654 indexed papers · 430 research notes

Research archive

2025-03-04 · 2503.02942v1

Spectroscopic AGN survey at $z$ $\sim$ 2 with NTT/SOFI for GRAVITY+ observations

D. J. D. Santos, T. Shimizu, R. Davies, et al.

NTT/SOFI K-band spectroscopy vets 29 z≈2 type 1 quasars for GRAVITY+, measuring Hα fluxes and Balmer-line shapes to preview BLR kinematics. The Balmer profiles are strongly non-Gaussian with narrow cores plus broad wings, consistent with rotation plus turbulence or a two-zone BLR; two objects show tentative radial-motion dominance. Low FWHM/σ ratios yield small Hα virial factors, cautioning that single-epoch mass scalings can under-estimate MBH for these profiles. Predicted differential-phase signals guide VLTI/GRAVITY+ strategies to secure dynamical BLR masses at cosmic noon.

broad-line AGN QSO broad Balmer spectroscopy

2025-03-03 · 2503.02059v1

A confirmed deficit of hot and cold dust emission in the most luminous Little Red Dots

David J. Setton, Jenny E. Greene, Justin S. Spilker, et al.

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Deep MIRI imaging plus new ALMA continuum and [C II] spectroscopy on two luminous LRDs at z=3.1 (A2744-45924) and z=4.47 (RUBIES-BLAGN-1) set the tightest IR constraints yet. Rest-frame 1–4 μm detections show a flat IR slope, excluding hot (T≳500 K) dust, while far-IR non-detections exclude a cold (T≲75 K) component and typical [C II]-bright dusty starbursts. Empirical maximal SEDs require log(L_IR/L_sun) ≲ 12.2 (3σ), in strong tension with energy-balance predictions from reddened galaxy, AGN, or composite fits. The authors favor intrinsically red LRD SEDs over heavily dust-reddened blue engines, reshaping how these compact sources are interpreted.

LRD ALMA/mm v-shaped SED broad Balmer spectroscopy

2025-03-03 · 2503.01945v1

No [CII] or dust detection in two Little Red Dots at z$_{\rm spec}$ > 7

Mengyuan Xiao, Pascal A. Oesch, Longji Bing, et al.

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Two z_spec > 7 Little Red Dots in FRESCO GOODS-N (ID9094, ID2756) show v‑shape colors, compact morphologies, and broad Hβ (FWHM 2280±490 and 1070±240 km/s), marking them as Type‑I AGN candidates. Deep NOEMA follow-up finds no [CII] 158 μm or 1.3 mm continuum; a DSFG interpretation would have yielded strong detections (>16σ [CII] and >3σ 1.3 mm for ID9094; >5σ [CII] for ID2756). Using the 3σ FIR limits in UV–FIR SED fitting (with/without AGN) and comparison to the L_[CII]–SFR_tot relation, the data favor an AGN contribution, as a dust‑only model would require unusually high dust temperatures. The work shows FIR non‑detections can discriminate AGN‑dominated LRDs from DSFG impostors at z > 7, though a purely dusty origin cannot be fully excluded.

LRD v-shaped SED broad Balmer ALMA/mm spectroscopy high-z

2025-03-02 · 2503.00998v1

Tentative detection of neutral gas in a Little Red Dot at $z=4.46$

Hollis B. Akins, Caitlin M. Casey, John Chisholm, et al.

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ALMA Band 3/4/5 spectroscopy targets CO(7–6) and [CI](2–1) in three Little Red Dots at z=3.10, 4.46, and 7.04, finding no CO and no far-IR continuum, implying conservative molecular gas limits ≲1–5×10^10 Msun. A2744-45924 (z=4.4655) shows a tentative 4.9σ [CI](2–1) line with a narrow FWHM ~80 km s−1. The [CI]-inferred dynamical mass is ≲10^10 Msun for conservative size assumptions, well below the local MBH–Mdyn relation and an order of magnitude under SED-based stellar mass. If confirmed, this points to LRD hosts unlike massive, gas-rich quasar hosts and lends weight to a non-stellar origin for the Balmer break.

