2008ApJ...679..156H


Query : 2008ApJ...679..156H

2008ApJ...679..156H - Astrophys. J., 679, 156-181 (2008/May-3)

Dissipation and extra light in galactic nuclei. I. Gas-rich merger remnants.

HOPKINS P.F., HERNQUIST L., COX T.J., DUTTA S.N. and ROTHBERG B.

Abstract (from CDS):

We study the origin and properties of ``extra'' or ``excess'' central light in the surface brightness profiles of remnants of gas-rich mergers. By combining a large set of hydrodynamical simulations with data on observed mergers that span a broad range of profiles at various masses and degrees of relaxation, we show how to robustly separate the physically meaningful extra light (i.e., the stellar population formed in a compact central starburst during a gas-rich merger) from the outer profile established by violent relaxation acting on stars already present in the progenitor galaxies prior to the final stages of the merger. This separation is sensitive to the treatment of the profile, and we demonstrate that certain fitting procedures can yield physically misleading results. We show that our method reliably recovers the younger starburst population, and examine how the properties and mass of this component scale with the mass, gas content, and other aspects of the progenitors. We consider the time evolution of the profiles in different bands, and estimate the biases introduced by observational studies at different phases and wavelengths. We show that, when appropriately quantified, extra light is ubiquitous in both observed and simulated gas-rich merger remnants, with sufficient mass (∼3%-30% of the stellar mass) to explain the apparent discrepancy in the maximum phase-space densities of ellipticals and their progenitor spirals. The nature of this central component provides a powerful new constraint on the formation histories of observed systems and can inform both our studies of their progenitors and our understanding of the global kinematics and structure of spheroids.

Abstract Copyright:

Journal keyword(s): Cosmology: Theory - Galaxies: Active - Galaxies: Evolution - Galaxies: Nuclei - Galaxies: Quasars: General

