Very Large Telescope and [ITAL]Hubble Space Telescope[/ITAL] Observations of the Host Galaxy of GRB 990705

2002 ◽  
Vol 581 (2) ◽  
pp. L81-L84 ◽  
Author(s):  
E. Le Floc’h ◽  
P.-A. Duc ◽  
I. F. Mirabel ◽  
D. B. Sanders ◽  
G. Bosch ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Host Galaxy ◽  
Large Telescope ◽  
Space Telescope ◽  
Very Large Telescope

ALMA detection of the [OIII] 88 μm line in a highly-magnified Lyman break galaxy at z = 6.1

2019 ◽  
Vol 15 (S341) ◽  
pp. 309-311
Author(s):  
Kaho Sunaga ◽  
Yoichi Tamura ◽  
Minju Lee ◽  
Ken Mawatari ◽  
Akio K. Inoue ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Rest Frame ◽  
Hubble Space Telescope ◽  
Continuum Emission ◽  
Large Telescope ◽  
Space Telescope ◽  
Model Combining ◽  
Very Large Telescope ◽  
Stellar Component ◽  
Two Component

AbstractWe present a 4.7σ detection of the [OIII] 88 μm line in a gravitationally-lensed Lyman break galaxy, RXC J2248-ID3, using the Atacama Large Millimeter/submillimeter Array (ALMA). We did not detect [CII] 158 μm and rest-frame 90 μm dust continuum emission, suggesting that the bulk of the interstellar medium (ISM) is ionized. Our two-component SED model combining the previous Hubble Space Telescope (HST) data and new photometry obtained from Very Large Telescope (VLT), Spitzer and ALMA suggests the presence of young (∼2 Myr) and mature (∼600 Myr) stellar components with the metallicity of Z = 0.2Z⊙. Our findings are in contrast with previous results claiming a very young, metal-poor stellar component.

scholarly journals On The Compatibility of Ground-based and Space-based Data: WASP-96 b, An Example

2020 ◽  
Author(s):  
Kai Hou Yip ◽  
Quentin Changeat ◽  
Billy Edwards ◽  
Mario Morvan ◽  
Katy Chubb ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
The Other ◽  
Additional Parameter ◽  
Transmission Spectra ◽  
Next Generation ◽  
Large Telescope ◽  
Space Telescope ◽  
Very Large Telescope ◽  
In Transit ◽  
Risky Business

<p>The study of exoplanetary atmosphere relies on detecting minute changes in the transit depth at different wavelengths. To date, a number of ground and space based instruments have been used to obtain transmission spectra of exoplanets in different waveband. One common practice is to combine observations from different instruments in order to achieve a broader wavelength coverage. We present here two inconsistent observations on WASP-96 b, one by Hubble Space Telescope (HST) and the other by Very Large Telescope (VLT). We present two key findings in our investigation: 1.) a strong water signature is detected via the HST WFC3 observations. 2.) A notable offset in transit depth (>1100 ppm) can be seen when the ground-based and space-based observations are combined together. The discrepancy raises the question of whether observations from different instruments could indeed be combined together. We attempt to align the observations by including an additional parameter in our retrieval studies but are unable to definitively ascertain that the aligned observations are indeed compatible. The case of WASP-96 b signals that compatibility of instruments should not be assumed. While wavelength overlaps between instruments can help, it should be noted that combining datasets remains a risky business. The difficulty in combining observations also strengthens the need for next generation instruments which will possess broader spectral coverage.</p>

scholarly journals Leveraging HST with MUSE – I. Sodium abundance variations within the 2-Gyr-old cluster NGC 1978

2020 ◽  
Vol 498 (3) ◽  
pp. 4472-4480
Author(s):  
S Saracino ◽  
S Kamann ◽  
C Usher ◽  
N Bastian ◽  
S Martocchia ◽  
...  
Keyword(s):  
Globular Clusters ◽  
Hubble Space Telescope ◽  
Large Magellanic Cloud ◽  
Host Galaxy ◽  
Very Large Telescope ◽  
Nearby Galaxies ◽  
Red Giant ◽  
Sodium Abundance ◽  
Massive Clusters ◽  
Cluster Age