LRD ALMA/mm spectroscopy high-z

2025-02-27 · 2502.20550v1

JWST's PEARLS: A z=6 quasar in a train-wreck galaxy merger system

Madeline A. Marshall, Rogier A. Windhorst, Giovanni Ferrami, et al.

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JWST/NIRSpec IFU prism data (0.6–5.3 μm, R≈100) on the z=5.89 quasar NDWFS J1425+3254 capture rest-UV/optical lines and spatially resolve its host environment. Broad Hα and Hβ yield MBH≈1.4×10^9 M⊙ and Lbol/LEdd≈0.3, while [O III] exposes a quasar-driven outflow with v≈6050 km s−1 and an ionized outflow rate ≈1650 M⊙ yr−1. The cube maps a “train-wreck” triple merger: an older, massive NE companion (M⋆≈3.6×10^11 M⊙, age≈65 Myr) linked to the host by a gas bridge, plus a very young SE companion (age≈6.7 Myr, M⋆≈1.9×10^10 M⊙) with ongoing star formation. These results argue for merger-triggered early SMBH growth; a likely foreground z=1.135 galaxy may modestly lens the quasar (1<μ<2; <0.75 mag).

luminous quasar QSO high-z broad Balmer outflows spectroscopy

2025-02-25 · 2502.18310v1

High-velocity outflows in [OIII] emitters at z=2.5-9 from JWST NIRSpec medium-resolution spectroscopy

Ryan A. Cooper, Karina I. Caputi, Edoardo Iani, et al.

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From the full JADES NIRSpec R~1000 sample of 1087 [O III] 5007 emitters at z=2.5–9, the authors flag 40 galaxies with clear blue-side line broadening, of which 34 are robust ionized outflow candidates and 6 may reflect rotating clumps. The outflows occur mostly in star-forming systems (~65% starbursts) spanning log10(M*/Msun)=7.5–11, and include two type-2 AGN candidates plus one little red dot. They measure a median outflow velocity of 531(+146/−159) km/s and a global incidence of 3.4%, higher velocities and lower incidence than prior work, attributed to R1000 resolution and stricter selection. No v_out–M* or SFR correlations are found; v_out/v_esc has a median 0.77 (generally bound), while mass loading anti-correlates with M* up to ~10^10 Msun, exceeding unity in many M*<10^9 Msun galaxies.

outflows spectroscopy high-z demographics

2025-02-18 · 2502.12664v1

Where to search for supermassive binary black holes

Paola Marziani, Edi Bon, Natasa Bon, et al.

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This note argues that the best hunting ground for supermassive binary black holes is a specific, evolved segment of the quasar main sequence—Population B/B1 sources with weak Fe II and broad Balmer lines—where BLR kinematics most clearly betray companions. On a flux-limited sample, the authors decompose Hβ and Mg II with broad/very-broad components and measure centroids at multiple fractional intensities, finding characteristic offsets and asymmetries suggestive of perturbed BLR dynamics. In the M•–L plane, these targets cluster at low Eddington ratios (Population B), reinforcing a focused search strategy. They advocate time-domain spectroscopy to confirm periodic profile changes, cautioning that photometric periodicities alone are vulnerable to red-noise false positives.

broad Balmer QSO variability spectroscopy

2025-02-14 · 2502.10501v1

An X-ray view of the Cataclysmic Variable V902 Mon: Discovery of an X-ray eclipse

Nazma Islam, Koji Mukai

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NuSTAR timing of the eclipsing IP V902 Mon reveals a clear X‑ray eclipse in energy‑resolved lightcurves, phase‑coincident with AAVSO/CV optical minima. Joint NuSTAR+XMM‑Newton spectroscopy requires heavy local absorption (N_H ~1e23 cm^-2) and a strong 6.4 keV Fe Kα line with EW ≈0.7 keV. The authors favor an accretion‑disk‑corona–like, very high‑inclination geometry in which the direct accretion‑column emission is blocked at all phases and we see only scattered/reprocessed X‑rays. This positions V902 Mon as a reflection‑dominated IP where eclipse timing can localize the extended pre‑shock region a few WD radii above the plane.

