher tendency to be early types (with 0.94 confidence) compared to the less isolated galaxies of subsample EIG-2. To the best of our knowledge, this is the first study that finds an effect in which an isolated sample shows a higher fraction of early types compared to a less isolated sample. Both early-type and late-type EIGs follow the same colour-to-M*, SFR-to-M* (main sequence) and M_ H  I–to–M*_ relations. This indicates that the mechanisms and factors governing star formation, colour and the M_ H  I–to–M*_ relation are similar in early-type and late-type EIGs, and that the morphological type of EIGs is not governed by their M_ H  I_ content, colour or SFR.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): surveys - galaxies: evolution - galaxies: haloes - galaxies: star formation - galaxies: structure - galaxies: structure

VizieR on-line data: <Available at CDS (J/MNRAS/469/347): sources.dat table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat table8.dat table11.dat table12.dat>

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LEDA 1722063 AG? 00 27 07.594 +24 59 07.21           ~ 10 0
2 LEDA 1704634 G 00 56 29.1633776040 +24 19 13.032794496           ~ 3 0
3 LEDA 1704510 AG? 00 56 37.721 +24 18 52.62           ~ 9 0
4 Z 480-41 G 01 06 11.978 +25 33 06.40   15.5       ~ 29 0
5 LEDA 1768882 G 01 33 15.601 +26 14 55.61           ~ 13 0
6 SDSS J023136.90+263234.6 AG? 02 31 36.901 +26 32 34.65           ~ 11 0
7 IC 238 AG? 02 35 22.6770525984 +12 50 15.922453920   14.1       ~ 29 0
8 LEDA 213033 G 02 35 30.1 +12 49 58           ~ 4 0
9 LEDA 90644 AG? 02 56 08.633 +27 42 01.84           ~ 21 0
10 LEDA 4082141 AG? 07 50 41.985 +14 47 17.38           ~ 8 0
11 LEDA 4148686 AG? 07 55 32.172 +11 33 16.69           ~ 4 0
12 LEDA 1416977 AG? 08 06 16.1683212264 +12 49 40.607349672           ~ 12 0
13 LEDA 87292 LSB 08 24 51.737 +09 13 29.81   16.36       ~ 15 0
14 Z 33-16 EmG 08 53 32.699 +04 46 57.90   15.6       ~ 40 0
15 LEDA 4010100 AG? 09 21 31.909 +11 20 48.27           ~ 13 0
16 AGC 208312 G 10 20 39.6 +08 09 06           ~ 5 0
17 LEDA 3999311 AG? 10 23 52.853 +06 24 17.01           ~ 10 0
18 NAME Great Attractor SCG 10 32 -46.0           ~ 617 0
19 LEDA 4015631 AG? 10 40 08.810 +09 16 28.54           ~ 11 0
20 LEDA 1278497 AG? 11 04 14.590 +05 07 36.65           ~ 12 0
21 SDSS J111624.12+054352.7 AG? 11 16 24.1353548448 +05 43 53.229304668           ~ 3 0
22 SDSS J112156.76+102955.4 AG? 11 21 56.7697635528 +10 29 55.035013200           ~ 11 0
23 SDSS J112157.63+102959.6 G 11 21 57.633 +10 29 59.65           ~ 2 0
24 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
25 LEDA 4002681 AG? 12 38 14.436 +10 09 49.81           ~ 9 0
26 SDSS J124011.52+154213.8 AG? 12 40 11.52221 +15 42 13.8632           ~ 9 0
27 LEDA 42597 GiC 12 41 45.361 +11 15 02.25   17     15.1 ~ 26 0
28 SDSS J124548.06+092029.0 AG? 12 45 48.050 +09 20 29.11           ~ 9 0
29 Z 43-46 EmG 12 51 33.545 +08 02 43.17   15.5       ~ 20 0
30 SDSS J125830.50+121123.2 AG? 12 58 30.500 +12 11 23.27           ~ 7 0
31 NAME Shapley Supercluster SCG 13 06.0 -33 04           ~ 677 0
32 SDSS J133156.93+133101.6 AG? 13 31 56.9398411032 +13 31 01.625113416           ~ 4 0
33 Z 47-124 AG? 14 38 46.810 +07 37 02.80   15.7       ~ 18 0
34 Z 76-69 GiG 14 49 33.818 +13 48 25.00   15.4       ~ 18 0
35 LEDA 4550334 AG? 15 05 44.499 +11 12 30.14           ~ 7 0
36 LEDA 5057632 GiC 15 10 54.6038803608 +05 43 14.870102556           ~ 15 0
37 LEDA 4573317 AG? 15 14 10.954 +06 44 49.10           ~ 8 0
38 Z 50-28 AG? 15 34 46.244 +06 17 49.38   15.3       ~ 13 0
39 LEDA 4477270 AG? 15 46 27.1010598240 +08 39 24.719505768           ~ 7 0
40 Z 50-112 AG? 15 50 25.52 +04 28 35.3   15.4       ~ 10 0
41 UCM 1612+1308 EmG 16 15 17.02165 +13 01 33.0873   18.05       ~ 22 0
42 AGC 321304 AG? 22 03 51.10 +25 26 32.0           ~ 7 0
43 Z 474-14 AG? 22 37 53.430 +25 11 36.60   15.6       ~ 37 0
44 LEDA 69532 G 22 42 07.3370232000 +27 46 11.264636028   16       ~ 12 0
45 LEDA 5057381 AG? 22 55 44.676 +26 18 09.39           ~ 9 0

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