ABSTRACT Nearly all of the well-studied ancient globular clusters (GCs), in the Milky Way and in nearby galaxies, show star-to-star variations in specific elements (e.g. He, C, N, O, Na, and Al), known as ‘multiple populations’ (MPs). However, MPs are not restricted to ancient clusters, with massive clusters down to ∼2 Gyr showing signs of chemical variations. This suggests that young and old clusters share the same formation mechanism but most of the work to date on younger clusters has focused on N variations. Initial studies even suggested that younger clusters may not host spreads in other elements beyond N (e.g. Na), calling into question whether these abundance variations share the same origin as in the older GCs. In this work, we combine Hubble Space Telescope (HST) photometry with Very Large Telescope (VLT)/Multi-Unit Spectroscopic Explorer (MUSE) spectroscopy of a large sample of red giant branch (RGB) stars (338) in the Large Magellanic Cloud cluster NGC 1978, the youngest globular to date with reported MPs in the form of N spreads. By combining the spectra of individual RGB stars into N-normal and N-enhanced samples, based on the ‘chromosome map’ derived from HST, we search for mean abundance variations. Based on the NaD line, we find a Na difference of Δ[Na/Fe] = 0.07 ± 0.01 between the populations. While this difference is smaller than typically found in ancient GCs (which may suggest a correlation with age), this result further confirms that the MP phenomenon is the same, regardless of cluster age and host galaxy. As such, these young clusters offer some of the strictest tests for theories on the origin of MPs.

scholarly journals Inspecting the Cepheid Distance Ladder: the Hubble Space Telescope Distance to the SN Ia Host Galaxy NGC 5584

2021 ◽  
Vol 911 (1) ◽  
pp. 12
Author(s):  
Behnam Javanmardi ◽  
Antoine Mérand ◽  
Pierre Kervella ◽  
Louise Breuval ◽  
Alexandre Gallenne ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Host Galaxy ◽  
Space Telescope

scholarly journals [ITAL]Hubble Space Telescope[/ITAL] Space Telescope Imaging Spectrograph Imaging of the Host Galaxy of GRB 980425/SN 1998[CLC]bw[/CLC]

2000 ◽  
Vol 542 (2) ◽  
pp. L89-L93 ◽  
Author(s):  
J. U. Fynbo ◽  
S. Holland ◽  
M. I. Andersen ◽  
B. Thomsen ◽  
J. Hjorth ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Host Galaxy ◽  
Space Telescope ◽  
Imaging Spectrograph

scholarly journals White dwarf pollution by hydrated planetary remnants: hydrogen and metals in WD J204713.76–125908.9

2020 ◽  
Vol 499 (1) ◽  
pp. 171-182
Author(s):  
Matthew J Hoskin ◽  
Odette Toloza ◽  
Boris T Gänsicke ◽  
Roberto Raddi ◽  
Detlev Koester ◽  
...  
Keyword(s):  
Water Mass ◽  
Hubble Space Telescope ◽  
Parent Body ◽  
Absorption Lines ◽  
Carbonaceous Chondrites ◽  
Large Telescope ◽  
Volatile Elements ◽  
Very Large Telescope ◽  
Far Ultraviolet ◽  
Cosmic Origin

ABSTRACT WD J204713.76–125908.9 is a new addition to the small class of white dwarfs with helium-dominated photospheres that exhibit strong Balmer absorption lines and atmospheric metal pollution. The exceptional abundances of hydrogen observed in these stars may be the result of accretion of water-rich rocky bodies. We obtained far-ultraviolet and optical spectroscopy of WD J204713.76–125908.9 using the Cosmic Origin Spectrograph on-board the Hubble Space Telescope and X-shooter on the Very Large Telescope, and identify photospheric absorption lines of nine metals: C, O, Mg, Si, P, S, Ca, Fe, and Ni. The abundance ratios are consistent with the steady-state accretion of exo-planetesimal debris rich in the volatile elements carbon and oxygen, and the transitional element sulphur, by factors of 17, 2, and 4, respectively, compared to the bulk Earth. The parent body has a composition akin to Solar system carbonaceous chondrites, and the inferred minimum mass, 1.6 × 1020 g, is comparable to an asteroid 23 km in radius. We model the composition of the disrupted parent body, finding from our simulations a median water mass fraction of 8 per cent.