X-ray spectroscopy low-z

2025-02-14 · 2502.10271v1

The Rich JWST Spectrum of the Western Nucleus of Arp 220: Shocked Hot Core Chemistry Dominates the Inner Disk

Victorine Buiten, Paul van der Werf, Serena Viti, et al.

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JWST MIRI/MRS and NIRSpec/IFU 3–28 μm spectroscopy isolates the western nucleus of Arp 220 and reveals a forest of rovibrational absorptions, enabling column densities and rotational temperatures for 10 species, with optically thick C2H2, HCN, and HNC and columns ≈10× higher than Spitzer. A warm HCN component with Trot ≈ 330 K points to radiative excitation by a hot, ~20 pc inner core veiled by cooler dust. The chemistry resembles hot cores with added shocks, placing the absorbing gas in the inner starburst disk directly encasing the core. No X-ray–driven chemistry or extreme excitation is found, arguing against an energetically dominant buried AGN in this band.

spectroscopy low-z

2025-02-11 · 2502.07875v1

Investigating photometric and spectroscopic variability in the multiply-imaged Little Red Dot A2744-QSO1

Lukas J. Furtak, Amy R. Secunda, Jenny E. Greene, et al.

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Exploiting the three lensed images of the z=7.045 LRD A2744-QSO1 with 22 yr (observer; 2.7 yr rest) delays, the authors test variability using two NIRSpec epochs and multi-epoch NIRCam. Magnification-insensitive EWs of broad Hα and Hβ vary by up to 18±3% and 22±8%, respectively, over 875 d (2.4 yr) in the rest frame, coherently across images. No significant broadband photometric variability is detected beyond ≈0.3 mag systematics, so the EW changes cannot yet be tied to line- versus continuum-driven variability. A DRW model for MBH≈4×10^7 M⊙ matches the sparse sampling, bolstering the AGN interpretation and motivating continued monitoring.

LRD variability broad Balmer broad-line AGN spectroscopy high-z

2025-02-07 · 2502.05048v1

A prevalent population of normal-mass central black holes in high-redshift massive galaxies

Junyao Li, Yue Shen, Ming-Yang Zhuang

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From a galaxy-selected parent sample of 52 massive systems at z≈3–5, the authors use JWST/NIRSpec medium–high resolution spectra to search the Hα+[N II]+[S II] region for broad components (FWHM>1000 km/s), identifying 13 moderate-luminosity BLAGNs. Virial Hα masses and AGN luminosities place these sources on the local M_BH–M_* relation with an average M_BH/M_*≈0.1%, contrasting with previously JWST-selected overmassive LDs and quasars. Back-tracing indicates limited evolution in this mean ratio to z≈6, implying that a prevalent population of “normal” SMBHs was already in place within the first Gyr. Host SEDs show prominent Balmer/4000 Å breaks and red continua, suggesting many of these massive galaxies are already quenching, so assembling massive quiescents need not require overmassive black holes.

broad-line AGN high-z spectroscopy

2025-02-06 · 2502.03684v1

Iron-corrected Single-epoch Black Hole Masses of DESI Quasars at low redshift

Zhiwei Pan, Linhua Jiang, Wei-Jian Guo, et al.

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Using >55,000 type 1 DESI quasars at 0.25<z<0.8, the authors show that Fe emission strength (R_Fe) tracks Eddington ratio and derive iron-corrected R–L relations for Hβ, then calibrate Mg II masses against the Hβ-based results. Relative to canonical single-epoch scalings, black hole masses are overestimated by ~1.5× on average and up to ~5× for super-Eddington objects, which raises the super-Eddington fraction to ~5% (vs. 0.4%). The Mg II relation adds a −0.34 R_Fe term and is applied to build a ~0.5M-quasar DESI catalog at 0.6<z<1.6. If these iron-corrected relations hold at high z, z≥6 quasar masses would drop by a mean factor of ~2.3, easing early SMBH growth tension.

QSO broad-line AGN spectroscopy super-Eddington low-z

2025-01-28 · 2501.16648v1

Three Brown Dwarfs Masquerading as High-Redshift Galaxies in JWST Observations

Zhijun Tu, Shu Wang, Xiaodian Chen, et al.

