2018MNRAS.476.1010A

Query : 2018MNRAS.476.1010A

2018MNRAS.476.1010A - Mon. Not. R. Astron. Soc., 476, 1010-1020 (2018/May-1)

UV SEDs of early-type cluster galaxies: a new look at the UV upturn.

ALI S.S., BREMER M.N., PHILLIPPS S. and DE PROPRIS R.

Abstract (from CDS):

Using GALEX, Ultraviolet Optical Telescope (UVOT), and optical photometry, we explore the prevalence and strength of the Ultraviolet (UV) upturn in the spectra of quiescent early-type galaxies in several nearby clusters. Even for galaxies with completely passive optical colours, there is a large spread in vacuum UV colour consistent with almost all having some UV upturn component. Combining GALEX and UVOT data below 3000 Å, we generate for the first time comparatively detailed UV spectral energy distributions for Coma cluster galaxies. Fitting the UV upturn component with a blackbody, 26 of these show a range of characteristic temperatures (10 000-21 000K) for the UV upturn population. Assuming a single temperature to explain GALEX-optical colours could underestimate the fraction of galaxies with UV upturns and mis-classify some as systems with residual star formation. The UV upturn phenomenon is not an exclusive feature found only in giant galaxies; we identify galaxies with similar (or even bluer) FUV - V colours to the giants with upturns over a range of fainter luminosities. The temperature and strength of the UV upturn are correlated with galaxy mass. Under the plausible hypothesis that the sources of the UV upturn are blue horizontal branch stars, the most likely mechanism for this is the presence of a substantial (between 4 per cent and 20 per cent) Helium-rich (Y > 0.3) population of stars in these galaxies, potentially formed at z ∼ 4 and certainly at z > 2; this plausibly sets a lower limit of ∼0.3 - 0.8 ×1010 M☉ to the in situ stellar mass of ∼L* galaxies at this redshift.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: horizontal branch - galaxies: clusters: individual: Coma - galaxies: evolution - galaxies: formation

Simbad objects: 42

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Number of rows : 42
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3917 0
2 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2154 2
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12651 1
4 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2259 1
5 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 1827 0
6 Cl Berkeley 17 OpC 05 20 31.2 +30 34 26           ~ 174 0
7 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1420 0
8 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6648 0
9 NGC 4867 GiG 12 59 15.2505719952 +27 58 14.616353712 15.60 15.5 14.14 13.969 13.213 ~ 126 0
10 2MASX J12592016+2753098 GiC 12 59 20.1719431200 +27 53 09.554536464 16.59 16.657 15.34 15.24 14.591 ~ 84 0
11 2MASX J12592265+2753488 GiC 12 59 22.6199737728 +27 53 48.734841408 16.66 16.504 15.33 14.972 14.39 ~ 66 0
12 NGC 4869 rG 12 59 23.3588349024 +27 54 41.731884360 15.03 14.9 13.52 13.292 12.536 ~ 278 0
13 2MASX J12592529+2758048 GiC 12 59 25.3302921888 +27 58 04.567089792 16.97 17.055 15.59 15.541 14.863 ~ 64 0
14 IC 3968 EmG 12 59 25.4893671192 +27 58 23.553468660 16.70 16.795 15.32 15.271 14.593 ~ 62 0
15 LEDA 44594 EmG 12 59 26.5981818744 +27 59 54.533097708 17.532 17.181 16.264 15.711 15.052 ~ 74 0
16 IC 3976 G 12 59 29.4017977320 +27 51 00.507145788 15.93 15.5 14.42 14.212 13.495 ~ 103 0
17 NGC 4871 AGN 12 59 29.9631023208 +27 57 23.169658968 15.59 15.1 14.07 13.801 13.113 ~ 116 0
18 IC 3973 AG? 12 59 30.8230953864 +27 53 03.142254372 15.50 15.2 14.03 13.802 13.114 ~ 108 0
19 NGC 4873 EmG 12 59 32.7956813376 +27 59 01.023698256 15.53 15.4 14.13 13.941 13.224 ~ 121 0
20 NGC 4872 AGN 12 59 34.1212116072 +27 56 48.678716616 15.58 14.7 14.10 14.092 13.423 ~ 139 0
21 NGC 4874 LIN 12 59 35.7093764280 +27 57 33.293892204 13.01 13.7 11.40 12.122 11.386 ~ 783 3
22 NGC 4875 GiC 12 59 37.9093929384 +27 54 26.400242232 16.03 15.92 14.57 14.322 13.605 ~ 96 0
23 LEDA 44636 G 12 59 38.3213456016 +27 59 13.953200280 17.19 17.13 15.88 15.651 15.002 ~ 64 0
24 LEDA 44644 G 12 59 39.6590757624 +27 57 14.115321252 16.97 16.99 15.59 15.41 14.99 ~ 73 0
25 LEDA 44651 EmG 12 59 40.2735433608 +27 58 05.677395348 17.47 17.375 16.02 15.812 15.153 ~ 61 0
26 Z 160-233 G 12 59 42.3031814928 +27 55 29.073263772 17.64 16.553 15.42 15.051 14.373 ~ 98 0
27 LEDA 44656 G 12 59 43.7289109656 +27 59 40.858551456 16.53 16.384 15.15 14.832 14.154 ~ 93 0
28 LEDA 44652 G 12 59 44.2059500952 +27 57 30.335521572 16.94 16.982 15.70 15.52 14.881 ~ 60 0
29 NGC 4876 LIN 12 59 44.4043327032 +27 54 44.883805032 15.61 15.1 14.18 13.992 13.333 ~ 149 0
30 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4805 2
31 2MASX J12594610+2751257 GiC 12 59 46.1220417624 +27 51 26.046219456 16.37 16.258 15.00 14.701 13.994 ~ 63 0
32 IC 3998 G 12 59 46.7810952336 +27 58 25.887811872 16.07 15.909 14.61 14.341 13.605 ~ 94 0
33 NGC 4883 GiG 12 59 56.0172515304 +28 02 04.976091780 15.76 15.2 14.27 13.872 13.165 ~ 106 0
34 2MASX J12595670+2755483 GiC 12 59 56.6529405408 +27 55 48.133297416 16.72 16.765 15.42 15.231 14.592 ~ 67 0
35 NGC 4889 EmG 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 707 1
36 SN 2015M SN* 13 00 32.30 +27 58 41.1           SNIapec 12 1
37 IC 4040 rG 13 00 37.861 +28 03 28.68 15.13 15.1 14.76 14.708 13.981 ~ 163 0
38 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1125 0
39 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3427 0
40 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 914 1
41 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 884 0
42 NGC 6791 OpC 19 20 53.0 +37 46 41   10.52 9.5     ~ 1040 0

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