scholarly journals Chandra and Hubble Space Telescope observations of dark gamma-ray bursts and their host galaxies

2019 ◽  
Vol 486 (3) ◽  
pp. 3105-3117 ◽  
Author(s):  
A A Chrimes ◽  
A J Levan ◽  
E R Stanway ◽  
J D Lyman ◽  
A S Fruchter ◽  
...  
Keyword(s):  
Morphological Analysis ◽  
Gamma Ray ◽  
Hubble Space Telescope ◽  
High Redshift ◽  
Host Population ◽  
Host Galaxy ◽  
Host Galaxies ◽  
Space Telescope ◽  
X Ray ◽  
Dust Component

Abstract We present a study of 21 dark gamma-ray burst (GRB) host galaxies, predominantly using X-ray afterglows obtained with the Chandra X-Ray Observatory (CXO) to precisely locate the burst in deep Hubble Space Telescope (HST) imaging of the burst region. The host galaxies are well-detected in F160W in all but one case and in F606W imaging in 60 per cent of cases. We measure magnitudes and perform a morphological analysis of each galaxy. The asymmetry, concentration, and ellipticity of the dark burst hosts are compared against the host galaxies of optically bright GRBs. In agreement with other studies, we find that dark GRB hosts are redder and more luminous than the bulk of the GRB host population. The distribution of projected spatial offsets for dark GRBs from their host galaxy centroids is comparable to that of optically bright bursts. The dark GRB hosts are physically larger, more massive and redder, but are morphologically similar to the hosts of bright GRBs in terms of concentration and asymmetry. Our analysis constrains the fraction of high redshift (z > 5) GRBs in the sample to 14 per cent, implying an upper limit for the whole long-GRB population of ≤4.4 per cent. If dust is the primary cause of afterglow darkening amongst dark GRBs, the measured extinction may require a clumpy dust component in order to explain the observed offset and ellipticity distributions.

scholarly journals Hubble Space Telescope observations of the BL Lac object PKS Formula: the host galaxy revealed

1994 ◽  
Vol 268 (3) ◽  
pp. 681-689 ◽  
Author(s):  
I. M. McHardy ◽  
M. R. Merrifield ◽  
R. G. Abraham ◽  
C. S. Crawford
Keyword(s):  
Hubble Space Telescope ◽  
Host Galaxy ◽  
Space Telescope ◽  
Bl Lac

scholarly journals Nuclear Disks Embedded in Elliptical Galaxies

1996 ◽  
Vol 171 ◽  
pp. 458-458
Author(s):  
Frank C. van den Bosch ◽  
Tim de Zeeuw
Keyword(s):  
Hubble Space Telescope ◽  
Mass Density ◽  
Elliptical Galaxies ◽  
Velocity Profiles ◽  
Host Galaxy ◽  
Ionized Gas ◽  
Central Mass ◽  
Space Telescope

The Hubble Space Telescope has discovered a number of ellipticals and S0's with small nuclear, stellar disks (eg. van den Bosch et al. 1994, AJ, 108, 1579). The kinematics of these disks may allow a derivation of the central mass density of the host galaxy, in much the same way as is possible with ionized gas disks (e.g. M87; Harms et al. 1994, ApJ, 435, L35). In order to understand the kinematic signatures of these disks, we have constructed two-integral, axisymmetric models of ellipticals with nuclear stellar disks. We use the method developed by Hunter & Qian (1993, MNRAS, 262, 401) to calculate f(E, Lz), from which we derive the velocity profiles (VPs). Depending on the choice of the odd part of the DF, one can construct a large variety of models including some with counter-rotating cores.

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