Simbad objects: 52

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Number of rows : 52
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Mrk 334 Sy1 00 03 09.6087980256 +21 57 36.971989884   15.30 14.62     ~ 195 0
2 NGC 34 Sy2 00 11 06.612 -12 06 28.33   14.14 13.52     ~ 334 0
3 IC 51 IG 00 46 24.215 -13 26 32.63   13.41   12.69 12.8 ~ 85 0
4 NGC 455 IG 01 15 57.6477696600 +05 10 43.224781008   13.9       ~ 41 0
5 Mrk 1014 Sy1 01 59 50.2534701768 +00 23 40.864244784   16.08 15.87     ~ 547 0
6 NGC 828 rG 02 10 09.5469097104 +39 11 25.233638244   13.0       ~ 154 1
7 UGC 2238 G 02 46 17.482 +13 05 44.33   15.2       ~ 118 1
8 NGC 1210 G 03 06 45.3516825024 -25 42 58.855024728   13.70   12.54   ~ 39 0
9 ESO 481-22 G 03 20 40.3202584128 -22 55 52.864743900   14.54   13.22   ~ 24 0
10 NGC 1614 AGN 04 34 00.027 -08 34 44.57   14.66 13.99     ~ 644 0
11 MCG-02-13-040a IG 05 04 53.042 -10 14 52.56   15   14.22   ~ 51 1
12 ESO 307-25 IG 06 13 47.6258341728 -37 40 36.600431556   14.76   12.95   ~ 24 0
13 NGC 2418 IG 07 36 37.4992142280 +17 53 01.870386972   13.7       ~ 60 0
14 Mrk 84 G 07 55 06.2084298888 +55 42 13.786862652   13.6       ~ 42 0
15 NGC 2623 LIN 08 38 24.016 +25 45 16.29 14.10 13.99 13.36     ~ 469 1
16 UGC 4635 LIN 08 51 54.8217436056 +40 50 09.219189192   15.2       ~ 26 0
17 NGC 2655 LIN 08 55 37.731 +78 13 23.10   12.03 11.08     ~ 277 1
18 NGC 2744 GiG 09 04 39.0017418744 +18 27 51.863760756   13.7       ~ 52 0
19 NGC 2782 Sy2 09 14 05.120 +40 06 49.68 12.29 12.30 11.63     ~ 448 3
20 NGC 2914 LIN 09 34 02.7855845040 +10 06 31.380212052   13.7       ~ 64 0
21 UGC 5101 Sy1 09 35 51.6045544584 +61 21 11.589382368   15.20 15.50     ~ 544 4
22 ESO 435-16 EmG 09 58 46.223 -28 37 18.86   13.43   12.25 13.0 ~ 44 2
23 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 807 2
24 NGC 3310 AGN 10 38 45.85707 +53 30 11.8940   12.45 12.15     ~ 758 1
25 UGC 5814 IG 10 42 38.1365126688 +77 29 41.422855524 16.95 16.58 14.77     ~ 40 0
26 NGC 3597 EmG 11 14 41.9796496464 -23 43 39.573399828   13.62   12.46   ~ 124 0
27 NGC 3656 GiP 11 23 38.6139450288 +53 50 31.100522064 14.50 14.25 12.75     ~ 133 1
28 NGC 3921 IG 11 51 06.8803989360 +55 04 43.414457484   13.4 12.64     ~ 241 0
29 NGC 4004 H2G 11 58 05.2253666472 +27 52 43.761225324   14.0       ~ 105 0
30 ESO 379-22 EmG 12 01 20.665 -33 52 35.26   14.08 14.46 12.94   ~ 33 0
31 NGC 4194 AGN 12 14 09.615 +54 31 35.93   13.79 13.30     ~ 436 2
32 NGC 4441 GiG 12 27 20.402 +64 48 05.64   13.5       ~ 75 0
33 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1914 3
34 ESO 269-20 GiG 12 58 08.042 -43 19 47.17   14.53   13.29   ~ 21 0
35 ESO 507-70 SyG 13 02 52.3177169808 -23 55 17.932558692   14.77 14.78 13.24   ~ 111 0
36 NGC 5018 GiP 13 13 01.0452720960 -19 31 05.649751992   11.71   10.31   ~ 293 1
37 IC 883 SBG 13 20 35.380 +34 08 21.84   14.8       ~ 387 1
38 ESO 511-35 IG 14 22 06.6122328120 -26 51 26.716546872   14.24   12.70   ~ 22 0
39 UGC 9829 GiG 15 23 01.5777215256 -01 20 49.837650972   15.3       ~ 36 0
40 NGC 6052 IG 16 05 12.8715178104 +20 32 32.607297132 13.01 13.44 13.00     ~ 341 2
41 IC 4630 IG 16 55 09.5799007728 +26 39 46.541919240   14.8       ~ 48 0
42 Mrk 700 LIN 17 03 15.7160341128 +31 27 28.555153092   14.73 14.04     ~ 81 0
43 NGC 6598 G 18 08 56.0229611160 +69 04 04.677239388   14.2       ~ 18 0
44 ESO 341-4 IG 20 41 13.872 -38 11 36.38   13.40 12.75 12.35   ~ 44 0
45 ESO 286-19 LIN 20 58 26.8183783008 -42 38 59.411838156   14.79 14.79 14.20   ~ 271 0
46 NGC 7135 AGN 21 49 46.0013389728 -34 52 34.575955536   12.25 13.30 10.84   ~ 87 0
47 UGC 11905 G 22 05 54.580 +20 38 21.48   15.10       ~ 41 0
48 NGC 7252 IG 22 20 44.7748209648 -24 40 41.909518200 12.26 12.46 12.06 11.57   ~ 686 1
49 ESO 239-2 G 22 49 39.8505632256 -48 50 58.076200284   14.46       ~ 66 0
50 IC 5298 Sy2 23 16 00.6756811155 +25 33 24.081139422   15.0       ~ 185 0
51 NGC 7585 IG 23 18 01.348 -04 39 01.07   12.46 18.7 11.23   ~ 102 0
52 NGC 7727 GiP 23 39 53.870 -12 17 34.84   11   10.55   ~ 166 0

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2022.09.28-01:45:13

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