Results 61 to 70 of about 327,275 (314)

Galaxy mergers moulding the circum-galactic medium – I. The impact of a major merger [PDF]

, 2018
Galaxies are surrounded by sizeable gas reservoirs which host a significant amount of metals: the circum-galactic medium (CGM). The CGM acts as a mediator between the galaxy and the extra-galactic medium. However, our understanding of how galaxy mergers,
M. Hani, M. Sparre, S. Ellison, P. Torrey, M. Vogelsberger   +4 more
semanticscholar   +1 more source

Merger-induced metallicity dilution in cosmological galaxy formation simulations [PDF]

Monthly notices of the Royal Astronomical Society, 2017
Observational studies have revealed that galaxy pairs tend to have lower gas-phase metallicity than isolated galaxies. This metallicity deficiency can be caused by inflows of low-metallicity gas due to the tidal forces and gravitational torques ...
S. Bustamante, M. Sparre, V. Springel, R. Grand   +3 more
semanticscholar   +1 more source

The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. VII. Properties of the Host Galaxy and Constraints on the Merger Timescale [PDF]

, 2017
We present the properties of NGC 4993, the host galaxy of GW170817, the first gravitational-wave (GW) event from the merger of a binary neutron star (BNS) system and the first with an electromagnetic (EM) counterpart.
P. Blanchard, E. Berger, W. Fong, M. Nicholl, J. Leja, C. Conroy, K. Alexander, R. Margutti, P. G. Williams, Zoheyr Doctor, R. Chornock, V. Villar, P. Cowperthwaite, J. Annis, D. Brout, D. Brown, H.-Y. Chen, T. Eftekhari, J. Frieman, D. Holz, B. Metzger, A. Rest, M. Sako, M. Soares-Santos   +23 more
semanticscholar   +1 more source

THE EXCEPTIONAL SOFT X-RAY HALO OF THE GALAXY MERGER NGC 6240 [PDF]

, 2013
We report on a recent ∼150 ks long Chandra observation of the ultraluminous infrared galaxy merger NGC 6240, which allows a detailed investigation of the diffuse galactic halo.
E. Nardini, Junfeng Wang, G. Fabbiano, M. Elvis, S. Pellegrini, G. Risaliti, M. Karovska, A. Zezas   +7 more
semanticscholar   +1 more source

The Role Of Mergers In Galaxy Formation

, 2017
The combination of high spatial resolution from space and 3D spectroscopy from ground is a remarkable tool to dissect distant galaxies and their internal motions. Combining HST and VLT instruments, it has robustly captured the evolution of the Hubble Sequence since the last 8 billion years.
Hammer, Francois, Rodrigues, Myriam, Flores, Hector, Puech, Mathieu, Yang, Yanbin, Sauvaget, Tabatha   +5 more
openaire   +2 more sources

Triggered Starbursts in Galaxy Mergers [PDF]

Symposium - International Astronomical Union, 1999
A unified formation mechanism of nuclear starbursts is presented; all the nuclear starbursts are triggered by binary supermassive black holes made in the final phase of galaxy mergers. Minor mergers cause both nuclear starbursts and hot-spot nuclei while major mergers cause (ultra) luminous infrared galaxies. We discuss the case of Arp 220 in detail.
K. Wada, Yoshiaki Taniguchi, Yasuhiro Shioya, Takashi Murayama   +3 more
openaire   +2 more sources

Merger rates in hierarchical models of galaxy formation – II. Comparison with N-body simulations [PDF]

, 1994
We have made a detailed comparison of the results of N-body simulations with the analytical description of the merging histories of dark matter haloes presented in Lacey & Cole, which is based on an extension of the Press-Schechter method.
C. Lacey, S. Cole
semanticscholar   +1 more source

Deep learning for galaxy mergers in the galaxy main sequence [PDF]

Proceedings of the International Astronomical Union, 2019
AbstractStarburst galaxies are often found to be the result of galaxy mergers. As a result, galaxy mergers are often believed to lie above the galaxy main sequence: the tight correlation between stellar mass and star formation rate. Here, we aim to test this claim.Deep learning techniques are applied to images from the Sloan Digital Sky Survey to ...
Floris van der Tak, Floris van der Tak, W. J. Pearson, W. J. Pearson, James W. Trayford, C. E. Petrillo, Lingyu Wang, Lingyu Wang   +7 more
openaire   +5 more sources

Could M31 be the result of a major merger?

EPJ Web of Conferences, 2012
We investigated a scenario in which M31 could be the remnant of a gas-rich major merger. Galaxy merger simulations, highly constrained by observations, were run using GADGET 2 in order to reproduce M31. We succeeded in reproducing the global shape of M31,
Puech M., Yang Y.-B., Wang J., Hammer F., Fouquet S., Flores H.   +5 more
doaj   +1 more source

Weak-lensing Mass Bias in Merging Galaxy Clusters

The Astrophysical Journal, 2023
Although weak lensing (WL) is a powerful method to estimate a galaxy cluster mass without any dynamical assumptions, a model bias can arise when the cluster density profile departs from the assumed model profile. In a merging system, the bias is expected
Wonki Lee, Sangjun Cha, M. James Jee, Daisuke Nagai, Lindsay King, John ZuHone, Urmila Chadayammuri, Sharon Felix, Kyle Finner   +8 more
doaj   +1 more source