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A radio continuum view of Stephan's Quintet: age, dynamics and origin of the shock
K. Rajpurohit, E. O'Sullivan, G. Schellenberger +10
We present a detailed, multi-band radio continuum study of the compact galaxy group Stephan's Quintet (HCG 92). We use a combination of new (MeerKAT, uGMRT) and archival (LOFAR, VL…
HI Gas and Star Formation in Major Galaxy Pairs from the FAST All-Sky HI Survey (FASHI)
Shulan Yan, Qingzheng Yu, Taotao Fang +6
Atomic hydrogen (HI) plays a fundamental role in fueling star formation in galaxies. However, the behavior of HI gas in interacting systems, particularly galaxy pairs, remains elus…
Multi-phase gas interactions on subarcsec scales in the shocked IGM of Stephan's Quintet with JWST and ALMA
P. N. Appleton, P. Guillard, B. Emonts +12
We combine JWST and HST imaging with ALMA~CO(2-1) spectroscopy to study the highly turbulent multi-phase intergalactic medium (IGM) in Stephan's Quintet on 25-150 pc scales. Previo…
A 0.6 Mpc HI Structure Associated with Stephan's Quintet
C. K. Xu, C. Cheng, P. N. Appleton +8
Stephan's Quintet (SQ, distance=856 Mpc) is unique among compact groups of galaxies. Observations have previously shown that interactions between multiple members, including a…
Extremely broad Lyman-alpha line emission from the molecular intra-group medium in Stephan's Quintet: evidence for a turbulent cascade in a highly clumpy multi-phase medium?
P. Guillard, P. N Appleton, F. Boulanger +8
We present Hubble Space Telescope Cosmic Origin Spectrograph (COS) UV line spectroscopy and integral-field unit (IFU) observations of the intra-group medium in Stephan's Quintet (S…
Herschel Spectroscopy of the Taffy Galaxies (UGC 12914/12915 = VV 254): Enhanced [C II] emission in the collisionally-formed bridge
B. W. Peterson, P. N. Appleton, T. Bitsakis +17
Using the PACS and SPIRE spectrometers on-board Herschel, we obtained observations of the Taffy galaxies (UGC 12914/12915) and bridge. The Taffy system is believed to be the result…
VALES: IV. Exploring the transition of star formation efficiencies between normal and starburst galaxies using APEX/SEPIA Band-5 and ALMA at low redshift
C. Cheng, E. Ibar, T. M. Hughes +12
In this work we present new APEX/SEPIA Band-5 observations targeting the CO () emission line of 24 Herschel-detected galaxies at . Combining this sample {w…
Powerful H2 Line Cooling in Stephan's Quintet II. Group-wide Gas and Shock Modeling of the Warm H2 and a Comparison with [CII]157.7um Emission and Kinematics
P. N. Appleton, P. Guillard, A. Togi +7
We map for the first time the two-dimensional H_2 excitation of warm intergalactic gas in Stephan's Quintet on group-wide (50 x 35 kpc^2) scales to quantify the temperature, mass a…
Deep ALMA imaging of the merger NGC1614 - Is CO tracing a massive inflow of non-starforming gas?
S. König, S. Aalto, S. Muller +4
Observations of the molecular gas over scales of 0.5 to several kpc provide crucial information on how gas moves through galaxies, especially in mergers and interacting systems, wh…
The HerMES sub-millimetre local and low-redshift luminosity functions
L. Marchetti, M. Vaccari, A. Franceschini +44
We used wide area surveys over 39 deg by the HerMES collaboration, performed with the Herschel Observatory SPIRE multi-wavelength camera, to estimate the low-redshift, $0.02<z<…
ALMA Observations of Warm Dense Gas in NGC 1614 --- Breaking of Star Formation Law in the Central kpc
C. K. Xu, C. Cao, N. Lu +20
We present ALMA Cycle-0 observations of the CO (6-5) line emission and of the 435um dust continuum emission in the central kpc of NGC 1614, a local luminous infrared galaxy (LIRG)…
Strong Far-IR Cooling Lines, Peculiar CO Kinematics and Possible Star Formation Suppression in Hickson Compact Group 57
K. Alatalo, P. N. Appleton, U. Lisenfeld +14
We present [C II] and [O I] observations from Herschel and CO(1-0) maps from the Combined Array for† Research in Millimeter Astronomy (CARMA) of the Hickson Compact Group HCG 57, f…
The role of massive halos in the Star Formation History of the Universe
P. Popesso, A. Biviano, A. Finoguenov +21
The most striking feature of the Cosmic Star Formation History (CSFH) of the Universe is a dramatic drop of the star formation (SF) activity, since z~1. In this work we investigate…
The evolution of galaxy star formation activity in massive halos
P. Popesso, A. Biviano, A. Finoguenov +20
There is now a large consensus that the current epoch of the Cosmic Star Formation History (CSFH) is dominated by low mass galaxies while the most active phase at 1<z<2 is dominate…
Extended [CII] Emission in Local Luminous Infrared Galaxies
T. Diaz-Santos, L. Armus, V. Charmandaris +20
We present Herschel/PACS observations of extended [CII]157.7μm line emission detected on ~ 1 - 10 kpc scales in 60 local luminous infrared galaxies (LIRGs) from the Great Observato…
Warm Molecular Gas in Luminous Infrared Galaxies
N. Lu, Y. Zhao, C. K. Xu +18
We present our initial results on the CO rotational spectral line energy distribution (SLED) of the to 1 transitions from up to from Herschel SPIRE spectroscop…
ALMA Observations of Warm Molecular Gas and Cold Dust in NGC 34
C. K. Xu, C. Cao, N. Lu +17
We present ALMA Cycle-0 observations of the CO (6-5) line emission (rest-frame frequency = 691.473 GHz) and of the 435 dust continuum emission in the nuclear region of NGC 34,…
Investigation of Dual Active Nuclei, Outflows, Shock-Heated Gas, and Young Star Clusters in Markarian 266
J. M. Mazzarella, K. Iwasawa, T. Vavilkin +24
Results of observations with the Spitzer, Hubble, GALEX, Chandra, and XMM-Newton space telescopes are presented for the Luminous Infrared Galaxy (LIRG) merger Mrk 266. The SW (Seyf…