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From RUBIES NIRSpec PRISM/CLEAR (0.6–5.3 μm) spectra, the authors confirm three compact RUBIES sources (o005_s41280, o006_s00089, o006_s35616) are brown dwarfs rather than distant galaxies. Sonora Elf Owl fits yield Teff ≈2100–2300 K and 1800–2000 K for the two L-dwarf candidates and <1000 K for the late‑T object, with distances around 2 kpc; adding an extinction term notably improves Y/J/H residuals, especially for o006_s35616. NIRCam color–color planes place the cool T dwarf within the little red dot locus while the hotter L dwarfs sit among high‑z galaxy selections, implying ≈0.1% brown‑dwarf contamination in deep extragalactic surveys dominated by L dwarfs. The work pins down how specific substellar SED shapes infiltrate LRD/high‑z samples and shows that low‑resolution prism spectra efficiently weed them out.

LRD spectroscopy

2025-01-23 · 2501.14072v1

Estimating Black Hole Masses in Obscured AGN from X-ray and Optical Emission Line Luminosities

S. LaMassa, I. Farrow, C. M. Urry, et al.

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Tests a proxy-based black hole mass estimator for obscured AGN that infers FWHM_bHα from the narrow-line ratio L[O III]/L_nHβ and λL5100 from either intrinsic 2–10 keV X-rays or narrow lines, using 99 local Swift-BAT/BASS AGN. The two λL5100 proxies differ by a mean −0.32 ± 0.68 dex (narrow-line estimate lower than X-ray), implying ≈2× MBH uncertainty from the luminosity choice. Compared to virial masses from broad Paschen lines (14 Paα, 12 Paβ), the proxy MBH is higher by 0.39 ± 0.44 dex and 0.48 ± 0.51 dex, respectively, though still within the scatter. σ*-based MBH for 151 BASS AGN agrees on average within 0.08 dex but with large ≈0.74 dex scatter, so the method scales to large samples with overall ≈3–5× uncertainty and a possible mild high bias needing more data.

obscured AGN X-ray spectroscopy low-z

2025-01-23 · 2501.14026v1

Luminous Mid-IR Selected Type-2 Quasars at Cosmic Noon in SDSS Stripe82 I: Selection, Composite Photometry, and Spectral Energy Distributions

Ben Wang, Joseph F. Hennawi, Zheng Cai, et al.

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WISE W4>5 mJy selection in SDSS Stripe 82 yielded 24 candidates, with GNIRS (all) plus LRIS (18/24) confirming 23 luminous Type‑2 QSOs at 0.88<z<2.99, including 12 at z>2. Multi‑band photometry (DESI Legacy, PS1, UKIDSS, Spitzer, WISE) enables rest‑frame 0.1–10 μm composite photometry and AGNfitter SEDs. The IR is torus‑dominated with average L_torus ≈10^46.84 erg s−1; inferred L_bol spans 10^46.28–10^47.49 erg s−1 and Eddington masses ~10^8.18–10^9.39 M⊙, and the sample is redder with brighter tori than earlier Type‑2 SEDs. Their SED shapes closely resemble JWST “little red dots,” highlighting mid‑IR selection as an efficient path to luminous z>2 Type‑2s; a key open point is the origin of the rest‑UV/optical light (scattered, stellar, or a reddened disk).

obscured AGN QSO luminous quasar spectroscopy high-z

2025-01-22 · 2501.13082v1

BlackTHUNDER -- A non-stellar Balmer break in a black hole-dominated little red dot at $z=7.04$

Xihan Ji, Roberto Maiolino, Hannah Übler, et al.

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BlackTHUNDER analyzes JWST NIRSpec-IFU plus archival MSA data of the triply imaged lensed LRD Abell2744-QSO1 at z=7.04, confirming a smooth Balmer break and a broad Hβ from the BLR. The narrow Hβ dispersion gives M_dyn < 4×10^8 Msun, capping the stellar contribution to <10% of the optical continuum and favoring a non-stellar Balmer break produced by an AGN continuum filtered by very dense (n_H ~ 10^10 cm^-3), nearly dust-free gas likely in/around the BLR; a tentative 3σ Hβ absorption appears in the R2700 spectrum. The black hole is overmassive relative to both stellar and dynamical masses, with hints of variability and an initial reverberation-mapping attempt. This picture alleviates the extreme stellar-density problem for LRDs and may generalize to similar V-shaped continua.

LRD v-shaped SED broad Balmer overmassive BH spectroscopy high-z

2025-01-22 · 2501.12567v1

Exploring quasar evolution with proximate molecular absorbers: Insights from the kinematics of highly ionized nitrogen

R. Cuellar, P. Noterdaeme, S. Balashev, et al.

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X-shooter spectroscopy of 13 z≈2.5–3.3 quasars with proximate H2+HI absorbers finds NV in 9/13 (70%), far exceeding intervening DLA (~10%) and generic proximate (~30%) rates. High-ionization lines show blue-extended, broader kinematics decoupled from the neutral/low-ionized profiles, and NV/SiIV varies with velocity such that blueshifted components require higher ionization parameters. Redshifted systems lack NV and are interpreted as infall pre-feedback, while blueshifted proximate H2 systems trace outflow phases that can reach neutral/molecular gas. The authors argue that ionization state—not a fixed velocity threshold—should define “associated” versus “intervening” classifications.

QSO outflows spectroscopy high-z

2025-01-17 · 2501.10574v1

A Large Systematic Search for Close Supermassive Binary and Rapidly Recoiling Black Holes -- IV. Ultraviolet spectroscopy

Jessie C. Runnoe, Michael Eracleous, Tamara Bogdanović, et al.

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HST UV spectra (COS/STIS) for 13 z<0.7 quasars with large H-beta velocity offsets are compared to contemporaneous optical Balmer profiles to test supermassive black hole binary (SBHB) versus single-BH disk-like BLR scenarios. The authors isolate broad components and ask whether UV resonance lines (e.g., Lyα, C IV) share the same velocity offset as Balmer lines set by [O III]. They find three objects with strong SBHB support, five tentative, one disfavored, and four inconclusive due to severely absorbed UV profiles. This cross-wavelength line-profile test tightens SBHB vetting by demanding consistent Doppler shifts across independent broad lines.

QSO broad-line AGN broad Balmer spectroscopy low-z

2025-01-16 · 2501.09585v1

New Methods of Identifying AGN in the Early Universe using Spectroscopy and Photometry in the JWST Era

Flor Arevalo Gonzalez, Titanilla Braun, James Trussler, et al.

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This paper stress-tests UV-line diagnostics and NIRCam SED selection to find early AGN, showing that classic optical BPT/VO87 fail in low-metallicity regimes. Using photoionization grids, the most effective discriminants emerge as (CIII]+CIV)/HeII λ1640, CIII]/HeII λ1640, and the EW of HeII λ1640, with HeII λ1640/Hβ also separating AGN from star-formers when dust is low. Applied to three JADES/NIRSpec sources (IDs 9422, 18846, 10058975), the diagnostics are promising but current spectra blend HeII λ1640 with OIII] λλ1661,1666 and optical lines are unreliable, limiting firm AGN claims. An EAZY-based NIRCam SED search flags one strong candidate with strong UV emission, and the authors argue longer integrations—especially at z>6—are needed to cleanly deblend key lines.

JWST AGN spectroscopy high-z demographics

2025-01-07 · 2501.04085v1

The Cosmic Evolution Early Release Science Survey (CEERS)

Steven L. Finkelstein, Micaela B. Bagley, Pablo Arrabal Haro, et al.

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CEERS is a 77.2 hr ERS survey in the EGS that uses coordinated, overlapping NIRCam/MIRI imaging, NIRSpec low–medium resolution spectroscopy, and NIRCam slitless grism data to validate efficient extragalactic mapping. From ~90 arcmin^2 of NIRCam imaging it uncovered large samples of z ≳ 10 galaxies and secured >1000 spectra, including dozens at 6<z<10, enabling redshifts and rest‑optical line diagnostics that probe star formation and supermassive black hole growth. The program also quantifies the first bulge, bar, and disk structures at z>3 and leverages MIRI mid‑IR emission to trace dust‑obscured star formation and black‑hole accretion at z~1–3. As a legacy, CEERS releases processed data with detailed reduction notes and reproducible notebooks.

spectroscopy high-z demographics